106results about How to "With thermal shock resistance" patented technology

The invention relates to ceramic coating used for a heating furnace. The ceramic coating comprises the following components: ceramic micro powder, an inorganic bonding agent and a linear thermal expansivity regulator. The invention also provides a method for preparing the ceramic coating for the heating furnace. The ceramic coating has the characteristics of having improved radiance and thermal shock resistance, being efficient and energy-saving, prolonging the service life of furnace linings and furnace tubes, improving temperature uniformity and the like, as defined below: (1) the energy consumption is reduced, the energy is saved by more than 3 percent and pollutant discharge is reduced; (2) the temperature uniformity in the heating furnace is improved: (3) the metallurgy stability of the furnace tube of the heating furnace is improved, the coking and scaling of the furnace tub are delayed, and the absorbing capacity of the furnace tube can be maximized; (4) the emissivity of the surface of the refractory lining layer can be maximized so as to increase the secondary radiation of radiant heat (energy) and increase the efficiency of the radiant section; and (5) the outer wall temperature and the exhaust gas temperature of the heating furnace can be reduced by more than 5 percent.

The invention provides a slide plate brick for slag stopping of a converter. The slide plate brick is produced from, by mass, 45-60% of tabular corundum, 10-30% of zirconia mullite, 6-14% of alumina micro-powder, 4-10% of metallic aluminum powder, 2-8% of silicon carbide, 1-3% of clay, 1-3% of carbon black, 0.5-1.5% of boron carbide, 0.5-1.5% of aluminum fibers and 4-6% of a composite resin binder. The slide plate brick for slag stopping of the converter is produced through selecting specific kinds and proportions of the raw materials without high temperature calcination, can be used multiple times, and has good resistance to corrosion, scour, oxidation and thermal shock.

The invention relates to an aluminum silicon carbide carbon brick for a torpedo tank and a preparation method thereof. The aluminum silicon carbide carbon brick comprises the raw materials by weight percent: 10-30% of special grade alumina, 15-35% of sub-white fused alumina being 1-3mm, 5-15% of silicon carbide, 2-10% of andalusite, 5-15% of crystalline flake graphite, 5-15% of 325-mesh sub-white fused alumina, 1-10% of nitride, 2-3% of metal aluminum powder and 3-5% of phenolic resin. The aluminum silicon carbide carbon brick is prepared by mixing the raw materials in the proportion, molding and drying. According to the invention, a corundum mullite phase is formed in the process of using the finished product and combined with nitride by adjusting the composition of the raw materials and adding nitride, so that the corrosion resistance, the scouring resistance and the high-temperature volume stability of the brick can be improved; compared with the common Al2O3-SiC-C (ASC) brick, the aluminum silicon carbide carbon brick improves the furnace age by about 15%.

The invention discloses a method for maintaining a coke dry quenching furnace. The method comprises the following steps of: firstly, carrying out construction preparation; then, building an isolation shed to achieve the safety requirement on simultaneous construction in a plurality of construction areas; sequentially carrying out constructions of applying an interfacial agent, ramming a liner which consists of firm plasticizing materials and anchoring bricks, and treating a working surface of the liner; and finally baking the furnace. The invention has the advantage that by adopting the isolation shed, construction mode on areas required to be maintained are changed from a traditional rotating maintenance mode into a simultaneous maintenance mode on a plurality of areas, thereby shortening the maintenance period, and enhancing the work efficiency; by adopting the liner consisting of the firm plastic materials and the anchoring bricks, the furnace body has the excellent performances ofhigh strength, good structure, strong wear-resisting property, thermal shock resistance and the like, thereby the service life of the furnace body is prolonged.

The invention provides a cement kiln coal injection pipe castable, which adopts high purity aluminium magnesium spinel as main raw material, selects pure calcium aluminate cement as bonding agent, alumina superfines as additive. The invention integrates the advantages of high refractoriness, high resistance to thermal shocks, high strength and abrasion resistance, meanwhile the service life can break down the record of the 4 month of the external product and exceed 8 month.

The invention relates to an anti-erosion iron runner castable for a large blast furnace. The material comprises, according to weight percentage, 58-64 parts of compact brown fused alumina particles, 2-5 parts of white corundum particles, 16-23 parts of silicon carbide, 5-7 parts of aluminum oxide micro-powder, 2-3 parts of pure calcium aluminate cement, 2-3 parts of silicon dioxide micro-powder, 1.5-2.5 parts of spherical asphalt particles, 0.5-1.2 parts of carbon black powder, 1.5-3.5 parts of metal silicon powder, 0.2-0.6 part of boron carbide, 0.1-0.2 part of metal aluminum powder, 0.15-0.2part of a water reducing agent, 0.6-1 part of an anti-erosion agent and 0.05-0.08 part of explosion-proof fibers. According to the castable, the service life of a primary runner of a main runner is prolonged, and the stability of safe operation of an iron runner is improved. It is verified that the requirements for rapid baking without cracking, erosion resistance, oxidation resistance, slag adhesion resistance and iron flux can be met, the iron flux can reach 180000 tons or above without repairing, and good application prospects are achieved.

The invention relates to a phosphate bonded castable adopting a composite hardening accelerator, belonging to the technical field of refractory materials. The phosphate bonded castable is prepared from the following main raw materials in percentage by mass: 55-75wt% of aggregate, 9-40wt% of powder material, 5-16wt% of composite hardening accelerator, 0.1-0.25wt% of corrosive inhibitor and 8-18wt% of bonding agent, wherein the aggregate is corundum or high-aluminum bauxite; the powder material comprises 0-37wt% of corundum powder, 0-37wt% of bauxite powder, 1-8wt% of SiO2 micropowder and 3-12wt% of alpha-Al2O3 micropowder; the composite hardening accelerator is pure calcium aluminate cement and rho-Al2O3 micropowder; the corrosive inhibitor is an NH66 type inhibitor, and comprises the main chemical component of bismuth oxyiodotannate; and the bonding agent is phosphate (aluminum phosphate solution), and the P2O5/Al2O3 ratio is 1/2.5-1/3.8. The phosphate bonded castable has the advantages of high strength, wear resistance, thermal shock resistance, short stripping time, capability of being quickly baked and the like, and has excellent high-temperature resistance.

The invention discloses an environment-friendly ceramic material which comprises the following components in parts by weight: 100-150 parts of kaolin, 20-30 parts of silicon carbide, 30-40 parts of active carbon powder, 10-15 parts of nano zirconium dioxide, 25-50 parts of glass fibers, 20-30 parts of carbon fibers, 80-100 parts of dolomite powder, 5-10 parts of octaphenyl polyoxyethyiene, 5-10 parts of polydimethylsiloxane and 10-15 parts of trimethyl hexanediamine. The environment-friendly ceramic material is subjected to high-temperature sintering and has the characteristics of high hardness, corrosion resistance, good thermal change resistance, thermal shock resistance, impact resistance and the like; an adsorption material capable of adsorbing toxic and harmful substances is added into ceramics, so that when the ceramic material is used, the toxic and harmful substances can be adsorbed to some degree, thus cleaning the environment and improving the living quality of human beings.

The invention relates to a self-lubricating wear-resistant ceramic for cutting tools, which is prepared from the following raw materials in parts by weight: 2-3 parts of bismuth sulfide, 2-3 parts of diethanolamine, 2-3 parts of ammonium sulfate, 2-3 parts of magnesium chloride, 2-3 parts of calcium carbide sludge, 2-3 parts of graphene oxide, 0.6-0.8 part of KOH, 0.2-0.3 part of polyoxyethylene castor oil, 3-4 parts of magnesium oxide, 36-40 parts of titanium boride, 4-5 parts of nano tungsten trioxide, 30-35 parts of titanium carbide, 3-5 parts of beryllium oxide, 1-2 parts of silver powder, a right amount of ethanol, a right amount of deionized water, 1-1.5 parts of polyacrylic acid, 1.2-1.6 parts of polyethyleneglycol and 4-5 parts of antiwear assistant. The added nano tungsten trioxide enhances the high temperature resistance of the ceramic. The ceramic has the characteristics of high temperature resistance, high carrying capacity, self lubrication, thermal shock resistance, high wear resistance and the like, and is suitable for manufacturing cutting tools. The antiwear assistant can enhance the wear resistance and heat resistance of the ceramic.

The invention provides a high-temperature nano radiation coating for a heating furnace and a preparation process thereof. The coating comprises radiation function powder particles, an inorganic adhesive and an expansion coefficient regulator. The preparation process comprises the following steps: preparing the radiation function powder particles, preparing the expansion coefficient regulator, synthesizing the inorganic adhesive, mixing the radiation function powder particles, the inorganic adhesive and the expansion coefficient regulator, and filtering and grinding the obtained mixture so as to obtain the high-temperature nano radiation coating for the heating furnace. The high-temperature-resistant nano radiation coating disclosed by the invention has the characteristics of capability of increasing the radiance and the thermal shock stability, energy conservation and environmental friendliness, corrosion resistance, and capability of prolonging the service life of the heating furnace and raising the temperature uniformity, and the like. The technical indexes of the products provided by the invention are as follows: a temperature of 1800 DEG C can be resisted, the radiance epsilon is greater than or equal to 0.92, the thermal shock resistance (1300 DEG C) is greater than or equal to 5 times, the thickness of the coating is 0.1-0.2 mm, and the service life is greater than or equal to 6 years.

The invention relates to large or specific compound magnesium-aluminum spinel products with the formula of 48 to 56 percent of 5-1mm magnesium-aluminum spinel, 12 to 22 percent of 1-0.088mm magnesium-aluminum spinel, 16 to 25 percent of magnesium-aluminum spinel with d90 less than 0.088mm, 3 to 6 percent of magnesium-aluminum spinel with d90 less than 0.010mm, 3 to 15 percent of beta alumina powder with d95 less than 0.020mm, 2 to 6 percent of hydratable alumina, 1 to 5 percent of magnesium promoter, 0.05 to 0.4 percent of external efficient water reducing agents (polycarboxylic acid plus sulfonation naphthaldehyde polymer plus sulfonation melamine polymer), 1 to 6 percent of latex of the system of external polyacrylic acid and 1 to 6 percent of external water. The magnesium-aluminum spinel composite combined refractory has the following chemical compositions: 72 to 87 percent of Al2O3, 12 to 27 percent of MgO, 0.2 to 1.5 percent of Na2O and 0.1 to 0.5 percent of SiO2. The raw materials are weighed according to the ratios, and are mixed, molded and maintained to make billets, and then are subjected to the processes of drying, firing at the temperature of 1430 to 1650 DEG C and inspection and the like so as to make products of large or specific compound magnesium-aluminum spinel refractory. The magnesium-aluminum spinel product has excellent manufacturing performance and excellent performances of high-temperature resistance, erosion resistance and creep resistance. As the products are casted and moulded, large and specific products can be produced.

The invention discloses a preparation method of a calcium-based adsorbent. According to the preparation method, natural quartz stone powder (including a main component SiO2) and active carbon powder are taken as raw materials for preparing silicon oxynitride by adopting a carbon thermal reduction method; and silicon oxynitride is used as an inert supporting material and is treated by a process of immersing, drying and calcining to load CaO so as to prepare the calcium-based adsorbent. By controlling the CaO precursor and calcining conditions, relatively good circulating stability is obtained. The raw material has a wide source, the preparation method is simple and convenient and the operability is strong; and the problem that the adsorption capacity of the high-temperature CO2 calcium-based adsorbent is reduced after a plurality of times of CO2 adsorption/desorption cycles is improved very well.

The invention discloses a preparation method of a tundish air brick. The preparation method comprises the following steps of: (1) placing 45-55 parts by weight of tabular corundum granules, 10-14 parts by weight of mullite granules and 5-8 parts by weight of chromic oxide granules into a mixer, and mixing for 5-8 minutes; (2) placing 4-6 parts by weight of white corundum fine powder, 2-3 parts by weight of alpha-Al2O3 fine powder and 1.5-3.5 parts by weight of silica micropowder into the mixer, and mixing for 10-15 minutes; (3) adding a mixture prepared from the step (1) to the mixer used in the step (2), mixing for 10-15 minute again, adding 0.4-0.6 part by weight of sodium hexametaphosphate, 0.3-0.5 part by weight of yellow dextrin, 0.1-0.3 part by weight of azodicarbonamide, 0.2-0.4 part by weight of boric acid and 0.1-0.3 part by weight of aluminum fluoride, and then mixing for 10-15 minutes again; (4) ageing for 1-2 hours, pressing for forming by using a press machine, and drying into a drying kiln at 200 DEG C for 24 hours; (5) firing under the condition of 1250-1350 DEG C for 2-3 hours.

The invention relates to a repair welding method for a magnesium alloy casting oil way. A graphite material is used as a repair welding base plate for carrying out repair welding on defects of a casting, so that the purpose of repair is achieved. The characteristics of softness, easy removal, high temperature resistance and thermal shock resistance of graphite are utilized, in the using process, the repair welding base plate can bear acute changes of temperature so that damage and cracks can be prevented, and has various properties needed by an argon arc welding base plate, it is possible to repair the defects of the magnesium alloy casting oil way part, and the purpose of saving the casting is achieved.

The invention discloses a preparation method of a refractory high-entropy alloy skeleton-copper spontaneous perspiration composite structure. The method comprises the following steps of: smelting a refractory high-entropy alloy raw material to obtain an alloy ingot, and preparing refractory high-entropy alloy powder from the alloy ingot by using a plasma rotating electrode atomization method; forming the refractory high-entropy alloy powder into a preset porous skeleton structure through an electron beam or selective laser melting additive manufacturing process; and infiltrating metal copper into the porous skeleton structure by adopting an infiltration process, thereby obtaining the refractory high-entropy alloy skeleton-copper spontaneous perspiration composite structure. The structure has the characteristic of spontaneous perspiration, and is suitable for high-temperature parts such as rocket engine nozzle throat inserts, thrust chamber injector panels, missile warhead nose cones and electromagnetic gun tracks. The prepared composite structure has the advantages that the forming process is simple, the porosity can be conveniently designed and adjusted according to actual requirements, the mechanical property is good, high temperature resistance and thermal shock resistance can be achieved, and high practical value is achieved.

The invention discloses a silicon carbide reinforced carbon matrix composite material and a preparation method. Mesocarbon microbeads are adopted as the matrix, and silicon carbide ceramic is adoptedas the reinforcement phase and is evenly distributed among the carbon microbeads so as to form a three-dimensional network silicon carbide skeleton reinforced isotropic structure. Technically, siliconpowder particles and the mesocarbon microbeads are taken as the raw materials to prepare uniform and thickness controllable silicon carbide coating coated mesocarbon microbead powder by molten salt method, after pre-press molding, discharge plasma sintering is carried out at 1600-1900DEG C to form a uniform three-dimensional network silicon carbide ceramic skeleton, while the strength, ablation resistance, oxidation resistance and thermal shock resistance of the carbon matrix are improved, the thermal conductivity of the matrix is also improved, therefore the isotropic carbon matrix compositematerial characterized by low cost, low density and excellent mechanical properties, sintering properties, thermal shock resistance, ablation resistance and thermal conductivity can be formed. Because of the excellent comprehensive performance, the silicon carbide reinforced carbon matrix composite material can be widely applied to aerospace, national defense, electronic packaging and other fields, and has broad application prospects.

The invention provides a quartz glass tube silicon chip bracket component for a mesh belt-free silicon chip sintering furnace. The component comprises a quartz glass tube, metal sleeves, support legs and limiting screws, wherein the support legs are fixed on the metal sleeves; the metal sleeves are provided with threaded holes and are fixed on the quartz glass tube at equal intervals through the limiting screws; the support legs are made of steel wires; and the surfaces of the steel wires are coated with ceramic coatings. The quartz glass tube has the advantages of high intensity, high temperature resistance, low expansion coefficient, thermal shock resistance, acid resistance, chemical stability, high electrical insulating property, small heat absorption capacity and the like and is very suitable to be taken as a silicon chip bracket. The support legs are made of steel wires and the surfaces of the steel wires are coated with ceramic coatings, so that the requirements on intensity, high temperature resistance and wearing resistance of the support leg are met and metal ion pollution of a silicon chip caused by metal contact in a sintering process is reduced. Each metal sleeve is provided with an opening and a threaded hole, so that the metal sleeve is convenient to fix on the quartz glass tube.

The invention discloses surface glass used for preparing an optical fiber faceplate, relates to the field of optical fibers, and overcomes a problem that sealing between an optical fiber faceplate and other parts is bad. Raw materials of the surface glass comprise 45-75% by mass of silica, 1-15% by mass of calcium oxide, 1-18% by mass of boric oxide, 0.1-2% by mass of magnesium fluoride, 1-14% by mass of aluminum oxide, 0.1-2% by mass of bismuth oxide and 0.1-4% by mass of barium oxide. The optical fiber faceplate prepared from the surface glass is high in cathode sensitivity, compatible with photocathode materials and capable of resisting thermal shock and mechanical vibration, and is advantageous in that sealing between the optical fiber faceplate and other parts is good.

The invention relates to a carbon/ceramic heat proof compounding material and the manufacturing method. The wt% of the material is C squama 25-65, ceramic powder SiC+B₄C 30-60, of which SiC: SiC+B₄C=5:1, TiO₂ 5-13, adopting acetone phenolic resin as binding agent. Mixing the constituents, molding at the pressure of 30-50MPa, keeping the temperature and cooling to room temperature, the material would be gained. The invention has the feature of light, high intensity, high toughness, antifriction, high temperature poof, and anti-oxidation.

The invention discloses a dispersion strengthened ceramic composite material and a preparation method thereof and belongs to the field of composite materials and engineering ceramic materials. The composite material is formed by compounding silicon carbide of different forms, calcium sulfate whiskers, metal fibers and a composite adhesive, wherein the silicon carbide of different forms, the calcium sulfate whiskers, the metal fibers and the composite adhesive are interweaved and distributed. The preparation method comprises the following steps: 1) uniformly mixing the silicon carbide, the calcium sulfate whiskers, the metal fibers and the composite adhesive under vacuum conditions so as to prepare slurry; 2) vibrating and casting the slurry in a mold under vacuum; and 3) curing the mold and cast slurry, thereby obtaining the dispersion strengthened ceramic composite material. According to the method disclosed by the invention, the problems of wear and corrosion of highly corrosive solid-liquid media on pump materials during transport are effectively solved, and the prepared composite material has the characteristics of high metal matrix adhesion force, high hardness, wear resistance, corrosion resistance, oxidation resistance, thermal shock resistance and the like and is applied to the fields of chemical industry, pharmacy, papermaking and the like.

The invention discloses a ceramic paint which is composed of following raw materials including 20-50 parts of ceramic fiber, 50-80 parts of silicon micro-powder, 60-95 parts of hollow glass microbeads, 200-250 parts of kaolin, 6-8 parts of di-(2-ethylhexyl) phthalate, 10-12 parts of glycerol, 2-3 parts of dimethylbenzene, 5-8 parts of epoxy resin, 6-9 parts of sodium hexametaphosphate, 12-15 parts of sodium hydroxide, 5-10 parts of trisodium phosphate, 3-10 parts of sodium carboxymethylcellulose, 2-5 parts of hydroxyethyl cellulose, 5-10 parts of hydroxypropyl methyl cellulose, 3-10 parts of titanium carbide, 5-10 parts of titanium dioxide, 3-5 parts of zirconium nitride, 6-10 parts of titanium hydride, 5-8 parts of sodium carbonate, 8-15 parts of calcium carbonate, 12-15 parts of silicone oil, 12-15 parts of polydimethylsiloxane, 10-15 parts of carbon black, 15-20 parts of paraffin, 12-15 parts of graphene, 5-10 parts of magnesium nitride, 5-10 parts of magnesium oxide, 3-6 parts of silicon oxide, 3-8 parts of nano silicon dioxide and 300-350 parts of pure water. In the ceramic paint, the raw materials are reasonably blended. The paint has a high-temperature anti-oxidation property and a thermal shock resistant property when being sprayed on or brushed on a lining layer.