149 results about "Interfacial reaction" patented technology

The invention relates to a germanium telluride-based thermoelectric element and a preparation method thereof, and the thermoelectric element has a three-layer sandwich structure, specifically an interface barrier layer, a germanium telluride-based thermoelectric layer and an interface barrier layer. The material of the interface barrier layer is Fe3Ni, FeNi3 or FeCoNi. The germanium telluride thermoelectric element has low interface resistance, the interface structure formed by sintering is reliable and good in stability, interface reaction is effectively inhibited, high conversion efficiency of the thermoelectric element is facilitated, long-term service stability is guaranteed, and the germanium telluride thermoelectric element is simple in preparation method, low in cost and good in practicability.

The invention discloses a silicon carbide / silicon dioxide hybrid reinforced aluminum-based composite material and a preparation method thereof.The performance of the silicon carbide reinforced aluminum-based composite material is improved through low-density and low-expansion-coefficient silicon dioxide, and the wettability of silicon carbide and an aluminum alloy matrix can be improved by adding the silicon dioxide; and the thermal expansion coefficient of the aluminum-based composite material can be further reduced. According to the method, the aluminum alloy powder is obtained by adopting an aerosol method, and the high-energy ball milling method and the hot isostatic pressing sintering process are combined, so that the composite powder is formed under uniform pressure and lower temperature, an AlC3 brittle phase generated by harmful interface reaction is avoided, the compactness of the aluminum-based composite material can be greatly improved, and the service life of the aluminum-based composite material is prolonged. The problems that an aluminum alloy matrix containing silicon carbide reinforced particles is poor in wettability and poor in size stability under the condition that the temperature changes drastically are solved.

The invention discloses an intelligent evaluation method for coating adhesion of a hot-dip galvanized steel pipe, and relates to the technical field of intelligent quality control of galvanized steel pipes, and the method comprises the following steps: constructing a galvanization process time sequence multi-dimensional data set by fusing static attributes of a steel pipe, time sequence process parameters of a galvanization production process and coating thickness measurement data; based on an improved signal volatility analysis method, interface reaction dynamic characteristics and cooling process dynamic characteristics are extracted; implicit microstructure features are generated through a feature cross structure guided by material science and physical information; and realizing continuous numerical prediction and grade probability output of the adhesion of the plating layer by using the implicit space representation regression model based on the antagonistic auto-encoder. According to the method, interpretable mapping between the microstructure and the coating adhesive force in the galvanization process is achieved, the coating adhesive force prediction accuracy and evaluation reliability are improved, and a decision basis can be provided for process adjustment and quality risk pre-control in the production process.

The invention discloses equipment and a method for preparing an aluminum silicon carbide (Al-SiC) composite material through a pressure infiltration process, and belongs to the technical field of metal matrix composite material preparation. The efficient pressure preparation equipment for the aluminum-silicon carbide composite material comprises a furnace body, a lower graphite crucible, an upper graphite crucible, a liftable graphite rod, an inflation connector and an exhaust connector, during specific use, an aluminum ingot and a silicon carbide preform are heated respectively and prevented from making contact with each other, so that the interface reaction strength is relieved, and combination of aluminum and silicon carbide is facilitated; after the target temperature is reached, the graphite rod is lifted to open the leak hole, so that the molten aluminum falls into the lower graphite crucible, and under the action of high-pressure gas, the molten aluminum is infiltrated into the silicon carbide prefabricated body, so that the aluminum-silicon carbide composite material is prepared; the problems of low density, poor process stability, violent interface reaction and low bonding strength in the prior art can be solved.

The invention discloses a high-entropy alloy wear-resistant coating with a silicon-containing transition layer for improving the wettability of a copper surface and a laser cladding method, and relates to the technical field of alloy coatings. The method comprises the following steps: providing silicon-containing transition layer alloy powder and CoCrFeNiTi series high-entropy alloy powder; providing a copper base material, and cleaning the surface to be cladded of the copper base material; cladding silicon-containing transition layer alloy powder on the surface of the copper base material by adopting a laser cladding process under a protective atmosphere to form a silicon-containing transition layer; and under the protective atmosphere, CoCrFeNiTi series high-entropy alloy powder is cladded on the surface of the silicon-containing transition layer through a laser cladding process, and the high-entropy alloy wear-resistant coating is formed. According to the high-entropy alloy coating disclosed by the invention, the Si element in the transition layer can be subjected to interface reaction with a copper substrate to form a Cu-Si solid solution phase with low interface energy, so that the interface tension between copper and a subsequent cladding coating is remarkably reduced, and the wettability between the copper substrate and a coating material is fundamentally improved; the high-entropy alloy coating is successfully cladded on the copper surface with poor wettability.

The invention discloses a dispersion distribution method for a micro-nano multi-scale mixed SiC particle reinforced phase in an aluminum-based composite material and the composite material, and relates to the technical field of metal-based composite material preparation. The method comprises the following steps: firstly, carrying out ultrasonic cleaning, ultrasonication and two-stage high-temperature oxidation treatment on SiC particles, and generating an oxidation film on the surfaces of the particles; ball-milling and mixing the treated micron and nano SiC particles and micron pure magnesium particles according to a specific proportion, and pressing into a precast block; then preparing an aluminum alloy melt, cooling to a solid-liquid two-phase region, carrying out semi-solid stirring, and adding the preheated precast block; and finally, raising the temperature to be above a liquidus, rewarming, stirring and molding by casting. Through the synergistic effect of ultrasonic physical dispersion, high-temperature oxidation surface modification and magnesium-induced semi-solid stirring, the problems that micro-nano particles are prone to agglomeration, wettability is poor and interface reaction is difficult to control are effectively solved, multi-scale uniform dispersion distribution of a reinforced phase in an aluminum matrix is achieved, and the comprehensive performance of the composite material is remarkably improved.

The invention relates to the technical field of iron phosphate production, in particular to a production process and equipment for preparing iron phosphate based on an oxygen micro-interface reaction gas oxidation method and iron phosphate. The micro-nano bubble oxygen is used for replacing hydrogen peroxide to serve as an oxidizing agent, so that the production process of iron phosphate is optimized, and the reaction efficiency and the product quality are remarkably improved. The special property of the micro-nano bubble oxygen enables the micro-nano bubble oxygen to effectively improve the mass transfer efficiency and the reaction rate of the oxygen under the conditions of higher temperature and lower concentration, so that the efficient oxidation of ferrous in the raw material and the crystal form control of ferric phosphate are promoted. Oxygen is injected into the reaction liquid and forms superfine bubbles through the micro-nano bubble generator, so that the oxygen solubility and the reaction speed at a gas-liquid phase interface are enhanced. The oxygen generator is used for uniformly distributing bubbles in the whole reaction system by precisely controlling the gas flow and the bubble size, so that the uniformity and efficiency of the reaction are ensured.

The invention discloses an efficient mineral selective flotation reagent and application thereof, and aims to improve the selectivity and recovery rate of mineral flotation. The composition comprises a first precursor (P1), a second precursor (P2), and a resonance activation adjuvant (Aux). The first precursor P1 has an anchoring group capable of acting on the surface of a target mineral and a first reactive functional group; the second precursor P2 includes a hydrophobic group and a second reactive functional group capable of a ligation reaction with the first reactive functional group of P1. The application method comprises the following steps: adding P1 and Aux into ore pulp to react with minerals; and applying an external energy field (such as ultrasonic wave or illumination with specific wavelength) to activate P1 and Aux adsorbed on the surface of the mineral. Through an in-situ interface reaction strategy assisted by an external energy field, directional adsorption and effective coverage of the agent on the surface of the mineral are remarkably improved, flotation dynamics is improved, flotation requirements of different mineral types can be met, and a new technical approach is provided for efficient utilization of complex and refractory ores.

The invention discloses a graphene reinforced Al-Cu composite material and a preparation method and application thereof, and belongs to the technical field of metal matrix composite materials and preparation thereof. The problems that in an existing graphene reinforced aluminum matrix composite, graphene is poor in dispersity in an aluminum matrix, and harmful interface reaction is serious at the high temperature are solved. According to the preparation method, the surface of aluminum powder is plated with nano-copper particles through chemical plating, the potential of the aluminum powder in a water medium is regulated and controlled through a copper plating layer on the surface, the surface of the aluminum powder is provided with positive charges, graphene can be evenly dispersed in a matrix through electrostatic self-assembly, and meanwhile the surface copper plating layer is used for inhibiting interface reaction and hindering generation of a brittle phase. In addition, by adding the metal copper, the solid solution and second phase strengthening effects can be achieved, and the mechanical property of the composite material is further improved.

The invention discloses a preparation method of a graphene reinforced 2024Al composite material (Gr / 2024Al) with a three-dimensional network structure, and relates to a preparation method of a metal composite material. The invention aims to solve the following problems: 1, the structural integrity of graphene treated by a ball milling method is seriously damaged to cause poor interface reaction; and 2, the graphene subjected to ball milling treatment is high in energy, so that solute atoms are not uniformly dispersed, and negative effects are generated on the subsequent aging behavior and the mechanical property of the material. The preparation method disclosed by the invention comprises the following steps: 1, preparing GO-2024Al composite powder by an electrostatic self-assembly method; secondly, a Gr / 2024Al composite material is prepared through a hot pressing sintering method; and thirdly, the Gr / 2024Al composite material is subjected to solid solution aging heat treatment, and the mechanical property of the Gr / 2024Al composite material is further improved. The graphene reinforced 2024Al composite material with the three-dimensional network structure has the following characteristics that 1, the graphene structure is complete, and the graphene is uniformly dispersed in an aluminum matrix; 2, the graphene / aluminum matrix interface is combined cleanly and tightly; and 3, the mechanical property of the composite material is high.

The invention discloses a graphene / aluminum alloy composite material with high conductivity and a preparation method thereof, and belongs to the technical field of metal-based composite materials. And the electric conductivity is not lower than 70% IACS. The preparation method comprises the following steps: carrying out surface copper plating pretreatment on aluminum alloy powder; performing ultrasonic dispersion on graphene by using a polyvinyl alcohol solution to obtain a stable dispersion liquid; mixing, stirring, drying and filtering the copper-plated powder and the graphene dispersion liquid to obtain graphene-coated composite powder; and finally, carrying out rapid densification sintering by adopting a spark plasma sintering technology. The core innovation point of the preparation method is that the problem of dispersion and interface combination of graphene in an aluminum matrix is solved synergistically through combination of a copper plating transition layer and PVA auxiliary dispersion-adsorption coating, then interface reaction is avoided through SPS rapid sintering, finally, the composite material with excellent conductivity is obtained, and the technical index reaches the domestic leading level.

The invention relates to the technical field of metal material connection and surface engineering, in particular to MAB phase reinforced Cu-Sn-Ti active brazing filler metal and a preparation method thereof. According to the MAB phase enhanced Cu-Sn-Ti active brazing filler metal, an MAB phase serves as a strengthening phase and is layered ternary boride ceramic, M is Mo or Cr, A is Al, and the brazing filler metal comprises, by mass, 60%-65% of Cu powder, 15%-18% of Sn powder, 10%-12% of Ti powder and the balance MAB powder. The MAB phase ceramic with a unique layered structure and chemical activity is introduced, the interface reaction of a diamond / steel substrate can be actively regulated and controlled while dispersion strengthening of the brazing filler metal substrate is achieved, a tough and tough combined gradient interface is formed, and therefore the diamond composite wear-resistant coating with excellent comprehensive performance is obtained.

The invention discloses a method for diffusion bonding of titanium alloy and stainless steel by using an intermediate layer, which is characterized in that a layer of Ta material and a layer of Ag material are sequentially arranged between a titanium alloy workpiece and a stainless steel workpiece as the intermediate layer, and diffusion welding is realized by heating and pressurizing. The method is applied to diffusion welding connection between Ti alloy and stainless steel, and the problems of brittle phase generation, residual stress concentration, insufficient connection strength and the like caused by large thermal expansion coefficient difference and high interface reaction activity of dissimilar materials can be effectively solved. And the connection residual stress can be better reduced, the connection strength is improved, and the joint interface quality and the overall mechanical property are improved.

The invention discloses a 3D printing photocuring forming method for a silicon nitride ceramic framework, and belongs to the technical field of advanced ceramic additive manufacturing. According to the 3D printing photocuring forming method for the silicon nitride ceramic framework, the silicon nitride framework containing a communicating hole array and a special-shaped supporting structure can be prepared through the DLP photocuring technology and customized slurry, the efficient infiltration requirement of a multiphase ceramic matrix is met, and the manufacturing efficiency is improved. The powder dispersity is improved through modification of a silane coupling agent, resin residues are thoroughly removed through cooperative control of a low-shrinkage resin system, segmented exposure, gradient degreasing and sintering, interface reaction with a complex-phase matrix at high temperature is avoided, stable complex-phase performance is guaranteed, layering does not exist after standing is conducted for 24 h through customized slurry, the process stability is extremely high, and the method is suitable for industrial production. Therefore, the problems of single skeleton structure, low dimensional precision and high impurity content in the prior art are solved, a complex three-dimensional pore structure can be prepared, the process stability is high, and the method is suitable for batch production and meets the requirements of multiple scenes such as high-temperature structural parts and multiphase ceramic reinforcement bodies.

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.

This invention discloses a highly collapsible ceramic core with a dense outer surface and a porous core, and its preparation method. The ceramic core is composed of a porous core ceramic core and a densified inert coating on its outer surface. The porous core ceramic core comprises 42-51 wt% ceramic powder, 35-40 wt% hollow glass microspheres, 4-9 wt% fiber, 3-7 wt% graphite, and 2-8 wt% starch. The densified inert coating comprises 67-75 wt% sol and 25-33 wt% nanoparticles. The preparation method includes the following steps: preparing a porous core ceramic core and a densified inert coating slurry; impregnating the porous core ceramic core with the densified inert coating slurry under segmented vacuum pressure using a gradient pressure reduction method; and then sintering it in a heat treatment furnace. The ceramic core prepared by this invention exhibits excellent collapsibility, which can solve the problem of blade thermal cracking. The inert coating avoids interfacial reactions, and the porous core structure facilitates efficient core removal.

The invention relates to the technical field of chute lining plates, and discloses a high-wear-resistance chute lining plate and a preparation method thereof.The high-wear-resistance chute lining plate comprises a chute lining plate body, and the chute lining plate body comprises a ceramic layer and a buffer layer; in the ceramic layer, a matrix is prepared from 35wt% of alpha-Al2O3, and a toughening phase is prepared from 7wt% of zirconium oxide whiskers and 4wt% of TiCN nanoparticles; the buffer layer is hydrogenated butadiene-acrylonitrile rubber, and the acrylonitrile content is 34%. According to the preparation method disclosed by the invention, through a three-stage technical route of component gradient design, gel precision forming and interface reaction regulation and control, strengthening and toughening, high-temperature performance optimization and multi-scale enhancement of the alumina-based ceramic are realized: macro-scale (zirconia whisker) + mesoscale (TiCN nanoparticles) + micro-scale (NiCr metal phase) cross-scale synergy is realized; and in-situ reaction: vacuum sintering at 1850 DEG C is utilized to trigger TiCN / NiCr interface reaction, a TiC-NiCr metal ceramic transition layer is generated, and the mechanism compressive strength is improved through a metal ceramic composite material, so that the chute lining plate has better impact resistance and wear resistance effects.

The application discloses a brazing method for improving interface reaction of composite filler metal self-adapting high-entropy ceramics, which comprises the following steps: firstly, uniformly mixing filler metal powder and high-entropy ceramic powder, adding anhydrous ethanol and grinding balls, ball milling to a slurry state, and obtaining a composite slurry; drying the composite slurry to obtain a composite filler metal, wherein the high-entropy ceramic particles in the composite filler metal account for 2-6 wt% of the total mass of the composite filler metal; then, mixing the composite filler metal with an adhesive and coating the mixture on a to-be-welded surface of a high-entropy ceramic block, and forming a to-be-brazed structure after adhesion; finally, heating the to-be-brazed structure to a brazing temperature according to a process curve, melting the composite filler metal to form a liquid phase, preferentially causing in-situ reaction of the first active element in the composite filler metal and the high-entropy ceramic particles, consuming part of the first active element, and enriching the remaining first active element and / or the second active element in the liquid filler metal on the surface of the high-entropy ceramic block and inducing interface reaction, and obtaining a high-entropy ceramic brazed joint after holding at the brazing temperature for a period of time and cooling. The method avoids the problem that high activity of the first active element in the commercial filler metal causes severe dissolution of the high-entropy ceramic matrix, and the joint strength is increased by more than 24%.

The invention discloses a high-impact-toughness titanium carbonitride-based metal ceramic alloy with a dispersed distribution micro-nano bicrystal structure and a preparation method of the high-impact-toughness titanium carbonitride-based metal ceramic alloy. The metal ceramic alloy comprises hard-phase powder, hard-phase powder and hard-phase powder, and the hard-phase powder comprises TiCN powder, TiC powder and WC powder; the bonding phase powder comprises Fe powder, Ni powder and Co powder; and a carbon and nitrogen balance powder, wherein the carbon and nitrogen balance powder comprises a carbon-containing Mo-Fe powder. A metal ceramic matrix of a micro-nano bicrystal structure is constructed on the microstructure, and a multi-stage, high-density, uniform and fine nano structure is separated out by utilizing the dispersion characteristic and interface reaction of nano composite powder; the Ti (C, N)-based metal ceramic with the strengthened and toughened micro-nano bicrystal structure is prepared through a powder metallurgy technology and a nitrogen partial pressure sintering process by combining interface regulation and control mechanisms of different doping elements and based on the combined action of mechanisms such as fine grain strengthening and second phase strengthening, and the bonding strength between metal ceramic matrix phase interfaces is improved.

The invention discloses a preparation method of a SiC whisker reinforced niobium-based composite material, which comprises the following steps: 1) performing high-energy ball milling treatment on SiC whiskers and niobium alloy powder according to a formula ratio to obtain niobium alloy-SiC whisker composite powder; (2) forming and printing the niobium alloy-SiC whisker composite powder by adopting a laser directional energy deposition technology to obtain a SiC whisker reinforced niobium-based composite material; the method further comprises the step that the SiC whisker reinforced niobium-based composite material obtained in the second step is subjected to heat treatment. According to the method, impurity pollution in the ball milling process is avoided by adopting the agate ball milling tank, and alternate rotation is performed by adopting planetary ball milling, so that the risk of whisker breakage is reduced while uniform mixing of SiCw and niobium alloy matrix powder is ensured; and in combination with the rapid solidification characteristic of laser directed energy deposition (L-DED), whisker agglomeration and interface reaction are effectively inhibited, the high survival rate of SiCw in a niobium alloy matrix and tough interface construction are achieved, and then the mechanical property of the composite material is effectively improved.

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 method, system and device for analyzing relaxation time of impact energy release of an energetic material, wherein the method comprises the following steps: establishing a diffusion control equation of the energetic material on a hit target; obtaining an atomic diffusion contribution item for characterizing an atomic diffusion rate based on the diffusion control equation and a reaction product layer; obtaining an interface reaction contribution item for characterizing an interface reaction rate based on a standard Avrami equation; analyzing a reaction degree of the energetic material by the atomic diffusion contribution item and the interface reaction contribution item, so as to obtain the relaxation time of the impact energy release of the energetic material. Through the application, a coupling mechanism of interface reaction and atomic diffusion at a microscale is realized, the coupling mechanism can be used for effectively analyzing the impact energy release of the energetic material, the prediction precision of the impact energy release relaxation time is improved, a reliable basis is provided for engineering design of the energetic material, and the problem of how to improve the calculation precision of the impact energy release relaxation time of the energetic material is solved.

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 present invention discloses a micro / supergravity-microinterface jet-type self-rotating reaction device for enhancing the catalytic hydrogenation of heavy turpentine / resin oil. The reaction device comprises: a heat exchanger; a super / microgravity-microinterface reactor disposed within the heat exchanger; and a fluid conveyor, wherein the material inlet is connected to the fluid conveyor. Also disclosed is a method for using the micro / supergravity-microinterface jet-type self-rotating reaction device for enhancing the catalytic hydrogenation of heavy turpentine / resin oil. The present invention utilizes the self-rotating circular flow of the materials participating in the reaction within the reaction device to generate centrifugal force, thereby overcoming gravity to form a super / microgravity-microinterface field, thereby causing the heterogeneous reaction materials to form millimeter- or micrometer-sized droplets and bubbles. The collective scale of the gas-liquid and gas-liquid-liquid interfaces is efficiently controlled from the milli-centimeter level to the micrometer level, effectively promoting interphase mixing and enhancing the transfer process of the heterogeneous reaction materials.

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 invention relates to a preparation method of a graphene / metal composite material, in particular to a preparation method of a needle-shaped interface graphene / metal composite material. In order to solve the problems that an existing graphene / metal composite material has a weak interface and harmful interface reaction is likely to happen, a needle-shaped interface phase is constructed in situ between graphene and a metal matrix, the needle-shaped interface phase is a needle-shaped interlocking interface, the load transmission efficiency is improved through mechanical anchoring, and the mechanical performance of the graphene / metal composite material is improved. The needle-shaped structure can effectively resist shear stress and interface slippage, so that the bearing capacity and the stability of the interface are greatly improved, and the strength far higher than that of a flat and straight interface composite material is obtained. And continuous work hardening is provided through subsequent induction of dislocation proliferation and pinning dislocation. The method is used for various metals such as aluminum, magnesium, copper and titanium and alloy systems thereof, and has universality.

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.

The invention relates to a ceramic-metal brazed joint with a nanocrystalline interface reaction layer and a preparation method and application of the ceramic-metal brazed joint, and belongs to the technical field of heterogeneous material connection. The invention discloses a ceramic-metal brazed joint with a nanocrystalline interface reaction layer. The ceramic-metal brazed joint comprises a ceramic matrix, a metal matrix, an active brazing filler metal layer and a nanocrystalline structure layer, wherein the active brazing filler metal layer is used for connecting the ceramic matrix and the metal matrix, and the nanocrystalline structure layer grows in situ between the active brazing filler metal layer and the ceramic matrix. According to the nanocrystalline reaction layer disclosed by the invention, the interface bonding strength and the thermal shock resistance of the joint are remarkably enhanced through a fine grain strengthening and toughening mechanism in combination with the structural isotropy of the nanocrystalline reaction layer, and the excellent sealing reliability of the joint in a severe environment is ensured; the method is suitable for aerospace thermal protection, high-power electronic device packaging and preparation of high-temperature and high-pressure sensor sealing components.

The invention relates to the technical field of metal-based composite material preparation and processing, in particular to a low-interface reaction metal-based composite material preparation method based on powder solid-phase deposition additive, which comprises the following steps: mixing nano or micron reinforced phase particles with metal matrix powder to form composite powder; then, friction heat between the rotating tool and the substrate / deposited layer serves as a unique external heat source, powder solid-phase deposition material adding is conducted under the condition that the temperature is lower than the melting point of the metal matrix, and contact type forced cooling is conducted on a deposition area in the process; the thickness of a composite material interface reaction layer is controllable by cooperatively controlling the rotating speed, the axial pressure, the radius of a shaft shoulder and the moving speed of a tool, and finally the thickness of the composite material interface reaction layer is smaller than or equal to 30 nm, the room-temperature tensile elongation at any position is larger than or equal to 3%, and the material density is larger than or equal to 99%. The density and plasticity index of the material are ensured, and the interface reaction between a reinforced phase and a matrix is reduced.

The invention discloses a dynamic simulation method for the ultrasonic welding process of multiple layers of thin plates. According to the method, simulation model combinations of different dimensions are provided, so that the problem of simulation of the mechanical property non-uniformity of the welded joint is effectively solved. The entity unit detailed model can finely present the microstructure characteristics of the welding joint, including the interface reaction area and the welding seam fusion state of each layer of plate, and the shell unit simplified model greatly improves the calculation efficiency on the premise of ensuring the engineering precision; the part impact test simulation model further combines the material failure behavior with the actual working condition. The three models support one another through a unified material failure setting system, the performance difference between a welding seam area and base metal is captured, the dynamic response rule under the impact load is reflected, and the simulation result can truly reproduce the mechanical behavior of a welding joint in the complex stress state.