202 results about "Microwave sintering" patented technology

The invention belongs to the technical field of powder metallurgy, and particularly relates to a high-strength tungsten alloy wire and a preparation method thereof, lanthanum oxide is uniformly doped through a ball-milling mixing and microwave sintering method, the recrystallization temperature of tungsten crystal grains is reduced by coordinating logarithmic strain of a rotary hammer, an annealing process and the like, the tungsten crystal grains uniformly grow, and the high-strength tungsten alloy wire is prepared. The wire diameter of the high-strength tungsten alloy wire is smaller than 30 microns, the tensile strength of the high-strength tungsten alloy wire is larger than or equal to 6200 MPa, and the percent of pass of the high-strength tungsten alloy wire is larger than or equal to 80%.

Systems and methods for fabrication of ceramics from celestial materials using microwave sintering and mechanical compression for space mining applications are disclosed. In one aspect, a chamber for sintering loose mineral material into solid ceramic shapes includes a plurality of zirconia insulting plates configured to clamp the mineral material and forming a cavity in which the mineral loose material is contained, and at least one dipole array configured to generate microwave energy and apply the microwave energy to the mineral material.

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 invention belongs to the technical field of inorganic non-metallic materials, and discloses a method for microwave synthesis of silicon carbide whiskers from a porous precursor, which comprises the following steps: mechanically stirring and mixing a silicon source and a carbon source according to a carbon-silicon molar ratio of (3-25): 1, and obtaining the porous precursor by adopting a certain forming process and a certain pore-forming process; the porous precursor is wrapped with quartz powder and placed in a microwave sintering furnace to be sintered, a sample is subjected to heat preservation for 15-25 min at the temperature of 900-1350 DEG C, and the three-dimensional silicon carbide whiskers are prepared. A silicon source and a carbon source are mixed and molded in the form of a porous precursor and then are subjected to microwave heating, in the microwave heating process, excited microwave plasmas enter pores in a three-dimensional multidirectional form, gas in the pores is quickly accumulated under the action of buried powder, the air pressure is quickly increased, the plasmas are promoted to generate an instantaneous gas-phase reaction, and the pore-forming effect is improved. And the three-dimensional silicon carbide crystal whiskers with good crystal development are formed by virtue of sufficient space in the holes.

The invention relates to the technical field of electronic ceramics, in particular to a low-cost ultra-low dielectric microwave dielectric ceramic material and a preparation method thereof.The low-cost ultra-low dielectric microwave dielectric ceramic material comprises, by mass, 4.1% of MgO, 36.4% of H2SiO3, 31.5% of Al2O3 and 28% of talc, talcum powder and Al2O3, H2SiO3 and MgO with the purity larger than or equal to 99% serve as initial raw materials, the microwave dielectric material Mg2.15 Al4Si5O18.15 is prepared through a solid-phase sintering method, and the microwave dielectric ceramic material is prepared through a microwave sintering method. The microwave performance of the material is excellent, the dielectric constant epsilon r is 3.82-4.42, the quality factor Q * f is 36653-64628 GHz, and the temperature coefficient of resonance frequency tau f is-26.02--24.80 ppm / DEG C. The ultra-low dielectric microwave dielectric ceramic material adopts talc to replace part of a silicon raw material and a magnesium raw material, the content of the silicon raw material and the magnesium raw material is greatly reduced, compared with the silicon raw material and the magnesium raw material, the talc is extremely low in cost, and the cost is low. The raw material cost is reduced, the preparation is easy, and great commercial potential is achieved. In addition, the added value of talc is improved, and development of related industries is promoted.

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 belongs to the technical field of pyroelectric infrared detection, and particularly relates to a high Curie temperature lead-based pyroelectric material and a preparation method thereof, the chemical composition of the high Curie temperature lead-based pyroelectric material is Pb (Zr0. 9Ti0. 1) O3-xK2CO3, and x is more than or equal to 0.0 and less than or equal to 1.5% (mol). K2CO3 is doped into a PZT substrate, K < + > enters a crystal lattice and then replaces Pb < 2 + > at an A site to form an oxygen vacancy, polarization overturning is hindered, and the dielectric constant and the dielectric loss are reduced. As the radius of K < + > is larger than that of Pb < 2 + >, lattice distortion is further intensified, the polarization characteristic of the material is improved, and the material shows high pyroelectric performance and good temperature stability. In order to avoid element volatilization and reduce the sintering cost, a microwave sintering method is adopted, and the high-Curie-temperature lead-based pyroelectric ceramic material with good consistency can be efficiently prepared at low cost through process adjustment.

The invention discloses a microwave sintering method and microwave sintering equipment for a ceramic roller, and relates to the technical field of ceramic roller preparation. The microwave sintering method comprises the following steps that a microwave multi-mode resonant cavity is adopted for microwave sintering, the microwave multi-mode resonant cavity comprises a sintering cavity and an outer cavity from inside to outside, the outer cavity is provided with a focusing reflector, and a heating area, a sintering area and a cooling area are sequentially formed in the sintering cavity from top to bottom; a microwave source is started, the working frequency and power of the microwave source are adjusted, and the temperature of the sintering area is made to range from 1200 DEG C to 1600 DEG C; the auxiliary heating base is placed in the sintering cavity; and enabling the ceramic roller to enter and pass through the sintering cavity at the speed V1 to be subjected to microwave sintering while keeping the rotary motion, so as to obtain the microwave sintered ceramic roller. According to the microwave sintering method and microwave sintering equipment for the ceramic roller, effective microwave sintering can be conducted on the aluminum oxide ceramic roller, the microwave sintering temperature reaches 1200 DEG C or above, and the ceramic roller can be heated more evenly through dynamic continuous sintering.

The invention relates to a preparation method of an ultra-dispersion nano titanium carbide particle reinforced titanium-based composite material, which comprises the following steps: carrying out die forming on mixed powder of sub-ten nano-scale graphene and a titanium matrix, carrying out vacuum microwave sintering, and carrying out extrusion thermal deformation treatment to obtain the ultra-dispersion nano titanium carbide particle reinforced titanium-based composite material. The microstructure reveals that the nano-scale titanium carbide particles generated by the in-situ reaction are uniformly distributed in the matrix crystal. The prepared ultra-dispersed nano titanium carbide reinforced titanium-based composite material shows excellent mechanical properties and has excellent strength and plasticity, the tensile strength at the room temperature can reach 1030-1150 MPa, and the performance is obviously improved compared with pure titanium.

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 a preparation method and application of a CeCo / AC catalyst for removing NO by coupling CO and NH3 at a low temperature, and belongs to the technical field of flue gas purification. An A-site doped carrier of the CeCo / AC catalyst is a Co / AC catalyst, A-site doped metal is Ce, the total mass of Co and the A-site doped metal Ce is 2-4% of the mass of the AC carrier, and the molar weight of Co accounts for 20-80% when the total molar weight of Co and the A-site doped metal Ce is 100%. According to the method, Ce is loaded to the Co / AC catalyst to realize A-site doping by adopting surface oxidation pretreatment, an impregnation method, microwave sintering and plasma surface treatment, so that NO is removed by coupling low-temperature CO and NH3, low-temperature activation is realized, and the low-temperature NO removal capability is improved. The catalyst provided by the invention has the characteristics of high NO removal efficiency, environmental protection, no pollution, developed catalyst void structure, good dispersibility of each metal oxide and the like.

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 discloses a sodium ion battery oxide single crystal positive electrode material and a preparation method and application thereof, and belongs to the technical field of battery materials. The chemical formula of the prepared positive electrode material is Na Fe < x > Mn < y > M < z > NO2, a < = 1.1, 0.4 < = x < = 1, 0 < = y < = 1, M is a doping element, 0.005 < = z < = 0.11, and N is a coating element. The positive electrode material provided by the invention is prepared by adopting an efficient microwave sintering mode without using expensive noble metals such as nickel, cobalt and copper as raw materials, so that the price of the positive electrode material of the sodium-ion battery can be reduced by more than 50% compared with the existing price, and the preparation efficiency is improved by more than 6 times; meanwhile, the prepared sodium-ion battery positive electrode material has good single crystal morphology and relatively high discharge capacity and cycle index, so that the cost of the sodium-ion battery can be greatly reduced, the performance of the sodium-ion battery can be improved, and large-scale popularization and application of the sodium-ion battery are facilitated.

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 of a magnesium-based graphene absorbable stent composite material. The preparation method comprises the following steps: step 1, ultrasonic treatment of graphene; 2, preparing raw materials of the magnesium-based material; step 3, ball milling processing; step 4, vacuum drying; 5, composite die pressing is carried out; step 6, microwave sintering; step 7, performing high-pressure synthesis; and 8, carrying out solid temperature extrusion. According to the preparation technology of the magnesium-based graphene composite material, the performance of the composite material can be adjusted by controlling the addition amount of the graphene, the temperature and time of the heating reaction, the conditions of high-pressure deposition and the like, the dispersity and compatibility of the graphene with magnesium powder, zinc powder and calcium powder can be improved by adopting the organic solvent and the coupling agent, and the magnesium-based graphene composite material is prepared. The preparation technology is simple in process, low in cost and high in efficiency, and the prepared magnesium-based graphene composite material has excellent mechanical properties, heat conductivity and electric conductivity and can be widely applied to the technical fields of medicine, aerospace, automobiles and electronic products.

The invention relates to the technical field of hard alloy cutters, in particular to a hard alloy cutter and a preparation method thereof. Comprising the following raw materials: 60-70 parts of WC powder, 8-12 parts of Ni powder, 5-8 parts of Mo2C powder, 2-4 parts of Si3N4 powder, 6-10 parts of a strengthening phase and 4-8 parts of an improved additive. Comprising the following steps: S1, weighing raw materials; s2, mixing and stirring WC powder, Ni powder, Mo2C powder and Si3N4 powder, performing ball milling, drying, performing compression molding in a mold to obtain a green body, putting the green body into a tubular furnace, performing sintering treatment under nitrogen, and performing grinding and sieving to obtain an intermediate product; and S3, the intermediate product, a strengthening phase and an improved additive are mixed, stirred and dried, compression molding is conducted in a mold, microwave sintering is conducted under argon, and the hard alloy cutter is obtained. The prepared hard alloy cutter has excellent toughness and wear resistance, meanwhile, the high strength characteristic can be effectively kept, and the service life of the alloy cutter is remarkably prolonged.

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%.

A Na2Ti7O15 doped Na2Ti3O7 sodium titanate electrode material, and a preparation method therefor and a use thereof. The electrode material has a porous block structure formed by stacking nanorods. The electrode material is synthesized by a simple solid-phase method, and is obtained by carrying out ball milling on precursors sodium carbonate and anatase-phase titanium dioxide in proportion, and then carrying out microwave sintering in air; the addition of Na2Ti7O15 increases the exposure of (100) sodium storage crystal face and decreases the exposure of (003) crystal face of Na2Ti3O7 sodium titanate; and Na2Ti7O15 has four TiO6 octahedrons in one structural unit, and has more sodium storage sites and wider sodium-ion diffusion channels, thereby improving the specific capacity and rate performance of the material. Upper and lower layers of TiO6 octahedrons in Na2Ti7O15 are connected to each other, such that the structure is more stable in a sodium-ion intercalation / deintercalation process, thereby improving the long cycle stability of the material.

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 discloses a rare earth barium copper oxide superconducting target material and a preparation method thereof. The preparation method comprises the following steps: S1, mixing rare earth salt, barium salt and copper salt to obtain a rare earth barium copper oxide precursor; wherein the purity of the rare earth salt, the barium salt and the copper salt is greater than 99.9%, and the molar ratio of the rare earth metal to the barium to the copper is 1: 2: 3; s2, performing microwave calcination on the rare earth barium copper oxide precursor to obtain rare earth barium copper oxide single-phase powder; wherein the power of the microwave calcination is 100-2000W, and the time of the microwave calcination is within 30min; s3, carrying out mold pressing and cold isostatic pressing on the rare earth barium copper oxide single-phase powder to obtain a rare earth barium copper oxide superconducting target material blank; wherein the mold pressing pressure ranges from 10 MPa to 20 MPa, and the cold isostatic pressing pressure ranges from 100 MPa to 300 MPa; and S4, carrying out microwave sintering on the rare earth barium copper oxide superconducting target material green body to obtain the rare earth barium copper oxide superconducting target material. Wherein the frequency of the microwave sintering is 2.45 GHz, the power of the microwave sintering is 100-1000 W, and the time is within 25 min.

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 an aluminum capacitor anode foil based on microwave sintering, the method comprising: 1. dispersing nano aluminum powder in ethylene glycol and adding sodium tripolyphosphate solution for ultrasonic dispersion, drying to obtain surface-treated nano aluminum powder; 2. mixing the surface-treated nano aluminum powder with a dispersant, a binder, and a film-forming agent to obtain aluminum paste; 3. coating the aluminum paste on an aluminum foil substrate and drying and curing; 4. microwave sintering to obtain a sintered foil; 5. boiling the sintered foil and drying it; 6. soaking it in a diammonium phosphate solution; 7. chemical treatment to obtain an aluminum capacitor anode foil. The invention adopts a microwave sintering method to complete the sintering process under low-temperature and fast conditions, avoiding the abnormal growth of grains of aluminum powder during long-term, high-temperature sintering, promoting the uniform distribution of aluminum powder in the sintered foil, ensuring the porosity of the sintered foil, thereby improving the capacitance and anti-bending performance of the aluminum capacitor anode foil, and meeting the requirements for use in medium and high voltage environments.

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.