143 results about "Zirconia alumina" patented technology

The invention relates to a resin bonding agent diamond grinding wheel and a manufacturing method thereof, and the grinding wheel comprises a grinding medium layer and a base body, wherein, the grinding medium layer is arranged on the base body and comprises diamond grinding medium, resin bonding agent, filling reinforcement which is a copper cladded iron powder and auxiliary abrasives which can be one or the combination of carborundum, boron carbide, white alundum, single alundum and fused zirconia alumina. The grinding medium layer comprises 5-15% of diamond grinding medium, 10-25% of auxiliary abrasive, 25-50% of thermosetting polyimide resin, 3-10% of copper cladded iron powder, 15-40% of silicon carbide powder and 0-8% of filling of metallic oxide in terms of volume percent. The diamond grinding wheel is characterized by low production cost, strong adhesive force, good sharpness and self-sharpness, long service life and good abrasion cutting effect.

A sealant composition for use in sealing solid oxide fuel cells is provided which comprises a glass component which comprises a mixture of alkali-free inorganic oxides, and an optional filler component dispersed in the glass component, said filler component being up to 40% by weight of the composition. The glass component can include, on a mole basis, 20 to 50% BaO, 1 to 10% Y₂P₃, 5 to 20% B₂O₃, 10 to 30% SiO₂, 3 to 35% MgO, 2 to 20% CaO, 1 to 10% ZnO, and 0 to 5% ZrO₂, and exemplary filler components include zirconia, alumina, barium titanate, strontium titanate, and combinations thereof.

The invention relates to a polymer wear-resistance coating material, which is a coating material consisting of a component A and a component B, wherein the component B is a solidifier, and the weight part of the component B is 2 to 10 percent of that of the component A; the component A consists of 40 to 80 weight parts of a main ingredient which is one or more mixed in random ratio of silicon carbide, fused zirconia alumina, fused sub-white corundum, fused brown aluminium oxide, fused white corundum and fused mullite, 1 to 5 weight parts of an auxiliary material which is one or more mixed in a random ratio of asbestos powder, glass-ceramic powder, titanium white, aluminium oxide powder and mica powder, 0.5 to 2 weight parts of reinforcing agent which is one ore more mixed in a random ratio of polypropylene fibers, glass fibers and carbon fibers, and 10 to 20 weight parts of a bonding agent which is polyurethane modified epoxy resin. The construction and use of the coating material are convenient and quick, the bonding strength of the coating material is high and the use cost of the coating material is low; and the coating material has high wear resistance, corrosion resistance and air corrosion resistance.

An oxidation catalyst for the treatment of exhaust gas emissions, such as the oxidation of unburned hydrocarbons (HC), and carbon monoxide (CO) and the reduction of nitrogen oxides (NOx) from a diesel engine and methods of exhaust gas treatment are disclosed. More particularly, a washcoat composition is disclosed comprising at least two washcoat layers, a first washcoat comprising palladium supported on ceria-zirconia and ceria-zirconia-alumina and a second washcoat containing one or more of platinum and palladium and one or more hydrocarbon storage components. An undercoat may also be included in the catalyst. Also disclosed are method of exhaust gas treatment and diesel exhaust gas treatment systems that include the oxidation catalyst and a downstream soot filter.

The invention relates to a high-speed resin heavy-load grinding wheel and a preparation method thereof. In the method, special material formulas of an outer grinding layer, core material and a hole core are designed separately, wherein used materials include four parts, namely a binding agent which is special for a high-performance modified high-polymer-based phenolic resin grinding wheel and prepared from phenolic resin, new phenolic resin and polysulfone resin, grinding materials such as fused zirconia alumina, alumina sintering corundum and black silicon carbide, fillers such as pyrite, cryolite and calcium carbonate (lime), and reinforcing materials such as mixed fine-particle-size grinding material, fiber, steel rings (local reinforcement) and the like; and a two-phase reinforced compound technology and structure are used to prepare the high-speed resin heavy loading grinding wheel. In the invention, the tensile strength, the folding strength and the grinding rate of the grinding wheel are greatly improved; under heavy load, the grinding range condition has wide adaptability, the linear speed is high, and the primary grinding rate is up to 1cm in thickness, so that the difficulty that the traditional grinding wheel can not be suitable for heavy load grinding of steel billets and steel material is better solved, and the need of increasing development of the steel industry is met.

The invention provides a Zr-Al-Si composite ceramic bead with high wear resistance and high strength and a processing technique thereof. The Zr-Al-Si composite ceramic bead comprises the following components by weight percent: 2-65% of ZrO2, 2-60% of Al2O3, 10-50% of SiO2 and 5% of MgO and mischmetal. The production method comprises the following steps: firstly, evenly mixing zircon sand, zirconia, aluminia, magnesia, kaoline and mischmetal, then carrying out ball milling with a wet method, drying to prepare superfine pulverulent body, rolling and molding, sintering at high temperature, and polishing to obtain the Zr-Al-Si composite ceramic beads with high wear resistance and high strength with the diameter being Phi 0.2mm to Phi 15mm. The prepared ceramic bead has flexibly adjusted density, wide application, wear resistance, stable chemical property and simple process and is easy for scale production.

A process for producing a ceria-zirconia-alumina composite oxide is disclosed. The process comprises combining a cerium (IV) compound and a zirconium (IV) compound with a slurry of aluminum oxide at a temperature greater than 40° C. to produce a reaction slurry, then contacting the reaction slurry with a precipitating agent to precipitate insoluble cerium and zirconium compounds onto the aluminum oxide and form cerium-zirconium-aluminum oxide particles, and calcining the cerium-zirconium-aluminum oxide particles to produce a ceria-zirconia-alumina composite oxide. The process to produce ceria-zirconia-alumina composite oxides provides a material having a high oxygen storage/release capacity that is suitable for a catalyst with enhanced cleaning of the exhaust gases from internal combustion engines.

The invention relates to an ordered zirconia-alumina mesoporous material and its preparation method, which belongs to the inorganic porous material and catalyst preparation field. The invention is characterized in that the material has a high and ordered mesoporous structure, its mesoporous diameter is 5.0-8.0nm, the specific surface area is 200-300m<2>/g, and the atomic ratio of Zr to Al of the material is 0.1-1.6. The synthetic method comprises the following steps: dissolving a surfactant, organic carboxylic acid and inorganic acid in an ethanol solution containing a little of deionized water according to the ratio of the synthetic material, adding zirconium source and aluminum source while stirring, continuously stirring for certain time, performing solvent volatilization on the reactant, heat treating and high temperature roasting to obtain the ordered zirconia-alumina mesoporous material. The invention has the advantages of simple process, high repetition rate and environmental protection.

The present invention produces a zirconia-alumina composite ceramic material that exhibits an excellent wear resistance and hardness and that resists chipping at the particle edges. The zirconia-alumina composite ceramic material according to the present invention has a composite structure in which zirconia particles are dispersed in alumina particles and the alumina particles are dispersed in the zirconia particles. A first phase is formed of ceria-containing zirconia particles and a second phase is formed of alumina particles. An α-alumina powder having an average particle size of at least 0.1 μm and a γ-alumina powder having an average particle size of 0.01 to 0.1 μm are used in a proportion of 85:15 to 65:35 as the mass ratio for the alumina powder for producing the alumina particles of the second phase.

The invention discloses a zirconia-alumina composite oxide carrier and a method for preparing the same. The carrier is prepared from a zirconium hydroxide-aluminum hydroxide gel serving as a raw material by using a super-solubility micelle method. Because the gel contains a surfactant and hydrocarbon components, zirconia nanoparticles and alumina nanoparticles formed after dehydration of polymerized zirconium hydroxide and aluminum hydroxide still have rod-like basic structures after shaping and roasting, and the nanoparticles are disorderly stacked into a frame structure. The carrier has large pore volume, large aperture, high porosity, large orifices on outer surface and high pore penetrability, and particularly for high molecules, the carrier can prevent a catalyst from becoming inactivated due to blockage of the orifices, contribute to increasing the deposition of impurities and prolong the operating period of the catalyst because the carrier does not have orifices similar to ink bottle-shaped orifices. The carrier can be used in catalytic reactions comprising high molecular reactants or products.

The invention discloses a fiber-reinforced resin abrasive cutting wheel, and relates to the technical field of abrasive wheels. Raw materials comprise 20# white fused alumina, 24# brown fused alumina, 30# fused zirconia alumina, green silicon carbide, liquid resin, phenolic resin powder, calcium carbonate, cryolite, iron sulfide and carbon black, and material mixing, adhesive coating of meshes, superposition pressing forming and drying are carried out to obtain the finished products. The fiber-reinforced resin abrasive cutting wheel has the advantages of being rapid in cutting, grinding and heat dissipation, capable of keeping the end face to be sharp all the time in the process of cutting grinding, and low in cost.

The invention provides a synthetic methane catalyst and a preparation method and application thereof. The catalyst is characterized in that: a zirconia or zirconia-alumina composite carrier is taken as a carrier in a catalyst co-precipitation technical process; nickel is taken as an active ingredient; rare earth elements such as La and Ce are added to enhance the activity, selectivity and stability of the catalyst, so that the selectivity of carbon monoxide is over 99 percent; and an appropriate amount of alkali metals and alkaline-earth metals such as Ca, Ba and the like are added to enhance the thermal stability, hydration resistance and anti-carbon performance of the catalyst.

The invention relates to a wheel, in particular to a rail grinding wheel, which is formed by mixing, sintering, wrapping, drying and hardening the following components in parts by weight: 70-100 parts of zirconia alumina, 5-8 parts of vulcanized iron powder, 4-8 parts of cryolite, 1-3 parts of calcium carbonate, 1-4 parts of gypsum powder and 7-10 parts of phenolic resin. In the invention, the zirconia alumina is selected as the main material of the rail grinding wheel and the vulcanized iron powder, the cryolite, the calcium carbonate, the gypsum powder and the phenolic resin for heat rejection, heat conduction and reinforcement are added on condition that the cutting force is ensured. The wheel manufactured by the invention not only has the advantages of better self-sharpening performance and grinding performance, higher cutting efficiency and low frequency of burn and crackle when a rail is grinded via the wheel, but also has the advantages of higher strength and good breakage proofness.

The invention discloses an aluminum alloy surface treatment technology. The aluminum alloy surface treatment technology comprises the following steps of (1) blasting treatment, specifically, blastingtreatment is conducted on the aluminum alloy surface by utilizing a fused zirconia alumina grinding material, so that oxide skin on the aluminum alloy surface is removed; (2) degreasing treatment, specifically, degreasing treatment is conducted in a degreasing solution; (3) anodic oxidation, specifically, an aluminum alloy base material is placed in a sulfuric acid electrolytic solution with the concentration being 15-20%, and a highly compressed carbon plate serves as a cathode and is placed in the sulfuric acid electrolytic solution to be subjected to anode-cathode electrolysis; (4) water scrubbing; (5) activation treatment; (6) dyeing treatment; and (7) hole sealing treatment. By adopting the aluminum alloy surface treatment technology, a compact protection layer can be formed to protect an aluminum alloy from being corroded and oxidated chemically.

The invention discloses a mullite combined zirconia-alumina refractory castable material, wherein aggregate consists bauxite chamotte accounting for 50 to 80 percent of the total mass of the aggregate and powder, brown alumina and sub-white corundum; the powder consists of silicon powder, rho-Al2O3 micro powder, sub-white corundum powder, alpha-Al2O3, zirconite powder, white slime, bauxite chamotte powder, high alumina cement and pure calcium aluminate cement; and the additive consists of sodium hexametaphosphate and water. The invention overcomes the defects of poor thermal shock stability and high cost in the prior art, and provides the refractory castable material with good thermal shock stability, short production flow, low cost and convenient use, and the refractory castable material can be widely applied to refractory linings of high and medium temperature furnaces.

The invention discloses a metal ceramic reinforced body which is formed by zirconia alumina, Cr-Fe powder and an organic binding agent after being sintered. A plurality of through holes are uniformly arranged on a sintered and moulded block body; the through holes are arranged on the upper end face and the lower end face, and through grooves are arranged on four side faces. According to the metal ceramic reinforced body, grooves at edge portions of two adjacent reinforced bodies form an intact through hole after different reinforced bodies are spliced together, and metal liquid is poured into the through holes, so that metallic phase can infiltrate among ceramic particles and uniformly wrap ceramic phase. Not only toughness and abrasive resistance of product ceramic are enhanced, but also heat-vibration resistance is improved.

The invention discloses a grinding wheel special for a rail grinding train and a manufacturing method of the grinding wheel, and relates to the technical field of manufacturing of grinding wheels. Thegrinding wheel special for the rail grinding train comprises, by weight, 25-35 parts of modified zirconia alumina, 35-55 parts of modified brown fused alumina, 9-15 parts of mixed resin, 3-5 parts ofaluminum oxide hollow balls, 1.5-8 parts of pyrite powder, 1-6 parts of cryolite powder, 0.5-5 parts of barium sulfate powder, 0.5-4 parts of calcium carbonate powder, 0.5-4 parts of graphite powder,3-6 parts of copper powder and 1-8 parts of fiber-reinforced materials, wherein the modified zirconia alumina and the modified brown fused alumina are fused alumina zirconia and brown fused alumina which are dried after being soaked in a KH550 alcohol solution with the concentration of 3-10wt%. The grinding wheel special for the rail grinding train is high in strength, good in tenacity, good in self sharpness and high in grinding capacity; blockage is unlikely to occur in the grinding process; a steel rail is unlikely to be burnt in the polishing process; and the steel rail has good surface quality after being polished by the grinding wheel.

The invention discloses a manufacture method of a fused cast zirconia-alumina brick. The brick is prepared from 35.69% of zircon sand, 15.3% of zirconia, 47.01% of powdered alumina and 2% of sodium carbonate. The manufacture method comprises the following steps: 1. weighing the raw materials in weight percent and then evenly mixing; 2. adding the mixed raw materials after the furnace temperature rises to 1850 DEG C, and then heating up to melt for 90 minutes; 3. keeping the temperature for 30 minutes after the furnace temperature rises to 2780-2800 DEG C, and then carrying out secondary oxygenblowing; 4. lowering the furnace temperature to 1860-1880 DEG C for casting after the oxygen blowing, and carrying out deep gas discharge and afterteeming of a casting solution in a mouldboard; 5. and annealing. The brick has obvious high temperature resistance and erosion-resistant performance when being used on a glass kiln; compared with the original zircon corundum bricks, the service life ofthe fused cast zirconia-alumina brick is prolonged by two years, thereby bringing considerable economic benefits to users. The fused cast zirconia-alumina brick receives authorization and trust fromexperts and clients of dozens of countries, such as Japan, Britain, France, India and the like.

The invention discloses a manufacturing method of an ultra-hard abrasive ceramic agglomerate and resin zirconia alumina composite grinding wheel special for grinding of a railway rail. A base body anda working layer of the grinding wheel are included; the working layer of the grinding wheel is formed by compositing of ceramic bond ultra-hard abrasive (including diamond and cubic boron nitrite) agglomerate and a resin bond zirconia alumina abrasive layer; and the pieces of ceramic bond agglomerate are distributed in resin bonds at intervals with the equal angle, and the interval angle is 10-15degrees. According to the manufactured grinding wheel, by utilizing the advantages that diamond abrasives have ultrahigh hardness and sharpness, cubic boron nitrite abrasives are low in friction coefficient, excellent in heat stability and not liable to react with ferrous metal and combining the high toughness of the resin bonds and zirconia alumina abrasives, the sharpness of the grinding wheelfor grinding the rail s improved obviously, the working life of the grinding wheel is prolonged obviously, the burn injury bluing phenomenon of the surface of the rail due to grinding is prevented effectively, and the surface quality of the ground rail is improved significantly.