302 results about "Alumina zirconia" patented technology

Corundum-zirconia abrasive grains containing more than 50 wt % of an alumina-zirconia eutectic mixture. The grains contain 0.3 to 3% nitrogen, and more than 75% of the zirconia crystals are cubic in shape. The abrasive grains are of particular use for making grinding wheels, abrasive fabrics and papers, polishing compounds and sprayed abrasives.

A metal oxide nanoporous material comprises two or more kinds of first metal oxides selected from the group consisting of alumina, zirconia, titania, iron oxide, rare-earth oxides, alkali metal oxides and alkaline-earth metal oxides. The metal oxide nanoporous material has nanopores, each with a diameter of 10 nm or smaller, in which the metal oxides are dispersed homogeneously in the wall forming the nanopores.

This invention relates to a saw bit belonging to mechanical working field, which comprises metal base being alloy steel or carbon steel, with Phi8-Phi10mm radiating holes equispaced on its surface; Carcass including alumina, zircite, quartz, tungsten carbide, zirconium diboride, molybdenum disilicide; common abradant including brown fused alumina, carbofrax, green silicon carbide, cubic carbofrax, boron carbide; superhard abradant including diamond and cubic boron nitride. The produce process includes mixing carcass flour, working layered material batching-mixing process, welding layered material batching-mixing process, koldflo, thermal pressing-sintering formation, arc milling, welding, dressing and making edge. The invention has improved working efficiency, lowered product cost, and is suitable for cutting metal tube, plate such as this materials.

The invention relates to a resin rough grinding wheel and a preparation method thereof. The resin rough grinding wheel comprises a grinding body and reinforcing meshes, wherein the reinforcing meshes are arranged inside the grinding body to enhance the revolving strength of the grinding body. The grinding body is composed of 115-150 parts of grinding materials, 5-15 parts of liquid phenolic resin, 25-45 parts of phenolic resin powder and 15-35 parts of filling, wherein the grinding materials comprise 30-40 parts of microcrystal corundum, 80-100 parts of fused alumina zirconia and 5-10 parts of garnets, the filling is composed of 9-21 parts of pyrite, 1-3 parts of cryolite, 1-3 parts of ferric oxide, 1-3 parts of quick lime and 3-5 parts of fluorite. The resin rough grinding wheel is prepared through the steps of preparation, mixing, sifting, shaping, hardening, testing, packaging and storing, has high strength, good abrasive resistance and self-sharpening performance, high grinding efficiency, good roughness and low workpiece burning possibility; meanwhile, the surface of the grinding wheel is not easy to block and has good breathability, good tenacity and high security performance.

A layered composition which can be used in various processes has been developed. The composition comprises an inner core such as a cordierite core and an outer layer comprising a refractory inorganic oxide, a fibrous component and an inorganic binder. The refractory inorganic oxide layer can be alumina, zirconia, titania, etc. while the fibrous component can be titania fibers, silica fibers, carbon fibers, etc. The inorganic oxide binder can be alumina, silica, zirconia, etc. The layer can also contain catalytic metals such as gold and platinum plus other modifiers. The layered composition is prepared by coating the inner core with a slurry comprising the refractory inorganic oxide, fibrous component, an inorganic binder precursor and an organic binding agent such as polyvinyl alcohol. The composition can be used in various hydrocarbon conversion processes.

A solid oxide fuel cell device incorporates a sealing material resistant to hydrogen gas permeation at a sealing temperature in the intermediate temperature range of 600° C.-800° C., the seal having a CTE in the 100×10⁻⁷/° C. to 120×10⁻⁷/° C., wherein the sealing material comprises in weight %, of: (i) a 80 to 95 wt % of glass frit, the glass frit itself having a composition in mole percent of: SiO₂ 70-85%; Al₂O₃ 0-5%; Na₂O₃ 0-8%; K₂O 10-25%; ZnO 0-10%; ZrO₂ 0-6%; MgO 0-7%; TiO₂ 0-2%; and (ii) and 5 wt % to 25 wt % of addition comprising at least one of: alumina, zirconia or leucite.

Spacerless artificial disc replacements (ADR) are disclosed. One preferred embodiment includes two saddle-shaped components to facilitate more normal spinal flexion, extension, and lateral bending while limit axial rotation, thereby protecting the facet joints and the annulus fibrosus (AF). Either or both of the superior and inferior components are made of a hard material such as chrome cobalt, titanium, or a ceramic including alumina, zirconia, or calcium phosphate. The articulating surfaces of the ADR are also preferably highly polished to reduce friction between the components. Metals, alloys or other materials with shape-memory characteristics may also prove beneficial.

A cosmetic skin care composition that can provide the consumer-desired properties of appearance of natural skin radiance, containing solid single-crystal flat platy particles having an Index of Refraction of about 1.8 to about 2.2, the composition having less than 20% Opacity, preferably less than 10% Opacity. The platy particles preferably include bismuth oxy-chloride, aluminum oxide, zirconium oxide, boron nitride, solid solutions and mixtures thereof. A method of imparting radiant skin appearance, especially in the facial area, by applying to the skin the inventive composition is also disclosed.

The invention relates to a preparation method for alumina-zirconia ceramic fiber. The method comprises the following steps: utilizing aluminium isopropoxide, formic acid, zirconium acetate and/or additive to prepare spinnable colloidal sol precursor, adopting a centrifugal fiber forming technology to prepare gel fibre, and then calcining to obtain the alumina-zirconia ceramic fiber with the diameter of 1 to 8 micrometers. The colloidal sol prepared by the invention is stable in framework, cheap in used raw materials, mild in fiber forming condition and simple in preparation process. The calcined ceramic fiber is good in flexibility and low in heat conductivity coefficient, and can be used for high temperature thermal insulation material.

The invention discloses a high-temperature protective coating for a high-carbon steel billet. The coating comprises a dry powder material and an adhesive. The dry powder material is prepared from the following components in parts by weight: 30-50 parts of corundum carbon-free waste brick materials, 10-12 parts of electro-fused mullite, 25-30 parts of fused alumina zirconia waste brick materials, 8-10 parts of silicon carbide, 3-6 parts of soft clay, 3-6 parts of kyanite and 2-4 parts of sodium polyacrylate. The adhesive is prepared from a solid compound adhesive and a liquid compound adhesive. The dosage of the solid compound adhesive is 3-6% of the total weight of the dry powder material and the dosage of the liquid compound adhesive is 2-4% of the total weight of the dry powder material. The protective coating can be used for directly spraying the hot state billet with the surface temperature of 400-1100 DEG C, and not only has the double functions of preventing oxidization and resisting decarburization, but also has the self-repairing ability, so that the loss of iron scale and the thickness of a decarburized layer in the heating process of the high-carbon steel billet are remarkably reduced, the surface quality of the billet is improved. The production efficiency of a rolling mill is improved, and the production cost is lowered.

The invention relates to an alumina-zirconia composite carrier and a preparation method thereof. The carrier comprises the following components in percentage by mass: 1 to 95 percent of alumina and 5 to 99 percent of zirconia; the carrier has the following physical properties that: the bulk density is 0.8 to 1.1g/ml, the pore volume is 0.3 to 0.6ml/g, the specific surface area is 5 to 60m<2>/g, and the average pore size is 80 to 350nm, 100 to 250nm preferably; and the carrier has two peaks when the pore size is 90 to 140nm and 250 to 500nm. The invention also discloses the preparation method of the carrier, and a carrier-containing hydrogenation catalyst.

The invention discloses a gate valve sliding plate brick for slag retaining of a converter and a preparation method thereof. Based on the total amount of 100 percent, the brick comprises the following components in percentage by weight: 20 to 30 percent of tabular corundum particles, 30 to 45 percent of zirconia corundum particles, 5 to 10 percent of tabular corundum fine powder, 5 to 10 percent of zirconia corundum fine powder, 5 to 20 percent of white corundum fine powder, 0 to 5 percent of alpha-Al2O3, 1 to 4 percent of flake graphite, 0 to 2 percent of expanded graphite, 0 to 5 percent of aluminum metal powder, 0 to 5 percent of silicon metal powder, 0 to 3 percent of boron carbide and 4 to 6 percent of additional phenolic resin. According to the gate valve sliding plate brick and the preparation method thereof, the service life of the brick on 100-ton converters is prolonged from original 10 to 12 converters to 13 to 15 converters, and is basically equivalent to that of a zirconia plate embedded gate valve sliding plate; compared with a conventional alumina-zirconia-carbon gate valve sliding plate, a sliding plate for which the brick is used has the advantages that transverse cracking and fracturing phenomena of the sliding plate are remarkably reduced, and the thermal shock resistance is obviously improved, the surface of the plate is smooth, the erosion pore expanding rate is low, the number of continuous using times is increased, and the safety is improved.

The invention relates to an isopropanol-based coating for lost foam casting steel and a production method thereof. The coating uses alumina-zirconia powder as a fireproof material, uses PVB (Polyvinyl Butyral) and phenol formaldehyde resin as adhesives, uses organic bentonite as a suspending agent, and takes suitable quantity of isopropanol as a material coating carrier. The production method comprises the following steps of firstly dissolving the PVB and the phenol formaldehyde resin in an alcohol; sufficiently mixing the mixed solution to form a colloida solution; subsequently mixing the organic bentonite and the alumina-zironia powder uniformly; finally conducting sufficient ball-grinding and mixing to the mixed aggregates, adhesive solutions and isopropanol for 45-70 minutes at the speed of 1450r/min, thus preparing the isopropanol-based coating for lost foam casting steel. The coating has low manufacturing cost, simple technological process and high casting quality, and is particularly suitable for roughcast production of complex and large cast steel.

The invention discloses a heavy-load grinding wheel. The heavy-load grinding wheel comprises the following components in percentage by weight: sintered corundum, fused alumina zirconia, brown fused alumina, a coupler, phenol-formaldehyde resin powder, elastic polyvinyl chloride powder, cryolite powder, light calcium carbonate micro powder and impregnation chopped glass fibers and is prepared by a hot pressing molding process. The elastic polyvinyl chloride resin powder is mixed in a grinding material, so that the tenacity and the shock absorbing effect of the grinding wheel are improved, and the probability of sheet blasting is greatly reduced. On the other hand, elastic polyvinyl chloride has excellent flame resistance, so that burning of grinding heat to phenol-formaldehyde resin is reduced, the bonding ability of the phenol-formaldehyde resin to the grinding material is improved, and the grinding ratio of the grinding wheel is improved. The coupler is used for modifying the surface of the phenol-formaldehyde resin, so that the interface bonding force between the organic resin and the inorganic grinding material is stronger, and the rotation strength of the grinding wheel is improved. Furthermore, due to the adoption of the impregnation chopped glass fibers, the dissolving ability of the phenol-formaldehyde resin is favorably enhanced, and the rotation strength of the grinding wheel is further improved.

The invention discloses a method for preparing a 3D rapid prototyping alumina-zirconia-carbon ceramic powder material. The method is characterized by comprising the following steps: firstly, pre-treating alumina-zirconia-carbon ceramic powder with N-(beta-aminoethyl)-gamma-amino propyl trimethoxy silane and stearic acid to obtain pre-treated alumina-zirconia-carbon ceramic powder; then, adding the following components in percentage by mass: 60-70 percent of trichloroethane and 2-5 percent of bisphenol A polycarbonate into a reactor, stirring and dissolving, and adding 26-36 percent of the pre-treated alumina-zirconia-carbon ceramic powder, uniformly stirring and mixing, intensively stirring at constant temperature of 50+/-5 DEG C, refluxing to react for 5-7 hours, and drying by spraying to obtain the rapid prototyping alumina-zirconia-carbon ceramic powder material. The material does not need to spray adhesive, can be directly molded in a molding temperature range of 220-230 DEG C, has the advantages of simple preparation process, easily controlled condition and low production cost, and is easy for industrial production.

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 relates to a sandwich structure bulletproof ceramic sheet. The bulletproof ceramic sheet is characterized in that its upper surface layer and lower surface layer are composed of 85-95% of Al2O3 and 5-15% of ZrO2 by mass, and a central layer consists of 75-85% of Al2O3 and 15-25% of ZrO2 by mass; the surface layers and the central layer of the sintered sandwich structure bulletproof ceramic sheet are in a thickness ratio of 1:5-15; the surface of the bulletproof ceramic sheet is in a regular hexagon or square shape, the bulletproof ceramic sheet has a sandwich layer structure in the thickness direction, for the sintered regular hexagon, the length of its diagonal lines is 40-60mm, and the thickness is 7-12mm, or for the square, the side length is 30-60mm, and the thickness is 7-12mm; and the sintered bulletproof ceramic sheet has a relative density of 98.5-99.5%, impact toughness of 1-1.4J, bending strength of 500-600MPa, and fracture toughness of 8-11 MPa.m<1/2>. The sandwich structure bulletproof ceramic sheet can be used as a hard bulletproof material of human body and armor. By introducing the sandwich structure to alumina-zirconia composite ceramics, certain component difference between adjacent layers is ensured, so that the ceramic sheet can have excellent impact resistance. And a three-step forming method is employed to achieve densification of the ceramic sheet in an atmospheric environment at a low temperature.

Catalysts and methods useful for the production of olefins from alkanes via oxidative dehydrogenation (ODH) comprise at least one base metal and copper with an optional promoter. The catalyst preferably comprises a base metal and a copper-modified Groups 8, 9, or 10 metal on a support comprising alumina, zirconia, or mixtures thereof. Copper is preferably present in an amount of from about 0.1 to about 1.0 percent by weight of the total catalyst weight. The base metal preferably comprises manganese, chromium, gold, their corresponding oxides, or combinations thereof. The optional promoter preferably comprises platinum, palladium, iridium, rhodium, ruthenium, or any combinations thereof