2578 results about "Zirconium dioxide" patented technology

The invention provides a high selectivity catalyst used for catalyzing and completely oxidizing formaldehyde with low concentration at room temperature. The catalyst can catalyze formaldehyde completely so as to lead the formaldehyde to be converted into carbon dioxide and water at room temperature. In addition, the conversion rate of formaldehyde remains 100% within a long period of time, without complex auxiliary facilities such as light source, a heating oven and the like, and external conditions. The catalyst comprises three parts which are inorganic oxide carrier, noble metal component and auxiliary ingredient. Porous inorganic oxide carrier is one of cerium dioxide, zirconium dioxide, titanium dioxide, aluminium sesquioxide, tin dioxide, silicon dioxide, lanthanum sesquioxide, magnesium oxide and zinc oxide or the mixture thereof or composite oxide thereof, zeolite, sepiolite and porous carbon materials. The noble metal component of the catalyst is at least one of platinum, rhodium, palladium, gold and silver. The auxiliary ingredient is at least one of the alkali metals of lithium, sodium, kalium, rubidium and cesium. The loading of the noble metal component used in the catalyst of the invention is 0.1 to 10% according to weight converter of metal elements and the selective preference is 0.3 to 2%. The loading of the auxiliary ingredient is 0.2 to 30% according to weight converter of metal elements and the selective preference is 1 to 10%. When the loading of the auxiliary ingredient is lower than 0.2% or higher than 30%, the activity of the catalyst for catalyzing and oxidizing formaldehyde at room temperature is decreased remarkably.

The invention is directed to veneer ceramics for dental restorations of framework ceramics comprising yttrium-stabilized zirconium dioxide. It is the object of the invention to make possible a translucent veneer ceramic which has high flexural strength as well as excellent adhesion to the framework ceramic of yttrium-stabilized zirconium dioxide. According to the invention, this object is met in a veneer ceramic for dental restorations made of yttrium-stabilized zirconium dioxide which is produced from the following components:

The invention relates to a compound oxide carrier and a preparation method, and belongs to the filed of catalyst preparation, wherein the compound oxide carrier is prepared by compounding gamma-aluminum oxide, silicon dioxide and zirconium dioxide. The method comprises the following steps: co-precipitating precursors of the aluminum oxide, the silicon dioxide and the zirconium dioxide with alkali solution, adding surfactant into the mixture to improve the pore structure and acidity and alkaline, then washing, filtering and roasting the obtained sediment at high temperature to obtain compound oxide powder, and finally extruding and molding the compound oxide powder to obtain the carrier. The pore structure and the acidity and the alkaline of the obtained carrier have wide adjustable ranges, the specific surface of the carrier is 200 to 500 m<2> per gram, the pore volume thereof is 0.4 to 1.2 milliliters per gram, and the total acid amount of NH3-TPD is 0.2 to 0.8mmol/g. The carrier prepared by the method is suitable for preparing hydrogenation catalysts of petroleum fractions.

The invention discloses a bimetal methanation catalyst for the removal of micro carbon monoxide from a hydrogen-rich gas and a preparation method thereof. The bimetal methanation catalyst contains active components, namely nickel oxide and ferric oxide, loaded on an oxide carrier and an assistant, wherein the assistant is at least one element selected from the main group I, the main group II, the subgroup I, the subgroup III, the subgroup VI and the subgroup VIII of the periodic table, and the oxide carrier is alumina, titanium dioxide, zirconium dioxide and silicon dioxide or a mixture thereof. The catalyst of the invention can allow the micro carbon monoxide to be removed from the hydrogen-rich gas at a relatively low temperature and has the advantages of low load, high activity, relatively low cost and wide application prospect.

The invention provides a fluid cement for medical use for bone reconstruction, in particular for filling the vertebral body, and a binary composition which is intended for the preparation of such a cement. The invention also provides a device for conditioning the binary composition, and a method of preparing a bone cement from a binary composition. The fluid cement according to the invention comprises: a) approximately 60% to 85% by weight of a polymer comprising a polymethylmethacrylate and a methylmethacrylate monomer and b) approximately from 15 to 40% by weight of a radio-opaque composition. Preferably, the radio-opaque composition comprises a radio-opacifier, such as barium sulfate and zirconium dioxide, in a mixture with a calcium phosphate, for example apatite hydroxide.

The invention discloses high-toughness enamel glaze. The enamel glaze is prepared from the following components in parts by weight: 40-50 parts of silicon dioxide, 15-25 parts of titanium dioxide, 5-15 parts of potassium oxide, 10-20 parts of sodium oxide, 1-5 parts of lithium oxide, 2-4 parts of calcium fluoride, 6-12 parts of vanadium pentoxide, 1-3 parts of tungsten carbide and 5-10 parts of aluminum oxide and zirconium dioxide. According to the enamel glaze, by means of the composition, the toughness of the enamel glaze can be greatly improved, meanwhile, the defect that ceramic cracks arecaused due to collision can be overcome, and therefore, the enamel glaze has a wide application prospect.

The invention relates to a sulfur-tolerant methanation catalyst and its preparation method, and relates to a sulfur-tolerant methanation catalyst which can be used under a wide operation condition particularly at high temperature and its preparation method, and the sulfur-tolerant methanation catalyst contains a carrier and an active component loaded on the carrier. The carrier is selected from alumina, silica, zirconium dioxide, active carbon or molecular sieve, the active component comprises a molybdenum oxide taken as a main active component, a cobalt oxide taken as a first auxiliary agent; and a zirconium oxide, a cerium oxide or a lanthanum oxide, or a mixture composed of at least two above oxides which is taken as a second auxiliary agent. The invention also discloses the preparation method of the sulfur-tolerant methanation catalyst which is composed of a dipping step, a drying step and a calcining step.

The invention relates to a fiber-enhanced Al2O3-SiO2 aerogel efficient heat isolation composite material and a preparation method thereof. The composite material is prepared from the following ingredients in percentage by mass: 25 percent to 90 percent of Al2O3-SiO2 aerogel base bodies, 5 percent to 45 percent of enhanced fiber and 5 percent to 30 percent of light-shielding agents, wherein the light shielding agents are zirconium dioxide or zirconium silicate. The highest use temperature of the prepared material can reach 1200 DEG C; good heat insulation performance is realized in the range of 25 DEG C to 1200 DEG C.

The invention relates to a kind of hydroxyl apatite - zirconia compound biology ceramic material and its producing method, belonging to biology medical material producing technological field. The invention makes zirconia as substance central layer, on its upper and lower surfaces, respectively spread mix middle layer of zirconia and hydroxyl apatite mixed as per different proportion, on the most outside spread a surface layer of pure hydroxyl apatite, to form a kind of gradient nappe structure; in steel mould, at pressure of 10 - 30 MPa, dry press to molding, then at high temperature of 1500 - 1600 Deg. C, sinter without pressure, then can get hydroxyl apatite - zirconia compound biology ceramic material. The compound material produced by the method of the invention, its anti-bending strength is 900 - 1100 MPa, its fracture toughness (KIC) is 7 - 10 MPaíñm1/2, its roughness is 0.5 - 5.0 micron; the compound material has good biology compatibility, so can meet the requirement of load bearing planting body of different parts of human body.

The invention provides a novel bactericide, which consists of tourmaline, transition metal and/or oxide thereof, and a carrier. The tourmaline is powder of (Na, Ca) (Mg, Fe)3B3Al6Si6(O, OH, F)31, and accounts for 5 to 80 percent by weight of the bactericide; the transition metal and/or the oxide thereof by the weight of the metal elements account for 0.1 to 50 percent of the weight of the bactericide; and the carrier is one or a mixture of titanium dioxide, silicon dioxide, aluminum oxide, zeolite, zinc oxide, ferric oxide, zirconium dioxide, sepiolite, porous ceramics and active carbon. The bactericide does not need to add a power supply or a light source but can kill microbes such as bacteria, virus and mildew in the air, has the characteristics of small resistance, high sterilization speed and no pollution, and can be widely applied to air sterilization for an air purifier, an air conditioner and a concentrated air-conditioning ventilation system.

An article of manufacture and a process for making the article by generating corrosion-, heat- and abrasion-resistant ceramic coatings comprising titanium and/or zirconium dioxide using direct and alternating current on anodes comprising aluminum and/or titanium. Optionally, the article is coated with additional layers, such as paint, after deposition of the ceramic coating.

By using a catalyst formed by carrying a noble metal such as platinum, palladium, rhodium, iridium, or ruthenium, and an element from the 2B and 3B families such as zinc, gallium, or indium, on a basic metal oxide carrier, such as cerium dioxide or zirconium dioxide, or a catalyst formed by carrying similar noble metal and an alkali metal, such as sodium, potassium, or cesium, or an alkaline earth metal such as magnesium, calcium, or barium on a similar carrier, methanol can be water vapor reformed with a high efficiency while the carbon monoxide concentration in the obtained hydrogen-containing gas can be simultaneously kept at a low level.

The invention relates to a nanoscale heat insulating material, comprising the following components in weight percent: 5-95% of nanoscale silicon dioxide powder, 5-50% of nanoscale or micro-sized zirconium dioxide powder or zirconium silicate powder and/or silicon carbide powder, 3-15% of reinforced fibre and adding the solvent to 100%. The invention is characterized by easily-obtained raw materials, simple production, low cost and the like, no need of special device; as for the prepared nanoscale heat insulating material, the density is 100-500Kg/m3, the heat conduction coefficient is 0.030-0.055W/mK at 800 DEG C and is much lower than that of the ceramic fibre with the heat conduction coefficient being 0.12-0.20W/mK at 800 DEG C, thus being an excellent nanoscale heat insulating material with broad application prospect and being widely applied to each aspect of heat insulating and energy saving fields of high temperature heat insulation, low temperature heat insulation, cold insulation and the like.

The invention relates to a ceramic wave-transmitting material and preparing method thereof, wherein the material is prepared from sub-micron high purity silicon nitride, boron nitride, zirconium dioxide and nano silica flour through batching, homogeneously mixing by means of supersonic wave and chemical dispersion method, forming through cold isostatic compaction method, and high-sintering in nitrogen atmosphere.

The invention discloses a scrubbable attapulgite photocatalyst spraying liquid. The main points of the technical scheme are that ingredients consist of high-viscosity attapulgite clay, acidified attapulgite clay, nano-titanium dioxide, white carbon black, nano-silver-loaded antibacterial powder, nano-magnesium oxide, nano-zirconium dioxide, nano-aluminium oxide, nano-zinc oxide, polyvinyl alcohol, polyethylene glycol, polydimethylsiloxane and water. The scrubbable attapulgite photocatalyst spraying liquid is prepared by stirring, dispersing, emulsifying and grinding the ingredients first, and then, dispersing again, homogenizing, grinding, and canning. The scrubbable attapulgite photocatalyst spraying liquid is suitable for being sprayed on the surface of a building or a decorative material, can continuously adsorb and degrade pollutants, such as formaldehyde, ammonia and benzene, under the irradiation of light, and has extremely good functions of sterilizing, deodorizing, preventing mould, preventing pollution, self-cleaning and purifying air. A thin film which is formed by spraying the scrubbable attapulgite photocatalyst spraying liquid on the surface of the building or the decorative material can present a saturated state after being used for a long time, and can be scrubbed with a cleaning rag.

The invention discloses a method for manufacturing a high thermal shock ultra-temperature zirconium dioxide product at low temperature. The manufacturing method is to use electric-melting high-purity zirconium dioxide fine powder with granularity less than 47mum (using one of Y2O3, (CaO+Y2O3), (CaO+MgO) and (MgO+Y2O3) as a stabilizing agent) as a substrate, Y2O3 fine powder with granularity less than 5mum as an additive, one of ZrO2 collosol and ZrOCl solution or combination of one of lignosulphonate and phenolic resin with the ZrOCl solution as a bonding agent to fire the product after milling, forming and drying at a temperature ranging from 1,630 to 1,700 DEG C. Heavy and light high purity zirconium dioxide products which are manufactured by the method have high thermal shock stability, high compressive strength, good high temperature stability, strong impermeability and erosion resistance, good thermal insulation effect and the like, and can be used in a high temperature environment over 2,200 DEG C for long time; and the manufacturing method has the advantages of simple manufacturing process, easy industrial popularization and application and the like.

The invention discloses a basic glaze for ink jet printing, a preparation method of the basic glaze, and a ceramic tile. The basic glaze for the ink jet printing comprises the following chemical components by weight percentage: 2.0-3.0% of igloss, 13.0-17.0% of aluminium oxide, 64.0-69.0% of silicon dioxide, 0.05-0.2% of ferric oxide, 0.3-0.9% of calcium oxide, 3.0-6.0% of magnesium oxide, 1.4-2.0% of potassium oxide, 1.4-2.0% of sodium oxide, 0.03-0.10% of titanium oxide, 5.0-10.0% of zirconium dioxide and hafnium oxide, 0.01-0.2% of lithium oxide, and 0.1-2.0% of zinc oxide. The basic glaze for the ink jet printing is free from such defects as deformation, bubbles, pin holes, sewage suction and poor color when an ink jet printing technique is used, and a fabricated product has good color, the surface of a glazed tile is fine and smooth, and the product quality and effect can be improved.