Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Hiro

392results about How to "Slow down the spread" patented technology

Halogen-free cleaning-free rosin flux, and preparation and application thereof

The invention discloses a halogen-free cleaning-free rosin flux, and preparation and application thereof, and particularly relates to a flux suitable for surface mount lead-free welding paste, preparation of the flux and application of the flux. The flux comprises 20-50% (mass fraction, the same below) of rosin, 5-25% of film-forming agent, 30-50% of high boiling solvent, 3-8% of activator and 2-5% of thixotropic agent, and the flux does not contain any halogen. In order to control growth of interface IMC (intermediate compound) during welding, 0.3-1% of combined inhibitor is added. The welding paste prepared with the flux and lead-free tin-silver-copper powder has the advantages of excellent printing performance, fine weldability, less post-weld residue, thin and even welding spot interface IMC and excellent mechanical property, and is capable of meeting the requirement of high-end electronic products on packaging.
Owner:CENT SOUTH UNIV

Protective sealing door for underground refuge chamber

The invention discloses a protective sealing door for an underground refuge chamber. The protective sealing door comprises a door frame and a door plate, wherein the door plate is arranged on the door frame through a rotation shaft; a locking mechanism for locking the door plate on the door frame is arranged on the door plate, a plurality of first reinforcing ribs for reinforcing the strength of the door plate are arranged in the door plate; heat-insulating materials, namely aerogel heat-insulating felts are filled among the reinforcing ribs; at least two annular sealing rings, namely flame-resisting sealing rings are arranged at the joint of the door plate and the door frame; and the periphery of the door plate is locked by the locking mechanism. According to the protective sealing door, the aerogel heat-insulating felts which can bear the temperature of 1,400 DEG C to the maximum are filled in the door plate, so that the door plate can resist high temperature generated during explosion, and the high temperature is insulated out of the refuge chamber; at least two sealing rings which are made of flame-resisting, anti-static, high temperature-resisting and oil-resisting materials are arranged on the contact surface of the door plate and the door frame, so that the protective sealing door has a good sealing effect.
Owner:CCTEG CHINA COAL RES INST

Thermo-sensitive poly N-isopropylacrylamide/polyurethane medicine-loading electro-spun fibrous membrane and preparation method thereof

The invention relates to a thermo-sensitive poly N-isopropylacrylamide/polyurethane medicine-loading electro-spun fibrous membrane and a preparation method thereof, relating to a medicine-loading electro-spun fibrous membrane and a preparation method thereof and aiming to solve problems of poor mechanical property of existing poly N-isopropylacrylamide medicine-loading electro-spun fibrous membrane and no temperature sensitivity of a polyurethane medicine-loading electro-spun fibrous membrane. The thermo-sensitive poly N-isopropylacrylamide/polyurethane medicine-loading electro-spun fibrous membrane is prepared by poly N-isopropylacrylamide, polyurethane, N,N-dimethylformamide and a medicine; the preparation method comprises the following steps: 1, preparing static spinning solution; 2, dissolving the medicine so as to obtain the static spinning solution containing the medicine; 3, carrying out electrospinning; and 4, carrying out dry treatment to obtain the thermo-sensitive poly N-isopropylacrylamide/polyurethane medicine-loading electro-spun fibrous membrane. According to the invention, the preparation method is mainly used for preparing the thermo-sensitive poly N-isopropylacrylamide/polyurethane medicine-loading electro-spun fibrous membrane.
Owner:HARBIN INST OF TECH

Ca and heavy rare earth Gd-containing die-casting heat resisting magnesium alloy and preparation thereof

The invention relates to a die-casting heat resistant magnesium alloy containing Ca and heavy rare earth element Gd and a preparation method thereof, pertaining to the metal material technical field. The components and weight percentage thereof of the alloy are: 3.0 to 8.0 percent of Al, 0.1 to 3.0 percent of Ca, 0.1 to 3.0 percent of Gd, 0 to 0.5 percent of Mn, lower than 0.02 percent of impurity elements and the rest is Mg. The preparation method of the alloy comprises the following steps: the materials are weighed, and industrial pure Mg is heated under the protection of the mixed gas of N2 and 0.2 percent of SF6; after Mg is wholly melted, industrial pure Al, industrial pure Ca and Al-Mn interalloy are added at the temperature of 650 to 680 DEG C, Mg-Gd interalloy is added at the temperature of 660 to 680 DEG C, the temperature is increased to 740 to 760 DEG C, and when the Mg liquid is cooled to 670 to 690 DEG C, the mixture carries out die casting. The preparation method of the invention has the advantages of low cost and high production efficiency, obviously increases the tensile strength, the yield strength, the elongation percentage and the creep resistance of the alloy at room temperature, and has excellent die-casting performance.
Owner:SHANGHAI JIAO TONG UNIV

Process for preparing antioxidant and wear-resistant layer on surface of copper

The invention provides a process method for preparing an aluminide penetrating layer on the surface of pure copper or a copper alloy by combining the thermal spraying technology and the thermal treatment technology, which comprises the following steps: firstly, spraying a layer of pure aluminium coating on the surface of a copper product through arc; secondly, performing shot blasting and sealingagent coating treatment on the surface of the coating; and finally, performing thermal treatment at a temperature of between 800 and 900 DEG C, maintaining the temperature for 2 to 4 hours, and obtaining an aluminide layer over 3mm on the surface of the pure copper. The aluminide layer prepared by the method has good combination with a copper substrate, good antioxidant performance and good wear resistance. The method can prepare the aluminide penetrating layer, and also can prepare aluminium-molybdenum, aluminium-silicone, aluminium-chromium binary or multi-metallic diffusion layers.
Owner:SHENYANG POLYTECHNIC UNIV

Dust removing system for fully-mechanized coal mining workface

The invention discloses a dust removing system for a fully-mechanized coal mining workface. The system includes a dust control system installed on one side of a roadheader, a dust suction system and a dust collecting system installed on the other side of the roadheader, wherein the dust control system comprises a press-in type fan, a press-in type air duct and a wall-attached air duct which are connected with each other in turns; the dust suction system comprises a first suction hood for sucking dust on the cutting head position of the roadheader, a second suction hood for sucking dust on the insertion board position of the roadheader, a third suction hood for sucking dust on the break-of-bulk-point position of a scraper conveyor and belt conveyor, a dust suction air duct and a suction hood assembly box, and the first suction hood, the second suction hood, the third suction hood and the dust suction air duct are all connected to the suction hood assembly box; the dust collecting system comprises an extraction type air duct, a dust remover and an extraction type fan which are connected with each other in turns, and the extraction type air duct is connected to the suction hood assembly box. The dust removing system for the fully-mechanized coal mining workface can effectively control diffusing and spreading of dust in underground roadways, has a good dust suction effect and high dust collecting efficiency, and can greatly reduce the dust concentration of the fully-mechanized coal mining workface.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)

Low steady-speed radial flow clean room air-conditioning air supply and return system

The invention relates to a low steady-speed radial flow clean room air-conditioning air supply and return system which comprises a radial flow air supply channel device, a wall-mounted air return channel device, an air-conditioning outlet static pressure box, an air-conditioning air return port static pressure box and an air-conditioning fresh air port filtering device, the radial flow air supply channel device comprises a clean room roof, a static pressure box type air supply channel, a pressure equalizing partition plate, an arc-shaped radial flow cover, a damping layer and a high efficiency filter bank, and the wall-mounted air return channel device comprises a sandwich wall type air return duct and a filtering device mounted at an air return port of the lower end of the sandwich wall type air return duct. The air supply and return system has the advantages that the operation resistance of the air supply and return system is reduced, the diffusion speed of harmful suspended particles in a clean room is the lowest, fewer high efficiency filter banks are used, the clean room is low in construction investment, energy-saving in operation and convenient to maintain, the air cleanliness class of the clean room is improved by more than 30% as compared with that of a mixed airflow clean room, clean time can be shortened by more than 40%, and airflow in the clean room is reasonably distributed.
Owner:SHIJIAZHUANG AOXIANG MEDICAL ENG

Magnesium aluminate spinel enhanced magnesia-based foamed ceramic filter and preparation method thereof

The invention discloses a magnesium aluminate spinel enhanced magnesia-based foamed ceramic filter with capability of realizing sintering at low temperature, excellent chemical stability and excellentthermal shock resistant performance, and a preparation method thereof. The preparation method comprises the following steps that (1) 10 to 20 percent of nanometer alumina sol, 0.8 to 1.5 percent of rheological agents and the balance of magnesium oxide ceramic powder containing a nanometer aluminum oxide sintering aid are proportioned; deionized water is added; ball milling and uniform mixing areperformed; then, through vacuum exhaust, ceramic slurry with the solid content being 60 to 70 percent is prepared; (2) a polyurethane foamed plastic template is soaked into the ceramic slurry; the polyurethane foamed plastic template is extruded through a roller press for removing the redundant leaching hanging slurry; then, biscuit is prepared; then, the biscuit is heated to 80 to 120 DEG C for drying; (3) the dried biscuit is put into a sintering furnace; the temperature is raised to 1400 to 1600 DEG C; high-temperature sintering is performed; cooling is performed along with the furnace to room temperature; the magnesia-based foamed ceramic filter is obtained.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Nickel-based high temperature alloy, preparation method thereof as well as application thereof in spark plug electrode

The invention relates to a nickel-based high temperature alloy, a preparation method thereof as well as application thereof in a spark plug electrode. The nickel-based high temperature alloy contains the following components in percent by weight: 0.04%-0.06% of C, 19%-21% of Cr, 7%-9% of W, 5%-7% of Mo, 1%-2% of Ti, 0.5%-2% of Al, 0.004%-0.006% of B, 0.03%-0.05% of Zr, 0.7%-0.9% of Fe, 0-3% of Nb, 0-1% of Y, and the balance of Ni and inevitable impurities. The preparation method of the nickel-based high temperature alloy comprises the following steps of: mixing the components in a vacuum electric-arc melting furnace according to a proportion, smelting, getting out and forming; heating up to 1200 DEG C in a heating furnace, carrying out thermal-insulation solid-solution treatment for 4 hours, and carrying out air-cooling; and carrying out thermal-insulation aging treatment for 10 hours at 800 DEG C, and carrying out air-cooling to prepare the nickel-based high temperature alloy. The nickel-based high temperature alloy disclosed by the invention has good high-temperature oxidation resistance and corrosion resistance, and can be applied to the spark plug electrode material so as to prolong the service life of an electrode and the service life of a spark plug.
Owner:SHANDONG UNIV

HRB500 reinforcing steel bar and preparation method thereof

The invention discloses an HRB500 reinforcing steel bar and a preparation method thereof. The reinforcing steel bar comprises the following chemical components in percentage by weight: 0.10-0.18% of C, 0.2-0.8% of Si, 1.2-1.6% of Mn, less than or equal to 0.04% of P, less than or equal to 0.04% of S, 0.001-0.005% of B and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: heating a billet to 1,150-1,250 DEG C in a furnace; performing heat preservation for 100-120 minutes; taking the billet out of the furnace; rolling when the temperature is within 1,050-1,150 DEG C; rolling, and cogging for two times, wherein the billet is rolled for 14-18 times in all roughly, moderately and finely, and the total compression ratio is 64-156; cooling to 600-680 DEG C at a speed of 8-12 DEG C / s after the fine rolling is finished; finally air-cooling to the room temperature. According to the HRB500 reinforcing steel bar and the preparation method, the strength of the reinforcing steel bar is improved through tissue phase change. Compared with the prior art, the HRB500 reinforcing steel bar is smelted by using a smelting method for ordinary steel, and is subsequently cast into the billet, and meanwhile the alloy content is reduced, so that the product cost is lowered.
Owner:武汉钢铁有限公司

Concrete-curing agent applicable to strong-wind arid area and preparation method thereof

ActiveCN102320860AStrong hydrophobicityImprove hydrophobicityIonEmulsion
The invention relates to a concrete-curing agent applicable to a strong-wind arid area and a preparation method thereof. The curing agent is prepared through the following steps of: by using an organic / inorganic composite system with an organic-silicon / fluorine modified propyl-benzene emulsion and active aluminum-silicate modified sodium-silicate solution as a main fluid and adopting a siloxane organic-silicon compound with a certain reactive group as a cross-linked component, compounding with a film-forming aid, a defoaming agent, a thickening agent, a wetting and dispersing agent, a mildew-proof agent, a flatting agent, an ultraviolet-resisting agent and deionized water under the condition at a normal temperature. The production process of the concrete-curing agent is simple, and reaction conditions are easy to control. The water-resisting property, the scrubbing-resisting property, the durability and the flexibility of a film after the film of the curing agent is formed are improved by introducing the propyl-benzene emulsion of organic silicon / fluorine onto a high-molecular chain; and the compactness of the film is enhanced by introducing the modified sodium-silicate solution, thereby the water evaporation of a concrete surface is greatly reduced. The curing agent has the technical characteristics that the curing agent can be sprayed after concrete is finished, the film-forming speed is high, the water retention rate is high, ultraviolet rays are resisted, and the like, and is applicable to the concrete curing of western strong-wind arid areas.
Owner:RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +1

Membrane electrode assembly for fuel cell, method of preparing the same, and fuel cell using the membrane electrode assembly for fuel cell

InactiveUS20070184336A1High membrane performanceReduce diffusion speedFinal product manufactureWater management in fuel cellsCathode catalystMembrane configuration
A membrane electrode assembly for a fuel cell, a method of preparing the same, and a fuel cell using the membrane electrode assembly for a fuel cell. The membrane electrode assembly includes an anode comprising an anode substrate, an anode diffusion layer, and an anode catalyst layer having pores; a cathode comprising a cathode substrate, a cathode diffusion layer, and a cathode catalyst layer having pores; and an electrolyte membrane interposed between the cathode and the anode, wherein the anode diffusion layer is hydrophilic and the cathode diffusion layer is hydrophobic, and the average diameter of the pores of the anode catalyst layer is smaller than the average diameter of the pores of the cathode catalyst layer. In the membrane electrode assembly, air can be easily supplied to the cathode and water can easily flow out of the cathode, thereby obtaining high performance of the membrane electrode assembly, and the anode catalyst layer has relatively small pores, thereby improving durability of the anode and reducing the diffusion speed of methanol in the anode catalyst layer to maintain the initial performance of a battery for a long time.
Owner:SAMSUNG SDI CO LTD

Polymer viscous acid

PendingCN106433606AReduce frictionStrong ability to suspend fine sandDrilling compositionPolymer scienceFiltration
The invention provides a polymer viscous acid. The polymer viscous acid comprises acid, a hydrophobic associative polymer thickener, a corrosion inhibitor and an iron ion stabilizer. According to the invention, the hydrophobic associative polymer thickener is adopted as a thickening agent of the viscous acid. Hydrophobic groups of the polymer are associated together in the acid liquid, such that a huge space network structure is formed in the solution, and solution thickening property is improved. The diffusion speed of hydrogen ions in the acid liquid to cracks and gaps is reduced. Also, a formed associated network structure assists in effectively limiting the activity of hydrogen ions. Therefore, acid liquid consumption rate is greatly reduced, effective action distance is increased, acid rock reaction is retarded, crack width is increased, and stratum permeability is improved. The association of hydrophobic groups also assists in improving the temperature resistance and salt resistance of the solution. The formed associative polymer has lower hydrogen ion mass transfer coefficient under high temperature and better high-temperature resistance. The prepared viscous acid has the characteristics of low filtration loss, low friction resistance and high fine sand suspension capacity, such that secondary stratum damage can be retarded.
Owner:SICHUAN GUANGYA POLYMER CHEM

Preparation process of tissue-controllable high-aluminum-content Cu-Al2O3 nano dispersion copper alloy

The invention discloses a preparation process of a tissue-controllable high-aluminum-content Cu-Al2O3 nano dispersion copper alloy. According to the preparation process, the Cu-Al2O3 nano dispersion copper alloy is prepared by performing ball milling activation and two-stage internal oxidation on Cu-Al alloy powder of which the Al content is 0.5 to 1.0 percent by weight; the tensile strength of the Cu-Al2O3 nano dispersion copper alloy at room temperature is larger than or equal to 550Mpa, the elongation rate is larger than 20 percent, and the electric conductivity is larger than 78 percent IACS; when the Cu-Al2O3 nano dispersion copper alloy is tensioned at a temperature of 700 DEG C, the tensile strength is larger than or equal to 245MPa. The preparation process is reasonable, and is convenient to operate, the formation of Al2O3 particles which are distributed continuously or densely along a crystal boundary in a high-temperature internal oxidation process can be effectively avoided;a prepared material has the advantages of high electric conductivity and high room temperature and high-temperature strength and elongation rate, so that the prepared Cu-Al2O3 nano dispersion copperalloy has superior performance, high strength and high electric conductivity. Thus, urgently needed raw materials are provided for the assembly of spot-welding electrodes, electrovacuum devices and high-voltage direct-current relays on an automatic welding production line in industries such as electronics, appliances, electric vacuum, batteries and new energy automobiles, and the preparation process is suitable for industrial production.
Owner:湖南高创科惟新材料股份有限公司

Water covering type explosive welding method of metal compound

The invention provides a water covering type explosive welding method of a metal compound. The method comprises the steps of polishing a base plate (1) and horizontally arranging on a clay foundation (5); uniformly arranging a plurality of supports (7) on the base plate; horizontally arranging a compound plate (3) on the base plate through the plurality of supports; adhering an explosive frame (2) to the surrounding of the compound plate through an adhesive bag in the length and width directions; uniformly paving explosive (6), wherein the explosive is paved and controlled to be 2.4 to 4.0g/cm<2> in height H; arranging a water box (8) on the explosive frame and staggering to form a gap for storing detonator (1); slowly pouring water (9) into the water box and keeping the depth less than or equal to H/2; detonating the explosive through the detonator during explosive welding. According to the method, water in the water box can slow down the explosive energy upwards diffusing and can also raise the explosive utilization rate during explosive welding; meanwhile, water can be atomized when the explosive is detonated, and therefore, a large amount of poisonous gas generated by explosive welding can be absorbed by the atomized water, and moreover, lots of clay dust and explosion-caused dust can be collected so as to reduce the pollution to the working environment.
Owner:LUOYANG SHUANGRUI METAL COMPOSITE MATERIAL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products