34 results about "Interfacial reaction" patented technology

This invention belongs to the field of semiconductor optoelectronic device manufacturing technology and discloses a multi-stage annealing process for ITO thin films, including the following steps: Step 1: Under high vacuum protection, the furnace temperature is raised from room temperature to a first temperature T1 and held for a first time; Step 2: The furnace temperature is raised to a higher second temperature T2 and held for a second time, without the need for oxygen introduction during the second holding stage; Step 3: While maintaining the second temperature T2, a third holding stage is performed, and oxygen is introduced during the third holding stage; Step 4: A controllable cooling process is performed, which includes at least a slow cooling stage under the oxygen atmosphere and a rapid cooling stage under an inert gas or extremely low oxygen concentration atmosphere. This invention achieves precise staged control of the ITO thin film crystallization process, oxygen vacancy filling, and interfacial reactions by precisely controlling the oxygen partial pressure and cooling rate at different temperature stages.

The application discloses a brazing filler metal for titanium alloy and stainless steel connection and application thereof, and the brazing filler metal comprises an Ag-Cu eutectic brazing filler metal base and NiTi alloy particles. By introducing the NiTi alloy particles into the Ag-Cu eutectic brazing filler metal base, the Ni and Ti in the interface neighborhood are cooperatively involved in diffusion and reaction, the wetting and forming consistency of the brazing filler metal are cooperatively improved, the interface reaction layer is formed into a discrete thin layer, the continuous brittle reaction layer is inhibited from being generated, the risk of crack propagation along the interface is reduced, the shear strength of the brazing filler metal welding joint for titanium alloy and stainless steel connection is remarkably improved, and the forming quality and batch consistency of the brazing joint are improved.

The application relates to a Y2O3 reinforced graphene / TC4 composite material and a preparation method and application thereof, and belongs to the technical field of graphene / titanium-based composite materials. In order to solve the problem that graphene and a titanium matrix are prone to interface reaction, the structure of graphene is degraded, and the intrinsic strengthening effect cannot be fully exerted, the application provides a Y2O3 reinforced graphene / TC4 composite material component which comprises graphene, Y2O3 and TC4 titanium alloy. The application adopts 0.2-0.4% low graphene addition, combines Y2O3 to construct a multi-level synergistic strengthening network, inhibits excessive interface reaction, protects the intrinsic structure of graphene, realizes efficient load transmission and improvement of strengthening utilization rate. The prepared composite material has excellent strength and plasticity matching, the ultimate tensile strength reaches 1420 MPa, the yield strength reaches 1250 MPa, and the elongation at break is 8.3%. The application has simple and green process, is suitable for batch production, and has important engineering and industrialization value.

The application discloses a kind of silicon carbide particle reinforced aluminum matrix composite and preparation method thereof, for the problem of interface reaction and big thermal mismatch stress easily occurring in selective laser melting (SLM) forming, the preparation method provided by the application comprises: high-temperature oxidation (900-1200 ℃, 2-6 h) is carried out to SiC raw material, so that its corner is passivated and in-situ generates 0.5-3 μm thick amorphous SiO2 continuous layer;Modified SiC particles are mixed with AlSi10Mg alloy powder to obtain composite powder with a SiC volume fraction of 15%-20%;Finally, SLM process is used to scan and melt layer by layer forming.The application uses amorphous SiO2 layer as a physical barrier, effectively inhibits the generation of brittle Al4C3 harmful phase, and significantly buffers the thermal mismatch stress.The method is simple in process, effectively eliminates the stress concentration of particle tip, greatly improves the density and comprehensive mechanical properties of the formed part.

The application discloses a FeTiO3@NaBH4 composite material and a preparation method and application thereof, and belongs to the technical field of water pollution adsorption materials. The preparation steps of the FeTiO3@NaBH4 composite material include the following steps: mixing an iron-titanium ore with sodium borohydride and then ball milling to obtain the FeTiO3@NaBH4 composite material. The application takes the FeTiO3 as a precursor, and constructs a petal-shaped FeTiO3@NaBH4 composite material rich in high-activity sites (Fe 0 , Fe (II)) through NaBH4 ball milling reduction. The FeTiO3@NaBH4 composite material provided by the application contains a large amount of low-valence metal species and defect structures on the surface, and has high interface reaction activity.

This invention relates to the field of electrode materials technology, specifically to a high-entropy layered double hydroxide electrode material, its preparation method, and its application. The electrode material includes a metal substrate and a layered double hydroxide with a high-entropy structure grown in situ on the surface of the metal substrate. The layered double hydroxide consists of a main layer and intercalated anions filling the spaces between the main layers. The main layers include Ni, Co, Fe, Cu, and Al elements, and the intercalated anions are any one of phosphate, carbonate, or dodecyl sulfate. The high-entropy layered double hydroxide electrode material of this invention uses phosphate, carbonate, or dodecyl sulfate intercalation to adjust the interlayer structure, effectively expanding the interlayer spacing of the high-entropy layered double hydroxide to form an interlayer microenvironment more conducive to ion migration and interfacial reactions during electrochemical hydrodechlorination.

The application provides a measuring device and a measuring method for interfacial reaction intrinsic kinetics. The measuring device for interfacial reaction intrinsic kinetics comprises a reaction disc, the reaction disc is provided with a reaction channel, a first liquid inlet channel, a second liquid inlet channel, a first liquid outlet channel and a second liquid outlet channel, the first liquid inlet channel and the second liquid inlet channel are communicated with the inlet of the reaction channel, and the first liquid outlet channel and the second liquid outlet channel are communicated with the outlet of the reaction channel; a centrifugal driving member is connected with the reaction disc to drive the rotation of the reaction disc; a first conveying pump is used for conveying a first fluid to the first liquid inlet channel; a second conveying pump is used for conveying a second fluid to the second liquid inlet channel; a first collecting device is used for collecting the reacted first fluid; and a second collecting device is used for collecting the reacted second fluid. The measuring device for interfacial reaction intrinsic kinetics can decouple the mass transfer and the reaction rate in a heterogeneous reaction, so that the interfacial intrinsic reaction rate is obtained.

This invention belongs to the field of silver-manganese composite material preparation, and provides an efficient method for preparing silver-manganese composite materials. The method uses crypto-potassium manganese dioxide or α-MnO2 tunnel nanorods as a framework. After controllable reduction to construct defects, silver species are impregnated and anchored using a silver-ammonia complex solution. Following drying and air fixation treatment, silver-loaded defective manganese oxide octahedral molecular sieves are obtained. In the resulting material, silver can be stably distributed at surface defect sites and / or 2×2 tunnel opening sites, forming Ag-O-Mn interfaces. This method balances interfacial reactivity, pore structure stability, and low migration and long-term stability of silver species, solving the problem of simultaneously achieving high activity and structural stability, and has good application value.

This invention provides a method for preparing a particle-self-supported oxygen evolution electrode with localized phase transition induced by electro-oxidation. First, an electrochemical deposition technique is used to construct a sheet-like cobalt structure on the surface of nickel foam, forming a three-dimensional conductive framework with a high specific surface area, providing more adsorption sites for subsequent particle loading. Simultaneously, the hydroxyl groups generated from surface hydrolysis participate in subsequent reactions. Second, ultrasonic induction is used to induce a bonding reaction between the carboxyl groups on the surface of the micro / nano particle material and the hydroxyl groups on the substrate surface, strengthening the interaction between them and achieving particle loading on the substrate. Finally, a prolonged electro-oxidation treatment of the particle-loaded electrode stimulates the synergistic effect between the particles and the cobalt electroplated layer, promoting an interfacial reaction that significantly changes the material's microstructure, forming a more robust new phase between the particles and the substrate.

This invention discloses a high thermal conductivity magnesium-diamond composite material and its preparation method, belonging to the field of metal matrix composites. The method includes: roughening the surface of a magnesium or magnesium alloy matrix; preparing a diamond suspension and impregnating the matrix; anchoring diamond particles to the roughened surface of the matrix via ultrasonic embedding; preheating at 250-350℃, followed by hot rolling at 280-320℃ with a deformation of 20%-70%; and finally, stress-relief annealing and finishing. This invention employs a low-temperature solid-state composite process, completely avoiding harmful interfacial reactions between magnesium and diamond; the combination of roughening and ultrasonic embedding ensures uniform dispersion and firm anchoring of diamond particles; and hot rolling achieves dense encapsulation and strong interfacial bonding of the particles. The prepared composite material has a diamond volume fraction of 5%-40%, a thermal conductivity ≥400W / m·K (up to 650W / m·K), and a density ≤2.3g / cm³. 3 Furthermore, the process is simple and the cost is controllable, making it suitable for heat dissipation of high-end electronic devices and easy to mass-produce.

This invention discloses a method for preparing a composite solid electrolyte membrane that inhibits interfacial reactions, comprising the following steps: dissolving a fluorinated polymer and a lithium salt in N,N-dimethylformamide and stirring at 45-55°C to obtain solution A; ball-milling a garnet solid electrolyte to obtain a uniform dispersion, adding bicarbonate and stirring to obtain solution B, wherein the mass ratio of fluorinated polymer, lithium salt, garnet solid electrolyte, and bicarbonate is 0.4:0.6:1:0.15-0.25; adding solution B to solution A and stirring to obtain a uniform electrolyte slurry, transferring it to a glass petri dish, drying it first at 45-50°C with forced air, and then vacuum drying it at 110-120°C to obtain the composite solid electrolyte membrane. This invention introduces bicarbonate to improve the alkaline environment of the garnet solid electrolyte, achieving quantitative control of the interfacial reaction between the fluorinated polymer and the garnet solid electrolyte, and increasing the ionic conductivity to 10. ‑3 S cm ‑1 .

This invention provides a directional thermally conductive copper-based diamond composite material and its preparation method, belonging to the technical field of copper-based diamond composite materials. By constructing a "diamond particle size gradient + aluminum nitride / silicon carbide ceramic gradient," combined with multilayer powder injection molding and segmented vacuum hot pressing, the thermal conductivity and thermal expansion in the thickness direction are synergistically controlled: the upper layer of fine-grained diamond and a small amount of aluminum nitride forms a high thermal conductivity layer, the middle layer of medium-grained diamond and a relatively high amount of aluminum nitride acts as a thermal-mechanical buffer, and the lower layer of coarse-grained diamond and silicon carbide improves the expansion matching and sintering stability of the substrate side; sequential injection combined with interval time and thickness ratio control forms a continuous composition gradient and particle intercalation interface during debinding and densification processes, and through two-step heating, three-stage pressure, depressurization and slow cooling, and medium-temperature heat preservation, densification, interfacial reaction and residual stress release are taken into account, so that the copper-based diamond composite material maintains high thermal conductivity while having an adjustable expansion gradient and high structural reliability.

This invention belongs to the field of battery technology and provides a single-crystal lithium-rich manganese-based cathode material, its preparation method, and its application. The single-crystal lithium-rich manganese-based cathode material includes a matrix core with a basic composition of xLi2MnO3·(1-x)LiMO2, and the matrix core is bulk doped with at least one of W, B, or Ru. A coating layer is disposed outside the matrix core, and the coating layer includes at least one of Li2WO4, Li3BO3, or Li3PO4. This invention constructs a synergistic system of "single-crystallization regulation - bulk doping - surface coating," combining bulk structural stability, interfacial reaction suppression, and battery application adaptation. This facilitates the simultaneous resolution of multiple problems such as structural degradation, interfacial deterioration, and parameter incompatibility, achieving comprehensive optimization of the material's overall performance.

This invention discloses an impact fabrication method for interlayer particle-reinforced composite structures in metals, belonging to the field of composite material preparation and laser processing technology. The method includes: providing a metal matrix and a metal flyer; pre-forming a particle layer on the side of the metal flyer facing the metal matrix; coating an absorption layer and covering it with a constraint layer; irradiating the surface of the flyer with a short-pulse laser to induce high-voltage plasma driving the flyer to impact the matrix at high speed, causing the particle layer to be pressed into the matrix surface, while simultaneously achieving solid-state welding between the flyer and the matrix at the particle gaps to form a particle-reinforced composite layer; repeating the above steps layer by layer to obtain a multilayer particle-reinforced metal matrix composite structure. This invention introduces a particle-reinforcing phase at the metal interlayer interface, achieving uniform distribution and firm embedding of particles, avoiding harmful interfacial reactions, and can prepare multilayer gradient composite structures of the same and different metals. This method has a wide process window and broad material adaptability, applicable to aerospace, electronic packaging, wear-resistant components, and other fields.

The present application relates to the technical field of battery shell production, and particularly relates to a production method of a battery aluminum shell.The present application discloses a production method of a battery aluminum shell, which comprises the following steps: after 6-series aluminum alloy is subjected to melting, degassing, continuous casting and rolling forming, the aluminum alloy is subjected to two-stage ball milling together with zirconium diboride and modified lignin to prepare a composite plate; after pretreatment through alkali washing and acid etching, the plate is coated with a lignin-zinc compound coating and solidified; after preheating, the plate is pulled through a gradient temperature mold to perform hot draw forming, and an interface reaction occurs simultaneously; after laser repair welding of defects, the plate is subjected to preheating, cooling and stabilization heat treatment; finally, the plate is subjected to precise machining such as milling and polishing to obtain a finished product.The present application can make the aluminum shell have stable microstructure and optimized interface bonding, excellent mechanical properties and corrosion resistance by means of phase composite, gradient coating and heat treatment regulation, and the process is controllable, so the present application is suitable for large-scale production of battery aluminum shells.

This application discloses a method for fabricating a high-power ceramic capacitor and the ceramic capacitor itself. The method includes: constructing discretely distributed interface microstructure units on at least one surface of a pre-fabricated ceramic substrate layer, wherein each interface microstructure unit is a local structure with a height difference and / or composition difference relative to the surface of the ceramic substrate layer, used to define spaced-apart reaction-triggered regions and non-triggered regions; activating the surface of a pre-fabricated metal electrode layer to give it interfacial activity that preferentially reacts with the interface microstructure units; stacking the metal electrode layer and the ceramic substrate layer, with the interface microstructure units located at the contact interface, forming a stacked structure; heat-treating the stacked structure to preferentially induce interfacial reactions in the reaction-triggered regions, forming reaction bonding regions; and post-processing the heat-treated stacked structure to obtain the ceramic capacitor.

This invention discloses a non-equimolar ratio high-entropy rare-earth zirconate ceramic and its composition design and preparation method. Based on the CMAS corrosion response behavior of single rare-earth zirconate ceramics, rare-earth elements are classified into interface stabilizers for forming a dense interfacial reaction layer and crystal resists for enhancing lattice stability. The ratio of these two elements is then directionally controlled to design a non-equimolar ratio high-entropy rare-earth zirconate ceramic material, chemically represented as (RE1...). a RE2 b 2Zr₂O₇. During preparation, rare earth oxides and zirconium oxide powder are weighed according to stoichiometric ratios, and then sequentially ball-milled, calcined, granulated, cold-pressed, and sintered to obtain a dense ceramic material. This invention overcomes the blind spots of traditional equimolar ratio design. The non-equimolar ratio high-entropy rare earth zirconate ceramic material designed and prepared exhibits significantly better CMAS corrosion resistance than existing equimolar ratio high-entropy rare earth zirconate ceramic systems, and has broad application prospects in the field of thermal barrier coatings.

The application belongs to the technical field of chemical synthesis, and discloses a microfluidic droplet-Raman combined two-phase reaction synthesis system screening chip system and method, which is composed of a microfluidic droplet two-phase reaction chip and a droplet bearing chip, and the microfluidic droplet two-phase reaction chip comprises four solution adding areas, two droplet generating areas, two droplet mixing areas, a droplet balancing area, a droplet fusion area and corresponding sample inlets and outlets; the droplet balancing area connects all parts in the chip, balances pressure, and enables the droplets to reach and fuse simultaneously; the fused droplets reciprocate in the mixing reaction area, the reagents in the droplets are mixed and two-phase interfacial reactions occur; the reaction droplets are guided out of the chip outlet, added dropwise to the droplet bearing chip, and further combined with external Raman spectrum detection. The droplet bearing chip comprises a droplet bearing micropit array, the overall size is adapted to the Raman spectrum carrier table, and a precise control and high-throughput screening method is provided for screening two-phase organic reaction paths.

This invention discloses an in-situ small-molecule encapsulated COF composite membrane for ion-selective separation, its preparation method, and its application. The preparation method includes: immersing a porous membrane in an organic phase containing trialdehyde compounds, then removing it and contacting it with an aqueous phase containing COF monomers and functional small molecules to undergo an interfacial reaction; or, immersing the porous membrane in an organic phase containing trialdehyde compounds and COF monomers, then removing it and contacting it with an aqueous phase containing functional small molecules to undergo an interfacial reaction, thereby obtaining the in-situ small-molecule encapsulated COF composite membrane for ion-selective separation. This invention proposes a "one-step in-situ interfacial polymerization + functional small molecule encapsulation" strategy for constructing COF composite membranes. This technical solution utilizes the pore formation window during the COF film formation process to achieve in-situ simultaneous encapsulation of ion-affinity functional small molecules, controlling ion migration paths, thereby achieving a balance between high selectivity and high throughput in ion separation.

The present application relates to the technical field of high-performance coating, in particular to an inorganic corrosion-resistant coating and a preparation method thereof.The present application overcomes the problems of poor corrosion resistance and poor thermal insulation performance of inorganic coatings.The present application obtains a composite silicate binder by mixing potassium silicate and lithium silicate, forming a dense and stable three-dimensional crosslinked network structure;obtains a thermal insulation filler by coating metal silver on the surface of hollow glass microspheres and compounding with silica aerogel, synergistically constructing a multiple thermal insulation mechanism of "reflection, blocking and inhibition";obtains a composite shielding filler by mixing a flaky filler and a two-dimensional nanosheet filler, the two forming a complementary spatial blocking structure, reducing the probability of contact between the corrosion medium and the substrate, and the flaky structure also enhancing the density of the coating;by adding an interface in-situ passivation agent, a passivation protective film can be formed at the interface between the filler and the binder, avoiding corrosion caused by interface reaction between the filler and the substrate.

This invention discloses a titanium-magnesium composite material, its preparation method, and its applications, relating to the field of metal composite materials technology. It includes a titanium base layer, a magnesium base layer, and an aluminum connecting layer located between the titanium and magnesium base layers. By setting an aluminum connecting layer between the titanium and magnesium base layers, aluminum exhibits good metallurgical compatibility with both titanium and magnesium, enabling sufficient atomic diffusion and interfacial reactions to occur during hot rolling. This forms a stable metallurgical bonding interface between titanium and magnesium, effectively solving the problem of direct titanium-magnesium composite material composition and obtaining a titanium-magnesium composite material that combines lightweight and high strength.

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.

This invention discloses a sodium sulfate / crystallized carbon nitride composite material, comprising a crystallized carbon nitride matrix and Na2SO4 intercalated therein, wherein the Na2SO4 is mainly intercalated on the (002) crystal plane of crystallized g-C3N4. This invention utilizes Na2SO4 to regulate the crystallization of g-C3N4 and modify it through salt intercalation. During the preparation of the composite photocatalytic material, the introduced Na2SO4 can act as a denitrification condensation reaction site during high-temperature calcination, accelerating the conversion of melamine to g-C3N4 and promoting the formation of crystallized g-C3N4 with ordered internal unit arrangement. Simultaneously, the Na2SO4 salt itself intercalates into the crystallized g-C3N4 structure, serving as an interfacial reaction site to optimize the oxygen reduction to H2O2 reaction kinetics, significantly enhancing photocatalytic activity. The preparation method of the composite material described in this invention is simple and environmentally friendly, providing a new approach for the preparation of high-performance photocatalytic carbon nitride materials.

This invention discloses a method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide, belonging to the field of metal composite materials. The method includes: surface pretreatment, intermediate layer coating, titanium plate surface oxidation treatment, billet preheating, hot rolling composite, and post-rolling annealing. This invention utilizes magnesium oxide powder and the titanium oxide layer as diffusion barrier layers and interfacial reaction layers. During hot rolling, high temperature and large deformation achieve strong metallurgical bonding and mechanical interlocking at the interface, suppressing the formation of harmful brittle phases and avoiding defects such as interfacial cracking and delamination caused by brittle phase aggregation. Unlike traditional preparation methods, the preparation method described in this invention is simple and can achieve high interfacial strength at relatively low pressure. After annealing, the interfacial strength and the toughness of the composite plate can be further improved, providing an effective way to prepare high-performance titanium-magnesium layered composite materials.

This invention relates to a brazing filler metal for air reactive brazing of zirconia ceramics and iron-based alloys, its preparation method, and its applications, belonging to the field of materials welding. The invention aims to address the problem of continuous brittle composite oxide layers easily formed during existing air reactive brazing processes of zirconia ceramics and iron-based alloys. The brazing filler metal of this invention is composed of Ag, CuO, and TiO2. Utilizing the synergistic effect of Ag, CuO, and TiO2, the brazing filler metal effectively controls the interfacial reaction process and inhibits the formation of continuous brittle oxide layers on the iron-based alloy side. Air reactive brazing avoids the problem of blackening on the ceramic side of the joint after brazing with active metals, ensuring a good interfacial bond between the zirconia ceramic and the iron-based alloy, and obtaining a high-quality brazed joint with excellent sealing performance and stable mechanical properties. The brazing filler metal of this invention has a uniform composition, is easy to assemble, and allows for precise control of the brazing weld width, showing promising prospects for engineering applications.

This invention relates to the field of electrochemical technology, and more particularly to a method for testing the reaction kinetics at the Bi electrode interface in Li-Bi batteries. The dual-probe measurement system constructed in this invention works collaboratively on a precise three-dimensional positioning platform of a shared scanning electrochemical microscope. One probe maps the electrochemical activity distribution on the electrode surface, visually reflecting the spatial location of low-activity phases, while the other Hg probe simultaneously records the Li content in the corresponding region. + Concentration or diffusion coefficient. This "functionally complementary, spatially synchronized" measurement mode can integrate observed electrochemical data, interfacial electrochemical activity, and Li... + The migration dynamics are directly related, thus providing experimental evidence for revealing the true rate-limiting steps in the phase transition process, enabling a more comprehensive and three-dimensional analysis of complex electrode processes, and making up for the limitations of single signal measurement.

This application provides a method for preparing a bio-based polyarylate, belonging to the field of high-performance polymer technology. The method involves dissolving guaiacol in an alkaline aqueous solution to obtain an aqueous phase system; dissolving 2,5-furandicarboxylic acid chloride in an organic solvent to obtain an oil phase system; under stirring, the oil phase system is slowly added to the aqueous phase system, controlling the reaction temperature and time. After the interfacial reaction is completed, the mixture is separated, washed, and dried to obtain a bio-based polyarylate with a glass transition temperature of 120–180 °C, a number-average molecular weight of 30,000–80,000 g / mol, and a tensile strength of 60–90 MPa. The bio-based polyarylate prepared by this method exhibits advantages such as good stability and excellent mechanical properties.

This invention discloses a method for enhancing reactive polystyrene / nylon interfaces using different nanomaterials, belonging to the field of polymer interface modification. The method uses maleic anhydride-grafted polystyrene (SMA) and PA6 as the base system, selecting MXene or POSS. 101 Nanomaterials were used as interface compatibilizers. Bilayer thin film samples were prepared by spin coating, and bulk samples were prepared by hot pressing, followed by heat treatment at 180-240℃ for 15-300 min. MXene utilizes surface -O, -F, and -OH groups to provide reaction sites, POSS... 101 Interfacial interactions were enhanced through physical-assisted and chemical mechanisms by the participation of epoxy groups in the interfacial reaction. After treatment, the MXene system exhibited a shear strength of 2.6 MPa and a POSS (Positive Stress Index) of [missing information - likely related to heat treatment at 200℃ for 2 hours]. 101 The system has a simultaneous shear strength of 4.5 MPa, which can effectively improve the interfacial properties of SMA / PA6 and is suitable for the preparation of high-performance polymer composite materials.

The application discloses a method for optimizing Cu / Al brazing interface structure, comprising the following steps: pretreating a base material, coating a brazing agent on a to-be-welded area of the base material surface, filling Zn-Al filler material containing a nickel element, heating the base material, making the filler material melt, carrying out interface reaction, and controlling the interface reaction time to be 3s-20s; after the interface reaction is completed, controlling the cooling rate to be not less than 80 DEG C / s, and cooling the joint to room temperature to complete the optimization of the brazing interface structure. According to the method, a new double-layer composite structure can be constructed at the interface by introducing the nickel element and adopting a two-stage non-equilibrium thermodynamic control strategy of ''very short time limited reaction + very large supercooling degree rapid cooling'', brittle fracture is changed into high-toughness mixed fracture, the interface brittle phase is inhibited from being coarsened and decomposed, and the mechanical reliability and service life of the joint under long-term high-temperature service are improved.

The application provides a liquid metal composite porous foam metal thermal interface material and a preparation method thereof, and comprises the following steps: S1, a low-melting-point metal component is heated and smelted to obtain a liquid metal; S2, the foam metal is pickled and immersed in an interface modifier to obtain a modified surface of the foam metal; and S3, the liquid metal is covered on the modified surface, so that the liquid metal is immersed in the internal pores of the foam metal, and the liquid metal composite porous foam metal thermal interface material is obtained. The modified surface is constructed on the surface of the foam metal through pickling and immersion treatment of the interface modifier, the modified surface can effectively slow down the interface reaction between the liquid metal and the foam metal, inhibit the generation of intermetallic compounds, and thus avoid material embrittlement and deterioration of the thermal conductivity caused by continuous interface reaction.