29results about How to "Avoid coarsening" patented technology

The invention belongs to the technical field of steel continuous casting, and particularly relates to a 300-series stainless steel thin strip and a continuous casting preparation method thereof. The stainless steel thin strip comprises the following components in percentage by mass: 0.01-0.05% of C; 0.30% to 0.60% of Si; 16.0% to 18.5% of Cr; 0.8 to 1.6 percent of Mn; 6.0 to 12.0 percent of Ni; 0.01 to 0.05 percent of N; 0.2%-3.5% of Cu; the steel comprises the following components in percentage by weight: less than or equal to 0.005% of S, less than or equal to 0.020% of P, less than or equal to 50ppm of B, less than or equal to 100ppm of Ce and the balance of The preparation method comprises the following steps: smelting, casting, hot rolling, water cooling, coiling to obtain a hot-rolled thin strip, and carrying out heat preservation and water quenching on the hot-rolled thin strip to obtain a finished product 300 series stainless steel thin strip. By adopting the optimized crystallization roller, the high-quality thin strip with the tensile strength of 900-1110 MPa, the yield strength of 670-780 MPa, the percentage elongation after fracture of 45%-65%, no cracks and wrinkles on the surface and the thickness of about 0.6 mm is obtained. The composition is reasonable in design, the preparation process is simple and controllable, and the obtained product is excellent in performance and convenient for industrial application.

The invention discloses a rare earth aluminum alloy cable material and a preparation method and application thereof, and relates to the technical field of aluminum alloy material preparation. The rare earth aluminum alloy cable material is prepared from the following raw material components in percentage by mass: 0.3 to 0.6 percent of Ce, 0.3 to 0.6 percent of Sc, 0.05 to 0.15 percent of Y, 0.10 to 0.20 percent of Fe, 0.05 to 0.15 percent of Si and the balance of Al. The preparation process comprises the steps of melting, refining, casting, homogenizing treatment, hot rolling, drawing and aging treatment. The rare earth elements Ce, Sc and Y are added, a specific heat treatment process and a processing process are combined, and the three rare earth elements Ce, Sc and Y have a synergistic effect, so that the performance and the electric conductivity of the cable material are balanced, and the cable material has good electric conductivity and elongation on the premise of ensuring certain tensile strength, and can meet the requirements of the cable industry.

This invention discloses a free-machining high-strength aluminum-lithium alloy, its preparation method, and its applications, belonging to the field of alloy materials technology. The free-machining high-strength aluminum-lithium alloy has the following weight percentages of elements: Li: 3.5–5.5%, Cu: 2.6–3.1%, Zn: 6.8–7.1%, Mg: 2.1–3.0%, Y: 1.5–4.0%, Bi: 0.85–1.05%, In: 0.05–0.08%, Cr: 0.05–0.45%, Ti: 0.02–0.04%, with the balance being Al. This invention involves batching, smelting, refining, online refining, online degassing and filtration, casting, homogenization, extrusion, and two-stage aging treatment to finally obtain a free-machining high-strength aluminum-lithium alloy with a uniform microstructure. This invention has a reasonable component ratio, low manufacturing cost, and the resulting product has excellent strength and hardness, and exhibits excellent surface finish after dry machining.

This invention belongs to the field of high-content ceramic / metal composite material preparation technology, specifically relating to a high-fatigue-strength B4C / Al composite material and its preparation method. This invention employs chemical vapor deposition to generate CNTs in situ on the surface of micro / nano-scale B4C particles. These CNTs are then thoroughly mixed with aluminum alloy powder, and a billet is prepared using SPS plasma discharge sintering equipment. After grinding and polishing, the billet is processed using a high-frequency current rolling test bench to obtain a high-fatigue-strength B4C / Al composite material. This invention aims to improve the interfacial bonding quality of ceramic / metal composite materials and inhibit harmful reaction products through the modification effect of CNTs; the addition of high-frequency current-assisted rolling enhances the fatigue resistance of the composite material, resulting in a B4C / Al composite material with excellent comprehensive performance.

The invention discloses an ultra-high hardness surface-strengthened GGr15 steel and a preparation method thereof, and belongs to the technical field of heat treatment of metal materials. The invention discloses an ultra-high hardness surface-strengthened GGr15 steel preparation method, which adopts a multi-stage composite carbonitriding process to quickly and efficiently form dispersed granular carbonitriding compounds on the surface of GGr15 bearing steel, which can not only realize high-efficiency carbonitriding on the surface of bearing steel, but also avoid abnormal growth and coarsening of carbonitriding compounds, and significantly improve the surface hardness and wear resistance of steel; the method significantly improves the carbonitriding speed and shortens the processing cycle, thereby realizing the practicality, economy and effectiveness of the carbonitriding treatment process, and the reagent cost used in the method is low, and the processing temperature and processing time are significantly reduced, showing great potential in energy saving, emission reduction and cost reduction.

Provided is a friction stir welding method for an electromagnetic steel strip, with which it is possible to suppress the occurrence of a fracture in a coiled material joint section on a production line due to deterioration in mechanical characteristics and deterioration in shape of the coiled material joint section, with high construction efficiency. The post-cooled double-sided friction stir welding is performed on the basis of conditions such that the steel structures of the bonded portion and the hot-working-affected portion formed by the welding each become a ferrite-phase-oriented structure and the relationships of formulae (1) to (4) are satisfied at the same time.

The invention discloses a pressurized heat treatment method for rapidly enabling an aluminum alloy to obtain an isometric crystal structure. The method comprises the following steps that a heat treatment furnace is heated to the heat treatment temperature; the rolled aluminum alloy plate is placed in a heat treatment furnace, heat preservation is conducted at the heat treatment temperature, and in the heat preservation process, a pressurizing device is used for continuously applying pressure perpendicular to the rolling direction to the aluminum alloy plate; and the aluminum alloy plate is taken out and air-cooled to the room temperature. By means of the method, an equiaxed crystal structure can be rapidly obtained at the low temperature and within the short heat preservation time, anisotropy of the alloy structure is eliminated, and growth of the alloy grain size and the size of compounds in the alloy can be effectively slowed down.

This invention discloses a high specific surface area mesoporous tin oxide powder and its preparation method. The method includes: dissolving a tin source in a mixed solvent of alcohol and deionized water, adding a ketone complexing agent and a nonionic dispersant, and stirring to form a tin-based complex precursor solution; then transferring the solution to a hydrothermal reactor for hydrothermal aging treatment, causing the precursor solution to hydrolyze and condense, forming gel particles in situ; after solid-liquid separation, washing with alternating anhydrous ethanol and dilute ammonia water, and drying to obtain the precursor powder; finally, performing staged heating calcination under an air-nitrogen mixed atmosphere, first removing organic components at low temperature, and then completing the crystal phase transformation at high temperature to obtain rutile phase SnO2 powder. The powder has an average particle size of 8–15 nm and a specific surface area of ​​85–110 m² / g. 2 The powder has a pergola size of 3–6 nm and good dispersibility. This invention effectively suppresses grain agglomeration through complexation regulation, hydrothermal-sol-gel coupling, and gradient atmosphere calcination. The prepared powder is suitable for applications such as gas sensors, lithium-ion battery anodes, or transparent conductive films.

The invention discloses a high-strength and high-toughness cast aluminum alloy as well as a preparation method and application thereof, and the cast aluminum alloy comprises the following components in percentage by mass: 4%-11% of Si, 0.2%-0.8% of Mg, 0.3%-1.8% of Cu, 0.10%-0.14% of Ti, 0-1.0% of Zn, 0.10%-0.30% of Fe, 0.015%-0.030% of Sr and the balance of Al and inevitable impurities. Zn + Cu is less than or equal to 2%, and Cu / Mg is greater than or equal to 2; the preparation method comprises the following steps: carrying out heat treatment on an aluminum alloy ingot; the heat treatment comprises three stages of solid solutions, and the temperatures of the three stages are respectively 490-500 DEG C, 530-540 DEG C and 545-555 DEG C. The aluminum alloy is high in tensile strength and yield strength and high in ductility, the solid solution time is remarkably shortened during preparation, and the production cost is remarkably reduced.

The invention belongs to the technical field of high-temperature alloy preparation, and relates to an oversized fine grain N06625 alloy plate and a rolling method and application thereof. The rolling method comprises the following steps: step 1, selecting a rolling blank with a specific specification; 2, the rolled blank is pretreated, and it is guaranteed that the surface of the rolled blank is free of cracks; 3, heating the rolled blank by using a heating furnace, and preserving heat; and 4, after heat preservation is finished, the alloy plate is discharged out of the furnace and subjected to large-deformation rolling, and the target N06625 alloy plate is obtained. The technical problems that a uniform structure and a fine grain structure are difficult to form in a traditional thermal forming process, and the risk of crystal mixing exists are solved; in addition, due to the fact that N06625 is difficult to form and a hot working window is narrow, N06625 can be formed into an oversized specification at a time through the method, the structure is uniform, and the grain size is larger than or equal to grade 8.

The invention provides a low-resistance temperature coefficient precision resistance alloy and a preparation method thereof. The alloy comprises the following components: less than or equal to 0.04% of C, 1.30%-1.50% of Si, 0.30%-0.55% of Mn, less than or equal to 0.010% of S, less than or equal to 0.010% of P, 19.70%-20.50% of Cr, 3.40%-3.70% of Al, 0.60%-1.0% of Fe and the balance of Ni and inevitable impurities. The alloy has a low resistance temperature coefficient and is widely applied to the fields of aviation, aerospace and high-end instruments and meters. The manufacturing method comprises the steps that smelting is conducted in a vacuum induction furnace, a steel ingot is obtained through casting and vacuum consumable remelting, and then heating, forging and heat treatment are conducted on the steel ingot. In the smelting process, the alloy components are ensured to be accurate by controlling the pressure in the furnace, the oxygen and nitrogen content and the smelting time. And during forging, the temperature is slowly increased to 1050-1060 DEG C, heat preservation is conducted for 2-3 hours, and finally forging is conducted to the needed form. And finally, carrying out heat treatment to improve the mechanical property and the resistance temperature coefficient stability of the material. The manufacturing method can effectively improve the alloy performance, is suitable for production of precision resistor elements, and has a wide market prospect.

The invention relates to the technical field of smelting, in particular to high-impact-toughness low-temperature B-grade steel which comprises the following components in percentage by mass: 0.17%-0.23% of C, 0.3%-0.4% of Si, 1%-1.2% of Mn, less than or equal to 0.03% of S, less than or equal to 0.03% of p, 0.3%-0.4% of Cr, 0.25%-0.3% of Ni, less than or equal to 0.04% of Cu, 0.01%-0.04% of Ti and the balance of Fe and inseparable impurities. The invention further relates to a preparation process of the high-impact-toughness low-temperature B-grade steel. The prepared low-temperature B-grade steel can keep high impact toughness at the low temperature (minus 50 DEG C), wherein the impact toughness is almost unchanged compared with the impact toughness at the normal temperature.

The application discloses a kind of reinforced toughened panel concrete and preparation method thereof, belong to panel concrete preparation technical field.The reinforced toughened panel concrete of the application includes the following components: low-heat portland cement, fly ash, slag powder, silica fume, fly ash microbeads, sand, water, copper-plated steel fiber, polyethylene fiber, high-performance water reducing agent, hydration temperature rise inhibitor and calcium-magnesium composite expansive agent.The reinforced toughened panel concrete of the application can realize the whole process performance optimization of panel concrete from micro defect inhibition to macro toughening and crack control, significantly improve the compressive strength and axial tensile strength and crack resistance of panel concrete, effectively solve the intrinsic brittleness and early shrinkage cracking risk of ultra-high strength concrete.

The invention discloses a forming method for improving the grain size of a Ni2 steel forged piece, and provides a forming method for effectively improving the grain size of Ni2 steel aiming at the problems that the internal quality of the forged piece is poor, the grain size is low, the grain size grade difference is large and the like in the forging process of the Ni2 steel. The forming method adopted for solving the technical problems comprises the following steps: step 1) homogenizing heat treatment before forging; step 2), staggering an ingot protection plate; the Ni2 steel forged piece forming method comprises the steps of (1) forging, (2) forging, (3) upsetting, (4) drawing and rounding, (5) forging an intermediate blank, (6) completely annealing the intermediate blank, (7) heating the intermediate blank, (8) forging a finished product and (9) completely annealing the finished product. The Ni2 steel forged piece forming method can fully cut off Ni2 steel structure inheritance, improve the internal quality and grain size uniformity of the forged piece and reduce the grain size grade difference.

This invention discloses a high-strength, high-ductility, low-density steel and its preparation method. The composition is: C: 0.85–1.15%, Mn: 9.5–12%, Al: 8.5–11.5%, Ni: 2.5–3.5%, Cr: 2–3%, V: 0.3–0.5%, S≤0.005%, P≤0.008%, iron, and unavoidable impurities. The preparation method includes smelting, casting, forging, hot rolling, cold rolling, and recrystallization annealing processes. Through a high-C, medium-Mn, and high-Al synergistic design, Cr suppresses grain boundary carbide segregation, Ni promotes the formation of the B2 ordered phase, and V microalloying promotes the precipitation of the VC precipitate, forming a multi-scale layered structure composed of banded δ-ferrite, equiaxed (Fe,Ni)Al-type B2 phase, austenite, and nano-VC precipitates. The recrystallization annealing process achieves multi-scale layered structure control and synergistic strengthening of equiaxed (Fe,Ni)Al-type B2 phase and VC nanoprecipitates through rapid heating-short holding-rapid cooling. This invention breaks through the bottleneck of balancing strength, plasticity, and density in low-density steel, providing a high-performance material solution for automotive lightweighting.

The invention discloses a manufacturing method of a martensitic heat-resistant steel small-caliber thick-wall pipe, which specifically comprises the following steps of: (1) preparing round steel of martensitic heat-resistant steel G115, peeling, cutting off, grinding and inspecting a pipe blank, performing hot piercing, and tempering, pickling, cutting the pipe, grinding, inspecting and cleaning a pierced billet after piercing; (2) carrying out cold rolling of a deformation process on the pierced billet obtained in the step (1), and then carrying out heat treatment to obtain a finished product specification; and (3) performing visual inspection, size inspection, cleaning, mark spraying and finishing procedures on the finished pipe obtained in the step (2), and finally packaging and warehousing. The technological process provided by the invention is standardized, simple to operate and suitable for batch production, meanwhile, good balance is achieved between product performance indexes and cost control, and technical support is provided for application of the G115 steel in the small-caliber thick-wall pipe.

This invention belongs to the field of alloy forming technology and discloses a 2GPa-grade hydrogen embrittlement-resistant hot-formed steel containing NbVTiMo composite precipitates, its preparation method, and its applications. Through the synergistic proportioning of Nb, V, Ti, and Mo quaternary microalloys, a NbVTiMo composite nano-precipitate with high thermal stability and good interfacial bonding is formed. Compared with traditional single / low-element microalloy precipitates, this composite precipitate can act as a highly efficient hydrogen trap, significantly improving the hydrogen atom capture ability, effectively inhibiting hydrogen enrichment at grain boundaries and defects, improving the hydrogen embrittlement resistance of hot-formed steel, and reducing the risk of hydrogen-induced cracking and delayed fracture. Simultaneously, extending the coiling holding time promotes the full nucleation and dispersed distribution of the precipitates; shortening the austenitizing holding time avoids excessive dissolution and coarsening of the precipitates, maintaining the nanoscale of the precipitates, and achieving a fine and dense distribution of the precipitates, thus balancing hydrogen embrittlement resistance with the strength and toughness of the steel.

The present invention provides a rare earth-poor two-phase composite magnetic material and a preparation method thereof, belonging to the field of magnetic materials. The structural formula of the rare earth-poor two-phase composite magnetic material is: (RE a Nd 1‑a ) b (Fe 1‑c Co c ) 100‑b‑e‑f‑g‑h (B 1‑d Q d ) e Cu f T g M h ; Among them, RE is a light rare earth element, Q is a main group element, T is a low melting point element, and M is a grain refining element; a , c , d Respectively represent the molar fractions of RE, Co, and Q replacing Nd, Fe, and B elements, satisfying 0≤ a ≤0.2,0≤ c ≤0.05,0≤ d ≤1; b、e、f、g、h Respectively represent the molar fractions of the total content of Nd and light rare earth elements, the total content of B and main group elements, Cu elements, low melting point elements, and grain refining elements, satisfying 4≤ b ≤7, 6≤ e ≤10,0≤ f ≤1,0≤ g ≤1,0≤ h ≤2.

The utility model discloses a hollow ball screw quenching device belongs to ball screw processing technical field, including the feeding platform, the one side fixed mounting of feeding platform has the cooling platform, the one side fixed mounting of cooling platform has the sectional quenching box, the inside of feeding platform is provided with the sliding slot, the inside fixed mounting of sliding slot has the sliding board, in the utility model, through setting telescopic cover and fixed clamp, through the moving program of control box setting, will the feeding tray move to first heating chamber, after heating, through controlling the feeding tray to move to second heating chamber and heat finally, after heating, through controlling the feeding tray to move to the one side of sectional quenching box, control fixed clamp to the hollow ball screw after heating and take the inside of cooling groove and move, through a plurality of cooling spray pipe and carry out hollow ball screw cooling, and quenching process makes hollow ball screw in lightweight, high accuracy, long life etc. Contradictory demand obtains the best balance.

This application relates to a wire rod, an arc-sprayed wire, and a preparation method thereof, belonging to the technical field of arc-sprayed materials. The chemical composition of the wire rod, by mass fraction, is: C: 0.08%~0.14%, Si: 0.10%~0.60%, Mn: 1.50%~2.00%, P≤0.020%, S≤0.020%, Cr≤0.10%, Ni≤0.10%, Mo≤0.05%, Cu≤0.10%, Ti≤0.010%, Al≤0.020%, N≤0.010%, TO≤0.010%, with the remainder being Fe and unavoidable impurities. The wire is prepared by optimizing the chemical composition of the alloy wire rod through processes such as smelting, continuous casting, rolling, surface treatment, rough drawing, copper plating, and fine drawing. The mass fraction of Cu is 0.10%~0.25%, and the other elements are the same as those in the wire rod. This wire material has excellent wear and corrosion resistance and adhesion strength to the aluminum alloy substrate. It can form a stable protective coating on the inner wall of the engine cylinder, taking into account both the advantages of engine lightweighting and high performance requirements, and effectively supporting long-term service.

Provided is a friction stir welding method for an electromagnetic steel strip, with which it is possible to suppress the occurrence of breakage in a coiled material joint section on a production line due to deterioration in mechanical characteristics and deterioration in shape of the coiled material joint section, with high construction efficiency. Post-cooled double-sided friction stir welding is performed on the basis of conditions that satisfy the relationships of formula (1) and formula (2) at the same time.

The invention relates to a nanometer phase change particle dispersion strengthening tungsten alloy and a preparation method thereof.The tungsten alloy is composed of a W matrix and HfO2 (at) WO3 nanoparticles with a core-shell structure, the content of the HfO2 (at) WO3 nanoparticles with the core-shell structure ranges from 0.2% to 2.0% by weight, and the content of the W matrix ranges from 98.0% to 99.8% by weight. The tungsten alloy is obtained by introducing nano HfH2 particles onto a W matrix in a heating, pressurizing and oxygen-free environment and carrying out thermal mechanical deformation processing to generate HfO2 (at) WO3 particles with a core-shell structure in situ on the W matrix by utilizing phase change in the heating and cooling processes. The tungsten alloy has excellent low-temperature toughness, and the high-temperature strength of the tungsten alloy is far higher than that of a currently reported tungsten-based material. At 800 DEG C, the tungsten alloy still has excellent tensile strength.

The invention discloses non-oxidation drawing forming equipment for high-purity aluminum wires, which comprises a support frame, a sealing box fixedly connected to the top end of the support frame, a box door hinged to the side end of the sealing box, a driving part arranged on the sealing box and used for driving the aluminum wires to move along the radial direction of the aluminum wires, and a forming part arranged on the sealing box and used for drawing and forming the aluminum wires, the sealing box is provided with an annealing piece used for conducting annealing treatment on the aluminum wire after the aluminum wire is drawn and formed. Rapid heating, high heating efficiency and low energy consumption of the aluminum wire are achieved through the annealing piece by adopting the electromagnetic induction principle, the low-temperature high-purity argon annular spraying quenching of the spray gun can rapidly lock the microstructure of the aluminum wire, grain coarsening is prevented, the partition plate separates the induction heating area and the quenching area, mutual interference of heat is avoided, the stable annealing effect is guaranteed, and the service life of the aluminum wire is prolonged. And meanwhile, a micro-positive pressure environment is established through the air flow difference between the exhaust groove and the spray gun, air permeation is thoroughly blocked, argon recovery and purification are combined, it is guaranteed that the aluminum wires are not oxidized in the whole process, and the argon use cost is reduced.

This invention discloses an Al-Bi-Sn immiscible alloy and its rotational deposition solid-state additive manufacturing method, belonging to the fields of metal composite materials and solid-state additive manufacturing technology. In this invention, the Al-Bi-Sn immiscible alloy is, by atomic percentage (at.%), Al 100‑x‑ y Bi x Sn y The alloy is prepared by rotational deposition solid-phase additive manufacturing method, where x = 8~15, y = 7~20, and x+y = 15~35. By controlling the component ratio and microstructure, the present invention achieves uniform composite of BiSn solid solution matrix and Al phase particles, with no particle agglomeration, high density, and excellent hardness and self-lubricating wear resistance, which can directly meet the application requirements of lightweight wear-resistant components such as automotive bearings and dry friction bearings.

The invention discloses an iron-based oxide catalyst as well as a preparation method and application thereof. The iron-based oxide catalyst comprises a main catalyst body and a cocatalyst distributed on the main catalyst body, the main catalyst body comprises iron powder, and the cocatalyst comprises iron oxide. The preparation method comprises the following steps: in the presence of water vapor and oxygen, iron powder is subjected to an oxidation reaction in a reaction chamber, iron oxide is generated on the surface of the iron powder in situ, and the iron-based oxide catalyst is prepared. The iron-based oxide catalyst provided by the invention is good in stability and controllable in particle size, and the cocatalyst component and the main catalyst body have strong interaction, so that agglomeration and falling of the cocatalyst can be effectively prevented; when the catalyst is applied to catalytic preparation of carbon nanotubes, the yield is high, and the tube diameter is uniform.

The invention discloses a continuous ceramic powder production device and method. The continuous ceramic powder production device comprises a gas-powder mixing bin, a molten raw material liquid storage tank, a conveying pipe, a Venturi mixer, a discharged material cooling bin and a discharged material collecting device, the conveying pipe penetrates through the molten raw material liquid storage tank, one end of the conveying pipe is communicated with the gas-powder mixing bin, the other end of the conveying pipe is communicated with the discharging cooling bin, and the discharging cooling bin is communicated with the discharging collecting device; a raw material gas inlet and a seed crystal powder inlet are formed in the gas-powder mixing bin; a molten raw material liquid inlet is formed in the molten raw material liquid storage tank; the venturi mixer is arranged in the conveying pipe, and a liquid suction pipe extending into the molten raw material liquid storage tank is arranged on the venturi mixer. Continuous, particle size-controllable, high-efficiency and high-quality production of the ceramic powder is realized.

A Ni-based alloy consisting of, in terms of mass%: 0.10% < C ≤ 0.30%; Si ≤ 0.50%; Mn < 0.50%; P < 0.030%; S < 0.010%; Cu ≤ 3.00%; 30.0% ≤ Cr ≤ 39.0%; Mo ≤ 3.00%; Fe < 3.00%; 2.00% < Al < 5.00%; O < 0.0100%; N < 0.050%; Nb < 0.50%; V < 0.50%; Ti ≤ 0.50%; Ta≤ 0.50%; W ≤ 0.50%; and at least one selected from the group consisting of 0.0010% ≤ B ≤ 0.0100%, 0.0010% ≤ Mg ≤ 0.0100%, and 0.0010% ≤ Ca ≤ 0.0100%, with the balance being Ni and unavoidable impurities, in which the alloy comprises an austenite phase having an average grain diameter of 50.0 µm or less, a M23C6-type carbide having an average circle equivalent particle diameter of 1.0 µm or more, and a massive α-Cr phase having an average circle equivalent particle diameter of 10.0 µm or less.

The present invention provides a negative electrode active material for a secondary battery, a method for preparing the same, and a lithium secondary battery including the same, the negative electrode active material including a silicon / carbon (Si / C) composite in which a silicon-based coating layer is formed on carbon-based particles, the peak area ratio A2 / A1 of the Si / C composite according to X-ray diffraction analysis is 0.2 to 3.0, and the peak area ratio A2 / A1 of the Si / C composite according to X-ray diffraction analysis is 0.2 to 3.0. The preparation method of the negative electrode active material for the secondary battery comprises the following steps: a pretreatment step of performing heat treatment on carbon-based particles; and a microwave calcination step of mixing the carbon-based particles and the silicon-based particles that have been subjected to the heat treatment and irradiating the mixture with microwaves.

The invention discloses a preparation method of silver-plated copper powder based on high-activity replacement, and belongs to the technical field of metal surface treatment. The copper powder is subjected to alkali washing, acid washing and water washing and then subjected to ultrasonic treatment for 15-25 min at the temperature of 60-70 DEG C with a 35-45 vol% ethanol water solution. The surface activated copper powder is dispersed in a solution containing 10-30 g / L of a complexing main agent and 8-15 g / L of a complexing auxiliary agent, EDTA disodium is preferably selected as the complexing main agent, and potassium sodium tartrate is preferably selected as the complexing auxiliary agent. A silver-ammonia solution with the Ag < + > concentration being 8-12 g / L and the ammonia water concentration being 2.5-4.0 mol / L is dropwise added into a reaction system at the temperature of 35-45 DEG C at the speed of 0.2-1.0 mL / min; and after the reaction is finished, centrifugally washing the silver-plated copper powder, and drying in vacuum. According to the method, ethanol mixed liquid is used for heating ultrasonic treatment of copper powder, and active site density is improved. A double-complexing slow-release system is used for controlling the reaction rate, a complexing main agent is used for preventing particle aggregation caused by rapid reduction, and a complexing auxiliary agent is used for cooperatively regulating and controlling the Ag < + > release rate, so that a silver layer uniformly grows. And dropwise adding a silver-ammonia solution in a low-temperature gradient manner to realize gradual reduction of Ag < + >. The silver content of the prepared silver-plated copper powder is 20-25%, and the silver layer coverage rate is larger than or equal to 96%.