18results about How to "Inhibit interface reaction" patented technology

The invention provides an aluminum-based composite material reinforced by nickel-coated silicon carbide through a magnetron sputtering dry method and a preparation process of the aluminum-based composite material, and relates to the technical field of metal-based composite materials and advanced electronic packaging thermal management materials. Comprising the following steps that S1, silicon carbide particles coated with nickel through a magnetron sputtering dry method and aluminum powder are put into a mold to be subjected to compression molding, and an initial blank is obtained; and S2, the initial blank prepared in the step S1 is placed in a re-pressing sintering furnace under the inert gas protection condition, continuous re-pressing is conducted under the temperature condition ranging from the temperature lower than the aluminum melting point by 50 DEG C to the temperature higher than the aluminum melting point by 200 DEG C, and the nickel-coated silicon carbide reinforced aluminum-based composite material obtained through the magnetron sputtering dry method is obtained. The aluminum-based composite material reinforced by magnetron sputtering dry nickel-coated silicon carbide disclosed by the invention is excellent in heat-conducting property and mechanical property and long in service life.

A disclosed stirring and mixing device for composite material production comprises a stirring tank body, the outer wall of the top of the stirring tank body is provided with a sealing cover plate, the inner wall of the bottom of the stirring tank body is communicated with a discharging pipe, the bottom of the discharging pipe is fixedly provided with an electric control ball valve through a bolt, and the outer wall of the stirring tank body is sleeved with a cylindrical cooling shell; supporting legs distributed at equal intervals are welded to the outer wall of the bottom of the cylindrical cooling shell, the inner wall of one side of the cylindrical cooling shell communicates with a water inlet pipe, and the bottom of the inner wall of the other side of the cylindrical cooling shell communicates with a water drainage pipe. In the process of mixing and stirring silicon carbide, in order to reduce an interface reaction, a continuously flowing cooling medium is matched with mutual contact of a cylindrical cooling shell, a rotating sleeve and a stirring shaft, so that efficient cooling of the stirring shaft and the rotating sleeve can be realized, and temperature rise caused by heat generated by friction in the stirring process is inhibited; therefore, the interface reaction is inhibited.

The invention provides a solid electrolyte and application thereof, and the solid electrolyte at least comprises: a core body comprising a sulfide electrolyte; the surface of the core body is coated with the shell layer, and the shell layer comprises lithium iodide and lithium fluoride. According to the solid electrolyte and the application thereof provided by the invention, the stability of the solid electrolyte to air and positive and negative electrodes can be improved, so that the cycle life and the stability of a battery are improved.

The invention discloses a preparation method for in-situ generation of an Al3Fe nanoparticle reinforced aluminum-based composite material, and belongs to the technical field of metal-based composite material preparation. Comprising the following steps that (1) mixed powder is prepared, and the mixed powder is weighed according to the mass percent of 3%-13% of nano carbon-coated iron powder and the balance pure Al; (2) carrying out ball-milling treatment on the mixed powder, loading the mixed powder into a ball-milling tank, and carrying out ball-milling treatment on the mixed powder in an argon environment; (3) sintering and molding; (4) carrying out hot extrusion on the sintered composite material block; the tensile strength of the high-volume-fraction in-situ generated Al3Fe nano-particle reinforced aluminum-based composite material at room temperature reaches 473.76 MPa, the hardness reaches 175.47 HV, the tensile strength at high temperature can reach 204.63 MPa, and the high-volume-fraction in-situ generated Al3Fe nano-particle reinforced aluminum-based composite material has the advantages of being high in strength, resistant to abrasion, low in thermal expansion coefficient, excellent in heat-conducting property and the like.

The invention provides a diamond and negative expansion particle reinforced aluminum matrix composite and a preparation method, and belongs to the technical field of composites. The aluminum-based composite material is composed of a diamond phase and a negative thermal expansion phase which are dispersed in an aluminum matrix. The average particle size of the diamond phase is 10-1000 [mu] m, and the ratio of the average particle size of the diamond phase to the average particle size of the negative thermal expansion particles is 10-20; the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than that of the negative thermal expansion particles away from the diamond phase. The diamond and negative expansion particle reinforced aluminum-based composite material with excellent thermophysical performance is obtained by regulating and controlling the volume fraction of the diamond and the negative expansion particles, the thermal expansion coefficient matched with a semiconductor material is prepared through a collaborative optimization strategy, and the diamond and negative expansion particle reinforced aluminum-based composite material is applied to the field of electronic packaging heat dissipation materials.

This invention relates to the field of solid-state battery technology and discloses a dual-phase solid electrolyte powder and its preparation method. The dual-phase solid electrolyte powder is a uniform composite of LATP (lithium aluminum titanium phosphate) and LLZTO (lithium lanthanum zirconium tantalum oxide), with a LATP to LLZTO weight ratio of 1:2 to 2:1, a particle size of 1 to 3 μm, and an ionic conductivity ≥2.3 × 10⁻⁶. ‑ ³S / cm. Its preparation method includes LATP precursor solution preparation, slurry preparation, spray pyrolysis, and high-temperature calcination steps. This invention, through the synergistic effect of a two-phase structure, combines the high bulk ionic conductivity of LATP with the good interfacial stability of LLZTO, effectively reducing interfacial impedance and suppressing Ti in LATP. 4+ The reduction reaction improves lithium-ion transport efficiency and cycle stability. Batteries using this electrolyte can achieve an initial discharge capacity of over 176 mAh / g, retain ≥88% capacity after 200 cycles, and exhibit excellent safety performance, making it widely applicable to various solid-state lithium-ion batteries.

The invention discloses a method for balancing the melt overheating temperature and interface reaction of an electromagnetic cold crucible and the electromagnetic cold crucible, belongs to the technical field of electromagnetic cold crucibles, and aims to solve the problem that the existing electromagnetic cold crucible cannot increase the overheating temperature of a metal melt and has negative effects on the integrity of casting and mold filling. According to the method for balancing the overheating temperature and the interface reaction of the melt in the electromagnetic cold crucible, the heat blocking layer is arranged at the bottom of the crucible body, the temperature of the heat blocking layer is regulated and controlled through the water segregator, heat preservation is achieved, meanwhile, the interface reaction of the heat blocking layer is reduced, and the heat insulation effect is improved. Pollution of the heat blocking layer to metal melt is reduced, and it is guaranteed that metal at the bottom of the crucible body is almost in a skull-free state. An electromagnetic cold crucible with a large aspect ratio is placed in an ultrahigh-frequency alternating electromagnetic field, eddy current hot melting metal generated by the ultrahigh-frequency alternating electromagnetic field forms hump-shaped metal melt in the electromagnetic cold crucible, and therefore the contact area between the metal melt and the inner wall of the electromagnetic cold crucible is reduced. The method is mainly used for increasing the melt overheating temperature of the electromagnetic cold crucible.

The present invention provides a composite structure electrode and a preparation method and application thereof, which belongs to the field of electric vehicle power batteries. The composite structure electrode provided by the present invention uses a current collector, a positive electrode active material, a solid electrolyte material, a conductive agent and an auxiliary agent as preparation raw materials, performs an isostatic pressing treatment at a temperature not higher than 600°C, and then coats the solid electrolyte material and the auxiliary agent, and performs a secondary isostatic pressing treatment at a temperature not higher than 600°C in the presence of an auxiliary organic solvent to obtain the electrode. The composite structure electrode provided by the present invention can effectively avoid the reaction of the interface between the oxide electrolyte and the positive electrode active material during the preparation process, and avoid the phenomenon of crystal structure phase transformation when the positive electrode active material is secondary sintered under high temperature conditions.

This invention discloses an electrical graphene-aluminum rod and its preparation method, belonging to the field of materials processing technology. The method includes the following steps: S1, solution treatment and quenching of an Al-Mg-Si alloy to obtain a solution-treated Al-Mg-Si alloy; S2, processing grooves on the surface of the solution-treated Al-Mg-Si alloy, filling the grooves with graphene powder, and performing rotary friction extrusion processing under low-temperature rapid cooling in a cooling medium; S3, performing aging treatment after rotary friction extrusion processing to obtain the electrical graphene-aluminum rod. This invention, using the above-mentioned electrical graphene-aluminum rod and its preparation method, optimizes the process sequence and controls the rotary friction extrusion process, not only ensuring uniform dispersion of graphene in the aluminum matrix and sufficient suppression of interfacial reactions, but also forming ultrafine crystals and extremely fine nano-Mg2Si precipitates in the matrix. The resulting graphene-aluminum rod possesses both high strength and high conductivity.

The application belongs to the technical field of semiconductor material preparation, and relates to a multi-element oxide film and a preparation method and application thereof. In view of the technical problem that the multi-element oxide film is difficult to be prepared uniformly in a large area in the prior art, the application provides a preparation method of the multi-element oxide film, which is prepared by molecular beam epitaxy co-evaporation and comprises the following steps: placing a substrate in a molecular beam epitaxy co-evaporation preparation cavity, and vacuumizing the cavity; sequentially depositing a YSZ buffer layer and a CeO2 buffer layer from bottom to top in the cavity, and obtaining a substrate containing the buffer layers by controlling electron beam automatic evaporation through a film thickness gauge; depositing a YBCO film on the substrate containing the buffer layers by co-evaporating yttrium, copper and barium fluoride, and obtaining a multi-element oxide film with good large-area uniformity by co-evaporating the Y evaporation source, the Cu evaporation source and the Ba evaporation source through the film thickness gauge. The application further provides the multi-element oxide film and application thereof.

The present invention application provides a preparation method of a high-rigidity particle-reinforced aluminum-lithium based composite material, which is applied to the technical field of aluminum-lithium alloys, comprising: mechanically alloying reinforcement phase particles with Zr powder or Sc powder to obtain first reinforcement phase particles; screening the first reinforcement phase particles, and continuing to mechanically alloy with Al powder to obtain second reinforcement phase particles; melting the aluminum-lithium alloy and performing three-stage heat preservation on the aluminum-lithium alloy melt, and adding the second reinforcement phase particles to the aluminum-lithium alloy melt in the second heat preservation stage; the present invention can effectively inhibit the interface reaction between SiC particles and the aluminum-lithium alloy, avoid the generation of brittle Li2C2 and Al4C3, and effectively ensure the strength and rigidity of the aluminum-lithium based composite material, and the three-stage heat preservation process can not only ensure the fluidity of the aluminum-lithium alloy melt, but also avoid the dissolution of the reinforcement phase particles in the high-temperature melt, thereby maximizing the strengthening effect of the reinforcement phase.

The invention discloses a lithium battery diaphragm composite coating based on glass fiber and a preparation method thereof, the lithium battery diaphragm composite coating is prepared by compounding glass fiber and high-component fiber on a common lithium battery diaphragm, the gram weight is 8-16g, the thickness is 10-80mu m, and the porosity is gt; 70%. The glass fibers and the high-component fibers are introduced to a common lithium battery diaphragm, so that the interface reaction between a lithium metal negative electrode and an electrolyte can be effectively inhibited, the generation of an unstable SEI membrane is inhibited, the generation of lithium dendrites in the circulation process is prevented, and the relatively high porosity provides an enough buffer space for the volume expansion of the lithium metal negative electrode, so that the lithium battery diaphragm has the advantages of high stability and high reliability. The cycle performance and the service life of the high-energy-density lithium battery can be improved; the glass fibers and the high-component fibers are compounded, so that the pore size distribution can be effectively controlled, a gain effect on the effects is achieved, and the strength of the composite coating and the binding force of the composite coating and a common lithium battery diaphragm are also improved; and the preparation process is efficient and beneficial to large-scale production.

The application discloses an aluminum-based graphene material and a preparation method, and aims to solve the technical problems of poor interface wettability of graphene and an aluminum matrix, easy agglomeration, secondary agglomeration in a solidification process and difficulty in continuous production. A nano copper coating layer is formed on the surface of graphene through chemical copper plating, so that the interface wettability is improved. The copper-coated graphene powder is uniformly dispersed in an aluminum melt through ultrasonic field and electromagnetic field composite dispersion or synchronous feeding of jet deposition, and then rapid solidification forming is carried out through a Castex continuous casting and extrusion or jet deposition and continuous extrusion integrated process, so that the uniform distribution and densification of graphene in the aluminum matrix are realized. The application is mainly used for high-conductivity and high-strength aluminum-based graphene materials required in the fields of new energy vehicles, 5G communication, rail transit and the like.

The invention discloses a competitive phase dynamics design-based laser in-situ welding method for inhibiting SiCp / Al interface reaction. The competitive phase dynamics design-based laser in-situ welding method comprises the following steps of: fixing a middle layer and SiCp / Al composite materials positioned on two sides of the middle layer; and the SiCp / Al composite material and the middle layer are formally welded through a continuous laser beam. According to the chemical metallurgical performance of the SiCp / Al composite material, design and in-situ laser welding are carried out through the competitive phase kinetic principle between an Al4C3 brittle phase generated through the interface reaction of the material and an intermetallic compound generated through the laser in-situ reaction of a connector, the interface reaction during fusion welding of the SiCp / Al composite material is inhibited, generation of the hard and brittle Al4C3 phase is avoided, and the fusion welding quality of the SiCp / Al composite material is improved. And a high-quality welding joint is obtained.

The invention discloses a transparent sapphire ceramic connecting method based on glass solder, and belongs to the technical field of welding. The method comprises the following steps: preparing glass solder powder from two pieces of sapphire ceramics to be welded according to a route of ball milling, drying, founding, water quenching, ball milling, drying and sieving, pressing the glass solder powder into sheets, and presintering and densifying; placing the glass solder piece between the two pieces of to-be-welded ceramic for assembly; the assembled sample is put into a muffle furnace to be heated to the welding temperature, and rapid cooling is conducted after heat preservation is conducted for a certain time; and the cooled connector is placed in the muffle furnace again for annealing, and then the whole connecting process is completed. The glass solder comprises the following components in percentage by weight: 30%-40% of RE2O3, 5%-10% of Al2O3, 30%-40% of SiO2, 10%-20% of B2O3, 5%-10% of BaO and 5%-10% of K2O. According to the method, the sapphire ceramic joint with high strength and high light transmittance can be obtained.

The application discloses an electrolyte, a secondary battery and a power utilization device, and belongs to the battery field. The electrolyte comprises a first additive, and a chemical structural formula of the first additive comprises a heterocyclic ring and a thiourea group. The electrolyte disclosed by the application can improve the high-temperature storage performance, low-temperature discharge performance and cycle performance of the battery.

The invention provides a solid electrolyte and an application thereof. The solid electrolyte at least comprises a sulfide electrolyte, the coating layer is arranged on the surface of the sulfide electrolyte, and the material of the coating layer comprises lithium carbonate; wherein after the solid electrolyte is exposed in wet air with the dew point temperature of-40 DEG C for 24 hours, the retention rate of the ionic conductivity is 56%-95%. According to the solid electrolyte and the application thereof provided by the invention, the stability of the solid electrolyte to an oxide positive electrode and air can be improved, so that the cycle life, the stability and the safety of a battery are improved.

The invention discloses a lithium tantalate wafer grinding wheel and a preparation method thereof, and relates to the technical field of grinding wheel preparation, the lithium tantalate wafer grinding wheel comprises a lithium tantalate wafer grinding wheel base body and a circular ring block located on the end face of the top of the base body and arranged in the circumferential direction, and the circular ring block forms an abrasive material layer of the grinding wheel; the grinding material layer comprises the following powder raw materials in parts by volume: 18-25 parts of artificial monocrystal diamond powder; 30 to 35 parts of SiC powder; 45-52 parts of copper powder; 7-9 parts of aluminum powder; and 2-4 parts of magnesium aluminum alloy powder. The lithium tantalate wafer grinding wheel effectively solves the problems that when a traditional grinding wheel is machined, the reject ratio is poor, workpieces are prone to being burnt, the machining precision is low, and the service life of the grinding wheel is short.