62results about How to "Inhibition of collapse" patented technology

The invention discloses a blended foam material based on PLC and modified PLA and a preparation method thereof, and belongs to the foam material field. The foam material comprises, by weight, 60-90 parts of PLA, 1-25 parts of PCL, 2-10 parts of reinforcing agents, 1-3 parts of nanometer nucleating agents, 4 parts of foaming agents, 0.1-1 part of a blowing promoter, 1-3 parts of environment-friendly flame retardants and 0.5-1 part of a surfactant. According to the foam material and the preparation method thereof, composite foamed plastics with good mechanical properties and superior surface quality can be prepared.

The invention provides a preparation method of a high-compaction density 523-type ternary positive electrode material, and belongs to the technical field of preparation of a lithium ion battery positive electrode material. A high-compaction density and low-pH value lithium nickel cobalt manganate NCM523-type ternary positive electrode is in a spherical shape, grain D50 of secondary agglomeration particle is 10-12 micrometers, and the size of primary single-crystal particle is 1.5-3 micrometers. The preparation method of the high-compaction density 523-type ternary positive electrode material comprises the steps of doping 0.1-1.0% of metal oxide into a mixture of lithium carbonate and a ternary precursor LiNi<0.5>Co<0.2>Mn<0.3>(OH)<2>, performing primary sintering, paste washing, secondarysintering, breakage, iron removal, sieving and mixing, and finally, obtaining an NCM523-type ternary positive electrode material. By the method, the compaction density of the NCM523-type ternary positive electrode material is effectively improved, a pH value is reduced, the compaction density of the prepared NCM523-type ternary positive electrode material is larger than 3.7g / cm<3>, and the pH value is smaller than 10.80.

A HEMT has a compound semiconductor layer, a protection film which has an opening and covers an upper side of the compound semiconductor layer, and a gate electrode which fills the opening and has a shape riding on the compound semiconductor layer, wherein the protection film has a stacked structure of a lower insulating film not containing oxygen and an upper insulating film containing oxygen, and the opening includes a first opening formed in the lower insulating film and a second opening formed in the upper insulating film and wider than the first opening, the first opening and the second opening communicating with each other.

The invention belongs to the technical field of lithium ion battery anode materials, and discloses a silica / lignin porous carbon composite material, a preparation method thereof and application in a lithium ion battery anode material. The preparation method provided by the invention comprises the steps of: dissolving the industrial lignin and auxiliary agent in ethanol to prepare a solution havinga mass concentration of 5-20 g / L, adding nano silica for uniform mixing, adding water to precipitate, separating the precipitate, and drying to obtain a silica / lignin mixture; adding the mixture to water having a pH of 2 to 4 to prepare a suspension having a concentration of 10 to 100 g / L, carrying out reaction at 120 to 200 degrees centigrade for 1 to 3 hours, drying the precipitate after filtration, carrying out carbonization in the inert atmosphere of 500 to 900 degrees centigrade for 2 to 5 hours, immersing in 0.05-2mol / L of hydrofluoric acid for stirring for 1 to 24 hours, and obtainingthe silica / lignin porous carbon composite material after washing, filtering and drying. The invention may be applied to lithium ion battery anode materials.

Provided is a pneumatic tire which can improve the braking performance on ice and the partial-wear resistance. Sipes (11X) provided in a rib (5) on the tire equatorial plane (TE) are arranged in a three-dimensional shape where the amount of collapse of the rib (5) by the external force becomes smaller in one rotational direction of the tire than in the other rotational direction of the tire. In the block (10) of a shoulder region (1S), the sipes (11Ma) on the block tread-in side (10A) have a three-dimensional shape where the amount of collapse of the block by the external force when the sipes(11Ma) are provided entirely in the block (10) becomes smaller in one rotational direction of the tire than in the other rotational direction of the tire, and the sipes (11Mb) on the block kick-out side (10B) have a three-dimensional shape where the amount of collapse of the block by the external force when the sipes (11Mb) are provided entirely in the block (10) becomes smaller in the other rotational direction of the tire than in one rotational direction of the tire.

The invention discloses a multi-point synchronous hot-torsion forming device and forming method for a hollow blade. The multi-point synchronous hot-torsion forming device comprises a blade tenon clamping device, a multi-point pushing rod punch device and a heating device. According to the multi-point synchronous hot-torsion forming device and forming method for the hollow blade, precise control over torsional deformation of a blade body can be achieved through multi-point synchronous loading heat torsion, and meanwhile the mold manufacturing cost can be greatly reduced by applying a flexible tool composed of height-adjustable basic bodies which are arranged in a dot-matrix mode.

The invention relates to the technical field of lithium batteries, in particular to a lithium battery anode structure, a preparation method thereof and a lithium battery structure. The lithium batteryanode structure comprises an anode current collector and an anode thin film layer formed on the anode current collector, wherein the anode thin film layer is prepared from an anode material, and a transition layer and a decoration layer are sequentially formed on the side, away from the anode current collector, of the anode thin film layer. The transition layer is arranged on the anode thin filmlayer, and can effectively reduce the interfacial resistance between an anode thin film and the decoration layer, the decoration layer on the transition layer can effectively stop direct contact of electrolyte and the anode thin film layer, an irreversible reaction between the trace amount of HF (hydrogen fluoride) in the electrolyte and the anode battery structure containing the decoration layeris avoided, meanwhile, collapse of the anode structural layer under a high voltage charging state is restrained, and accordingly the reversible capacity and the circularity of a battery produced by utilizing the anode structural layer are improved.

An air mattress capable of preventing its bottoming from occurring in an integrated mattress. The air mattress comprises three sheets (1 to 3) mutually overlapped with each other, adhered to each other at their peripheral parts, and brought into a sealed state. First layer air cells (6a, 6b) formed of tubular air cells in the lateral direction by the first and second sheets (1, 2). The second layer air cells (8) are formed of tubular air cells formed in the lateral direction by the second and third sheets (2, 3). The first layer air cells (6a, 6b) and the second layer air cells (8) are arranged so as to be displaced from each other in the longitudinal direction.

The invention relates to a method for preparing cordierite composite ferrite infrared radiation ceramics. The method comprises the following steps: (1) weighing the following components in parts by weight: 20 parts of Fe2O3, 60 parts of MnO2, 10 parts of Co2O3, 10 parts of CuO, 20 parts of TiO2 and 5 parts of ZnO, uniformly mixing, and preparing ferrite by a gel method; (2) weighing 20% of ferrite, 77% of cordierite and 3% of calcined kaolin in percentage by weight, grinding the raw materials by an agate mortar, and uniformly mixing the ground materials to obtain powder for later use; (3) adding an adhesive solution accounting for 3% of the total weight of the powder for granulating, and aging for 24-36 hours; (4) pressing the powder, molding and drying to obtain the ceramic body; and (5)firing and molding the ceramic body, thereby obtaining the cordierite composite ferrite infrared radiation ceramics. With the adoption of the ferrite composite cordierite and kaolin with high radiation properties, the prepared infrared radiation ceramics have low thermal expansion coefficient, excellent thermal shock resistance and high infrared radiation properties.

The invention discloses a gas pressure measuring system for a mining-induced fracture field of a coal seam. The gas pressure measuring system comprises an exploration and collection device, a pluggingdevice and a measuring device. The exploration and collection device is installed in a borehole, and the plugging device is used for sealing the borehole. The exploration and collection device comprises a first pipe body, a second pipe body and a third pipe body, wherein the third pipe body extends into the bottom of the borehole, and the first tube body is located on the outermost side of the borehole. The plugging device comprises a plugging capsule, a capsule connecting pipe and a capsule operating platform. The measuring device comprises a gas pressure gauge, an electronic pressure measuring instrument and a gas collecting analyzer, wherein the gas pressure gauge, the electronic pressure measuring instrument and the gas collecting analyzer are connected in sequence, wherein the gas pressure gauge is connected to the front portion of the first pipe body. According to the gas pressure measuring system for the mining-induced fracture field of the coal seam, the stress of a mining-induced fracture of the coal seam can be analyzed, an excavation position is marked, so that the formation stress and gas seepage pressure are calculated, thus the occurrence of coal mine gas dynamic disasters are effectively prevented, and the gas pressure data can be automatically and periodically recorded, stored and transmitted.

The invention relates to a corrugated sandwich road protection structure. The corrugated sandwich road protection structure comprises spiral columns, a sandwich corrugated plate, main corrugated taper pipe assemblies, and subsidiary corrugated taper pipe assemblies; the sandwich corrugated plate comprises a corrugated shell, and fillers arranged in the corrugated shell; the upper portion of each spiral column rotates along the axis and forms warped surfaces; and each main corrugated taper pipe assembly and each subsidiary corrugated taper pipe assembly are connected with the sandwich corrugated plate and the upper portion of corresponding spiral column, the main corrugated taper pipe assemblies are obliquely connected with the sandwich corrugated plate, and the subsidiary corrugated taper pipe assemblies are vertically connected with the sandwich corrugated plate. The corrugated sandwich road protection structure solves the problems that protective fences of a general road and an expressway are not strong enough in crashworthiness, single in energy-absorbing form, and poor in buffering effects, and cannot effectively prevent vehicles off the road. The corrugated sandwich road protection structure has the beneficial effects of having a characteristic of high energy absorption; being safe and reliable with high stability, strong in crashworthiness, and high in adaptability of impact angle; and being easy to mount, convenient to replace, and high in sustainable use.

The invention discloses a lithium titanate composite negative electrode material, a preparation method thereof and a lithium-ion battery. The technical problem to be solved is to improve the electrochemical performance of the lithium titanate composite negative electrode material. The preparation method of the lithium titanate composite negative electrode material comprises the steps of preparinga transition group metal salt solution, preparing MXene particles loaded with transition metal salt, preparing a MXene and nano carbon composite material, performing acid purification on the MXene andnano carbon composite material, preparing a precursor, and calcining to obtain the lithium titanate composite negative electrode material. In the lithium-ion battery of the present invention, a negative electrode is made of the lithium titanate composite negative electrode material of the invention, compared with the prior art, lithium titanate nanoparticles are jointed with a flexible frame woven by MXene and nano carbon, the composite material with three-dimensional self-supporting properties of lithium titanate, the MXene and the nano carbon is obtained, the composite material has the advantages of good conductive performance and good cycle stability, and the electrochemical performance and safety of the lithium-ion battery are effectively improved.

A method for laser-stirring friction composite welding of a large-thickness plate is characterized by comprising the steps that 1, the to-be-welded workpiece plate is provided; 2, a stirring frictionmachining head is arranged on the back of the to-be-welded workpiece plate; 3, a laser welding head is arranged on the front face of the to-be-welded workpiece plate; 4, the upper surface of the to-be-welded workpiece is irradiated by high-energy laser beams focused by the laser welding head, and the high-energy laser beams move in the welding direction; 5, the stirring friction machining head isstarted, rotates at high speed, enters to-be-welded workpiece material and moves in the welding direction; and 6, the welding destination is reached, the stirring friction machining head moves out ofthe to-be-welded workpiece material, and the high-energy laser beams are stopped. In the method, a semi-solid stirring pool is obtained through stirring friction welding, forming of collapse, root leakage and other defects in the laser welding process of the large-thickness plate is restrained, and quality of a weld joint is improved greatly.

The invention discloses polybenzoxazine aerogel and a preparation method thereof, and belongs to the technical field of aerogel materials. The preparation method comprises the steps of: dissolving a benzoxazine monomer in an organic solvent to obtain a benzoxazine monomer solution; adding an aliphatic polyamine cross-linking agent, mixing well, pouring the solution into a mold, heating for a gelation reaction, and aging to obtain polybenzoxazine wet gel; then carrying out normal pressure drying to obtain polybenzoxazine aerogel with a low reaction degree; and heating to 200 DEG C in air in a stepped manner, preserving heat for 2-12 hours at each temperature section, and cooling to room temperature to obtain polybenzoxazine aerogel. The linear shrinkage rate of the aerogel can be reduced, and the aerogel is good in thermal stability and easy to form.

The invention relates to an adhesive and a method for preparing an iron-based copper microelectrolytic sectional material. Based on requirements for sewage microelectrolytic treatment methods, silica sol and sodium hexametaphosphate are added to reach the purpose of modification of magnesium oxychloride cement. Through the cementation effect of products obtained by reactions among components, the iron-based copper particles are cemented, and a cementation skeleton of the iron-based copper particles is formed which has certain strength, can resist acidic water corrosion, and has certain conductivity; therefore, collapse of a bed layer is inhibited; the service life and time is prolonged; and the hardening problem is solved finally.

The invention discloses a cutting blade. Upper main cutting edges and lower main cutting edges have the same positive acute-angled cutting clearance angles; at least parts of the upper main cutting edges on the same side are projected relative to the lower main cutting edges on the same side; and at least parts of the lower main cutting edges on the same side are projected relative to the upper main cutting edges on the same side. A cutting tool comprises a cutter body, a fastening piece and the cutting blade; at least one cutter groove is formed in the cutter body; at least two groups of chip holding grooves are formed in each cutter groove; a blade body is fixed in the cutter grooves through the fastening piece; the cutter grooves include cutter groove side surfaces and cutter groove bottom surfaces; the upper surface or the lower surface of the blade body is tightly bonded with the cutter groove bottom surfaces; and the upper side surface or the lower side surface of the blade body is tightly bonded with the cutter groove side surfaces. The cutting blade has the advantages of low cutting vibration, light and fast cutting, good cost performance, good positioning rigidity, good chip removing performance, long service life and capability of being widely applied to rough machining and finish machining.

The invention discloses a cutting blade. At least one part of an upper main cutting edge at the same side is protruded relative to a lower main cutting edge at the side; and at least one part of the lower main cutting edge at the same side is protruded relative to an upper main cutting edge at the side. The cutting tool comprises a tool body, a fastener and the cutting blade, wherein at least one tool slot is formed in the tool body; at least two groups of chip flues are formed in each tool slot; a blade body is fixedly arranged in the tool slot through the fastener; the tool slot comprises a tool slot side surface and a tool slot bottom surface; the upper surface or the lower surface of the blade body clings to the bottom surface of the tool slot; and the upper side surface or the lower side surface of the blade body clings to the side surface of the tool slot. The cutting blade has the advantages such as good edge strength, good positioning rigidity, high cutting efficiency, a long service life and efficient rough machining.

The invention relates to a preparation method of cordierite infrared radiation multiphase ceramic. The preparation method comprises the following steps: (1) weighing 35% of Fe2O3, 45% of MnO2, 10% ofCo2O3 and 10% of CuO in percentage by weight and preparing ferrite through a gel method; (2) weighing 10% of ferrite, 87% of cordierite and 3% of calcined kaolin calculated in percentage by weight, grinding and uniformly mixing the raw materials with an agate mortar to obtain powder for later use; (3) adding a binder solution which accounts for 3% of the total weight of the powder to granulate andaging for 24 to 36 hours, (4) pressing the powder into a shape and drying to obtain a ceramic blank; (5) firing the ceramic blank to obtain the cordierite infrared radiation multiphase ceramic. The preparation method of the cordierite infrared radiation multiphase ceramic disclosed by the invention adopts ferrite composite cordierite with high radiation performances and the calcined kaolin, so that the prepared infrared radiation ceramic is lower in thermal expansion coefficient, good in thermal shock resistance and higher in infrared radiation properties.

The present invention is a substrate for a semiconductor device having a substrate, a buffer layer which is provided on the substrate and which comprises a nitride semiconductor, and a device active layer comprising a nitride semiconductor layer provided on the buffer layer, wherein the substrate for a semiconductor device is characterized in that: the buffer layer has a first region containing carbon and iron, and a second region which is located on the first region and which has a lower average concentration of iron than does the first region and a higher average concentration of carbon thandoes the first region; and the average concentration of carbon in the second region is lower than the average concentration of iron in the first region. Thereby provided is a substrate for a semiconductor device with which it is possible to suppress a lateral leak current during high-temperature operation of the device while suppressing a longitudinal leak current, and to suppress a current collapse phenomenon.

The invention discloses graphene solar HJT cell front silver paste and a preparation method thereof. The front silver paste is prepared from the following raw materials in percentage by weight: 5-20% of nano silver powder, 70-90% of flake silver powder, 2-10% of an organic carrier, 0.1-5% of an organic auxiliary agent and 0.1-1% of graphene. The front silver paste has the beneficial effects that (1) the nano silver powder with a specific size and the flake silver powder are mixed for use, and the graphene is added, so that the morphology of a silver network is improved, the densification is increased, and the resistivity during low-temperature curing is reduced; (2) on the basis of not changing the thixotropy of the front silver paste, the nano silver powder and the graphene are modified to increase the dispersity of substances, so that the stability of the silver paste is improved; and meanwhile, through surface modification, the printability of the silver paste is improved, the heterojunction quality of a solar cell is improved, and the photoelectric conversion efficiency is improved.

The invention discloses a blade for carrying out groove processing and cutting, which comprises an upper positioning surface, a lower positioning surface, two end surfaces and two lateral sides. The lateral sides are connected with the upper positioning surface and the lower positioning surface; the upper positioning surface is provided with M discontinuous upper positioning tables; N discontinuous lower positioning tables are arranged on the lower positioning surface; wherein M is more than or equal to 2 and less than or equal to 10, and N is more than or equal to 2 and less than or equal to 10. With the adoption of the blade for carrying out groove processing and cutting, the positioning position and the angle can be automatically adjusted, the structure is stable, and the service life is long.

The invention relates to a preparation method of an SOI-based concave gate enhanced GaN power switch device. The preparation method comprises the following steps of passivating for the first time; forming the ohmic contact in the source and drain regions; carrying out ion implantation; etching a concave gate region; growing a gate dielectric layer and a gate metal; passivating for the second time;opening a source-drain window; performing deep groove etching for the first time; performing deep groove etching for the second time. The advantages of simpler process and small gate leakage currentbrought by a concave gate structure prepared by the method and the device monolithic isolation advantage brought by an SOI material lay a solid foundation for realizing a GaN monolithic integrated half-bridge circuit, and a new direction for the development of GaN power devices is provided.

The invention discloses a reinforcing rib structure for preventing a channel cooling flat pipe from deforming, and a flat pipe reinforcing method. The reinforcing rib structure comprises a plurality of transverse reinforcing ribs, the transverse reinforcing ribs are of a flat annular structure, the transverse reinforcing ribs are arranged in parallel in the length direction of the cooling flat pipe in a sleeving mode, and the transverse reinforcing ribs are fixedly connected with the cooling flat pipe. The adjacent transverse reinforcing ribs are arranged at equal intervals, longitudinal reinforcing ribs are connected between the adjacent transverse reinforcing ribs, the two ends of each longitudinal reinforcing rib are connected with the adjacent transverse reinforcing ribs respectively, and rod bodies of the longitudinal reinforcing ribs are connected with the cooling flat pipes. The top welding type galvanic couple of the cooling flat pipe is prevented from being stretched and damaged by collapse of the flat pipe, the service life of the galvanic couple is prolonged, and accurate control over the temperature is achieved.