1023 results about "Mullite" patented technology

The invention relates to the technical field of ceramic clay, in particular to wear-resistant ceramic clay and a preparation method thereof.The wear-resistant ceramic clay is prepared from, by weight, 35-40 parts of kieselguhr, 15-20 parts of silicon carbide, 8-12 parts of modifier based on mullite modification, 5-8 parts of modified cordierite agent, 4-7 parts of aluminum oxide, 4-7 parts of calcined talc, 3-5 parts of potassium feldspar and 30-35 parts of water. According to the wear-resistant ceramic clay disclosed by the invention, the diatomite and the silicon carbide are matched with the aluminum oxide, the calcined talc and the potassium feldspar, and the modifier based on mullite modification and the modified cordierite agent are added, so that the wear resistance, the stain resistance and the heat-conducting property of the obtained ceramic clay are coordinated and improved through co-blending and matching of the raw materials and mutual enhancement and improvement of the raw materials; meanwhile, the product is remarkable in anti-damage stability effect.

The invention discloses a reaction-sintered silicon carbide setter plate and a preparation method thereof. The reaction-sintered silicon carbide setter plate product is obtained through powder granulation, compaction and reaction sintering. Wherein the silicon carbide powder of the four particle size sections is matched, the particle size sections are uniform, stacking is more reasonable, coarse particles form a frame, fine particles are filled among the coarse particles, the powder structure is compact in property, and the compactness of a green body obtained after blank pressing is guaranteed; and spray granulation is performed after ball milling, so that all the raw materials and auxiliary materials are uniformly mixed. The surface of the green body pressed by a set oil pressure mold is also provided with a concave-convex structure, so that the contact area between the load bearing plate and the bottom of the domestic porcelain is reduced, air circulation between the load bearing plate and the bottom of the domestic porcelain is increased, and adhesion is effectively avoided. The product has the advantages of long service life, high strength and fast heat conduction, solves the problems of low strength, low heat conductivity and short service life of mullite, and also solves the industrial pain point of adhesion of a reaction-sintered silicon carbide setter plate.

The invention relates to the technical field of ceramics, in particular to anti-fouling ceramic glaze water, anti-fouling ceramic and a preparation method of the anti-fouling ceramic glaze water, and the anti-fouling ceramic glaze water comprises the following raw materials in parts by weight: 10-15 parts of quartz, 5-10 parts of calcite, 5-8 parts of a silicon nitride-doped adhesion increasing agent, 4-7 parts of zinc oxide, 4-7 parts of spodumene and 4-7 parts of a modification regulator. According to the anti-fouling ceramic, the calcined talc, the potassium feldspar, the kaolin, the mullite and the water are subjected to blending and ball milling treatment, wet ball milling improvement is performed, the raw materials are blended and coordinated, a ceramic body is prepared through shaping treatment, meanwhile, anti-fouling ceramic glaze water is adopted for glazing, the silicon nitride-doped connecting agent and the modification regulator are added, and the silicon nitride-doped connecting agent and the modification regulator are matched and have a synergistic effect, so that the anti-fouling ceramic is prepared. The mechanical strength, the pollution resistance and the wear resistance of the obtained product are improved in a balanced manner, and meanwhile, the freezing resistance and the corrosion-resistant stability effect of the product are remarkable.

The invention discloses an alumina fiber reinforced mullite ceramic-based composite material with volume concentration gradient distribution, which is composed of continuous alumina fiber cloth and a mullite ceramic matrix, the continuous alumina fiber cloth and the mullite ceramic matrix are in volume concentration gradient distribution, the volume density of the alumina fiber at the center is 50-60%, and the volume density of the alumina fiber at the center is 50-60%. The volume density of the mullite ceramic is 10-20%, the volume densities of the alumina fiber and the mullite ceramic are gradually increased from the center to the outside, the volume density of the surface alumina fiber is 70-80%, the volume density of the mullite ceramic is 20-30%, and the surface alumina fiber and the mullite ceramic form a compact structure which can block air conduction. The heat insulation performance of the alumina fiber reinforced mullite ceramic-based composite material is remarkably improved, and the high-strength characteristic is achieved while the light weight is achieved.

The invention discloses a low-carbon magnesia-carbon refractory material for clean steel smelting and a preparation method thereof, and relates to the technical field of magnesia-carbon refractory materials. The low-carbon magnesia-carbon refractory material comprises the following components: 40-50 wt% of fused magnesite with the particle size of 3-5 mm, 20-30 wt% of fused magnesite with the particle size of 1-3 mm, 10-20 wt% of fused magnesite with the particle size of less than or equal to 74 [mu] m, 8-12 wt% of silicon powder, 1-3 wt% of alumina powder and 3-5 wt% of crystalline flake graphite. 2-4 wt% of a composite additive and 4-6 wt% of phenolic resin are added; the composite additive comprises andalusite and mullite. The material has excellent mechanical properties, thermal shock resistance, oxidation resistance and erosion resistance; the preparation method has the characteristics of low cost and simple process, and the prepared low-carbon magnesia carbon refractory material has excellent oxidation resistance, thermal shock resistance and slag resistance by exerting the phase volume expansion effect and intergranular phase enhancement effect of the multiphase ceramic; the used graphite is low in content, graphite consumption and molten steel recarburization risk can be reduced, and the method is suitable for smelting clean steel.

According to the mullite castable preparation method based on comprehensive utilization of the secondary aluminum ash nonferrous smelting slag, components are regulated and controlled by controlling the molar ratio of Al2O3 to SiO2, so that porous light mullite stably falls into a mullite phase region, and generation of excessive corundum phases is avoided. PMMA microspheres, corn flour, carbonized rice husks and SiO2 coated calcium carbonate composite pore-forming agent systems are adopted, and a layered slurry formula, gradient slip casting and segmented sintering processes are combined, so that the porosity and strength distribution are accurately regulated and controlled, and low-temperature sintering and amorphous phase change control are realized. By optimizing the grading of the porous light mullite aggregate and adding the homologous fine powder, the bonding strength and compressive strength of the castable are improved. And finally, the surface of the castable is coated with a compact mullite coating, so that the porosity is reduced, and the erosion resistance, corrosion resistance and stripping resistance are remarkably improved. The obtained castable has the advantages of light weight, high temperature resistance, high strength, low cost and excellent thermal stability and erosion resistance.

The invention provides an anti-corrosion ceramic sagger and a preparation method thereof.The anti-corrosion ceramic sagger comprises an aggregate layer and a matrix layer, and the aggregate layer is prepared from, by mass, 30-50 parts of yttrium-stabilized zirconia, 20-30 parts of silicon carbide and 15-25 parts of magnesium aluminate spinel; the matrix layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of mullite micro powder, 30 to 40 parts of cordierite micro powder and 10 to 20 parts of binding agent. According to the anti-corrosion ceramic sagger and the preparation method thereof, by optimizing the raw material ratio and the preparation process, the corrosion depth is smaller than or equal to 0.19 mm after the sagger is soaked in the molten salt environment at 900 DEG C for 72 h, the service life is prolonged by 6-8 times compared with that of a traditional corundum sagger, and the anti-corrosion ceramic sagger has wide application prospects.

The invention discloses a carbon ceramic composite conductive microsphere, a ceramic resistor and a preparation method, and belongs to the technical field of production of special materials of electrical equipment, and the method comprises the following steps: sequentially dipping porous mullite in a precursor solution of carbon and slurry containing carbon black, and carrying out drying treatment and carbon burying sintering to obtain the carbon ceramic composite conductive microsphere; the preparation method comprises the following steps: preparing a ceramic raw material, performing vacuum-assisted centrifugal impregnation on the ceramic raw material and slurry consisting of a binder in pug consisting of the ceramic raw material and a surfactant, sequentially performing drying and glue discharging treatment, primary isostatic pressing forming and air pressure sintering, cooling to room temperature, and performing mechanical treatment and electrode spraying to obtain the ceramic resistor. Impregnation improves the dispersibility and uniformity of the carbon material in the porous mullite to form a continuous conductive path, the carbon black-containing slurry improves the conductivity of the ceramic resistor, carbon-buried sintering generates in-situ carbon with abundant types, the combination of carbon and a ceramic interface is promoted, and the oxidation resistance, mechanical properties and electrical properties of the ceramic resistor are improved.

The invention relates to the technical field of insulators, and provides a high-strength insulator and a preparation method thereof.The high-strength insulator is prepared from, by weight, 20-30 parts of aluminum oxide, 10-15 parts of kaolin, 6-10 parts of aluminum nitride, 15-20 parts of mullite, 5-10 parts of mica powder, 3-6 parts of titanium dioxide and 10-15 parts of modified silicon nitride whiskers; the modified silicon nitride whiskers are obtained by modifying silicon nitride whiskers with rare earth oxide. According to the technical scheme, the problem of low insulator strength in the prior art is solved.

The invention discloses a wear-resistant and mildew-proof ceramic tile which comprises a green body and a glaze layer attached to the green body, and the wear-resistant and mildew-proof ceramic tile is obtained by coating the surface of the green body with a modified interface agent and then glazing, wherein the glaze layer is prepared from the following raw materials in parts by weight: 40 to 50 parts of silicon dioxide, 30 to 35 parts of aluminum oxide, 15 to 20 parts of modified titanium dioxide, 6 to 10 parts of barium carbonate, 6 to 10 parts of mullite, 5 to 8 parts of silver-loaded zirconium phosphate, 4 to 8 parts of potassium carbonate, 4 to 8 parts of sodium carbonate, 3 to 7 parts of limestone, 3 to 5 parts of sodium borate, 2 to 4 parts of zinc oxide and 0.5 to 1 part of sodium tripolyphosphate. According to the ceramic tile, the modified interface agent with specific composition is introduced between the ceramic tile green body and the glaze layer, modified titanium dioxide and inorganic components (such as aluminum phosphate, aluminum acetylacetonate and tetrapropyl zirconate) in the interface agent form oxides in the sintering process, and the interface bonding strength is remarkably enhanced through physical occlusion; and the long-term wear resistance and mildew resistance of the ceramic tile glaze layer are improved.

The invention discloses a preparation method of a mullite ceramic fiber with a hollow hierarchical structure, and belongs to the technical field of ceramic fiber material preparation. The preparation method comprises the following steps: firstly, preparing hollow mullite fibers by utilizing coaxial electrostatic spinning, and then growing a hierarchical structure of mullite whiskers on the hollow mullite fibers. The preparation method of the hierarchical structure comprises the following steps: by taking hollow mullite fibers as a matrix, carrying out vacuum impregnation with an aluminum-silicon nano powder solution, then carrying out vacuum impregnation with a fluoride solution, and calcining to obtain the hollow hierarchical mullite ceramic fibers. The preparation method of the porous mullite fiber is simple, the pore structure is easy to control, and the heat insulation performance is excellent. The mullite graded fiber prepared by the method has excellent high-temperature resistance and light weight, can be used for preparing a high-temperature-resistant heat insulation piece, and can provide a novel light high-temperature-resistant heat insulation material for the fields of spaceflight and military industry and the like.

The invention belongs to the technical field of motor casing lost foam casting, and particularly relates to a special coating for a motor casing lost foam as well as a preparation method and application thereof. Through a quantitative formula design method, an aggregate proportion calculation formula based on thermal expansion coefficient matching and a grain size distribution correlation formula based on target air permeability, cooperative compounding of quartz powder and bauxite is achieved, and key functional components such as mullite, organic matter fibers and crystalline flake graphite are combined; the unification of high air permeability and excellent crack resistance of the motor shell lost foam coating is realized. The invention further provides a two-time coating gradient drying efficient process matched with the coating, and on the premise that the coating performance is guaranteed, the production efficiency is remarkably improved, and the energy consumption is reduced.

The invention belongs to the technical field of resource recycling, and discloses lead-zinc tailing ceramsite and a preparation method thereof. The lead-zinc tailing ceramsite is mainly prepared from the following raw materials in parts by mass: 100 parts of lead-zinc tailings; 20 to 30 parts of limestone tailings; 6-8 parts of active mullite nano powder; 1-3 parts of glass micro powder; and 8-12 parts of dry sludge powder. The invention also provides a preparation method of the lead-zinc tailing ceramsite. The lead-zinc tailings are used as main raw materials to prepare the lead-zinc tailings ceramsite, through compounding of the lead-zinc tailings and the limestone tailings, the synergistic effect of the lead-zinc tailings and the limestone tailings is achieved, resource utilization of the lead-zinc tailings and the limestone tailings is achieved, and good economic benefits and social benefits are achieved. The density grade of the ceramsite prepared by the invention is 600-900, the cylinder compressive strength is 6.8-9.8 MPa, the water absorption rate is 9.4-11.4%, and the ceramsite has relatively good strength and relatively low water absorption rate.

The invention relates to the technical field of silicon mullite bricks, in particular to a method for preparing a low-thermal-conductivity silicon mullite brick by utilizing basalt fibers and ceramic powder. Comprising the following steps of S1, raw material preparation, S2, functional layer preparation, S3, thermal insulation layer preparation and S4, compression molding. The corrosion resistance and the thermal insulation performance of the low-thermal-conductivity silicon mullite brick are further optimized and improved through the synergistic effect of the basalt fibers and the ceramic powder, and the problem that the performance of a composite material is affected due to the fact that the basalt fibers are prone to being pulled out when stressed is solved. By adopting the ceramic powder with the core-shell structure, the mechanical property of the basalt fiber composite material can be remarkably improved, and the salt and alkali resistance and the heat preservation effect of the brick are optimized while the mechanical property of the low-heat-conductivity silicon mullite brick is further improved.

The invention relates to a chromium-zirconium-corundum refractory material, a preparation method thereof and a chromium-zirconium-corundum brick. The chromium zirconium corundum refractory material comprises the following raw materials in parts by mass: synthetic chromium corundum powder, fused zirconium mullite powder, first chromium oxide powder, first alumina powder and a first binding agent; the synthetic chromium corundum powder comprises the following raw materials in parts by mass: second chromium oxide powder, second aluminum oxide powder and a second binding agent; the synthetic chrome corundum powder comprises first synthetic chrome corundum powder, second synthetic chrome corundum powder, third synthetic chrome corundum powder and fourth synthetic chrome corundum powder; the electric smelting zirconium mullite powder comprises first electric smelting zirconium mullite powder and second electric smelting zirconium mullite powder; the mass fraction of Cr2O3 in the chromium zirconium corundum refractory material is 30%-35%. The chromium zirconium corundum refractory material provided by the invention has the advantages of high porosity, high high-temperature structural strength, low high-temperature creep rate, strong chemical erosion resistance and good thermal shock resistance.

The utility model discloses an intelligent energy-saving heat treatment kiln, which relates to the technical field of kiln equipment and comprises a base, a kiln body is arranged at the top of the base, a movable plate is arranged in the kiln body, a sliding rail is arranged between the movable plate and the base, and a driving structure is arranged on one side of the sliding rail. The kiln body can have good heat insulation performance through the heat insulation layer made of the heat insulation cotton, the heat insulation cotton does not contain any binding agent and is good in environment-friendly performance, meanwhile, the heat resistance and the heat insulation performance of the whole kiln body can be achieved through the heat insulation area made of mullite materials and the light clay heat insulation bricks in the grooves, and secondly, the heat insulation performance of the whole kiln body is improved. According to the intelligent energy-saving heat treatment kiln, the technical problems that the temperature of the surface of a shell is high due to the fact that a water inlet and a water outlet are matched with each other, the working stability and the service life of external equipment and matched components of a kiln body are affected adversely, and meanwhile energy consumption is caused are solved, and the practicability of the whole intelligent energy-saving heat treatment kiln is improved.

The present application relates to the technical field of thin ceramic tile production, and specifically discloses a low-temperature sintered thin ceramic tile and a production method. The thin ceramic tile is mainly made of the following raw materials in parts by weight: 15-25 parts of pyrophyllite, 10-20 parts of potassium feldspar, 10-20 parts of sodium feldspar, 10-20 parts of mullite, 20-30 parts of quartz sand, 6-10 parts of micron metal oxide, 4-6 parts of flake graphite, 4-6 parts of aluminum borate whiskers, 6-8 parts of aluminum oxide fiber, 2-4 parts of metal aluminum powder, 1-3 parts of flux, 3-7 parts of ball clay, 8-12 parts of bentonite, and 13-17 parts of silica sol adhesive. The thin ceramic tile, through the mutual cooperation between the raw materials, can not only achieve low-temperature sintering, but also has the advantages of high breaking strength, high modulus of rupture, and low water absorption, improves the quality of thin ceramic tiles, expands the scope of application, increases the stability of use, prolongs the service life, and meets market demand.

The invention relates to a silicon-based ceramic, a preparation method and application thereof, and a removal method of a ceramic core for titanium alloy casting, the raw materials of the silicon-based ceramic comprise solid powder and a binder, the solid powder comprises 60-100 wt% of silicon dioxide, 0-10 wt% of mullite, 0-10 wt% of kaolin and 0-20 wt% of yttrium oxide; the mass ratio of the solid powder to the binder is 1: (0.01-0.05); the contents of mullite, kaolin and yttrium oxide are all greater than 0; the silicon-based ceramic provided by the invention has excellent room high temperature mechanical properties and good dissolution performance.

The present invention relates to the technical field of refractory materials, and specifically discloses a lightweight and high-strength refractory ceramic material and a preparation method thereof, comprising 30%-40% lightweight filler (expanded perlite or glass microspheres), 20%-30% corundum or mullite, 10%-15% silicon carbide, 10%-20% high bauxite and 1%-5% dispersant, an oven is used to dry the lightweight filler, a ball mill is used to crush the corundum or mullite and silicon carbide, and a vibrating screen is used to screen them. The present invention ensures that the final ceramic material has the advantages of light weight, high strength, good thermal shock resistance, excellent thermal insulation, high temperature resistance, corrosion resistance, etc., is suitable for structural materials or thermal insulation materials in high temperature environments, and the precise control of humidity, temperature and molding pressure during the preparation process improves the uniformity and performance stability of the material, ensuring an efficient production process.

The invention belongs to the technical field of ceramic materials, and particularly relates to a high-strength building ceramic material and a preparation method thereof. The high-strength building ceramic material is prepared from the following raw materials in parts by weight: 20 to 30 parts of potassium feldspar, 15 to 23 parts of kaolin, 37 to 45 parts of solid waste-based silicon carbide, 1 to 4 parts of talc, 3 to 8 parts of modified mullite whisker and 2 to 5 parts of filler, a preparation process of the modified mullite crystal whiskers comprises the following steps: (1) adding mullite crystal whiskers into an ethanol water solution containing a silane coupling agent, and heating for reaction to obtain pretreated mullite crystal whiskers; and (2) adding the mullite whiskers pretreated in the step (1) into a nickel sulfate aqueous solution, then adding triethylamine and sodium thiosulfate, and carrying out a heating reaction to obtain the modified mullite whiskers. After the raw material components are combined, preparation of a high-strength ceramic material is facilitated, the heat conductivity coefficient can be increased, the heat conduction effect can be enhanced, and the ceramic material is suitable for common home decoration and high-heat-conductivity floor heating ceramic tiles.

The invention relates to the technical field of domestic ceramics, in particular to a high-strength and high-gloss domestic ceramic and a preparation method thereof, and the high-strength and high-gloss domestic ceramic comprises the following raw materials in parts by weight: 35-45 parts of mullite, 15-20 parts of spodumene, 10-15 parts of quartz, 8-12 parts of a modifier doped with barium carbonate, 5-8 parts of a boric oxide additive and 7-11 parts of a yttrium-zinc reconditioning agent. According to the domestic ceramic, mullite, spodumene and quartz are used as matrixes, an added yttrium-zinc compound regulator is used as an antibacterial functional agent, nano-zinc oxide is blended into cobalt nitrate and yttrium nitrate solutions, sintering improvement is performed, and the antibacterial stability of the product is enhanced and optimized through compounding of yttrium, zinc and cobalt; meanwhile, the added modifier doped with barium carbonate and the boron oxide additive are mutually blended and coordinated, so that the antibacterial property, the glossiness and the strength of the obtained domestic ceramic are improved in a balanced and coordinated manner, and the product is remarkable in cold and heat resistance and temperature-resistant stability effect.

The invention belongs to the field of advanced structure ceramic preparation, and particularly relates to a load-bearing type high-temperature bedplate and a manufacturing method thereof. The preparation method of the load-bearing type high-temperature bedplate comprises the following steps: (1) sequentially paving the outer layer material, the inner layer material and the outer layer material into a mold, and carrying out high-pressure forming to obtain a formed blank; (2) drying the formed blank to obtain a dry blank; and (3) firing the dry blank at the temperature of 1550-1680 DEG C to obtain the bedplate. The preparation method comprises the following steps: by taking low-zirconium corundum, white corundum, fused mullite and andalusite as raw materials, introducing zirconite and tabular corundum fine powder, and respectively preparing an outer layer material and an inner layer material; the high-strength wear-resistant bedplate with a low-zirconia corundum outer layer and a staggered structure in which zirconia corundum crystals are filled in gaps of a mullite network is formed through pressure forming and sintering, has good high-temperature strength and excellent thermal shock resistance, can bear constantly changing impact of high-low temperature circulation of a pushed slab kiln, and has long service life.

The invention relates to the field of refractory castable, in particular to mullite-based modified high-strength refractory castable and a preparation process thereof. The refractory castable is used for solving the problems of low strength and poor wear resistance of the existing refractory castable. The niobium-zirconium alloy and the benzoxazine-PAMAM copolymer are added into the refractory castable, the benzoxazine-PAMAM copolymer wraps a matrix in a three-dimensional network structure, so that the cohesive force is improved, a carbon layer is formed among matrix particles after sintering to improve the overall compactness of the material, micropores in the matrix of the refractory castable can be filled with the niobium-zirconium alloy, the porosity is reduced, and the porosity of the refractory castable is improved. The refractory castable disclosed by the invention can be used for reducing stress concentration, remarkably improving normal-temperature compression resistance and breaking strength, maintaining long-term high-temperature strength and ensuring that the refractory castable can still be kept stable in severe environments such as high temperature, high pressure and corrosion, so that the service life is prolonged, and the production safety is improved.

The invention discloses a preparation method of a columnar mullite-reinforced silicon carbide composite ceramic membrane support and a product prepared by the preparation method, silicon carbide powder and aluminum oxide are used as main raw materials, and a sintering aid and a pore forming agent are combined to obtain the silicon carbide composite ceramic membrane support in which columnar mullite crystals are generated in situ at the necks of silicon carbide particles. The preparation method is simple and low in cost, the silicon carbide ceramic membrane support with high porosity, good mechanical strength and water flux and excellent corrosion resistance can be prepared through normal-temperature and normal-pressure sintering, and application and development of a ceramic membrane separation technology are promoted.

The invention discloses a corundum high-strength wear-resistant castable, which belongs to the field of castable, and comprises a raw material, an auxiliary material, a binding agent and an additive, the raw material is corundum aggregate, and the auxiliary material comprises corundum fine powder, mullite fine powder, an inorganic non-metallic material and stainless steel fiber, the binding agent comprises calcium aluminate cement, hydrated alumina, silica sol, aluminum dihydrogen phosphate and refractory clay, and the additives comprise sintered spinel fine powder, silica micropowder, activated alumina micropowder, zirconia micropowder, a coagulant, a retarder, a dispersant, a flocculant, a plasticizer, a water-retaining agent, an anti-settling agent and a preservative. The corundum high-strength wear-resistant castable is prepared by mixing the raw materials, the auxiliary materials, the binding agent and the additive, so that the corundum high-strength wear-resistant castable has excellent strength, wear resistance, fire resistance and thermal shock resistance during use, and further the actual use effect and performance of the corundum high-strength wear-resistant castable are ensured; and the service life of the product is prolonged.

The invention discloses a method for preparing a mullite-based porous ceramic material from biochar and coal co-gasification fly ash, and belongs to the technical field of porous ceramic materials. Aiming at the technical bottlenecks of single raw material, dependence of a pore-forming mode on an additional material, poor controllability of a pore channel structure, low resource utilization efficiency of industrial byproducts and the like in the preparation of the existing mullite-based porous ceramic, the invention provides the preparation method of the mullite-based porous ceramic. The preparation method comprises the following steps: by taking charcoal and coal co-gasification fly ash as a silicon source and an additional aluminum source as a mixed raw material, proportioning according to a specific mass ratio of aluminum oxide to silicon oxide, adding a binder and a pore-forming agent, and uniformly mixing to obtain a mixture; and adding a whisker accelerant, granulating, sieving, carrying out static-pressure blank forming, drying and sintering to obtain the mullite-based porous ceramic material. The preparation method has a new path for preparing the mullite-based porous ceramic with remarkable resource value and industrialization potential, and provides technical support for promoting high-value utilization of multi-source solid wastes and development of functional ceramics.

The invention relates to the technical field of ceramic powder metallurgy, and discloses raw materials for in-situ generation of a core-shell structure ceramic core and a preparation method.The raw materials of the ceramic core comprise refractory material powder, zirconium silicate powder, fused corundum powder and nanometer aluminum oxide powder; the preparation method comprises the following steps: mixing refractory material powder, zirconium silicate powder, fused corundum powder and nano alumina powder in percentage by weight to form a ceramic core raw material, adding the ceramic core raw material into liquid paraffin to form ceramic core slurry, and obtaining a ceramic core biscuit by utilizing the ceramic core slurry through a hot-pressing injection molding method; and the ceramic core biscuit is subjected to powder burying sintering to obtain the ceramic core. Through the synergistic effect of the nanometer aluminum oxide powder, the fused corundum powder and the silicon oxide powder, a core-shell structure with aluminum oxide as a core and mullite fibers as a shell is generated in situ in the sintering process, the bonding strength of the fibers and raw material particles is enhanced, the effective retarding effect on cracks when the ceramic mold core is stressed is achieved, and the ceramic mold core has the good anti-cracking effect. The performance of the ceramic core is further enhanced.

The invention relates to the technical field of environment-friendly material preparation and water treatment, and particularly discloses a recycling method for producing a porous water treatment filler by using sludge and red mud. The raw material formula is optimized, and the red mud, the sludge, the tourmaline powder, the medical stone powder and other components are selected to jointly form the base material. The filler prepared according to the method provided by the invention not only realizes recycling of solid wastes such as sludge and red mud, but also has an ideal pore structure, can be in full contact with sewage, and is beneficial to improving the sewage treatment efficiency. Meanwhile, mullite, aluminum borate, tridymite and part of minerals in the red mud and clay materials are utilized to jointly form a framework structure of the filler, the mechanical performance of the filler is improved, the filler is not prone to damage in the using process, and the defects in related technologies are overcome.

The invention relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a special coating for a large machine tool casting lost foam as well as application and a use method of the special coating. According to the invention, the full-temperature-range functional composite material and the composite aggregate are used for synergistic reinforcement, and mullite is used for high-temperature reinforcement; the temperature-sensitive polymer modified graphite can realize intelligent temperature response of graphite performance; spodumene is used as a thermal expansion adaptive fluxing agent, so that medium-temperature healing and thermal expansion adjustment of a coating system are facilitated; the composite reinforced fibers are reinforced and toughened aiming at large thermal stress of thick and large parts; as an ultralow-temperature glazing agent, the boron-containing glazing agent can form an initial liquid phase at about 450 DEG C to seal the surface of the coating and purify a ventilation channel; the rare earth oxide serving as a high-temperature phase stabilizer can be dissolved in mullite crystal lattices, so that the high-temperature phase stability is improved, and ceramic nodes are refined. Through raw material design, on the premise of ensuring moderate air permeability, the ultrahigh strength and crack resistance of a coating system at extremely high temperature are improved.

The invention relates to the technical field of lost foam casting, in particular to a lost foam composite coating, the lost foam composite coating takes a refractory material of an investment casting regenerated shell membrane as a refractory aggregate, the refractory aggregate comprises mullite and a mixture containing an inorganic preservative A and a sintering stripping material B, and one or more of quartz powder and graphite are selected. In the invention, an efficient anti-corrosion additive with sintering stripping is researched and developed as a refractory material auxiliary additive, and meanwhile, low-price refractory materials such as regenerated mullite and recycled quartz powder are utilized to form the lost foam coating aggregate, so that the selection of traditional refractory aggregate is broken through, and the reutilization of waste resources is realized; the environment pollution is reduced while the raw material cost is reduced, meanwhile, the aggregate performance is optimized by adding the raw materials such as calcium oxide and iron oxide red, and the comprehensive performance such as air permeability, suspension stability, high-temperature strength and toughness of the coating is remarkably improved through reasonable matching of the composite binder.