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High-strength aluminum alloy for additive manufacturing and preparation method of high-strength aluminum alloy powder
ActiveCN109280820AGuaranteed yieldAvoid oxidation burnAdditive manufacturing apparatusTransportation and packagingTest sampleMedium frequency
The invention provides a high-strength aluminum alloy for additive manufacturing and a preparation method of high-strength aluminum alloy powder. The high-strength aluminum alloy powder is prepared byadopting a gas atomization process. The preparation method comprises the following steps of: firstly, melting an Al-Si-Zn-Cu-Mg-X alloy prefabricated ingot by adopting a medium frequency induction furnace, then powdering by adopting a supersonic speed gas atomization process, sieving and preparing powder of different specifications for additive manufacturing. A test sample obtained by adopting the high-strength aluminum alloy powder through additive manufacturing has compact texture without crack defects, the strength of extension exceeding 500MPa and the elongation exceeding 3%; the strengthperformance of the test sample is obviously superior to the strength performance of additive manufacturing test samples of AlSi10Mg, AlSi7Mg and AlSi12; and the performances of the test sample are also superior to the performances of additive manufacturing test samples of conventional 2000 series and 7000 series alloys. The alloy powder can be used for preparing aluminum alloy parts with compacttexture, complicated shapes and high strength in an additive manufacturing method to meet the requirements of use occasions on high specific strength and complicated shapes in the fields of aviation,spaceflight and automobiles.
Owner:AVIC BEIJING INST OF AERONAUTICAL MATERIALS
Novel positive sequence impedance differential protection method of microgrid
ActiveCN105811383ALarge positive sequence impedance differential protectionImprove reliabilityEmergency protective arrangements for automatic disconnectionElectrical resistance and conductanceMicrogrid
The invention discloses a novel positive sequence impedance differential protection method of a microgrid. The method comprises the following steps of acquiring a three-phase current and a three-phase voltage in real time, and further calculating positive sequence impedance at a protection installation position; carrying out calculation of action impedance and braking impedance; judging whether a differential protection region is a fault section or not by a local-side protection device after receiving positive sequence impedance information of an opposite side of the differential protection region through a communication network; and additionally arranging a phase-comparison distance component in a detection blind region subjected to the positive sequence impedance differential protection for identifying a three-phase metal fault. The method can be suitably used for two running states of grid connection and island of the microgrid, the influence of through current and large transition resistance on fault detection during a fault is fully considered, moreover, the method is implemented without the assistance of synchronous signal acquisition and a fault component, the complicated network structure of the microgrid and the problem brought to microgrid protection by variable running states are effectively solved, and the protection selectivity and reliability are ensured.
Owner:ZAOZHUANG POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +2
High temperature resistant radar and infrared compatible camouflage material and preparation method thereof
The invention discloses a high temperature resistant radar and infrared compatible camouflage material with a layered structure. The material from the inside to the outside is mainly composed of a silicon carbide composite layer, an anti-oxidation modification layer, a metal frequency selective surface layer, wherein the anti-oxidation modification layer is a cordierite glass coating; the metal frequency selective surface layer is mainly composed of a high temperature resistant and oxidation resistant metal coating with periodic patterns. The preparation method comprises the steps of: preparing a silicon carbide composite layer by using a precursor infiltration and pyrolysis process; then evenly coating the silicon carbide composite layer surface with cordierite glass slurry by a brushing process; preparing an anti-oxidation modification layer on the surface of the silicon carbide composite material; preparing a metal coating on the anti-oxidation modification layer by a physical deposition process; and finally etching the metal coating into a frequency selective surface by a laser etching process, so as to complete the preparation of the radar and infrared compatible camouflage material. The high temperature resistant radar and infrared compatible camouflage material can withstand high temperature of above 1000 DEG C.
Owner:NAT UNIV OF DEFENSE TECH
Preparation method for cellulose modification nano iron particles
ActiveCN104785793AFacilitate adaptation to in situ and heterotopic repairSimple processWater/sewage treatmentCelluloseNitrate salts
The invention discloses a preparation method for cellulose modification nano iron particles. According to the preparation method, two kinds of environment-friendly non-poisonous and innocuous cellulose are taken as dispersing agents to conduct surface modification on particles in the preparation process of the nano iron particles, and the cellulose dispersing agent modified nano iron particles are obtained. According to the preparation method for the cellulose modification nano iron particles, the process is simple and convenient, the operation is easy, the cost is low, the dispersity of the nano iron particles is good, the agglomeration of the particles in water can be reduced, and the removal efficiency of the particles to organic pollutants, dyestuff, pesticides, nitrate and heavy metal is improved.
Owner:KUNMING UNIV OF SCI & TECH
Single-sided welding copper liner device with water cooling and back protection and corresponding welding method
ActiveCN109865966ACompact structureReduce weightWelding/cutting auxillary devicesAuxillary welding devicesWeld seamElectric arc
The invention belongs to the technical field of welding, and particularly relates to a single-sided welding copper liner device with water cooling and back protection and a corresponding welding method. By circulating cooling water and shielding gas inside a copper liner, the good welding forming effect of workpieces to be welded is ensured, many beneficial effects of reducing welding deformation,prolonging the service life of the liner, preventing oxidation inclusion on the back of a weld seam, refining weld seam grains, improving the tensile strength of the weld seam and the like are realized, and the single-sided welding copper liner device is suitable for various electric-arc welding methods.
Owner:WUHAN UNIV OF TECH +1
Composite additive improving self-contraction of concrete
InactiveCN101172803ALow costReduce autogenous shrinkageSolid waste managementDimethyl siloxaneRelative humidity
The invention relates to a compound admixture for improving the self-contraction property of concrete, and belongs to the technical field of the admixture. The prior materials used for improving the self-contraction of the concrete mainly comprise expansion agent, shrinkage reducing agent and fiber, but the materials are not effective when the materials are used solely. The invention is characterized in that the compound admixture is formed by evenly mixing I-class fly ash, milled limestone powder, dihydrate gypsum, raw alum clay and dimethyl siloxane, wherein, the weight percent of each component is showed as follows: 20 to 40 percent of the I-class fly ash, 30 to 60 percent of the milled limestone powder, 5 to 10 percent of the dihydrate gypsum, 10 to 20 percent of the raw alum clay and 3 to 5 percent of the dimethyl siloxane; the finenesses of the milled limestone powder, the dihydrate gypsum and the raw alum clay are larger than 350m2 / kg. When the invention is mixed into the concrete with high strength and large area and the self-compacting concrete, and the relative ambient humidity is less than 50 percent, the invention can obviously reduce the self contraction rate of the concrete by more than 30 percent and improve the strength, the mobility and the durability of the concrete.
Owner:BEIJING UNIV OF TECH
Device for performing heat treatment correction on titanium alloy spoke structure welded case
ActiveCN103555915ASolve the problem of moving upMeet heat treatment correction requirementsWork holdersFurnace typesTitanium alloyHeat treated
The invention relates to a device for performing heat treatment correction on a titanium alloy spoke structure welded case. According to the technical scheme, the device for performing heat treatment correction on the titanium alloy spoke structure welded case comprises a base, a central spindle, an inner cover, a limiting sleeve, a gland and a wedge block. The invention aims to perform heat treatment correction on the titanium alloy spoke structure welded case by utilizing the bulging force and gravity of the device, a supporting plate is limited to shrink to drive an inner case to move up during the heat treatment correction, and the titanium alloy spoke structure welded case is enabled to meet the requirement of design paper through one-step heat treatment correction.
Owner:SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
Device and method for improving linear polarization output power of neodymium:yttrium aluminum garnet (Nd:YAG) laser
InactiveCN102244341AReduced thermal depolarization effectAvoid lossActive medium shape and constructionAll solid stateNd:YAG laser
The invention relates to a device and a method for improving the linear polarization output power of a rod-like neodymium:yttrium aluminum garnet (Nd:YAG) laser. In the method, compared with a conventional Nd:YAG crystal rod cut in a direction [111], the Nd:YAG crystal rod cut in the direction [100] by a lateral pump of a semiconductor laser improves the output energy of linearly polarized light in fit with a proper linear polarization direction. The method provided by the invention can be widely used for the all-solid state rod-like Nd:YAG laser; and the all-solid state rod-like Nd:YAG laser can be ensured to have the characteristics of high linearly polarized light power, low thermally induced depolarization loss, operational simplicity and the like, and is easy to apply to engineering.
Owner:BEIJING UNIV OF TECH
Non-contact arc ignition welding gun for vacuum electric arc welding of hollow cathode
ActiveCN101658971ASolution to short lifeStable jobElectrode supporting devicesControl systemCooling effect
The invention belongs to welding technology and relates to a non-contact arc ignition welding gun capable of realizing stable arc ignition and used for vacuum electric arc welding of a hollow cathode.A hollow cathode of the welding gun is directly inserted into central holes of an outer barrel support and an inner barrel support; an outer barrel component of the welding gun comprises an outer barrel water inlet pipe, an outer barrel water outlet pipe, an outer barrel connecting terminal, a hollow barrel wall and an outer base plate; an inner barrel component of the welding gun comprises an air inlet pipe, an inner barrel connecting terminal, an inner barrel water inlet pipe, an inner barrel water outlet pipe, a barrel wall and an inner base plate; the outer barrel component and the innerbarrel component of the welding gun are separated through an insulating bush; and an arc ignition auxiliary circuit is accessed between the outer barrel connecting terminal and the inner barrel connecting terminal. The hollow cathode is arranged in a closed system between the outer barrel and the inner barrel of the welding gun, thereby preventing the hollow cathode from being polluted by metal vapor due to exposing in electric arc; and the welding gun adopts a bi-channel water cooling system, therefore, the cooling effect is good, the working reliability of the electric arc is high, the service life of the welding gun and the hollow cathode is long, and the stable work of the welding control system is ensured.
Owner:BEIJING AERONAUTICAL MFG TECH RES INST
Method for preparing short-chain fatty acid vinyl ester series cement dispersant
The invention relates to a method for preparing a short-chain fatty acid vinyl ester series cement dispersant. Short-chain fatty acid vinyl ester is used as a copolymerization monomer for preparing the cement dispersant material, namely the method comprises the following steps of: performing ternary polymerization by using the short-chain fatty acid vinyl ester, an unsaturated easily-dehydrated compound and an unsaturated sulfonic acid (sulfonate) compound as monomers, performing full alcoholysis and hydrolysis on the polymerization product, performing condensation reaction on the hydrolyzed product and a methoxy polyoxyethylene ether compound under the action of a catalyst, and thus obtaining the cement dispersant. The invention has the advantages of strong process controllability, high structural activity, energy conservation and environment friendliness; the main chain of molecules carries various strong adsorption groups by the polymerization reaction, the water holding property of the alcoholysis product of the short-chain fatty acid vinyl ester is fully exerted, and hydrophilic side chains are grafted to the main chain by the condensation reaction to form the cement dispersant with the novel structure; and the granule dispersibility, the flowability and the age holding capacity of cement slurry are fully improved, the workability of cement is improved, and the cement dispersant shows excellent cement adaptability.
Owner:XINYANG LINGSHI TECH CO LTD
Method and device for promoting output characteristics of Nd:YAG laser device
InactiveCN107017545AIncrease output powerHigh beam qualityActive medium materialLaser cooling arrangementsLight beamOptoelectronics
The invention discloses a method and a device for promoting output characteristics of a Nd:YAG laser device and belongs to the field of laser device manufacturing. The device comprises a trapezoid lath laser gain medium, a pumping source, a total reflective mirror, a cylindrical mirror, a diaphragm and an output lens; a Nd:YAG crystal lath bonded with sapphire is arranged as the trapezoid lath laser gain medium; a bonding technique of different materials is utilized to reduce the heat effect of a heat lath laser device and promote the output power and the light beam quality. The excellent heat conduction of the sapphire is utilized to realize the laser output in high output power and high light beam quality in the free oscillation running process of the grazing incidence lath laser device.
Owner:BEIJING UNIV OF TECH
Manufacturing method for serrated aperture with random radius
InactiveCN102540287AReduce modulation strengthEasy to operateOptical elementsComputer Aided DesignLight beam
The invention relates to a manufacturing method for a serrated aperture with random radius and belongs to the field of laser. The method comprises the following steps of: generating a parameter, namely r=a*(1+a1*rand(theta)), of the serrated diaphragm with the radius randomly changed along with the increment of the angle, wherein a is average radius and equal to 0.002 m, a1 is modulation depth and equal to 0.05, and rand (theta) is a function randomly changed along with the change of the angle and equal to -1 to 1; and importing the parameter into computer-aided design (CAD) and cutting the corresponding aperture by a laser cutting method. Compared with the traditional amplitude modulation ripple serrated aperture, the serrated aperture with the radius randomly changed along with the change of angle is used together with a space filter, so that the radial beam filling factor is improved and the modulation intensity is reduced. The method can be widely applied to beam shaping and light intensity homogenization of a laser, ensures the high filling factor of the laser, and remarkably improves the utilization ratio, stability and output power of the energy storage substances of the laser.
Owner:BEIJING UNIV OF TECH
High-strength heat-resistant magnesium alloy containing Ag and preparation method thereof
ActiveCN108624793AImprove mechanical properties at room temperatureHigh tensile strengthRare-earth elementHeat resistance
The invention provides high-strength heat-resistant magnesium alloy containing Ag. The high-strength heat-resistant magnesium alloy comprises the following components in percentage by weight: 4.5-6.5percent of Y, 1.5-4.0 percent of Nd, 1.5-4.0 percent of Gd, 0.1-1.5 percent of Ag, 0.15-1.5 percent of Zr and the balance of Mg, wherein the total amount of the rare earth elements does not exceed 10percent by weight. The high-strength heat-resistant magnesium alloy comprises the following components: Mg-Y-Nd-Gd-Ag-Zr; a precipitate containing a rare earth inter-metallic compound is strengthenedas a main strengthening mechanism; a RE-Ag fine high temperature stable phase and an Mg-RE-Ag eutectic are formed through adding the Ag as a non-rare earth element; the newly-formed phase has the characteristics of fine dispersion and high temperature stability; the heat treatment age hardening effect and the heat resistance of the high-strength heat-resistant magnesium alloy are significantly improved. The invention further provides a preparation method of the high-strength heat-resistant magnesium alloy containing the Ag.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and preparation method thereof
The invention provides a rare earth magnesium alloy. The rare earth magnesium alloy is a modified Mg-Gd-Y-Zr series rare earth magnesium alloy. The as-cast metallographic structure of the rare earth magnesium alloy is provided with an Mg5Gd phase with a round edge; and or the extruded metallographic structure of the rare earth magnesium alloy has a small granular precipitated phase, and the radial size of the granules is 10-150 nm. The microstructure morphology of the alloy is improved through a multi-element microalloying method, the microstructure morphology of the alloy material is improved by adding trace Ag and Sc in a specific proportion, the age hardening and grain refinement effects are improved, and then excellent room-temperature and high-temperature mechanical properties are obtained. On the premise that the total amount of rare earth is not increased, the strength performance index is high, good plasticity is reserved, engineering application is easy to achieve, and the requirements of the current fields of aerospace, missile military industry, rail transit and the like for the mechanical property of a light structural material under the room-temperature and high-temperature environment can be met.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Expansion device and processing method for facing of large-size medium-thickness cylindrical part
ActiveCN104353857ASolve self-importanceSolve rigid problemsExpansion mandrelsHydraulic cylinderEngineering
The invention relates to an expansion device and a processing method for facing of a large-size medium-thickness cylindrical part. The expansion device adopts the technical scheme that the expansion device comprises a base, a guide plate, an expansion block, a guide seat, an expansion jacking head, a conical head, a support plate, a guide column b, a loosening jacking head, a single-action hydraulic oil cylinder, a manual hydraulic cylinder and a high pressure hydraulic oil pipe, wherein the base is formed by welding an upper support plate, a lower support plate and support columns, the support columns are uniformly distributed along the circumference, the guide seat is fixedly arranged on the upper support plate of the base through a bolt, the guide seat is provided with an inner cavity, the guide column b is fixedly arranged on the lower support plate of the base through a bolt, and the guide seat, the guide column b and the base are coaxially arranged. By adopting the technical scheme, the expansion device has the advantages that the problems of large self weight, higher rigidity, and unreliable manual expansion of traditional thread in the large-size medium-thickness cylindrical part are solved; the manufacturing is simple, the time is shortened, the labor is saved, the fund is reduced, the implementation is easy, and the working efficiency is improved.
Owner:SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
Method for testing interlayer I-type fracture toughness of composite material without tracking cracks
ActiveCN110470534AReduce workloadReduce testing costsMaterial strength using tensile/compressive forcesSpecial data processing applicationsGlass fiberCurrent load
The invention belongs to the technical field of composite material mechanical property testing. The invention relates to a method for testing interlayer I-type fracture toughness of a composite material without tracking cracks. According to the test method, based on a correction beam theory of I-type interlayer fracture toughness calculation, a layering length expression and a fracture toughness expression about the real-time flexibility of a DCB test piece are established by utilizing an internal mechanical relationship between a layering length and the flexibility of the DCB test piece; theproblems that interlayer cracks need to be tracked in a layering test and the layering length under the current load needs to be recorded in real time are solved; the method is suitable for testing the I-type interlayer fracture toughness of the continuous fiber reinforced polymer matrix composite laminate, the operation process is simple, and engineering application is convenient to achieved; andmoreover, the method is particularly suitable for continuous fiber reinforced polymer matrix composite laminates, such as continuous fiber reinforced polymer matrix composites of carbon fibers, glassfibers, aramid fibers and the like.
Owner:AVIC BEIJING INST OF AERONAUTICAL MATERIALS
Co-curing forming method for T-shaped stiffened wallboard composite material
The invention discloses a co-curing forming method for a T-shaped stiffened wallboard composite material. According to the method, an L-shaped preform, a C-shaped preform and a prepreg twisted strip are combined through a combined forming tool formed by combining a metal mold tool and a pressure transmission soft mold tool and then assembled on the forming tool, autoclave co-curing operation is conducted after packaging, and finally the designed T-shaped stiffened wallboard composite material is obtained. By means of the method, the problem that during traditional co-curing forming, forming pressure transmission, T-shaped rib position precision and molded surface precision are difficult to consider at the same time can be solved, the method ensures that prepreg lamination forming of all positions of T-shaped ribs and skin is fully dense under a precise reference benchmark, and the forming precision, quality and forming efficiency of the T-shaped stiffened wallboard composite material are improved.
Owner:AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
Method and device for improving output characteristic of Nd:YAG passively-Q-switched laser
InactiveCN103414101AIncrease output powerHigh extinction ratioActive medium materialHigh absorptionOptoelectronics
The invention belongs to the field of lasers. A device for improving the output characteristic of an Nd:YAG passively-Q-switched laser comprises a semi-conductor laser body (1), a pump coupling device (2), a coupling input lens (3), an Nd:YAG crystal (4), a passively-Q-switched crystal (5), a coupling output lens (6) and an output laser (7). The device for improving the output characteristic of the Nd:YAG passively-Q-switched laser is characterized in that the Nd:YAG crystal (4) is an Nd:YAG crystal bar or strip in the [100] or [110] cut direction, the Nd:YAG crystal in the [110] cut direction is placed in the mode that the [010] direction or the [T10] direction of the Nd:YAG crystal is parallel to the polarization direction of pump light and the crystal axis of a Cr4+:YAG crystal respectively, and the Nd:YAG crystal in the [100] cut direction is placed in the mode that the [011] direction or the [01T] direction or the [0TT] or the [0T1] direction of the Nd:YAG crystal is parallel to the polarization direction of the pump light and the crystal axis of the Cr4+:YAG crystal. Due to the fact that the polarization direction of oscillating light accords with the direction of higher absorption of specially-orientated Nd:YAG crystal, the output power and the extinction ratio can be greatly improved.
Owner:BEIJING UNIV OF TECH
Method for removing trace organic pollutant contained in recycled water
InactiveCN104370402AReduce dosageEfficient removalWater/sewage treatment by irradiationWater contaminantsFiltrationTherapeutic effect
The invention discloses a method for removing trace organic pollutants contained in recycled water, and belongs to the field of recycled water treatment. The method comprises the following steps: pretreatment, namely filtering the recycled water; ozone preoxidation treatment, namely carrying out the ozone preoxidation treatment on pretreated effluent water; ultraviolet intensifying treatment, namely carrying out the ultraviolet intensifying treatment on a mixed solution, which is formed after the ozone preoxidation treatment, of water and ozone through ultraviolet radiation so as to complete the removal of the trace organic pollutants contained in the recycled water. The method disclosed by the invention enables the filtration, the ozone preoxidation treatment and the ultraviolet intensifying treatment to be complementary by organically combining three steps of the pretreatment, the ozone preoxidation treatment and the ultraviolet intensifying treatment, thereby efficiently removing the trace organic pollutants contained in the recycled water and having the advantages of high pollutant removal ratio and good treatment effect; and the action capability of the method disclosed by the invention is higher than the sum of the action effects of independent ultraviolet treatment and ozone treatment and the method can be used for reducing the ozone addition amount and the ultraviolet lamp output power and reducing the operating cost compared with a method for independently adopting the ozone treatment or the ultraviolet treatment.
Owner:SOUNDGRP CO LTD
Carbon/carbon composite honeycomb and preparation method thereof
ActiveCN108840697ANot easy to delaminate and crackImprove thermal stabilityCeramicwareCarbon compositesCarbon fibers
The invention discloses a carbon / carbon composite honeycomb and a preparation method thereof, and belongs to the technical field of carbon / carbon composites. The carbon / carbon composite honeycomb comprises a carbon fiber reinforcement body and a carbon substrate covering the surface of the carbon fiber reinforcement body; the carbon fiber reinforcement body adopts the honeycomb structure; and thehoneycomb structure has continuous carbon fibers in the L direction and also has continuous carbon fibers in the W direction. The carbon / carbon composite honeycomb has the excellent heat stability andmechanical properties, can meet the requirement for lightweight in the aerospace field and has main performance parameters such as the flat compression strength being higher than or equal to 8 MPa, the flat compression modulus being higher than or equal to 900 MPa, the L-direction shearing strength being higher than or equal to 6.7 MPa, the L-direction shearing modulus being higher than or equalto 1,500 MPa, the W-direction shearing strength being higher than or equal to 4.5 MPa, the W-direction shearing modulus being higher than or equal to 730 MPa and the thermal expansion coefficient ranging from 0 to 0.2*10<-6> / K.
Owner:AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
Microchip laser for preventing pump light from bleaching passive Q-switched crystal
PendingCN111769434ACompact structureImprove stabilityActive medium materialActive medium shape and constructionErbium lasersSaturable absorption
The invention discloses a microchip laser capable of preventing pump light from bleaching a passive Q-switched crystal. The microchip laser comprises a pump source, a pump coupling system, a gain medium, an ASE suppression crystal, the passive Q-switched crystal, the pump light and a laser separation structure. A 45-degree angle structure is cut on one side of the microchip laser, pump light and laser are separated through a film on the side, and bleaching of the passive Q-switched crystal by the pump light is avoided. Through hot bonds and technologies, the crystals are effectively and firmlycombined, the stability of the laser can be improved, and miniaturization of the microchip laser is facilitated. And the bonding interface of the bonded crystal is stable, thereby being beneficial toheat dissipation of the crystal. The microchip laser is widely applied to other solid-state lasers for distance measurement, the purposes of miniaturization, large energy and narrow pulse width are easy to achieve, and engineering application is easy to achieve. Pump light is completely prevented from entering the saturable absorption Q-switched crystal, so that the problem of pump bleaching is avoided, the monopulse energy output by oscillation laser is improved, and the pulse width is reduced.
Owner:BEIJING UNIV OF TECH
Common optical path multiple inclined wave surface compensation non-zero position interferometry device
ActiveCN103575229BEasy to realize engineering applicationHuge Industrialization PotentialUsing optical meansMeasurement deviceWavefront
The invention discloses a common-light-path type multiple inclined wave surface compensation nonzero-digit interference measurement device which comprises a Fizeau interferometer, a standard optical flat, a free-form surface gradient compensation module and a free-form surface to be measured. A primary optical axis of the free-form surface gradient compensation module coincides with a primary optical axis of the interference measurement device, a parallel light beam emitted by the Fizeau interferometer passes through the standard optical flat and is divided into two light beams, one light beam is reflected by the surface of the standard optical flat back to the Fizeau interferometer to be used as reference light, the other light beam enters in the free-form surface gradient compensation module and is emitted out of the free-form surface gradient compensation module, and testing light beams with different inclined angles are formed to irradiate the free-form surface to be measured in an incident mode, are reflected by the free-form surface to be measured back to the free-form surface gradient compensation module, finally are emitted out of the free-form surface gradient compensation module and return to the Fizeau interferometer to form test light. According to the test, high-precision measurement on the optical free-form surface large in local gradient and transportability modularization on the measurement device are achieved simultaneously.
Owner:NANJING UNIV OF SCI & TECH
Rubber aggregate dry-mixed mortar
The invention relates to a rubber aggregate dry-powder mortar, belonging to the technical field of novel construction material. In the construction energy-conserving field, the outer-wall external insulation technique is adopted as the main technique for the outer envelope insulation of energy-conserving constructions is a common consensus, but the system requires a large energy and sources. The invention aims at exploiting a second source technique, namely, the waste rubber aggregate dry-powder mortar which is formed by evenly mixing waste rubber aggregate, cement, sand, RPP, wood fiber and methyl cellulose, and the matching proportions of the materials by weight portion are as follows: 1 portion of cement, 0.25 to 1.75 portions of sand, 0.6 to 0.9 portion of water, 0.04 to 0.15 portion of RPP, 0 to 0.018 portion of wood fiber and 0 to 0.016 portion of methyl cellulose and 0.27 to 0.83 portion of rubber aggregate. The invention has excellent work capability and construction capability and not only can reach better insulation effect but can realize better economic benefit, and the construction energy-conserving effect is distinct.
Owner:BEIJING UNIV OF TECH
Metal-based energetic fragment with impact reaction activity and preparation method thereof
ActiveCN113651659AHigh strengthImprove plasticityExplosive working-up apparatusCompression moldingMicrocrystalline wax
The invention discloses a metal-based energetic fragment with impact reaction activity and a preparation method of the metal-based energetic fragment. The preparation method comprises the following steps: obtaining mixed powder formed by coating micron nickel powder with nano aluminum powder; performing vibration mixing on the mixed powder, metal oxide powder and microcrystalline wax to obtain an intermediate mixture; adding an organic solvent into the intermediate mixture for wet ball milling, and then drying to obtain a precursor; and carrying out compression molding on the precursor, and then carrying out sintering treatment to obtain the energetic fragment. The obtained energetic fragment is high in strength and good in plasticity. Meanwhile, the energetic fragment has good penetration and chambering capacity, and the impact reaction activity is remarkably improved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
High-chromium cast iron wear-resistant coating selective surfacing method and device
InactiveCN110508975ASimple structureReduce processing costsWelding/cutting auxillary devicesAuxillary welding devicesCast ironChromium
The invention discloses a high-chromium cast iron wear-resistant coating selective surfacing method and device. The method comprises the steps that a to-be-welded base metal is placed on the upper surface of a copper pipe of a circulating water cooling device, wherein the circulating water cooling device comprises a copper pipe cooling device and a cooling circulating system, the cooling circulating system is provided with a water outlet and a water inlet, and the two ends of the copper pipe respectively communicate with the water outlet and the water inlet of the cooling circulating system; the circulating water cooling device is started, so that cooling water flows between the copper pipe and the circulating water cooling device; the to-be-welded base metal is placed on the copper pipe,the to-be-welded base metal is taken as a matrix, and surfacing of high-chromium cast iron wear-resistant coating is carried out on the upper surface of the to-be-welded base metal; and in the surfacing process, the to-be-welded base metal is in direct contact with the cooling circulating system, and the cooling speed of a surfacing layer and the heat dissipation direction during cooling in the surfacing process of the high-chromium cast iron are controlled so as to control the growth direction of carbide, so that a main wear-resistant phase in the high-chromium cast iron wear-resistant coating, namely the carbide, grows vertical to the surface of the base metal. The method and the device have the advantages of being good in machining effect, and high in machining efficiency.
Owner:CHINA UNIV OF MINING & TECH
Super-lubricity performance metal/hydrogen-containing carbon composite thin film and preparation method thereof
ActiveCN111850470AUltra-smooth implementationAchieve preparationVacuum evaporation coatingSputtering coatingCarbon compositesSputtering
The invention relates to a super-lubricity performance metal / hydrogen-containing carbon composite thin film. The composite thin film comprises a hydrogen-containing carbon thin film deposited on a base material or the surface of a part and a metal thin film (gold, silver, copper and the like) deposited on the surface of the hydrogen-containing carbon thin film, wherein the carbon thin film is thehydrogen-containing carbon thin film with the hydrogen content of 15% to 28%, the thickness is 800 nm, and the thickness of the metal thin film is less than or equal to 100 nm. A target thin film containing hydrogen carbon is prepared by plasma chemical vapor deposition, and magnetron sputtering and the like, then metal is loaded through a high power micropulse magnetron sputtering or evaporationplating mode, and the super-lubricity performance metal / composite thin film containing hydrogen carbon can be obtained. In a friction process, the metal can catalyze amorphous hydrogen-containing carbon to form sequential multilayer graphene structures, and incommensurate contact of the multilayer graphene structures can achieve super-lubricity in a macro-scale atmospheric environment, an inertiaatmosphere, and vacuum. As a result, engineering application of a super-lubricity technology under the condition of cross-environment can be expected to achieve.
Owner:LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Preparation method of cellulose-modified modified nano-iron particles
ActiveCN104785793BFacilitate adaptation to in situ and heterotopic repairSimple processWater/sewage treatmentNitrateNanoscale iron particles
The invention discloses a method for modifying nano iron particles on the surface of cellulose. The invention uses two kinds of environment-friendly, non-toxic, harmless cellulose as dispersants, and in the preparation process of the nano iron particles, the surface of the particles is surface-treated. Modified and modified, the prepared cellulose dispersant modified nano iron particles. The process of the invention is simple and easy to operate, low in cost, and has good dispersibility of the nano-iron particles, which can reduce the agglomeration of the particles in water and improve the removal efficiency of the particles to organic pollutants, dyes, pesticides, nitrates and heavy metals.
Owner:KUNMING UNIV OF SCI & TECH
Phase extraction-based no-color difference three-dimensional character image processing method
InactiveCN104156716AImprove stabilityImprove efficiencyCharacter and pattern recognitionTime-sharingColor difference
The invention discloses a phase extraction-based no-color difference three-dimensional character image processing method. The method comprises steps: image acquisition is carried out, a laser scanning galvanometer is used for reflecting in a time sharing mode laser strips transmitted by a single-line laser on the surface of the three-dimensional character, a camera is then used for acquiring distorted light strip images, the distorted light strip images are stacked, and a raster image with a three-dimensional character topological structure is obtained; phase extraction is carried out on the obtained raster image on the basis of fourier transform, phase unwrapping is carried out on the extracted phase, an absolute phase of the three-dimensional character is obtained, absolute phase calculation is carried out on the background, the relative phase of the three-dimensional character is obtained according to the absolute phase of the three-dimensional character and the absolute phase of the background, the relative phase replaces the gray value of the character, and the gray image of the three-dimensional character is obtained through reconstruction. Compared with the prior method, stability is higher, the extraction process is simpler, the efficiency is higher, and engineering application is more easily realized.
Owner:SHANDONG UNIV
A kind of multi-element microalloyed high-strength heat-resistant rare earth magnesium alloy and preparation method thereof
The invention provides a rare earth magnesium alloy, which is a modified Mg-Gd-Y-Zr rare earth magnesium alloy; the as-cast metallographic structure of the rare earth magnesium alloy has rounded edges Mg 5 Gd phase; or, the metallographic structure of the rare earth magnesium alloy in the extruded state has small particle-like precipitates; the radial size of the small particles is 10-150 nm. The invention improves the microstructure and morphology of the alloy through the method of multi-element microalloying, improves the microstructure and morphology of the alloy material by adding a specific proportion of trace Ag and Sc, and improves the effect of age hardening and grain refinement, thereby obtaining excellent room temperature and temperature. High temperature mechanical properties. On the premise of not increasing the total amount of rare earths, the present invention has high strength and performance indexes, retains good plasticity, is easy to realize engineering application, and can meet the requirements for lightweight structural materials in the current aerospace, missile military, rail transit and other fields. Requirements for mechanical properties at room temperature and high temperature.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
A Novel Positive Sequence Impedance Differential Protection Method for Microgrid
ActiveCN105811383BLarge positive sequence impedance differential protectionImprove reliabilityEmergency protective arrangements for automatic disconnectionElectrical resistance and conductanceMicrogrid
Owner:ZAOZHUANG POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +2
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