118 results about "Microwave sintering" patented technology

The invention belongs to the field of synthesis of inorganic non-metallic materials, and particularly relates to an equimolar-ratio seven-element high-entropy oxide and a preparation process thereof. The preparation process comprises the following steps: putting seven oxide powder Al2O3, Y2O3, TiO2, ZrO2, NiO, CuO and CeO2 into a ball milling tank according to a molar ratio of 1: 1: 2: 2: 2: 2: 2: 2, adding absolute ethyl alcohol and zirconium oxide grinding balls, performing ball milling in a ball mill, and fully drying and sieving after ball milling to obtain mixed powder; carrying out tabletting treatment on the mixed powder to obtain a to-be-sintered green body; and putting the to-be-sintered green body into an alumina crucible, and putting the alumina crucible into a microwave oven for microwave sintering. According to the method, the equimolar-ratio seven-element high-entropy oxide (AlYTiZrNiCuCe) Ox with good solid solution is obtained, the crystallinity and element uniformity of the seven-element high-entropy oxide are improved, all the raw materials react completely, meanwhile, the process efficiency is high, and energy consumption is low.

The invention discloses a polytetrafluoroethylene ceramic membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) adding polytetrafluoroethylene and a binder into water, and carrying out first mixing to obtain polytetrafluoroethylene slurry; adding a carbon nanotube and a dispersing agent into water, and carrying out secondary mixing, so as to obtain a carbon nanotube dispersion liquid; (2) carrying out third mixing on the carbon nanotube dispersion liquid and the polytetrafluoroethylene slurry to obtain a membrane preparation liquid; and (3) coating the surface of a ceramic support with the membrane preparation liquid, drying, and carrying out microwave sintering. The PTFE / ceramic composite membrane is prepared by microwave sintering, so that the sintering time and the production period are obviously shortened, and the production efficiency and the energy utilization rate of the product are obviously improved; the prepared PTFE / ceramic composite membrane is narrow in pore diameter and uniform in pore diameter distribution, has good hydrophobicity and oil-water separation performance, can effectively intercept 30-200nm nanoparticles, and has excellent anti-pollution capacity and stable separation performance for water-in-oil emulsions with different concentrations.

The application belongs to the field of ceramic fibers, and particularly relates to a preparation method of fine-crystal dense alumina ceramic fibers. The application first configures an aluminum sol, an iron sol, a PVP solution and an acidified silica sol, then mixes them according to a set proportion to obtain a mixed sol, concentrates the mixed sol to obtain a spinnable gel, heats the spinnable gel to 500-600 DEG C at a heating rate of 2-10 DEG C / min for pre-sintering after spinning, finally performs microwave sintering at 1000-1400 DEG C at a power of 3000-5000 W and a heating rate of 50-100 DEG C / min to obtain the fine-crystal dense alumina ceramic fibers. The application has simple and controllable process, and the obtained product has excellent performance and is convenient for large-scale industrial application.

The invention provides core-shell structure reinforced white carbon black / graphene oxide hybridized glass-lined porcelain glaze and a preparation method thereof. The porcelain glaze is composed of a basic glaze material and a core-shell structure hybrid reinforcement phase dispersed in the basic glaze material, the reinforcement phase takes white carbon black as a core and zirconium oxide as a shell, and a three-dimensional hybrid network formed by KH-560 grafted cellulose nanocrystals or carbon nanotubes and graphene oxide is constructed between the core and the shell. The preparation method mainly comprises the following steps: carrying out pre-dispersion and in-situ hybridization on the white carbon black, the graphene oxide and the one-dimensional nanofibers through a silane coupling agent; constructing a three-dimensional network under a catalytic condition by using a sol-gel method; a stable core-shell structure is formed through a deposition reaction of zirconium sol; finally, the obtained composite slurry is compounded with basic glaze with specific components, rapid densification is achieved through microwave sintering, and the product is particularly suitable for chemical reaction kettle glass lining with strict requirements for corrosion resistance and impact resistance.

The invention belongs to the technical field of medium-entropy ceramic materials, and relates to a preparation method of a yttrium-zirconium-cerium ternary medium-entropy oxide ceramic material, which comprises the following steps: weighing Y2O3 powder, ZrO2 powder and Ce02 powder according to a molar ratio of 1: 2: 2, carrying out ball-milling mixing to obtain mixed powder, drying the mixed powder, prepressing into a blank, carrying out microwave sintering, and carrying out sintering to obtain the yttrium-zirconium-cerium ternary medium-entropy oxide ceramic material. Synthesizing a yttrium-zirconium-cerium ternary medium-entropy oxide (Y1 / 3Zr1 / 3Ce1 / 3) O2 ceramic material with an equal molar ratio; according to the invention, the raw materials are simple, the preparation steps are simple, the production efficiency is high, the microwave sintering technology is low in sintering temperature and short in sintering time, microwave is utilized to reduce activation energy of substances to accelerate sintering and generate uniform fine grains, and internal pores of the fine grains are small and round, so that the sintered material has good stability and reprocessability; according to the process, green and continuous production is easy to realize, the production scale and efficiency are further improved, and a new way and thought are provided for industrial microwave sintering preparation of the medium-entropy oxide ceramic material.

The invention relates to the technical field of electrolyte preparation, in particular to a solid electrolyte and a preparation method and application thereof, and a modified positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a lithium source, a metal halogen compound and a solvent, and uniformly stirring to obtain a mixed material; the solvent comprises water and an organic solvent, and the mass content of the water in the solvent is 5%-10%; (2) heating the mixed material, and drying to obtain a solid electrolyte precursor; and (3) microwave sintering. The solid electrolyte precursor is prepared by adopting a wet process, the batch consistency of the solid electrolyte is remarkably improved and the synthesis efficiency is improved by matching with a microwave sintering technology, the preparation of the solid electrolyte with high compactness and uniform grain size is facilitated, and the ionic conductivity is greater than 5mS / cm and is remarkably higher than that of the solid electrolyte prepared by a traditional ball milling method.

The invention discloses an aluminum oxide ceramic composite material and a preparation method thereof, and belongs to the technical field of ceramic materials. The ceramic material is prepared from the following raw materials in parts by weight: 25-40 parts of nano aluminum oxide, 30-45 parts of micron aluminum oxide, 15-20 parts of silicon carbide whiskers, 1.5-3 parts of graphene and 5-7 parts of a sintering aid. The nano aluminum oxide can fill particle gaps of the micron aluminum oxide and improve compactness and hardness, the silicon carbide whiskers are added to improve the toughness of the ceramic material, microwave sintering and hot pressing sintering are combined for application, energy consumption is greatly reduced, grains are refined, the ceramic material has wide application prospects in practice, the preparation method is simple, and the preparation method is suitable for industrial production. And large-scale industrial production can be carried out.

The invention relates to preparation and application of a microwave sintering modified coal gangue-based catalyst. The method comprises the following steps: crushing coal gangue, calcining, desulfurizing and carrying out hydrothermal reaction to obtain coal gangue powder; treating with hexadecyl trimethyl ammonium bromide to obtain modified coal gangue; dispersing the modified coal gangue, a cerium source compound and a titanium source compound in deionized water, stirring and dipping, and drying to obtain a catalyst precursor; and sintering the catalyst precursor in a microwave oven, and cooling to room temperature to obtain the coal gangue-based catalyst. The coal gangue is used as a carrier, and the composite material Ce-Ti / CG for flue gas denitration is synthesized through microwave sintering. The coal gangue provides a good space for a substance adhesion reaction, and diffusion and mass transfer are facilitated. The invention not only provides an effective catalyst for flue gas denitration, but also provides a new idea for effective utilization of solid wastes.

The invention relates to the technical field of piezoelectric material preparation and processing, in particular to high-performance lead zirconate titanate piezoelectric ceramic and an in-situ 3D printing and densification method thereof. According to a stoichiometric ratio, initial raw materials ZrO2, TiO2 and PbCO3 required for synthesizing PZT piezoelectric ceramics are mixed with photosensitive resin to obtain PZT precursor piezoelectric ceramic slurry for photocuring, and a PZT complex structural part with high precision and high piezoelectric performance is obtained by utilizing a photocuring 3D printing technology and a microwave sintering densification process. The single-layer curing thickness of the slurry is increased from 23 microns to 92 microns, and the forming precision and interlayer bonding performance of a green body are improved; the microwave sintering densification process is beneficial to maintaining the stoichiometric ratio and piezoelectric activity of the PZT piezoelectric ceramic.

The present invention relates to a method for preparing hollow spherical silicon carbide powder. A green body is prepared by mixing silica sol and plant carbon source. After partial carbonization treatment of the green body, it is placed in a microwave sintering furnace for microwave sintering at 700 - 1000 °C to obtain the hollow spherical silicon carbide powder. The present invention utilizes the forming characteristics of silica sol gel to fully mix the plant carbon source with nano-scale silica sol; the plant carbon source is prone to release a large amount of gas when heated. By using rapid microwave heating, the organic matter in the plant carbon source volatilizes rapidly, generating instantaneous microwave plasma. The plant carbon source quickly becomes a molten state, and the gas expands rapidly, forming a cavity, and then a ceramic microsphere with a hollow spherical structure is prepared. The present invention can be directly used for preparing porous silicon carbide ceramics, porous silicon carbide coatings, catalyst carriers, high-performance microwave absorbing materials, heat insulation materials, etc., and has extremely high application prospects and development space.

The invention discloses a preparation method and application of a plasma-assisted gradient doped sulfide solid electrolyte, and belongs to the technical field of preparation of solid-state battery materials. According to the method, four-order synergistic processes of plasma activation, gradient doping, microwave sintering and supercritical purification are combined, atomic-scale mixing is achieved through plasma-assisted ball milling, a gradient Cl doping process is combined to optimize a crystal structure, energy consumption is reduced by 70% through microwave sintering, and the product purity is improved to 99.5% by adopting a supercritical carbon dioxide purification technology. The corollary equipment integrates a corrosion-resistant ball milling bin, a high-precision microwave module and an online detection system, and is suitable for large-scale production, the ionic conductivity reaches 6.4 mS / cm, the cycle performance is improved by 150%, the continuous production process only needs 3 h, and compared with the traditional process which needs more than 12 h, the efficiency is improved by 400%.

The invention discloses a double-doped single-crystal ultrahigh-nickel positive electrode material and a preparation method and application thereof, and the positive electrode material is mainly prepared by the following method: (1) carrying out ball milling on nano nickel oxide or nano cobaltosic oxide, nano manganese dioxide, a boron source and an aluminum source, and uniformly mixing to obtain mixed powder; and (2) uniformly mixing the mixed powder obtained in the step (1) with a lithium source, carrying out two-stage microwave sintering in an oxidizing atmosphere, cooling to room temperature along with a furnace, and grinding to obtain the double-doped single-crystal ultrahigh-nickel positive electrode material. A positive pole piece prepared from the double-doped single-crystal ultrahigh-nickel positive pole material is applied to the field of lithium ion batteries. The positive electrode material is compact in grain, stable in structure, high in crystallinity and low in Li / Ni mixed arrangement, and a battery assembled by a prepared electrode plate is excellent in high rate performance and cycle performance. The method disclosed by the invention is simple in process, rapid, green, environment-friendly, energy-saving, consumption-reducing, low in cost and suitable for industrial production.

The invention provides a method for reducing silicon inclusion defects in silicon carbide single crystals, which comprises the following steps of: A) carrying out microwave sintering on silicon carbide powder under a vacuum condition and a protective atmosphere before the silicon carbide powder grows silicon carbide crystals; the microwave sintering comprises a first stage, a second stage and a third stage; in the first stage, the silicon carbide powder is heated to the temperature T1 from the room temperature with the microwave power P1, and heat preservation is conducted for t1 time at the temperature T1; in the second stage, the silicon carbide powder is heated from the temperature T1 to the temperature T2 at the microwave power P2; in the third stage, the temperature T2 is kept constant at the microwave power P3, and heat preservation is conducted for t2; p2 > P1, and P3 < = P2; t1 ranges from 300 DEG C to 600 DEG C, and T2 ranges from 1400 DEG C to 1800 DEG C; and B) washing and drying the silicon carbide powder subjected to microwave sintering. The method provided by the invention effectively improves the defect of silicon wrappage directly generated due to rich Si in a gas phase in the growth process.

The present application relates to a kind of high efficient preparation high-strength high-conductivity copper-based composite wire method, through high-purity citric acid or citrate one-step generation zero-dimensional GQDs load in two-dimensional GN surface multi-dimensional reinforcing phase, using stirring ball mill preparation kilogram-level GQDs@GN / Cu composite powder, then through pre-pressing and microwave sintering equipment preparation composite bar, finally using cold extrusion extrusion into wire material of cylindrical bar, the yield strength and tensile strength of the GQDs@GN / Cu composite wire material prepared by the method are 274MPa and 314MPa respectively, and the conductivity is as high as 95.3%IACS;The present application has short preparation time, simple process, low production cost, high yield, good reinforcing effect, and is suitable for mass production.

The utility model relates to the technical field of ceramic sintering, and discloses a low-temperature fast-firing conductive ceramic microwave-assisted sintering device which comprises a microwave sintering furnace and a furnace chamber arranged on the microwave sintering furnace, the furnace chamber comprises a sintering chamber, a placing frame is connected in the furnace chamber in a sliding mode, and the placing frame comprises placing plates and sealing plates which are fixed alternately. The sealing plate is used for shielding the furnace chamber; the placing frame is arranged in the furnace chamber of the microwave sintering furnace, the placing frame is formed by alternately fixing the placing plates and the sealing plates, a plurality of conductive ceramics can be placed on the placing plates, the placing frame is moved to enable the conductive ceramics to sequentially enter the sintering chamber of the furnace chamber to be sintered, and the conductive ceramics are directly moved out after being sintered. The efficient sintering of the conductive ceramic is realized by adopting a reciprocating translation mode, the conductive ceramic is convenient to take, and the sintered conductive ceramic is still sintered when the sintered conductive ceramic is taken, so that the sintering efficiency is improved, and the phenomena of heat dissipation and energy waste caused by repeatedly opening the furnace chamber are avoided.

The invention discloses an NTC (Negative Temperature Coefficient) thermistor resistant to a low temperature of-100 DEG C and a preparation method thereof, and relates to the technical field of thermistors. The preparation method comprises the following steps: firstly, adding metal oxide mixed powder into a dispersing agent, and pressing into an NTC thermistor matrix by an isostatic pressing process; reacting silicon carbide, silver nitrate and sodium chloride to obtain silver-loaded silicon carbide, and reacting the silver-loaded silicon carbide and a silane coupling agent to obtain modified silicon carbide; the preparation method comprises the following steps: reacting polytetrafluoroethylene with acrylic acid under irradiation to obtain modified polytetrafluoroethylene; carrying out condensation reaction on the modified silicon carbide and the modified polytetrafluoroethylene to prepare conductive aerogel; and wrapping the outer layer of the NTC thermistor substrate with conductive aerogel, and then preparing the NTC thermistor by adopting a microwave sintering process. The low-temperature-resistant conductive aerogel is used for replacing conductive silver paste, and good performance stability can still be kept at the low temperature.

The invention discloses a method for preparing a light roadbed material from municipal sludge and fly ash, and belongs to the technical field of solid waste resource utilization. The method comprises the following steps: conditioning municipal sludge by using a dehydrating agent, and carrying out mechanical dehydration treatment to obtain absolutely dry sludge; the preparation method comprises the following steps: mixing 40 parts by weight of absolute dry sludge, 60 parts by weight of fly ash and 2-5wt.% of CaO fluxing agent, carrying out high-energy ball milling and sieving, mixing with a methylcellulose solution, and carrying out compression molding; and drying at 120-150 DEG C, heating to 1050 DEG C at the speed of 50-100 DEG C / min, carrying out microwave sintering, and cooling to obtain the light high-strength roadbed material. Through detection, the compressive strength of the prepared material reaches 19.98 MPa, the density is 1.54 g / cm < 3 >, the strength retention rate is 88% after 50 times of freezing and thawing cycles, and the leaching concentration of Cd and Pb is far lower than the limit value of GB5085.3-2007. According to the method, collaborative harmless and high-value utilization of the sludge and the fly ash is realized, and the obtained material is suitable for road subgrade filling.

The invention discloses a preparation method of a lithium battery positive electrode material, and relates to the technical field of lithium battery processing. The preparation method comprises the following steps: step 1, preparing a precursor: dissolving nickel cobalt manganese metal salt in a water-ethanol mixed solvent to form a metal salt solution, dispersing a mesoporous SiO2 template in absolute ethyl alcohol to form a template suspension, mixing the metal salt solution with the template suspension, and carrying out a co-precipitation reaction under the assistance of ultrasonic waves; through cooperation of a water-ethanol double-solvent system and ultrasonic waves, the hydrolysis rate of metal ions is regulated and controlled, uniform mixing of molecular scales is achieved, the element distribution standard deviation is smaller than or equal to 1.2%, interface side reactions are reduced, the first coulombic efficiency is improved to 88%-89.5%, a mesoporous SiO2 template is combined with microwave sintering, the particle size is controlled to be 50-100 nm, and the mesoporous SiO2-based composite material is prepared. A surface layer porous structure (porosity is greater than or equal to 50%) is formed through vapor etching, the specific surface area reaches 60-80m < 2 > / g, the lithium ion diffusion coefficient is improved by more than 5 times, and the 5C rate capacity is improved by 40-50% compared with that of a traditional process.

The invention discloses a preparation method of an asymmetric ferric oxide ceramic composite membrane, which comprises the following steps: step 1, carrying out high-temperature hydrolysis reaction on a ferric chloride aqueous solution to obtain ferric hydroxide sol, cooling, and adding a polyvinyl alcohol aqueous solution into the ferric hydroxide sol to obtain a ferric hydroxide sol membrane preparation solution; and 2, dipping a ceramic microfiltration membrane in the iron oxide sol membrane preparation solution obtained in the step 1, taking out, drying at room temperature, and carrying out microwave sintering. According to the invention, a new iron oxide film layer is formed on the surface of the ceramic microfiltration membrane by regulating and controlling the iron oxide sol membrane preparation liquid and the microwave sintering power and time. The steps and time required by sintering are greatly reduced, the energy required by sintering is saved, the membrane preparation cost is reduced, and the obtained asymmetric iron oxide ceramic composite membrane has the advantages of high membrane flux and strong pollution resistance.

The application discloses a kind of 100 ℃ low temperature resistant NTC thermistor and preparation method thereof, it is related to thermistor technical field.The application first metal oxide mixed powder is added into dispersing agent and is pressed into NTC thermistor matrix by isostatic pressing process;Silicon carbide, silver nitrate, sodium chloride are reacted to obtain silver-loaded silicon carbide, the silver-loaded silicon carbide is reacted with silane coupling agent to obtain modified silicon carbide;Polytetrafluoroethylene and acrylic acid are reacted under irradiation to obtain modified polytetrafluoroethylene;Modified silicon carbide and modified polytetrafluoroethylene are condensed to obtain conductive aerogel;After NTC thermistor matrix outer layer is wrapped with conductive aerogel, NTC thermistor is prepared by microwave sintering process.The application uses a kind of low temperature resistant conductive aerogel to replace conductive silver paste, which can still maintain good performance stability at low temperature.

The application discloses an anti-thermal shock alumina fiber reinforced phosphate high-temperature-resistant composite material and a preparation method thereof, and belongs to the technical field of ceramic matrix composites. The material is composed of gradient modified alumina fiber reinforcement, composite phosphate matrix and multi-scale composite filler. The fiber surface is provided with a nano yttrium oxide-yttrium phosphate gradient interface layer, and the matrix is an aluminum phosphate-zirconium phosphate-yttrium oxide composite system. The preparation method comprises fiber degumming, gradient interface modification, slurry preparation, impregnation and curing and microwave sintering. Through gradient interface regulation and composite matrix design, the application solves the problems of poor thermal shock resistance and insufficient high-temperature stability of the existing materials. Tests show that the material has no macroscopic cracking after 10 times of water cooling at 1300 DEG C, the strength retention rate is greater than or equal to 88%, the room temperature bending strength is greater than or equal to 280 MPa, and the material has excellent high-temperature mechanical properties and thermal shock stability, and is suitable for aerospace thermal protection and high-temperature structural parts.

The invention discloses a kind of spheroidizing inoculation method of high spheroidizing rate ductile iron, belong to ductile iron technical field, described method includes: prepare composite inoculant, prepare spheroidizing agent, fix, spheroidizing inoculation, heat treatment;Described preparation composite inoculant, by silicon powder and carbon black after mixing, carry out microwave sintering, microwave sintering 30 35min after, grind, remove carbon;Described preparation spheroidizing agent, rare earth magnesium silicon type spheroidizing agent is crushed, obtain millimeter grade spheroidizing agent;Then take out one-third from millimeter grade spheroidizing agent, continue to crush, ball milling, then after mixing with remaining millimeter grade spheroidizing agent, obtain mixed rare earth magnesium silicon type spheroidizing agent;Mixed rare earth magnesium silicon type spheroidizing agent is mixed with iron powder, obtain compound, use tinplate to wrap compound.The method of the present invention can improve the spheroidizing rate, plasticity and toughness of ductile iron, and improves the utilization rate of the spheroidizing agent used in ball-milled cast iron production.

The invention belongs to the technical field of high-entropy ceramics, and particularly relates to a boride high-entropy ceramic and a preparation method thereof. The preparation method comprises the following steps: adding a simple substance raw material, a dispersing agent and grinding balls into a ball-milling tank, performing mechanical ball-milling and mixing to obtain a turbid liquid, and then drying, grinding and sieving to obtain powder to be sintered; and pre-pressing the to-be-sintered powder into blocks, putting the blocks into a silicon carbide crucible, then putting the silicon carbide crucible into a microwave sintering furnace, carrying out microwave sintering on the blocks under the protection of an inert atmosphere, cooling and grinding to obtain the high-entropy boride ceramic. The microwave sintering technology is adopted for preparing the six-element high-entropy boride ceramic (VCrMoWTiNi) B for the first time, the element segregation problem caused by the thermal gradient in the sample sintering process is avoided, the sintering temperature is reduced, the uniformity of the sample is effectively improved, preparation of the high-performance six-element high-entropy boride is promoted, the preparation period is shortened, and energy is saved.

The invention belongs to the technical field of preparation of silicon nitride powder, and relates to a method for preparing silicon nitride powder with high alpha-phase content by microwave heating, which comprises the following steps: firstly, grinding raw material silicon powder to proper granularity by using a planetary ball mill, then uniformly mixing the silicon powder with a certain mass of urea, and finally putting the mixed powder into a microwave sintering furnace, heating to a reaction temperature in a microwave heating manner, and keeping the temperature for a certain time, so as to obtain the silicon nitride powder with high alpha-phase content. The silicon nitride powder with high alpha-phase content is rapidly synthesized at low temperature by combining the characteristics of a microwave heating material and the nitridation reaction property of the silicon powder and researching the influence of a microwave applying mode, heating power, reaction time, additives on the reaction process and the like, and the method is low in reaction temperature, short in preparation period, high in energy utilization rate and suitable for large-scale industrial production.

The invention discloses a manufacturing process of a high-magnetic-energy-product low-oxygen neodymium-iron-boron magnet. The process comprises the steps of burdening, vacuum melting, hydrogen decrepitation, jet milling, magnetic field forming, isostatic pressing, microwave sintering and tempering and surface treatment. A fluoride-rare earth composite additive composed of lithium fluoride and neodymium fluoride is added in the burdening stage, and in the microwave sintering stage, microwaves serve as a heating source, the sintering temperature and the heat preservation time are controlled, and the microstructure of the magnet is optimized in cooperation with a tempering process. The sintering activation energy can be reduced through lithium fluoride in the composite additive, a foundation is laid for low-temperature sintering, neodymium fluoride can be preferentially combined with oxygen impurities in the magnetic powder to generate low-melting-point oxyfluoride, and formation of a non-magnetic oxidation phase is avoided; the temperature gradient problem of resistance furnace sintering is solved through microwave heating, the temperature in the blank is increased synchronously, and the deoxidation and densification effects of the composite additive are fully achieved. The finally prepared neodymium-iron-boron magnet has the low-oxygen characteristic, high density and excellent magnetic performance, and the coercive force attenuation rate in a high-temperature environment is low.

The invention provides a microwave sintering aid and application thereof. The microwave sintering aid provided by the invention comprises the wave-absorbing agent, so that the wave-absorbing capacity of the material to be subjected to microwave sintering can be enhanced, the material to be subjected to microwave sintering is helped to absorb microwaves and be rapidly heated to the sintering temperature, and the time required by sintering is shortened. The microwave sintering aid provided by the invention comprises the fluxing agent, the fluxing agent can reduce the melting point, promote the generation of molten substances, enhance the strength of sintered ceramsite, reduce the density of the sintered ceramsite and reduce the water absorption rate, and meanwhile, heavy metals in a material to be subjected to microwave sintering can form a water-insoluble compound; therefore, the leaching risk of heavy metals is reduced. The microwave sintering aid provided by the invention comprises the reaction aid, and the reaction aid is a reducing agent or an oxidizing agent, so that heavy metals in a material to be subjected to microwave sintering can be reduced or oxidized from a high-toxicity valence state to a non-toxic valence state, and the toxicity of the heavy metals in the sintered ceramsite is reduced.

The invention discloses a method for preparing a titanium alloy product based on a binder spraying additive manufacturing process, which comprises the following steps: (1) preparing titanium alloy powder with the oxygen content of less than or equal to 100ppm, carrying out vibration screening on the obtained titanium alloy powder, and selecting particles with the particle size range of 5-25 microns; (2) the surfaces of titanium alloy powder particles are coated with nano oxide coatings, the titanium alloy powder coated with the nano oxide coatings is subjected to vacuum drying and then transferred into binder spraying additive manufacturing equipment, a green body is printed by controlling the binder spraying technology, and the strength of the green body is made to be larger than or equal to 5 MPa; and (3) the green body is subjected to degreasing, microwave sintering and hot isostatic pressing treatment, and the oxide dispersion enhanced titanium alloy product is obtained. According to the method, the oxygen content in the titanium alloy powder is reduced, meanwhile, the surface of the titanium alloy powder is coated with the nanometer oxide coating, and microwave sintering and hot isostatic pressing treatment are cooperated under specific conditions, so that micro cracks and micro holes in the titanium alloy component can be effectively eliminated, and the density of the titanium alloy component is greatly improved; therefore, the mechanical property is improved.

This invention discloses a rapid, high-strength microwave bonding method for ceramics and cemented carbide, belonging to the field of ceramic material bonding technology. The method includes the following steps: preparing a metal solder; grinding, polishing, and cleaning the bonding surfaces of the ceramic and cemented carbide respectively; loading the prepared metal solder into a mold and pressing it under uniaxial pressure to obtain a metal solder sheet; placing the ceramic, metal solder sheet, and cemented carbide in a stacked structure in a microwave sintering furnace for microwave sintering to achieve the bonding of the ceramic and cemented carbide. Compared with traditional brazing and diffusion welding, this ceramic-cemented carbide microwave bonding method increases the heating / cooling rate by 6-10 times, improves the single-furnace bonding efficiency by 5-9 times, allows for mass production, and yields ceramic-cemented carbide bonding interfaces with high strength. This invention significantly improves production efficiency, reduces energy consumption, and has widespread application value.

The invention belongs to the technical field of inorganic non-metallic materials, and discloses a method for preparing high-entropy oxide-silicon carbide composite ceramic through microwave sintering, high-entropy oxide precursor powder and silicon carbide powder are used as raw materials, wet ball milling or dry ball milling is adopted, the obtained mixed powder is molded into a blank, the blank is put into a microwave sintering furnace, and the high-entropy oxide-silicon carbide composite ceramic is prepared through microwave sintering. And carrying out microwave sintering in a vacuum or protective atmosphere, and carrying out heat preservation treatment to synthesize the high-entropy oxide-silicon carbide composite ceramic. Silicon carbide is innovatively introduced into the high-entropy oxide ceramic and can serve as a microwave absorbing heat source, low-temperature rapid heating of the composite ceramic is achieved, and densification is promoted through the activity of the high-entropy oxide; as a hard reinforcing phase, through particle strengthening and crack deflection mechanisms, the strength of the composite material is improved at the same time; the constructed heat-conducting network combines high wear resistance and excellent heat dissipation capability of the high-entropy oxide, and the prepared composite ceramic material has excellent comprehensive properties such as high hardness, high heat conductivity, good wear resistance and the like.

The application belongs to the technical field of medium-entropy ceramic materials, and relates to a preparation method of yttrium-zirconium-cerium ternary medium-entropy oxide ceramic material, Y2O3 powder, ZrO2 powder and CeO2 powder are weighed according to a proportion of 1:2:2 in terms of molar ratio, mixed by ball milling to obtain mixed powder, the mixed powder is dried and pre-pressed into a blank, microwave sintering is carried out, and yttrium-zirconium-cerium ternary medium-entropy oxide (Y 1 / 3 Zr 1 / 3 Ce 1 / 3 )O2 ceramic material with an equimolar ratio is synthesized. The application has simple raw materials, simple preparation steps and high production efficiency, the sintering temperature is low and the sintering time is short by using the microwave sintering technology, the activation energy of substances is reduced by using the microwave to accelerate sintering, uniform fine grains are generated, the internal pores of the fine grains are small and round, which makes the sintered material have good stability and reworkability, the process is easy to realize green and continuous production, further improves the production scale and efficiency, and provides a new way and thought for industrial microwave sintering preparation of medium-entropy oxide ceramic materials.