2204 results about "Green body" patented technology

The invention discloses a preparation process of an aluminum oxide ceramic material, which comprises the following steps: S1, pretreatment of aluminum oxide powder: taking alpha-Al2O3 powder as a raw material, adding a dispersion medium, carrying out ball milling, transferring into an ultrasonic dispersion machine, dispersing, and further carrying out vacuum drying to obtain pretreated aluminum oxide powder; s2, chemical activation treatment: weighing pretreated aluminum oxide, magnesium oxide, nano silicon dioxide, calcium oxide, zirconium dioxide, titanium dioxide and modified nano silicon carbide in parts by weight, mixing, sequentially adding a dispersing agent absolute ethyl alcohol and a KH550 silane coupling agent, stirring at a high speed, adding a polyvinyl alcohol binder, and continuously stirring to obtain ceramic slurry; s3, sieving the ceramic slurry, filling the ceramic slurry into a mold, and performing isostatic pressing to obtain a ceramic green body; and S4, putting the ceramic green body into a box-type sintering furnace, sintering step by step, and cooling to room temperature along with the furnace to obtain the aluminum oxide ceramic material. The prepared aluminum oxide ceramic material has high compactness, excellent dielectric strength and mechanical property, low energy consumption and great application potential.

The invention belongs to the technical field of building materials, and particularly relates to a preparation method of a high-strength sintered tile. The preparation method of the high-strength sintered tile comprises the following steps: (1) crushing green body raw materials, sieving, adding water, carrying out ball milling, and carrying out spray drying to obtain powder; (2) performing compression molding on the powder obtained in the step (1) to obtain a green body; drying the green body to obtain a tile blank; (3) coating the tile blank obtained in the step (2) with glaze, and drying to obtain a glazed tile blank; and sintering the glazed tile blank, and then cooling to room temperature to obtain the ceramic tile. The high-strength sintered tile obtained by the preparation method is high in bending strength, high in thermal stability, low in water absorption and good in freezing resistance, and has a wide application prospect.

The invention relates to the technical field of high-performance ceramic preparation, in particular to a partial pressure sintering method of a silicon nitride ceramic chip, which comprises the stages of charging, negative pressure degreasing, partial pressure sintering, pressure sintering and rapid cooling: during charging, charging a green body containing a silicon nitride raw material and Y2O3 and MgO auxiliaries into a furnace, and exhausting air; in the negative-pressure degreasing stage, low-pressure nitrogen and staged heating are used for promoting formation and volatilization of an auxiliary liquid phase; volatile matters are released through stepped nitrogen partial pressure in the partial pressure stage; in the pressurizing stage, gradient increase of pressure from low pressure to 35 bar is achieved through phase change buffering, high-temperature densification, ultra-high-temperature homogenization and slow cooling, and precise pressure control is achieved by combining dynamic pressure-static pressure mode switching; according to the method, the problems of cracking, uneven density and the like of a traditional process are effectively solved, the ceramic chip yield and the dimensional precision are improved, the microstructure and the mechanical property are optimized, the high-temperature applicability and the thermal property are enhanced, meanwhile, the use amount of auxiliaries is reduced, energy consumption is reduced, and practicability and economical efficiency are achieved.

The invention discloses a temperature field real-time monitoring method and system based on special ceramic sintering, and relates to the field of temperature monitoring of special ceramic sintering, and the method specifically comprises the following steps: S1, processing a sensor array; s2, construction of multi-parameter data acquisition; s3, a temperature field reconstruction and prediction model based on multi-physics field coupling; and S4, temperature field real-time monitoring and abnormity early warning are carried out. According to the temperature field real-time monitoring method and system based on special ceramic sintering, the temperature sensor is preset in the green body, a three-dimensional temperature field reconstruction function is combined, discrete sensor node real-time temperature data can be converted into a continuous three-dimensional temperature field cloud picture, temperature distribution of the surface of the green body can be clearly presented, and the temperature field can be monitored in real time. And the temperature gradient change from the surface layer to the core can be more accurately restored, so that an operator can intuitively master the temperature state of the whole green body, the situation that the whole process is misjudged due to local data is avoided, and the comprehensiveness and accuracy of temperature field monitoring are fundamentally improved.

The invention belongs to the technical field of heating bodies, and particularly relates to a method for preparing a sheet-shaped heating body. The preparation method comprises the following steps: stirring and dissolving lanthanum nitrate, strontium nitrate, manganese nitrate hexahydrate and a solvent to obtain a metal salt solution; preparing the metal salt solution into a precursor, wherein the precursor is a precursor solution or precursor sol; and carrying out tape casting and drying on the precursor to obtain a biscuit sheet, and carrying out glue removal treatment and sintering on the biscuit sheet to obtain the sheet-shaped heating body. According to the preparation method, a precursor system is optimized, the dispersion stability of the precursor is improved, casting, drying and sintering processes are matched, the problem of powder agglomeration is solved, the defects of green bodies are reduced, the drying shrinkage rate of green body pieces in the preparation process is reduced, the surface roughness is reduced, the stability and heat output uniformity of a heating body are improved, and the compactness is improved.

The invention discloses a continuous rotary discharging ceramic green body rolling forming device, and relates to the technical field of ceramic green body rolling forming, the continuous rotary discharging ceramic green body rolling forming device specifically comprises a rolling frame, a transverse driving table and a vertical driving table, the transverse driving table is installed at the top of the rolling frame, and the vertical driving table is installed at the top of the transverse driving table; the top of the vertical driving table is slidably connected with a sliding base plate. Through the 120-degree intermittent rotation design of the rotary table, circulating switching of the three stations of blank adding, rolling forming and discharging is achieved, the neutral position period of shutdown blank taking in the traditional technology is eliminated, compared with the prior art, the ceramic blank rolling forming efficiency is improved by 20%, uninterrupted continuous production is achieved, meanwhile, traditional pressing contact type rolling forming is different, and the production efficiency is improved. A mechanical linkage mechanism, a cam, a U-shaped tilting rod and a toothed plate are adopted to automatically control lifting and rotation of a female die, and a driving assembly is matched to drive a male die to synchronously rotate, so that the rolling precision is ensured.

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 method for preparing a light-transmitting gradient multicolor zirconium oxide material through photocuring, which comprises the following steps: preparing modified aluminum oxide which is formed by attaching a strontium element and a chromium element to the surface of aluminum oxide; preparing bottom-layer slurry, middle-layer slurry and upper-layer slurry from the zirconium-aluminum powder; the bottom layer slurry comprises zirconium aluminum powder and a coloring agent; the middle layer slurry comprises zirconium-aluminum powder, a light-transmitting auxiliary agent and a coloring agent; the upper-layer slurry comprises zirconium-aluminum powder, a light-transmitting auxiliary agent and a coloring agent; preparing a bottom layer green body by using the bottom layer slurry through 3D printing by using the photocuring slurry, preparing a middle layer green body on the surface of the bottom layer green body by using the middle layer slurry, and preparing an upper layer green body on the surface of the middle layer green body by using the upper layer slurry, so as to obtain a zirconium oxide material green body; the light-transmitting gradient multicolor zirconia material with gradient light transmission and gradient color is directly prepared through 3D printing, the color of the light-transmitting gradient multicolor zirconia material is closer to that of real teeth, and the strength and toughness are not reduced.

The invention discloses a preparation method of thermal shock resistant magnesium aluminate spinel transparent ceramic, and belongs to the technical field of ceramic materials. The preparation method comprises the following steps: (1) synthesizing crystalline MgAl2O4 nano powder by adopting an additive-free hydrothermal method; (2) depolymerizing the powder, performing water-based gel casting to prepare a green body, and performing staged debonding treatment on the green body; (3) carrying out two-step vacuum presintering on the green body; (4) carrying out hot isostatic pressing densification treatment in a subgrain growth temperature region of 1380-1420 DEG C; and (5) carrying out annealing treatment on the densified ceramic. High-purity crystalline powder is synthesized through an additive-free hydrothermal method, grain boundary impurities are eliminated, and the intermediate infrared transmittance is remarkably improved; by combining the synergistic effect of optimized two-step pre-sintering and hot isostatic pressing in a sub-grain region, precise refinement of the grain size is realized; and finally, the bending strength, the fracture toughness and the critical thermal shock temperature difference of the material are greatly improved under the strengthening mechanism of ultrafine grains and defect-free grain boundaries.

The invention relates to the technical field of nano ceramic materials, and particularly discloses a self-cleaning antibacterial functional ceramic which is prepared by the following steps: S1, mixing titanium dioxide powder, a composite binder, functional gel, a plasticizer and a solvent, and performing ball milling for 18-20 hours to obtain composite slurry; s2, putting the composite slurry into a mold, and carrying out mold pressing and drying to obtain a green body; and S3, placing the green body in a high-temperature sintering furnace, carrying out high-temperature sintering, and cooling to room temperature to obtain the self-cleaning antibacterial functional ceramic, according to the invention, functional gel and a composite binder are added, and the functional gel is obtained by mixing and reacting composite modified nano zinc oxide, a cross-linking agent and an alumina precursor; the composite binder is prepared by mixing a polyvinyl alcohol aqueous solution, an aluminum dihydrogen phosphate aqueous solution, silica sol and a tackifying component, and through the synergistic effect of the substances, the mechanical property and the antibacterial property of the functional ceramic are improved.

The invention is suitable for the technical field of powder metallurgy and advanced ceramic material sintering equipment, and provides an integrated flash sintering device for vacuum and a sintering method. The device comprises a power supply module, a high vacuum module, a first servo hydraulic machine, a second servo hydraulic machine, a third servo hydraulic machine, a mold rotation switching module, a vacuum feeding module, a green body pressing module, a demolding and mold cleaning module and a mold transfer module. According to the invention, an integrated gear tray design is adopted to integrate the functions of die installation, graphite paper treatment and green body pressing, and online synchronous cleaning of an electrode and a die is realized through die fixation and a cleaning brush arranged in a cleaning drum; therefore, full-automatic, high-efficiency and high-stability continuous production of flash sintering from powder filling to finished product collection is realized.

The invention relates to the technical field of ceramic materials, and discloses antibacterial self-cleaning domestic ceramic and a preparation method thereof. The preparation method comprises the following steps: S1, mixing a ceramic green body raw material, an antibacterial precursor and an auxiliary agent, performing ball milling to obtain slurry, performing slip casting on the slurry to obtain a green body, and drying to obtain the green body; s2, carrying out gradient in-situ reaction sintering on the green body, and sintering at the temperature of 400-600 DEG C; then sintering at the temperature of 800 to 1000 DEG C; then sintering at the temperature of 1100 to 1250 DEG C; s3, after sintering, micron-sized pits are formed in the surface of the ceramic body through plasma etching; and S4, glazing: sintering at 700-900 DEG C to combine the glaze with the biscuit, thereby obtaining the antibacterial self-cleaning domestic ceramic. The preparation process is simple, long-acting synergism of antibacterial and self-cleaning performance is achieved, and firm combination of the functional layer and the ceramic matrix is achieved.

The invention discloses an injection molding high-density alloy steel sintering integrated preparation process, which comprises the steps of alloy raw material proportioning, feed preparation, injection molding, continuous thermal desorption sintering treatment and enhanced heat treatment, and comprises the following steps: selecting gas atomization pure iron powder subjected to vacuum reduction treatment, and matching with chromium, nickel, molybdenum, vanadium, carbon, silicon, manganese and iron powder multi-component alloy proportioning; a phenolic resin-polyformaldehyde composite binder is adopted, 0.5-1.5% of a lubricating additive is added, internal mixing parameters are controlled under the protection of inert gas according to the powder-to-rubber ratio of 72-77%: 23-28%, and the problem that the compatibility of a single binder and alloy powder is poor is solved; three-section gradient temperature control injection molding and a continuous atmosphere furnace sectional degreasing-sintering integrated process are combined, and strengthening heat treatment is matched, so that sufficient diffusion of elements and densification of a green body are realized, and defects are avoided. The technology effectively solves the technical problems that traditional raw materials are high in impurity content and insufficient in element diffusion, and therefore the alloy steel sintering preparation efficiency can be improved.

The invention belongs to the technical field of ceramic materials, and relates to high-thermal-conductivity silicon nitride ceramic and a preparation method thereof. The invention discloses a preparation method of high-thermal-conductivity silicon nitride ceramic, which comprises the following steps: (1) uniformly mixing silicon powder and a sintering aid to obtain mixed powder, and carrying out compression molding on the mixed powder to obtain a silicon blank; the sintering aid is a rare earth metal oxide; (2) placing the silicon blank in a nitrogen-containing reducing atmosphere environment, pre-treating at 600-1180 DEG C, heating to 1350-1700 DEG C, and carrying out nitriding treatment to obtain a silicon nitride blank; and (3) placing the silicon nitride green body in an inert atmosphere, and sintering at 1800-2200 DEG C to obtain the silicon nitride ceramic. The pretreatment step is added before the nitridation reaction, so that silicon dioxide impurities wrapped on the surface of the silicon powder are effectively eliminated, and the oxygen content in a liquid phase is reduced on the basis of not reducing the total content of a sintering aid, so that a silicon nitride blank with low lattice oxygen content is more easily prepared, and the heat conductivity of the silicon nitride ceramic is improved.

The invention relates to the technical field of ceramic materials, in particular to a method for reducing the surface roughness of a silicon nitride instant-fired sheet, which comprises the following steps: S1, mixing alpha-silicon nitride, beta-silicon nitride, absolute ethyl alcohol and herring fish oil, grinding and dispersing to obtain basic mixed powder; s2, mixing, grinding and dispersing the filling mixed powder, absolute ethyl alcohol and herring fish oil, then carrying out filter pressing and drying, calcining and regrinding to obtain ground filling mixed powder; s3, mixing and ball-milling the basic mixed powder, the ground filling mixed powder, a solvent, an adhesive, a plasticizer and a dispersing agent to obtain slurry; s4, casting the slurry into a film; s5, attaching the thin film to the surface of the silicon nitride green body, and pressing the silicon nitride green body into a whole piece through an isostatic press to obtain a pressed green body; s6, a boron nitride isolation layer is printed on the surface of the pressed green body, and the green body with the isolation layer is obtained; and S7, stacking the green bodies with the isolating layers, and then carrying out adhesive removal and sintering reaction to obtain the silicon nitride ceramic chip.

The invention provides a granulation raw material, a pre-sintered body, a zirconia porcelain block, a fast firing production method and application. The fast firing production method comprises the following steps: S1, providing a first zirconium oxide material and a second zirconium oxide material; s2, compounding the first zirconium oxide material and the second zirconium oxide material, and granulating together with an auxiliary material to obtain a granulation raw material; s3, obtaining a green body based on the granulation raw materials; s4, carrying out pre-sintering treatment on the green body to obtain a pre-sintered body; and S5, machining the pre-sintered body, and then carrying out fast firing treatment to obtain the zirconium oxide porcelain block. On the basis of compounding of granulation raw materials, the overall performance of the zirconia ceramic block can be improved while a pre-sintered body can be rapidly sintered.

The invention relates to the field of architectural ceramics, and discloses a tile with a flash and matte composite effect, which sequentially comprises a green body layer, a matte glaze layer, a pattern layer and a flash layer from bottom to top, the glossiness of the matte glaze layer is less than 6GU; the preparation raw materials of the flash layer comprise flash particles, and the flash particles comprise the following components in parts by weight: 60-80 parts of mica titanium pearl powder, 10-20 parts of coating aluminum powder and 5-10 parts of glass beads; and the particle size of the flash particles is 50-250 microns. According to the invention, the matte glaze is combined with the flash particles, the matte glaze provides a soft and convergent substrate, the flash particles form local and bright reflection points on a matte background, and the matte glaze and the flash particles are distinct in contrast and set off each other, so that the matte high-grade texture is kept, and the flexible flash bright points are added; and the complex aesthetic feeling of coexistence of a matte substrate and mineral crystal flash in natural stone is simulated to the greatest extent.

The invention belongs to the technical field of ceramic tiles, and particularly discloses a marble ceramic tile and a preparation method thereof. The marble ceramic tile sequentially comprises a green body layer, a cover glaze layer, a pattern layer and a marble glaze layer, the marble glaze layer is formed by marble glaze, and the marble glaze comprises a prefabricated material composed of first dry particles, second dry particles and protective glaze according to a specific proportion, wherein the first dry particles, the second dry particles and the protective glaze are different and have a specific range of initial melting temperature and particle size. By innovating the formula of the glaze layer, the prepared marble ceramic tile has stereoscopic impression and natural sense which are closer to those of natural marble, the glaze surface is fine and smooth, and meanwhile, the marble ceramic tile also has better wear resistance, antifouling property and acid-base resistance and has better application prospects.

The invention belongs to the technical field of graphite processing, and discloses a production process of large-size isostatic graphite for semiconductors, which comprises the following steps: S1, weighing raw materials such as needle coke and asphalt in proportion, crushing and grinding the raw materials through a crusher to reach the required conditions, then fully mixing the powdery raw materials with liquid asphalt by using a double-shaft kneading machine to obtain a mixture A; s2, filling a mold with the paste material, performing preliminary compaction through a vibration molding machine to prepare a green body, then putting the green body into an elastic mold, putting the elastic mold into an isostatic press, and under the uniform pressure of a high-pressure liquid medium, enabling the green body to be subjected to the same pressure in all directions so as to realize densification molding; through cooperation of structures such as the motor and the moving plate, when the motor is started to crush raw materials, the crushed raw materials on the surface of the sieve plate can be shaken, so that the raw materials cannot be accumulated at a certain position of the sieve plate to affect the screening effect, the raw materials are spread more uniformly, and the screening efficiency is improved.

The invention discloses an organic silicon heat-conducting gasket and a preparation method thereof, and the preparation method comprises the following steps: mixing and uniformly stirring an organic silicon matrix, a heat-conducting filler, a nano material and a fibrous reinforcing filler to obtain mixed slurry; wherein the organic silicon matrix accounts for 10 to 50 parts; 20 to 80 parts of a heat-conducting filler; 1 part to 10 parts of a nano material; 1 part to 10 parts of fibrous reinforcing filler; the heat-conducting filler comprises surface-modified flaky boron nitride; the mixed slurry is subjected to multiple times of blade coating, forming and curing on a substrate, and an organic silicon heat conduction blank with sheet-shaped boron nitride oriented in the thickness direction is obtained; and cutting the organic silicon heat-conducting green body along the direction perpendicular to the blade coating plane to obtain the organic silicon heat-conducting gasket which is provided with a heat-conducting network in vertical orientation. According to the organic silicon heat-conducting gasket disclosed by the invention, extremely high heat conductivity coefficient can be obtained in the vertical direction by using relatively low heat-conducting filler content; meanwhile, the compression resilience of the gasket is obviously improved.

The invention belongs to the technical field of architectural ceramics, and particularly relates to a tempered high-strength impact-resistant ceramic sheet and a preparation method thereof. The toughened high-strength impact-resistant ceramic thin plate comprises a ceramic thin plate blank and a toughened coating which is arranged on the surface of the ceramic thin plate blank and is obtained by firing toughened coating slurry. A ceramic sheet reinforcing process is developed by referring to a stress structure of tempered glass, and the impact resistance and the bending strength of the material are remarkably improved by establishing the pressure stress layer on the bottom surface of the green body and cooperating with the pressure stress layer of the glaze layer, so that the application field of the ceramic sheet is widened.

The invention provides a method for preparing a high-performance silicon nitride ceramic ball based on a pressure modulation sintering technology, and relates to the field of functional ceramic material preparation, and the method comprises the following steps: 1, preparing a green body; 2, PMS sintering is carried out; step 3, cooling; traditional high-performance silicon nitride ceramic balls (the relative density is required to be larger than 99%, the Vickers hardness is required to be larger than or equal to 1500 kgf / mm, the bending strength is required to be larger than or equal to 920 MPa, and the fracture toughness is required to be larger than or equal to 6.0 MPa.m / ) are mainly prepared through a two-step process of normal pressure / air pressure sintering (GPS) and hot isostatic pressing (HIP). Although high densification of the material can be realized, the method has the problems of complicated process flow, high energy consumption, long production period, high equipment occupancy rate and the like.

The invention relates to the technical field of electrode paste, in particular to electrode paste for a submerged arc furnace and a preparation method of the electrode paste. Comprising three-level grain size distribution anthracite aggregate which is electrically calcined at high temperature and modified by a KH-550 silane coupling agent, a modified silicon carbide whisker and boron-doped graphene-like carbon nitride composite filler, a maleic anhydride-mediated compatible medium-temperature pitch-polyborosiloxane binder and a graphite powder-borax functional additive. A step-by-step mixing and two-stage sintering process is adopted in the preparation process, a covalent bond interface bridging structure is constructed through the coupling agent, the composite dispersing agent regulates and controls the multi-dimensional network distribution of the filler, and the process synergistically improves the compactness and the interface bonding force of the green body. The electrode paste is firm in interface bonding, can form a ceramic protective phase at a high temperature, has excellent conductivity and mechanical strength, and prolongs the service life of the electrode paste for the submerged arc furnace.

The invention provides a preparation method of a high-thermal-conductivity 99 aluminum oxide ceramic substrate, and belongs to the field of electronic ceramic materials. The method comprises the following steps: homogenizing and grinding a high-purity aluminum-containing compound and a modifier to obtain pretreated powder; mixing the pretreated powder with a carrier gas, and carrying out melt spheroidization to obtain a submicron spherical alumina precursor raw material; homogenizing and defoaming the submicron spherical aluminum oxide precursor raw material, an inorganic sintering aid, a dispersing agent, a binder, a plasticizer and a foam inhibitor in a solvent to obtain ceramic slurry; carrying out tape casting on the ceramic slurry to obtain an aluminum oxide green body; the alumina green body is subjected to rubber discharging, pre-sintering and sintering, and the 99 alumina ceramic substrate is obtained. The submicron spherical alumina powder is prepared through a melt spheroidizing process, the surface of the powder is smooth, particle size distribution is concentrated, grain boundary resistance between the powder is remarkably reduced, sintering densification is promoted, and therefore the technical problems that existing tape casting slurry is poor in stability and high in sintering temperature, and consequently microdefects are caused are solved.

The invention discloses an aluminum-based composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing powder of an intermediate alloy, a simple substance metal and a reinforcement with a binder, and carrying out cold pressing to form a green body; degreasing and sintering the green body to obtain a sintered part; and heating the sintered part, performing closed die forging, performing heat treatment and fine trimming to obtain a finished product, and if the performance does not meet the requirements, performing hot extrusion on the sintered part, and performing heat treatment and fine trimming to obtain the finished product. Oxide is removed through ball milling, the surface of the Al-Mg powder is activated, and passivation is protected through a binder; a reinforced phase SiC is designed to be blended with a binder, and then the mixture is mixed with other powder to form a specific microstructure; low-melting-point Sn is introduced to limit the sintering temperature, element diffusion is promoted through a liquid phase, and generation of a harmful intermediate phase is avoided; a sintered part with the density being 80-95% is adopted, a low-strain soft area is formed around a reinforced phase in cooperation with a specific microstructure, deformation coordination is improved, meanwhile, the peak aging time of the aluminum alloy is prolonged through SiC, the electric conduction and heat conduction performance is improved, and the comprehensive performance of the composite material is comprehensively improved.

The invention discloses a lightweight alumina foamed ceramic refractory material and a preparation method thereof, and relates to the technical field of ceramic materials. When the light aluminum oxide foamed ceramic refractory material is prepared, zirconium acetylacetonate, yttrium nitrate hexahydrate and aluminum nitrate nonahydrate are mixed to prepare a spinning solution for electrostatic spinning, nano aluminum titanate is loaded by using a nano spraying technology during spinning, and doped modified zirconium oxide fibers are prepared after high-temperature heat treatment and defibering and dispersing; mixing aluminum oxide micro powder, hollow aluminum oxide, a high-temperature foaming agent, doped modified zirconium oxide fibers and a sintering aid, and then performing ball milling and sieving to prepare aluminum oxide-based mixed powder; and carrying out mold pressing on the alumina-based mixed powder to prepare a green body, sintering, and cooling to prepare the lightweight alumina foamed ceramic refractory material. The light aluminum oxide foamed ceramic refractory material prepared by the invention has the advantages of light weight, low thermal conductivity, high compressive strength, high bending strength and good thermal shock resistance.

A method for manufacturing a lithium disilicate glass ceramic with gradient properties by using photocuring additive manufacturing, the method comprising: performing wet mixing on a basic glass powder with a solvent, ball milling same until uniformity, drying same, then performing thermal treatment to reach a molten state, then quenching same to form original particles, and then granulating same to obtain lithium disilicate ceramic particles; respectively preparing n groups of pastes with gradually-changing colors and translucencies from n groups of the lithium disilicate ceramic particles, said paste preparation comprising: adding 3Y-TZP powder, a coloring agent and lithium disilicate ceramic particles to a resin mixture, mixing same, rolling same and performing vacuum defoaming to obtain a paste; adding the n groups of pastes in sequence into an additive manufacturing device to undergo photocuring forming, so as to obtain a green body; after the green body is cleaned and dried, degreasing the green body, and sintering same; and finally under a vacuum high-temperature condition, subjecting the sintered sample to an ion exchange reaction with a molten nitrate in a flowing state, so as to obtain a product.

A method for preparing a high-coercivity and high-thickness NdFeB magnet belongs to the technical field of rare earth permanent magnet material preparation and solves the technical problem of preparing high-thickness and high-coercivity NdFeB magnets. The method comprises the following steps: first, sequentially subjecting the NdFeB magnets to rapid solidification strip spinning, hydrogen crushing, airflow milling, magnetic field orientation molding, cold isostatic pressing, and vacuum low-temperature sintering to obtain a thin low-temperature sintered green body; second, subjecting the low-temperature sintered green body to a grain boundary thermal diffusion treatment after preparing a heavy rare earth element layer on the surface of the low-temperature sintered green body; third, subjecting the low-temperature sintered green body after the diffusion heat treatment to mechanical coarse crushing, hydrogen crushing, powder mixing, airflow milling, magnetic field orientation molding, and cold isostatic pressing to obtain a thick, high-thickness compact; finally, subjecting the high-thickness compact to vacuum low-temperature heat treatment, vacuum high-temperature sintering, and two heat treatments to obtain a high-coercivity and high-thickness NdFeB magnet. The method has a simple preparation process, significantly improves the coercivity of bulk NdFeB sintered magnets, and enables the magnets to have a high magnetic energy product.

The invention relates to the technical field of porcelain production, and discloses a fettling device for ceramic production, which comprises a base, a rotating table is rotatably arranged on the base, and the rotating table is used for placing a green body; a fettling mechanism, a first transmission mechanism and a driving mechanism are further arranged on the base, the fettling mechanism comprises a first sliding seat and a turning tool, and the turning tool is elastically connected with the first sliding seat through a spring damper; the driving mechanism comprises a rotating seat rotationally arranged in the base, and a rotating disc is arranged on the rotating seat and connected with the rotating table. According to the fettling device for ceramic production, a mechanical device is adopted for automatic fettling, the production efficiency is improved, the position and angle of a turning tool can be freely adjusted to replace manual holding of the turning tool, the stability of rotary cutting fettling is improved, the position of the turning tool can be automatically adjusted along with the thickness change of a contacted green body, and the rotating speed of the rotating table can also be automatically adjusted; the method of rough trimming and then fine trimming during manual fettling is simulated, and the situation that a blank is damaged due to the fact that initial rotary cutting force is too large is avoided.

The invention discloses self-cleaning antibacterial domestic ceramic and glaze and a preparation process thereof. The preparation process comprises the following steps: step 1, early-stage research and innovative conception; 2, determining a core raw material and a formula; step 3, pretreating the raw materials; step 4, glaze preparation process; step 5, preparing a domestic ceramic green body; step 6, glazing and sintering process; the preparation method has the advantages that nano titanium dioxide added in the glaze can generate free radicals with strong oxidizing property under illumination, organic pollutants on the surface of ceramic can be decomposed, the self-cleaning function is achieved, meanwhile, nano silver and silver-loaded zirconium phosphate have good antibacterial performance, breeding of various bacteria can be effectively inhibited, the anti-bacterial performance is good, the service life of the glaze is prolonged, and the service life of the glaze is prolonged. The antibacterial rate on common bacteria such as escherichia coli and staphylococcus aureus can reach 95% or above, the raw materials are wide in source and meet the environment-friendly requirement, the conventional ball milling, forming, glazing and firing processes are adopted, industrial production is easy, the cost is low, and large-scale popularization of the product is facilitated.