16results about How to "High refractoriness" patented technology

The invention provides a cast iron sand mold coating and a preparation method thereof, and relates to the field of casting sand mold coatings. The cast iron sand mold coating is composed of the following raw materials: a fireproof filler, a liquid carrier, a suspending agent, a binder and an auxiliary agent. The raw materials comprise, by weight, 65-70% of the fireproof filler, 19-25% of the liquid carrier, 2-4% of the suspending agent, 4.4-5.5% of the binder and 2.4-3% of the auxiliary agent; the refractory filler is composed of magnesia powder, zircon powder and graphite powder; the magnesia powder is composed of light magnesia powder and heavy magnesia powder. According to the cast iron sand mold coating and the preparation method thereof, the problems that an existing shielding type coating is thin in anti-sulfuration coating thickness, poor in anti-sulfuration coating stability, general in anti-sulfuration effect and large in gas forming amount can be effectively solved, poor spheroidization and casting defects of castings are effectively avoided, the production cost is reduced, and the stability of the castings is improved.

The invention relates to the technical field of fused alumina zirconia bricks, in particular to a fused alumina zirconia refractory brick and a preparation technology.The fused alumina zirconia refractory brick is prepared from, by weight, 55-65 parts of alumina powder, 25-35 parts of zircon sand, 1-5 parts of modified nanometer alumina powder, 2-6 parts of binder, 1-2 parts of chromic oxide, 1-3 parts of yttrium oxide and 1-4 parts of fluxing agent. Through in-situ growth of a layer of carbon nanotube core-shell structure on the surface of nano-alumina, the core-shell structure can prevent direct contact between nano-alumina particles, so that the possibility of nano-alumina agglomeration is reduced, and nano-alumina is uniformly distributed in the corundum amorphous refractory brick. A finer dispersed phase is formed in the brick body, so that the expansion of cracks is hindered, and the toughness and the strength of the brick body are improved.

The invention relates to a forsterite checker brick for a heat storage chamber of a hot blast stove, which is characterized by comprising the following components in percentage by weight: 70-75wt% of natural forsterite; 10 to 20 weight percent of clay; 5-10 wt% of magnesium oxide; 1-3 wt% of magnesium chloride; and 4-8 wt% of a binding agent. The invention has the following beneficial effects: natural forsterite is used as a main material, a certain amount of clay is added as an aggregate, a proper amount of magnesium chloride and magnesium oxide are introduced as a modifier, the brick is weakly alkaline, the main mineral phase is M2S and MgAl2O4, the apparent porosity is small and is about 13-15%, the load deformation temperature is high and is about 1720-1800 DEG C, and the brick has good thermal insulation performance. And the product has excellent chemical mineral structure, physical property and thermal shock resistance.

The invention relates to an electric arc furnace gunning mix which comprises the following components in parts by weight: 35-55 parts of bauxite, 15-25 parts of silicon carbide (SiC), 10-25 parts of white corundum, 3-8 parts of silicon oxide (SiO2), 2-5 parts of silicon nitride (Si3N4), 0-3 parts of zirconium diboride (ZrB2), 3-8 parts of coke powder, 0-8 parts of a sintering aid and 5-10 parts of a binding agent, and the zirconium diboride is not zero. The method has the beneficial effects that a high-temperature ceramic body containing a ZrB2-SiC multiphase material is generated at a damaged furnace lining part through added zirconium diboride and silicon carbide and coke powder in the zirconium diboride under the action of a sintering aid, and the high-temperature ceramic body has good oxidation resistance, thermal shock resistance and ablation resistance, so that the service life of the electric arc furnace lining can be greatly prolonged.

The invention relates to the technical field of refractory materials, and provides a refractory silicon carbide castable which comprises the following components in parts by weight: 30-50 parts of silicon carbide particles, 10-20 parts of silicon carbide fine powder, 5-15 parts of corundum fine powder, 5-10 parts of calcium aluminate cement, 3-8 parts of silica powder, 0.5-2 parts of a dispersing agent, 0.5-2 parts of a water reducing agent, 0.1-0.5 part of explosion-proof fibers and 5-10 parts of water. Through matching of silicon carbide, corundum fine powder, calcium aluminate cement and the like with specific raw material granularity and components, the castable is stable in structure at high temperature, high in refractoriness, capable of effectively resisting erosion, good in mechanical property, capable of keeping stable and reliable under different working conditions, suitable for various high-temperature industrial kilns, safe and efficient in production and suitable for industrial production. By adopting a step-by-step mixing mode of dry mixing and wet mixing, the dispersing and water reducing effects can be better exerted, so that the performance of the castable is more stable and reliable, and the production efficiency and the stability of the product quality are improved.

The invention relates to a preparation method and application of a binary formula Dai pottery pug. The preparation method comprises the following steps: taking Dai pottery clay in the HongRiver basin, Wuhua soil in the HongRiver county and charcoal dust, and exposing and weathering the Dai pottery clay and the Wuhua soil for at least three months; the mass content of SiO2 in the Dai clay in the HongRiver basin is not less than 50%, the mass content of Al2O3 is not less than 15%, the mass content of Fe2O3 is not less than 10%, and the ignition loss is less than 10%; the content of SiO2 in the Wuhua soil in the Honghe county is 72%-82%, the content of Al2O3 is 9%-12%, and the content of Fe2O3 is 3%-5%; the preparation method comprises the following steps: adding water into the Dai pottery clay and the Wuhua soil according to the mass ratio of the Dai pottery clay to the Wuhua soil to the charcoal powder of (100-120): (40-50): (8-10), fully soaking, then carrying out ball milling, sieving slurry, then adding the charcoal powder, uniformly stirring, squeezing mud, draining, pugging and exhausting. According to the invention, the throwing and compression molding performances of the Dai pottery clay can be improved, the sintering temperature and the compactness and strength of the structure of the Dai pottery clay can be improved, and the burn out rate can be reduced.

The invention relates to a magnesian dry vibrating material and a preparation method thereof. The magnesian dry vibrating material comprises the following components in parts by weight: fused magnesite with the particle size of 1-3mm, fused magnesite with the particle size of 0.088-1mm, fused magnesite with the particle size of less than or equal to 0.088 mm, water glass, bischofite hexahydrate, kaolin, alumina micro powder and silica micro powder. The preparation method comprises the following specific steps: sequentially adding the fused magnesite with the particle size of 1-3mm, the fused magnesite with the particle size of 0.088-1mm and the fused magnesite with the particle size of less than or equal to 0.088 mm into a stirrer according to the ratio, and stirring for 5-10mm; then adding the water glass, the clofite hexahydrate and the kaolin, and continuously stirring for 3-5 minutes; finally, adding the aluminum oxide micro powder and the silicon micro powder into a stirrer, and stirring for 8-15 minutes to finally obtain a mixed material; and carrying out vibration molding on the mixed material, then baking at 200-250 DEG C for 3-5 hours, and demolding. The environment-friendly binding agent water glass is adopted to replace phenolic resin, so that the bonding strength is guaranteed, and meanwhile, generation and release of harmful gas are reduced.

The invention discloses a low-porosity, low-iron and low-creep clay brick and a preparation method thereof, and relates to the technical field of refractory materials, and the low-porosity, low-iron and low-creep clay brick comprises the following components in parts by weight: 30-45 parts of a mullite homogenized material, 12-20 parts of Anhui flint clay, 8-10 parts of sillimanite, 15-25 parts of kaolin, 10-20 parts of andalusite powder, 3-5 parts of raw silicon powder, 2-5 parts of potassium feldspar powder and 0.2-0.5 part of hydroxypropyl methyl cellulose. And 3-6 parts of an aluminum dihydrogen phosphate solution. The high-quality clay brick with low porosity, low iron, low creep deformation and high strength is successfully prepared by optimizing the raw material ratio and a composite binding agent system, and the high-quality clay brick is suitable for high-temperature industrial kilns with harsh performance requirements.

The invention relates to a casting coating composition which is suitable for high-alloy steel castings and comprises a coating I, a coating II and a coating III, the refractory aggregate in the coating I comprises the refractory aggregate I and the refractory aggregate II, the refractory aggregate I comprises the following chemical components in percentage by mass: 5-30% of Cr2O3 and 70-95% of Al2O3, the refractory aggregate II comprises the following chemical components in percentage by mass: 10-50% of MgO and 50-90% of Al2O3, and the weight ratio of the refractory aggregate I to the refractory aggregate II is (1: 3)-(3: 1); the refractory aggregate III in the coating II comprises the following chemical components in percentage by mass: 20%-40% of ZrO2 and 60%-80% of Al2O3; the refractory aggregate IV in the coating III comprises the following chemical components in percentage by mass: 50%-70% of ZrO2 and 30%-50% of SiO2; the coating further comprises a carrier solvent accounting for 20%-50% of the weight of the refractory aggregate and a binder accounting for 0.5%-8% of the weight of the refractory aggregate. And the sand burning problem and the orange peel defect of the high-alloy steel casting are effectively solved.

The invention belongs to the technical field of smelting and grinding tool manufacturing, and particularly relates to a method for preparing a zirconium-aluminum-based grinding tool pore-forming agent from fused zirconia corundum brick waste. The zirconium-aluminum-based grinding tool pore-forming agent is prepared by adding the fluxing agent into the zirconium-containing waste and adopting a melting and blowing method, the physical and chemical properties of the zirconium-aluminum-based grinding tool pore-forming agent are improved, meanwhile, the zirconium-aluminum-based grinding tool pore-forming agent can be applied to production of grinding tools such as grinding wheels, and the zirconium-containing waste is recycled. The zirconium-aluminum-based grinding tool pore-forming agent is a zirconium oxide hollow sphere pore-forming agent and can be directly used as a grinding tool pore-forming material. During use, large and small balls can be classified, and hollow balls with different particle sizes are used according to the requirements of grinding tool tissues. The zirconium-aluminum-based hollow ball grinding tool pore-forming agent prepared by the invention completely meets the requirements of grinding tool pore-forming agent conditions, has higher voids and higher refractoriness, and is environment-friendly and non-volatile when a grinding tool is sintered; the large-air-hole grinding tool prepared through the method has the advantages of being free of workpiece burning, high in strength, good in shape retentivity, high in durability and the like.

The invention discloses a method for preparing precoated sand by using cast steel waste sand, and belongs to the technical field of casting, and the method comprises the following steps: preparing regenerated sand by using the cast steel waste sand, heating the regenerated sand, sequentially adding alumina sol, phenolic resin, urotropine and calcium stearate into the heated regenerated sand in a stirring environment, and mixing to obtain the precoated sand. The method has the beneficial effects that the steel casting waste sand is used for preparing the reclaimed sand, so that the steel casting waste sand is recycled, the production cost is saved, and meanwhile green production is achieved; and the prepared reclaimed sand has the excellent properties of lower expansion coefficient, lower acid consumption value and the like, and can be matched with other components of the precoated sand to generate a better effect during production of the precoated sand.

A method for preparing a binary formula for Dai pottery clay and its application is disclosed. The method involves taking Dai pottery clay from the Honghe River basin, five-colored clay from Honghe County, and charcoal powder. The Dai pottery clay and five-colored clay are sun-dried and weathered for at least three months. The Dai pottery clay from the Honghe River basin has a SiO2 content of not less than 50%, an Al2O3 content of not less than 15%, an Fe2O3 content of not less than 10%, and a loss on ignition of less than 10%. The five-colored clay from Honghe County has a SiO2 content of 72-82%, an Al2O3 content of 9-12%, and an Fe2O3 content of 3-5%. The method involves soaking the Dai pottery clay and five-colored clay in water until fully saturated, then ball-milling them. The slurry is sieved, and then charcoal powder is added. After stirring evenly, the clay is pressed to drain water and then kneaded to remove air. This invention can improve the throwing and molding performance of Dai pottery clay, increase the sintering temperature and the density and strength of its structure, and reduce the burn-off rate.

The utility model relates to the technical field of liquid forging, in particular to a high-temperature-resistant extrusion structure suitable for liquid forging products, which comprises a liquid forging die core used for containing liquid forging products and an extrusion mechanism inserted in the liquid forging die core and used for extruding the liquid forging products. An extrusion sheath capable of moving up and down is inserted into the extrusion oil cylinder, a circle of steel sleeve is arranged at an opening in the top end of the extrusion oil cylinder in a sleeving manner, a fire-resistant bakelite plate is arranged at the top end of the extrusion oil cylinder on the outer side of the steel sleeve, and an extrusion sleeve is arranged on the outer side of the extrusion sheath in a sleeving manner; the steel sleeve is arranged at the top end of the extrusion oil cylinder, so that force borne by extrusion steel is transmitted through the middle narrow steel sleeve, the bakelite plate which is high in refractoriness and does not bear pressure is embedded in the steel sleeve, the heat insulation effect is achieved, the strength is effectively improved, the oil cylinder and internal sealing are protected against damage, and the service life of the oil cylinder is prolonged. And meanwhile, the extrusion efficiency is improved.

The invention discloses an anhydrous converter gunning mix and a preparation method thereof, and relates to the technical field of steelmaking. Comprising 15%-25% of 3-1 magnesia, 20%-30% of 1-0 magnesia, 8%-13% of liquid phenolic resin (externally added), 25%-35% of 200 fused magnesia, 1%-3% of 200-mesh aluminum powder, 3%-5% of asphalt powder, 2%-5% of crystalline flake graphite and 5%-10% of solid resin powder. The anhydrous converter gunning material can be smoothly sprayed without water by using graphite as a lubricant, and the resin and asphalt powder are added, so that the resin and the asphalt are quickly softened and separated out to play a bonding role after the anhydrous converter gunning material is sprayed out, and the anhydrous converter gunning material can be quickly bonded on a furnace wall; the strength of carbon-bonded bulk materials at high temperature is higher than that of water-bonded bulk materials, so that the durability is improved, and the loss of the converter lining is reduced.

The invention discloses a tundish spray coating, and relates to the technical field of tundish refractory materials, and the tundish spray coating comprises the following raw material components in percentage by mass: 22-25% of 3-1mm 91 magnesia, 10-20% of 3-1mm alumina, 10-20% of alumina, 10-20% of alumina, and 10-20% of alumina. The raw materials comprise 46%-51% of 94 magnesia with the particle size of 1-0 mm, 16%-20% of 94 magnesia with the particle size of 200 meshes, 1.5%-3% of 95 magnesia with the particle size of 800 meshes, 2%-3% of silica fume, 2%-3% of quick lime, 0.1%-0.15% of silicon whiskers, 0.4%-0.6% of 70 cement, 0.6%-0.8% of sodium metasilicate nonahydrate, 0.3%-0.5% of polyvinyl alcohol, 0.01%-0.03% of a composite water repellent agent, 0.5%-0.7% of paper fibers, 0.01% of organic fibers, 0.02%-0.03% of metal aluminum powder, 0.2%-0.3% of sodium tripolyphosphate and 0.1%-0.3% of citric acid. Compared with the traditional process, the tundish spray coating disclosed by the invention has the advantages that the construction water adding rate is obviously reduced, the comprehensive strength of the spray coating is greatly enhanced, the risk of cracking after drying is reduced, the service life of the spray coating is prolonged, and the construction efficiency, the construction performance and the continuity of continuous casting operation are improved.

The invention provides a flame-retardant heat-insulating foamed ceramic precursor as well as a preparation method and application thereof. The flame-retardant heat-insulating foamed ceramic precursor comprises the following components in parts by mass: 20-30 parts of silicate, 10-20 parts of a boron-containing compound, 1-15 parts of organic acid, 1-20 parts of a phosphorus-containing compound, 10-40 parts of a foaming agent and 20-100 parts of water. The flame-retardant and heat-insulating foamed ceramic precursor is in a liquid state, can be coated on a part needing to be protected in a plurality of modes such as roll coating, spray coating, film spraying and the like, and is subjected to a decomposition reaction and a cross-linking reaction under heating, high temperature or open fire according to a specific component proportion, so that a foamed ceramic flame-retardant layer is formed in situ, and an active fireproof effect can be achieved; the material has excellent flame-retardant and heat-insulating effects, and is suitable for various chemical power supplies, electrical equipment and electronic equipment.