515 results about "Mullite" patented technology

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 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 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 sand mold casting, and particularly discloses a gradient exhaust sand mold for an aluminum alloy thin-walled workpiece and a preparation method thereof.The sand mold comprises a cavity surface layer (with the hardness ranging from 90 HB to 95 HB), a transition layer (with the hardness ranging from 80 HB to 70 HB and a back sand layer (with the hardness ranging from 60 HB to 65 HB) which are arranged from inside to outside, and microporous ceramic exhaust rods (with the diameter ranging from 0.3 mm to 0.8 mm and the distance ranging from 1 mm to 3 mm) are embedded in the cavity surface layer; the exhaust rod is composed of a mullite fiber matrix and a nanometer gamma-AlO coating, the porosity is 40-50%, and the exhaust rod penetrates through the back sand layer to form a directional exhaust network. The preparation method comprises the following steps: mixing sand layer by layer (the cavity layer contains 1.0-1.5% of phenolic resin, and the back sand layer contains 0.4-0.6% of resin and 4-6% of starch); when sand is filled to the position 1-3 mm away from the surface of the cavity, an exhaust rod is implanted (the positioning precision is + / -0.1 mm); gradient compaction is carried out (the high pressure of a cavity is 3.0-4.0 MPa, the vibration of a transition area is 20-30 Hz, and the back sand airflow is 0.1-0.2 MPa); and carrying out microwave curing (2.5 to 3.5 kW, 60 to 120 s). The defects of hot cracks and air holes of the thin-wall part (smaller than or equal to 5 mm) are overcome synchronously, and the casting yield is increased to 95% or above.

The invention belongs to the technical field of fly ash solid waste resource utilization, and particularly relates to a method for preparing flaky alumina by using fly ash, which is characterized by comprising the steps of fly ash pretreatment, intermediate preparation and alumina preparation, ammonium fluoride used in the alumina preparation step is a recycling product of fluorine-containing tail gas in the step, and ammonium fluoride used in the alumina preparation step is a recycling product of fluorine-containing tail gas in the step. The preparation method comprises the following specific operation steps: 1) pretreating fly ash, namely treating fly ash with a NaOH solution and an HCl solution to obtain a mixture of quartz and mullite; (2) preparing an intermediate, namely reacting a mixture of quartz and mullite with CeO2 to obtain a K3Al (SO4) 3 intermediate; and 3) preparing aluminum oxide, purifying the K3Al (SO4) 3 intermediate, grinding and mixing the purified K3Al (SO4) 3 intermediate and ammonium fluoride crystals according to the F / Al molar ratio, and roasting at high temperature to obtain a flaky aluminum oxide product. The method has the beneficial effects that the problem of low purity of flaky aluminum oxide in the existing method for preparing the aluminum oxide from the fly ash is solved, and the purity of the flaky aluminum oxide is 99.2-99.8%.

The invention discloses a fracturing proppant using coal gangue and fly ash and a preparation process thereof, and relates to the field of fracturing proppants, the fracturing proppant comprises coal gangue, fly ash, silica fume, nanometer alumina, a composite pore-forming agent and a fluxing agent, and the preparation process comprises raw material pretreatment, mixing granulation, microwave-gradient sintering and post-treatment. The raw material pretreatment comprises the following steps: removing iron and impurities through carbon thermal reduction-magnetic separation; the composite pore-forming agent is enriched on the surface of the green body during mixed granulation; the microwave-gradient sintering is used for cooperatively regulating and controlling growth of mullite crystals through microwave preheating and resistance heating to form an internal acicular mullite interlaced structure and a surface micro-convex structure; a finished product is obtained through post-treatment grading and surface cleaning. Resource utilization of industrial solid waste is achieved, the strength and flow conductivity of the proppant are improved through raw material synergy, crystal structure regulation and control and surface microstructure design, preparation energy consumption is reduced, and the proppant is suitable for oil and gas field fracturing engineering.

The invention discloses a silicon mullite brick with high connection stability and a production process thereof, and belongs to the technical field of silicon mullite brick preparation. Through the composite formula design of the multi-graded silicon carbide aggregate and the in-situ generated mullite precursor and in combination with a microwave-air pressure coupling sintering process, the optimization of the material structure is realized. Wherein the silicon carbide aggregate is subjected to surface etching to form a microporous structure, and the microporous structure and the aluminum phosphate nanofiber reinforced matrix form a three-dimensional interlocking network; dual-band microwave alternate radiation and staged air pressure dynamic regulation and control are adopted, substance diffusion is promoted at low temperature, and meanwhile pore formation is inhibited at high temperature; and in the gradient cooling stage, the grain boundary stability is enhanced through controllable oxygen partial pressure and rare earth steam treatment. The process effectively improves the interface bonding strength and thermal shock resistance of the silicon mullite brick, reduces the sintering energy consumption, and is suitable for refractory material preparation of high-temperature equipment such as a cement kiln and an incinerator.

The preparation process comprises the following steps: uniformly mixing 80-90 parts by mass of fused mullite, 1-2 parts by mass of modified ZrSiO4 fine powder, 5-8 parts by mass of alpha-Al2O3 fine powder, 2-4 parts by mass of silicon powder, 3-5 parts by mass of aluminum powder and 3-5 parts by mass of mullite microsphere powder, adding 5-8 parts by mass of a binding agent, and uniformly mixing to obtain pug; the preparation process of the mullite microspheres comprises the following steps: mixing bauxite, feldspar and silica powder, adding water, grinding into slurry, carrying out spray drying, sintering, and rapidly cooling after sintering; the pug is sealed and stacked for 12-24 h and then subjected to high-pressure forming, and a blank is obtained; and gradually heating the blank to 120 DEG C, drying for 24-48 hours, and firing and molding. The ultralow-porosity anti-erosion brick is low in porosity and good in anti-erosion performance.

The invention belongs to the technical field of refractory materials, and particularly relates to a mullite refractory material with high mechanical property and a preparation method thereof. The mullite refractory material is prepared by taking coal gangue, bauxite and fly ash as raw materials, and the three industrial solid wastes are converted into the refractory material with high additional value, so that the concept of circular economy is met. According to the invention, coal gangue, bauxite and fly ash are used as raw materials, CaF2, V2O5 and lanthanide rare earth oxide are used as sintering aids, the problems of insufficient mechanical properties and overhigh sintering temperature of the mullite refractory material prepared by purely using coal gangue, bauxite and fly ash as raw materials are solved, and the performance of the mullite refractory material can be greatly improved. CaF2 and V2O5 promote substance transport and grain growth, and rare earth oxide inhibits excessive growth of grains. The balance of'promotion 'and'inhibition' is favorable for forming a compact, fine, uniform and interlaced mullite crystal network, and meanwhile, the mullite crystal network has high strength and good toughness.

The invention discloses a sintering method spherical mullite-zirconium oxide composite high-temperature kiln lining material, and belongs to the technical field of high-temperature-resistant materials. Mesoporous spherical mullite particles are used as a matrix, zirconium oxide hollow fibers are used as a reinforcing phase, the material is prepared by sintering, and the material belongs to an advanced inorganic non-metallic material, belongs to a fireproof and heat-insulating special brick and tile material, and is suitable for equipment such as energy-saving smelting furnaces and high-temperature kilns. The mesoporous spherical mullite particles are matched with the zirconium oxide hollow fibers, so that the apparent porosity of the material is greatly improved, and the volume density and the heat conductivity coefficient of the material are reduced; and the strength of the material is remarkably enhanced through the zirconium oxide hollow fibers.

The invention discloses a low-shrinkage porous mullite ceramic photocuring additive manufacturing method which comprises the following steps: firstly, mixing a base material containing aluminum and silicon elements with a villiaumite catalytic phase to prepare composite ceramic slurry, preparing a ceramic green body through a photocuring additive forming process, and then preparing the low-shrinkage porous mullite ceramic through a temperature-controlled thermal degreasing and in-situ gas phase method sintering process. The porous mullite ceramic with low shrinkage rate is prepared. By using the villiaumite catalytic phase material, the printability and stability of the ceramic slurry are maintained, the sintering temperature in the heat treatment stage is reduced, the low-size shrinkage performance is obtained, and large-scale efficient additive preparation of the porous mullite ceramic structural part is easy to realize.

The application discloses a kind of high wear-resistant hot bending forming rock plate, including following weight parts raw materials: kaolin 30-35 parts, fine ball clay 20-25 parts, wollastonite 10-15 parts, super white sand 10-15 parts, feldspar 8-14 parts, pyroxene 7-12 parts, talc 6-10 parts, bentonite 5-8 parts, tremolite 4-7 parts, sodium tripolyphosphate 3-5 parts, modified additive 4-7 parts.The high wear-resistant hot bending forming rock plate of the application uses kaolin, fine ball and other raw materials with modified additive, through the modification of mullite and cordierite in modified additive by specific modified liquid stirring, the silicon carbide whisker liquid in modified liquid cooperates with hydroxyapatite agent into the system, through the coordination and synergistic effect between raw materials, so that the performance of the product is further improved, the toughness performance, fracture performance and wear resistance of the product are improved in coordination.

The invention relates to the technical field of investment casting, in particular to an investment casting shell making method of an air inlet casing casting and a shell. The method comprises early-stage preparation (high-precision wax mold manufacturing and module assembling), a shell manufacturing process (shell manufacturing of a surface layer, a transition layer and a back layer) and subsequent procedures (dewaxing, roasting, pouring, cleaning and detecting). The surface layer and the transition layer are dried by silica sol-based paint (zircon powder / mullite powder) in cooperation with strong wind power, so that the surface quality and the initial strength are ensured; the back layer is hardened by adopting a water glass-based coating (coal gangue powder) matched with ammonium chloride, so that the supporting strength and air permeability of the main body are provided. By optimizing a composite shell-making material system and process parameters, the problem that in the prior art, the strength, the air permeability, the quality and the efficiency of a shell are difficult to consider at the same time is solved, and the method is particularly suitable for production of complex thin-wall castings such as aero-engine air inlet casings with extremely high requirements for the surface quality, the size precision and the internal structure; the defects of air holes, slag inclusion and the like can be effectively reduced.

The invention discloses a ceramic nanofiber membrane and preparation thereof, a catalytic ceramic nanofiber membrane and preparation and application thereof. The preparation method of the ceramic nanofiber membrane comprises the following steps: (1) cleaning a particle accumulation state ceramic membrane support body; (2) spraying the mullite fiber membrane layer slurry on one surface of a supporting body for multiple times by using a spraying method, after each spraying, applying negative pressure to a membrane for a preset time, then drying, and after the last drying, forming a spraying layer on one surface of the supporting body; and (3) sintering the obtained membrane at high temperature to obtain the ceramic nanofiber membrane which is provided with a support body and a mullite fiber membrane layer which is stably attached to one surface of the support body and is of a net-shaped structure formed by staggering and stacking mullite fibers. The catalytic ceramic nanofiber membrane comprises a ceramic nanofiber membrane and a catalyst loaded on the surface of the ceramic nanofiber membrane and in membrane holes. The ceramic nanofiber membrane provided by the invention has the advantages of high porosity, high mechanical strength, high membrane flux and the like, and is beneficial to subsequent catalyst loading and application in water treatment.

The invention belongs to the technical field of refractory materials, and particularly discloses a preparation method of an aerogel modified silicon mullite brick with high strength and low heat-conducting property. Comprising 5-15 parts of silicon carbide particles, 50-70 parts of bauxite A, 19-29 parts of bauxite B, 5-10 parts of bauxite fine powder, 1-2 parts of unmodified aerogel powder, 1 part of a solvent and 3-6 parts of alcohol. The preparation method comprises the following steps: 1, mechanically stirring and mixing silicon carbide particles, bauxite A, bauxite B, bauxite fine powder and a solvent to obtain a mixed raw material; 2, adding the aerogel powder into the mixed raw material, and continuously stirring and mixing to form aggregate; step 3, processing the aggregate through a brick press to obtain a green brick; and 4, placing the green brick in a tunnel kiln, carrying out gradient heating sintering, and discharging the green brick out of the kiln to obtain the aerogel modified silicon mullite brick. The refractory material has low heat conductivity, high strength and good fire resistance, and has remarkable economic benefits and environmental protection values.

The corundum-silicon carbide-mullite castable is prepared from sintered mullite particles, silicon carbide fine powder, activated aluminum oxide micro powder, silicon dioxide micro powder, composite rare earth oxide fine powder, aluminum titanate fine powder, a binding agent, a water reducing agent, explosion-proof fibers and porous composite corundum-silicon carbide particles. The porous composite corundum-silicon carbide particles are formed by sintering fused corundum particles and nano silicon carbide powder through in-situ reaction, micron-sized pore channels which are communicated with one another are formed in the porous composite corundum-silicon carbide particles, and the surfaces of the particles are coated with a compact mullite-corundum complex phase layer, so that thermal stress can be effectively buffered, and permeation of zinc and alkali vapor can be blocked; the low thermal expansion characteristic of aluminum titanate and the grain boundary purification effect of rare earth oxide are matched, thermal shock resistance and erosion resistance are synergistically improved, and excellent thermal shock resistance, chemical erosion resistance, high strength and wear resistance are shown under the harsh working condition of the zinc oxide rotary kiln.

The application relates to a bauxite-based corundum mullite hollow sphere with a gradient structure and a preparation method thereof, and belongs to the field of heat-insulating refractory materials. The preparation method comprises the following steps: firstly, high-alumina bauxite is beneficiated and classified and homogenized, then, according to a certain mass percentage, III-grade high-alumina bauxite, silica, mixed additives and an organic binder are uniformly mixed and granulated; taking spherical particles as cores, II-grade high-alumina bauxite and I-grade high-alumina bauxite are sequentially wrapped under the rotation of a granulator to obtain a non-homogeneous spherical particle blank body with a SiO2-rich interior; and finally, the corundum mullite hollow sphere with the gradient structure is obtained through high-temperature calcination. The refractory hollow sphere is designed with the gradient structure through the combined process of high-alumina bauxite classification and homogenization, coating forming and high-temperature calcination in-situ pore forming, the phase performance characteristics of corundum and mullite are fully utilized, and the refractory hollow sphere with the low thermal conductivity, the good corrosion resistance, the high use temperature and the excellent thermal shock resistance is developed.

The invention discloses long-acting self-cleaning domestic ceramic and a preparation process thereof, and belongs to the technical field of ceramic. Comprising the following steps: firing a ceramic body; the preparation method comprises the following steps: loading cobalt-zinc-doped titanium by using carboxylated cellulose nanofibers to obtain a material A; chelating the material A with a manganese source, and crystallizing to obtain a material B; carrying out surface hydrophilic modification treatment on the material B, and roasting to obtain a material C; mixing kaolin, calcite, potassium feldspar, albite, high bauxite and mullite, carrying out ball milling, adding deionized water, ethylene glycol, calcium oxide, sodium tripolyphosphate and the material C, and continuously carrying out ball milling to obtain glaze; the long-acting self-cleaning domestic ceramic is obtained by applying the glaze to the ceramic body, drying, firing and cooling, and the long-acting lasting self-cleaning antibacterial performance of the domestic ceramic is improved.

The invention discloses a polyolefin cable material for an energy storage cable and a preparation method thereof, and relates to the technical field of cable materials, the polyolefin cable material comprises the following preparation raw materials by mass: 30-55 parts of matrix resin, 40-70 parts of a flame retardant, 2-10 parts of a compatible flexibilizer, 1-8 parts of a smoke suppressant and 1.0-5.0 parts of a processing aid; the flame retardant comprises coated aluminum hypophosphite and ceramic powder; the ceramic powder is mullite powder treated by amino silicon oil, and the coated aluminum hypophosphite is aluminum hypophosphite coated by ammonium polyphosphate and melamine-formaldehyde resin. The preparation method comprises the following steps: S1, preparing the raw materials according to the required ratio, premixing the matrix resin, and thermally mixing the other preparation raw materials to obtain a premix; and S2, carrying out melt blending, extrusion, cooling and grain-sized dicing on the premix to obtain the polyolefin cable material for the energy storage cable. The polyolefin cable material for the energy storage cable has the advantages of being high in toughness and free of molten drops on the basis of being high in flame retardance and low in fuming property.

The invention provides surface-modified aluminum oxide nanoparticles as well as a preparation method and application thereof, and belongs to the technical field of nanoparticles and 3D printing materials. The alumina nanoparticle has a core-shell structure, an inner core is an alumina nanoparticle, and a shell layer is prepared by carrying out hydrolytic polycondensation on an organic silicon oligomer containing a photosensitive group and other organic silicon monomers. The surface-modified aluminum oxide nanoparticles are obtained by adding an organic silicon monomer containing a photosensitive group and other organic silicon monomers into an aluminum oxide nanoparticle dispersion liquid and carrying out hydrolytic polycondensation. The finally prepared modified aluminum oxide nano particles have nano sizes, have good dispersibility and stability in various photoactive diluents, and have low viscosity and high photoactivity, the preparation process is simple, the cost is low, and the method is suitable for industrial production. The mullite material with excellent mechanical properties and a complex topological structure can be prepared in batches through a 3D printing technology, and the market value is huge.

The present application relates to the technical field of special functional coating materials for lost foam casting, and specifically discloses a special coating for large machine tool castings, and application and use method thereof. The present application synergistically strengthens full-temperature-range functional composite materials and composite aggregates, and uses mullite for high-temperature strengthening. Temperature-sensitive polymer modified graphite can realize intelligent temperature response of graphite performance. Lithium feldspar as a thermal expansion adaptive fluxing agent is more conducive to the medium-temperature healing and thermal expansion adjustment of the coating system. Composite reinforcing fibers are used to enhance and toughen the thick and large workpiece with large thermal stress. Boron-containing glazing agent as an ultralow-temperature glazing agent can form an initial liquid phase at about 450 DEG C, seal the surface of the coating, and purify the air passage. Rare earth oxides as high-temperature phase stabilizers can be solid-solved in the mullite lattice, improve the high-temperature phase stability, and refine the ceramic nodes. Through raw material design, the coating system has improved ultrahigh strength and crack resistance at extreme high temperatures under the premise of ensuring moderate air permeability.

The invention discloses a high-bending-resistance and low-dielectric-loss LTCC substrate preparation method and an LTCC substrate, and the method comprises the steps: mixing inorganic powder, an organic system and a solvent through ball milling, dissolving and stirring, and preparing a green ceramic chip through a tape casting technology; carrying out lamination, warm isostatic pressing, cutting, glue discharging and sintering on the green ceramic chip to obtain the LTCC substrate; the inorganic powder comprises sodium borosilicate glass, aluminum oxide and mullite whiskers. According to the invention, the sodium borosilicate glass is used as a glass phase, the mullite whisker and the alumina powder are used as ceramic phases, and the excellent mechanical properties and extremely low dielectric loss of the mullite whisker are utilized to modify the sodium borosilicate glass-alumina composite material. The problems that an existing sodium borosilicate glass-aluminum oxide LTCC composite material is low in bending strength and high in dielectric loss are solved.

Coated components and their methods of formation are provided. The coated component includes: a ceramic matrix composite substrate comprising silicon carbide and having a surface; a bond coat on the surface of the substrate; and an environmental barrier coating on the bond coat. The bond coat includes a plurality of discrete particles dispersed within a matrix phase that includes mullite. The plurality of discrete particles includes an oxygen getter and a transition metal oxide.

The invention discloses a whisker-reinforced composite porous ceramic material as well as a preparation method and application thereof, which are based on a new process of combining silicon carbide and cordierite and are combined with factors such as silicon carbide particle size and sintering conditions to really realize effective combination of low thermal expansion characteristic of cordierite and high strength characteristic of silicon carbide. The invention aims to synchronously improve the thermal shock resistance and mechanical bearing capacity of a product so as to provide a DPF filter body material with better performance. Furthermore, in order to optimize the filtering performance, mullite whiskers grow in the composite matrix in situ, and a more efficient particulate matter trapping network is constructed, so that the mechanical reliability, the thermal stability and the filtering efficiency are synergistically improved.

The invention discloses a preparation method of a medium-low temperature wear-resistant castable for the lithium salt industry. The preparation method comprises the following steps: S1, dry mixing of raw materials; S2, preparation of a wear-resistant composite material; and S3, wet mixing and stirring. According to the method disclosed by the invention, the wear resistance of the castable is enhanced by compounding the light mullite and the phenolic resin, and the thermal shock resistance of the material is improved by floating a low-density light mullite sheet to form a wear-resistant surface layer; the tensile strength and toughness of the material are effectively enhanced and the crack resistance of the castable is improved through the surface activation treatment and hot pressing process of the carbon fibers; through the synergistic effect of SiC and ZrO2, SiC provides high hardness and wear resistance, ZrO2 enhances the toughness and thermal stability of the material, and the comprehensive performance of the castable under the medium and low temperature working conditions is remarkably improved by combining the accurate proportioning of the dry blend and the ultrasonic wet mixing and stirring technology.

The present application relates to bulk handling and transport equipment technical field, specifically is related to a kind of artificial synthetic mullite's loading equipment, including feed cylinder, driving arm, throwing material disc and material blocking assembly.The buffer flow passage in feed cylinder is used to reduce the impact of falling material;Driving arm is used to drive feed cylinder to displace in vertical and horizontal direction, facilitate to go into car hopper operation;Throwing material disc rotation is arranged below feed cylinder for centrifugal throwing material.Material blocking assembly is arranged below throwing material disc, including lifting base and two groups of symmetrical material blocking piece, and each group of material blocking piece contains telescopic arm and several flexible material blocking strips.Through lifting base and telescopic arm linkage, flexible material blocking strip forms two symmetrical barrier zones in the periphery of throwing material disc, for intercepting stone material thrown to the width direction of car hopper, prevent stone material from accumulating in the same area, while the empty area between barrier zone allows stone material to be normally thrown out.The present application is compact in structure, realizes the self-adapting uniform filling of car hopper, and reduces the material breakage rate.

The application discloses a ladle heat-insulating high-strength light-weight castable which is prepared from the following raw materials in percentage by mass: 45-60% of mullite hollow spheres, 5-10% of expanded perlite, 5-10% of polycrystalline mullite fiber, 5-10% of magnesium oxide fine powder, 1-5% of aluminum powder, 1-5% of binding clay, 2-8% of rho-Al2O3 micro powder, 1-5% of sodium lignosulfonate, and 1-4% of SiO2 micro powder. The castable provided by the application has high strength, low thermal conductivity and good thermal shock resistance, can be used for ladle permanent layer castable, can effectively reduce the temperature of a ladle shell, plays a ladle heat-insulating role, can reduce the temperature of molten steel when a converter is tapped, reduces energy consumption, and reduces the cost per ton of steel.

This invention proposes a mullite composite brick, its preparation method, and its applications, belonging to the field of refractory materials technology. MXene is prepared by etching the MAX phase with hydrofluoric acid, and Si / Al oxide intercalated MXene is prepared by sol-gel reaction. After modification with polydopamine, intercalated montmorillonite is obtained by adding it to a sodium-based montmorillonite suspension. This intercalated montmorillonite is then uniformly mixed with a binder, high-alumina bauxite, and silicon carbide powder, machine-pressed, and calcined to obtain the mullite composite brick. The mullite composite brick prepared by this invention has good thermal insulation, heat insulation, refractory, and mechanical properties, excellent alkali resistance, improved bonding strength, and extended service life. It also has excellent thermal insulation effect, reduces heat loss, and thus plays a role in energy saving, showing broad application prospects.

The utility model relates to the technical field of refractory materials, and discloses a reinforced silicon mullite brick which comprises a silicon mullite brick base body, a groove and a protruding block are arranged in the middle of the left side and the middle of the right side of the silicon mullite brick base body respectively, and the groove and the protruding block are matched in shape. The silicon mullite brick base body comprises a base body layer, a heat preservation layer and a corrosion-resistant layer, the heat preservation layer is arranged on the periphery of the base body layer, the corrosion-resistant layer is arranged on the periphery of the heat preservation layer, the thickness of the heat preservation layer is 4-6 mm, and the thickness of the corrosion-resistant layer is 3-5 mm. According to the reinforced silicon mullite brick disclosed by the utility model, a multi-layer structure is arranged, the basic high-temperature resistance and erosion resistance are provided by the base body layer, the toughness and impact resistance of the base body layer are enhanced by adding the carbon fibers, and the heat preservation and heat insulation capability is improved by the heat preservation layer, so that the heat preservation and heat insulation capability of the silicon mullite brick base body is further improved; the corrosion-resistant layer and the ceramic protective layer obviously improve the corrosion resistance and the strength of the brick body, so that the overall performance of the silicon mullite brick is greatly improved, and the service life of the silicon mullite brick is greatly prolonged.

The mullite high-temperature hot patching material is prepared by mixing the electro-fused mullite, the bimodal alumina micro powder, the additive modified powder, the electro-fused mullite, the fast sintering agent, the clay, the coagulant and the sintering aid, carrying out hot-state patching construction operation by adopting an injection machine or a spray gun, and carrying out fast reaction and sintering in a hot state to obtain a compact refractory material. The refractoriness of the generated refractory material is greater than or equal to 1750 DEG C, the load softening point is greater than or equal to 1700 DEG C, and the refractory material can bear 1700 DEG C high-temperature