75 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 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 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 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 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 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 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.

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.

This invention discloses a Na2Ti7O 15 Na₂Ti₃O₇ sodium titanate electrode material, its preparation method, and its application. This electrode material is a porous, blocky structure composed of stacked nanorods. It is synthesized by a simple solid-state method, where sodium carbonate precursor and anatase titanium dioxide are ball-milled in a specific ratio and then microwave-sintered in air. 15 The addition of [a specific ingredient] increases the exposure of the (100) sodium storage crystal face in Na2Ti3O7 sodium titanate, while decreasing the exposure of the (003) crystal face; Na2Ti7O 15 The presence of four TiO6 octahedrons within a single structural unit increases the number of sodium storage sites and widens the sodium ion diffusion channels, thereby improving the material's specific capacity and rate performance. (Na2Ti7O) 15 The two layers of TiO6 octahedrons are interconnected, making the structure more stable during sodium ion insertion / extraction, thereby increasing the long-term cycling stability of the material.

The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a high-entropy oxide ceramic material and a preparation method thereof. The chemical expression formula of the high-entropy oxide ceramic material is (CrMnFeCoNi) 3O4. The preparation method of the high-entropy oxide ceramic material comprises the following steps: taking Cr2O3 powder, MnO powder, FeO powder, Co3O4 powder and NiO powder as raw materials, and weighing the raw materials according to the stoichiometric ratio of the chemical expression of (CrMnFeCoNi) 3O4; the preparation method comprises the following steps: performing wet ball-milling and mixing on the raw materials, and drying to obtain precursor powder; and carrying out microwave sintering on the precursor powder to obtain the high-entropy oxide ceramic material. According to the invention, microwave sintering is adopted, and the inside and outside of the material are uniformly heated through rapid response of Fe, Co and Ni to microwaves; and full diffusion and reaction of each metal oxide at a high temperature are promoted, so that formation of a non-uniform phase is avoided.

The application relates to the technical field of high-performance ceramic powder, in particular to a low-dielectric-loss ceramic powder and a preparation method thereof. x Mg 1‑x ZrO3-CaZrO3. The preparation process is improved, sintering aids are added, and microwave sintering is used, so that the compactness of the ceramic is improved, the pores of the matrix are reduced, the grain size distribution is more uniform, and thus the quality factor of the microwave dielectric ceramic is improved.

According to an embodiment, by using a pellet capable of microwave absorption and heat dissipation, the temperature is increased to 900° C. or higher in a short period of time, and a vapor-phase sintering agent rapidly diffused from the pellet can accelerate the sintering of a PCEC. Specifically, the sintering temperature is reduced by 500° C. or higher compared to the existing process, and the time is also shortened from 300 minutes to 5 minutes, thereby resolving the cationic segregation phenomenon that occurs in the existing sintering process, and thus improving the performance of a PCEC.

The application belongs to the field of inorganic non-metallic material synthesis, and particularly relates to an equimolar ratio seven-element high-entropy oxide and a preparation process thereof. The preparation process comprises the following steps: seven oxide powders Al2O3, Y2O3, TiO2, ZrO2, NiO, CuO and CeO2 are put into a ball mill tank according to a molar ratio of 1:1:2:2:2:2:2, and anhydrous ethanol and zirconium oxide grinding balls are added, ball milling is carried out in a ball mill, and after the ball milling is completed, the mixture is fully dried, sieved, and a mixed powder is obtained; the mixed powder is subjected to tabletting treatment, and a green body to be fired is obtained; the green body to be fired is placed in an alumina crucible and put into a microwave oven for microwave sintering. The application obtains an equimolar ratio seven-element high-entropy oxide (AlYTiZrNiCuCe)Ox with good solid solution, improves the crystallinity and element uniformity of the seven-element high-entropy oxide, and fully reacts various raw materials, while the process is high in efficiency and low in energy consumption.

The utility model discloses a device for sintering and solidifying heavy metals in polluted soil. The device comprises a sintering furnace body, a plurality of material flowing plates and a plurality of microwave heating pipes, the sintering furnace body is of a hollow rotary cavity structure, a feeding port is formed in the upper portion of the sintering furnace body, and a discharging port is formed in the lower portion of the sintering furnace body. A plurality of material flowing plates are arranged below the feeding port and above the discharging port, and a plurality of microwave heating pipes are arranged in the center of the interior of the sintering furnace body. Polluted soil is sintered and solidified in a microwave sintering mode, the device is suitable for sintering granules, the sintering efficiency is high, and the electricity consumption is obviously lower than that of a traditional electric furnace. According to the specific structure, the vertical sintering furnace is adopted, continuous operation can be achieved, the flowing speed of particles is slowed down through the multiple material flowing plates, meanwhile, waste heat of equipment can be effectively used for preheating the particles, the microwave heating pipes achieve sufficient sintering in a stepped discharging and multiple heating mode, and the curing effect is achieved.

The application provides a kind of silicon carbide ceramic material based on gradient activation sintering and nanocomposite reinforcement and its preparation method and application, the preparation method includes: silicon carbide raw materials are mixed and ball milled to obtain sintering raw materials, the sintering raw materials are sequentially subjected to magnetic field strengthening sintering, pressure sintering and microwave sintering, SiC nanowires grow in the pressure sintering, and finally obtain silicon carbide ceramic material. The preparation method provided by the application is subjected to segmented sintering under the intensification of magnetic field, pressure and microwave respectively, the sintering powder is activated, particle arrangement and growth are promoted by using specific intensification means in different sintering stages, the densification of silicon carbide ceramic is improved, and SiC nanowires grow in the sintering process, so that the mechanical properties and thermal properties of silicon carbide ceramic material are significantly improved.

The invention provides a movable microwave sintering device and a method for preparing light aggregate by utilizing polluted soil, and belongs to the technical field of industrial polluted soil treatment. The movable microwave sintering device provided by the invention comprises an integrated granulation module and an integrated sintering cooling module, the integrated granulation module comprises a drying and screening module, a grinding-mixing module and a granulation module which are horizontally and fixedly connected in sequence; the first discharge port is connected with the second feed port, and the second discharge port is connected with the third feed port; the integrated sintering and cooling module comprises a microwave sintering module and a cooling-tail gas treatment module which are horizontally and fixedly connected; the fourth discharging hole is connected with the fifth feeding hole; and the third discharge port is connected with the fourth feed port. The device provided by the invention is integrated equipment capable of realizing in-situ treatment of the polluted soil, and has the characteristics of high efficiency and low sintering temperature.

The invention provides a solid waste-based high-temperature heat storage material and a gradient coating-multi-field synergistic microwave uniform sintering method thereof, and belongs to the technical field of preparation of high-temperature heat storage materials. The method comprises the following steps: adding a polyvinyl alcohol pore-forming agent into a solid waste matrix, carrying out vacuum drying after ball milling, and pressing to obtain a green body; carrying out heat treatment on the green body in a holding furnace through an in-situ reaction synthesis method, and naturally cooling to room temperature to prepare a pre-sintered material; carrying out modification treatment on the surface of the pre-sintered material by adopting Ar / O2 mixed gas plasma, and forming a plasma modified functional layer on the surface of the pre-sintered material; carrying out gradient coating on the surface of the plasma modified functional layer to form an MgO / SiC coating layer; and carrying out microwave sintering treatment on the gradient coated material to obtain the solid-waste-based high-temperature heat storage material. Through the gradient coating layer structural design and in combination with multi-mode microwave field dynamic regulation and control and a temperature-power closed-loop control system, not only is the wave absorbing performance of the material optimized, but also the matching of the microwave penetration depth and the thermal diffusion rate is ensured.

The invention discloses a ternary gradient composite glass ceramic nuclear battery core based on radiation field coordinated regulation and a preparation method thereof. The core includes a base material, a radiation stabilizer, and an active component. The active components comprise three radioactive isotopes, namely caesium-137, americium-241 and curium-244. The active component is distributed in the matrix material in the form of core-shell nanoparticles. The composite nanoparticle is a basic unit of the core provided by the invention, is of a core-shell structure with an isotope core coated with a ZrO2 shell layer, and comprises the isotope core in the center and the ZrO2 shell layer wrapping the periphery of the isotope core. According to the preparation method, a sol-gel method is combined with microwave sintering and hot isostatic pressing treatment, so that nanoscale uniform dispersion, extreme densification and extremely low isotope volatilization are realized. The core body has the excellent characteristics of high power density, ultra-long service life and wide temperature range operation, and solves the problems of non-uniform distribution and radiation imbalance in a multi-element isotope system.

The present invention is based on Na2Ti7O 15 This paper describes a doped sodium titanate electrode material, its preparation and use. The electrode material has a porous block structure stacked with nanorods and is synthesized by a simple solid-state method using proportional ball milling of precursors sodium carbonate and anatase titanium dioxide followed by microwave sintering in air. The resulting Na2Ti7O 15 The addition of Na increases the exposure of the (100) sodium storage crystal plane of Na2Ti3O7 sodium titanate and decreases the exposure of the (003) crystal plane, resulting in Na2Ti7O 15 has four TiO6 octahedra in one structural unit, providing more sodium storage sites and wider sodium ion diffusion channels, improving the specific capacity and rate performance of the material. 15 The TiO6 octahedra in the upper and lower layers are connected to each other, making the structure more stable during the sodium ion insertion / extraction process, thereby improving the long-term cycling stability of the material.

The invention belongs to the field of lead-acid batteries, and particularly relates to a lead storage battery and a CNT reinforced lead-based grid, a preparation method and application thereof, and the preparation method of the CNT reinforced lead-based grid comprises the following steps: mixing CNT and lead powder to obtain a mixture; the mixture is pressed and formed and then subjected to microwave sintering in the protective gas atmosphere, and a carbon nano tube-lead composite middle prefabricated block is obtained; and adding the CNT-lead composite intermediate precast block into molten lead liquid, carrying out ultrasonic cavitation treatment, and then carrying out pouring molding, so as to obtain the CNT reinforced lead-based grid. According to the method disclosed by the invention, the strength and toughness of the material are remarkably improved, the material has excellent mechanical properties, and the excellent discharge current density and super-long cycle life of the lead-acid storage battery can be improved.

The application discloses an aluminum nitride ceramic substrate of a composite sintering aid and a preparation method thereof, and relates to the technical field of ceramic materials. The sintering aid is prepared by compounding zirconium boride whiskers, rare earth oxides and rare earth fluorides. The whisker structure advantage is utilized to improve the bending strength of the substrate. The sintering aid can be used as a liquid phase promoter in the sintering process, so that the diffusion activation energy of aluminum nitride particles is reduced. Meanwhile, the zirconium boride and the aluminum nitride can form a uniform interface through chemical bonding, so that the compactness of the substrate is increased, and the thermal conductivity and the mechanical properties are improved. In the discharge plasma sintering or the microwave sintering, the rapid heat transfer characteristics of the zirconium boride whiskers are highly matched with the heating mechanism of the pulse current or the microwave field, so that the performance of the aluminum nitride substrate is further enhanced.