1367 results about "Zirconia ceramic" patented technology

Lithium silicate glass ceramics and glasses are described which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and form a solid bond with these.

The invention provides a preparation method for a zirconia ceramic rear cover of a mobile phone. The zirconia ceramic rear cover of the mobile phone prepared in the invention has the characteristics of high strength, high toughness, high size precision, etc. The rear cover with a maximum size is applicable to a mobile phone with a size of 6 inches, and the thickness of the rear cover may be 0.15 to 0.8 mm. Moreover, the zirconia ceramic rear cover may be in a flat shape, a 2D shape, a 3D shape or other complex shapes in virtue of different shaping dies, so requirements of mobile phones of different specifications can be met. The preparation method for the zirconia ceramic rear cover of the mobile phone has high production efficiency and is suitable for large-scale production.

Zirconia-containing ceramic compositions having a c/a ratio of the zirconia lattice in the range of from about 1.005 to about 1.016. These compositions comprise a stabilizing amount up to about 10 mole % of the composition of a stabilizer component which comprises: (1) a first metal oxide selected from the group consisting of yttria, calcia, ceria, scandia, magnesia, india and mixtures thereof in an amount of from about 1.5 to about 6 mole % of the composition of; (2) a second metal oxide selected from the group consisting of lanthana, neodymia and mixtures thereof in an amount of from about 0.5 to about 4 mole % of the composition; and (3) optionally ytterbia in an amount of from about 0.5 to about 4 mole % of the composition. These compositions further comprise hafnia in an amount of from about 0.5 to about 15 mole % of the composition; and optionally tantala in an amount of from about 0.5 to about 1.5 mole % of the composition. These compositions are useful in preparing thermal barrier coatings having a balance of reduced thermal conductivity with good producibility, spallation resistance and erosion/impact resistance for an underlying substrate of articles that operate at, or are exposed to, high temperatures.

Ceramic bodies can be made by providing an initial green body of ceramic; and machining the initial green body to provide a machined green ceramic body. Embedding the initial green body in an embedding mass can be avoided. The initial green body can be bisqued, infiltrated an adjuvant such as machining wax, removing the infiltrated body, and machining it. Highly detailed ceramic products can be generated. The machined green ceramic body may be fired and/or further processed to provide a more finished ceramic body. Examples include a femoral component for a posterior stabilized knee implant, a component body for an artificial rotation device containing knee implant prosthesis a dental implant or bridge, an ice skating blade, and so forth. Zirconia ceramics are advantageously employed, for an example, Mg-TTZ.

The invention discloses a preparation method of colored zirconia ceramics, which belongs to the field of doped ceramic material preparation. The method comprises the following steps that: stabilizer and colorant are added into the suspension of zirconia powder by the mixture ratio of 850 to 980 parts of zirconia powder, 10 to 50 parts of stabilizer and 10 to 120 parts of colorant; by controlling the pH value of the solution or using various precipitant, the stabilizer and the colorant are precipitated on the surface of the zirconia powder; the solution is filtered and dried; the obtained powder is ground, screened, formed, degreased and sintered to obtain the colored zirconia ceramics. In nano-scale, the preparation method realizes the homogeneous compounding of the stabilizer, the colorant and the nano zirconia powder, can greatly reduce the volatilization of the colorant in the high-temperature sintering phase of the zirconia ceramics, has uniform sample color and good repeatability, and the colored zirconia ceramics prepared by the method can be widely applied to arts and crafts decoration, clocks and watches, mobile phone cases, jewelry and other fields.

The invention provides an ultra-wear-resistant alumina ceramic ball. The ultra-wear-resistant alumina ceramic ball comprises the following chemical components: 90-95% by weight of Al2O3, 5-8% by weight of SiO2, 0.3-0.5% by weight of CaO, 0.5-0.9% by weight of MgO, 1-2% by weight of ZrO and 0.1-0.5% by weight of La2O3/Y2O3, wherein the equivalent wear loss is less than 72 per mil. A provided preparation method comprises the following process steps of: adopting alumina powder and other mineral raw materials for burdening, refining mud, drying, calcining, synthesizing, ball-milling, granulating, forming and firing to obtain a product. According to the invention, the wear resistance of the product can achieve the standard of the alumina ceramic ball; and furthermore, the ultra-wear-resistant alumina ceramic ball has the advantages of lower cost of the raw materials, better grinding performance and high performance-price ratio of the product, is more suitable for being applied in production, and can reduce the production cost of an enterprise and improve the production efficiency of the enterprise.

This invention relates to one process method to control cargo motor hollow burst plane oxygen sensor chip, which comprises the following steps: processing flow paste on zircite ceramics powder mixed with yttrium and processing bright and complete film through flow and then cutting into relative sensor slices, heating slice and middle slices by non-contact cut machine; printing electrode inside sensor slice and heating resistance on heating slices; then using overlap heating type to integrate three slices into plane sensor load to remove organism under temperature of 1300 to 1500 degrees.

A process for preparing the zirconium oxide ceramics by doctor blading method includes calcining the square-crystal zirconium oxide powder at 600-800 deg.C for 1-3 hr, proportionally mixing it with disperser, solvent and homogenizing agent, ball grinding for 10 hr, adding plasticizer and defoaming agent, ball grinding for 10 hr, vacuum stirring for defoaming, doctor blading, drying at 60-100 deg.C for 2-3 hr, degumming by heating to 600 deg.C and holding the temp for 4 hr, and sintering at temp lower than 1540 deg.C for 2-4 hr.

The invention relates to a graphene and oxide ceramic composite material and a preparation method. Graphite oxide is used as a graphene precursor, the graphite oxide is mixed with zirconium oxide ceramic powder according to a certain proportion, and the mixture is molded and sintered so as to form the graphene and oxide ceramic composite material. The graphene and oxide ceramic composite material has a nanometer composite structure with network connections, nanometer layered graphene is uniformly distributed on a ceramic matrix to form the nanometer composite structure, the nanometer composite structure is conductive to strengthening of strength of the ceramic and endows the ceramic with the functional characteristics of semiconductor, electric conduction, heat conduction, electrochemistry, and the like, and the composite material can be used for developing sensors, electromagnetic shielding, electric heating devices, heat conduction materials, energy-storage electrodes, and the like and is used for the fields of aerospace, electronics, chemical engineering and energy sources. The graphene and oxide ceramic composite material is formed by one step in the sintering process, does not need the processes of functionalizing, mixing and the like, is simple in preparation process and is suitable for large-scale production.

The invention relates to a method for preparing black zirconia ceramics at the low temperature and belongs to the technical field of the preparation of high-temperature structural material. The method respectively uses a homogeneous precipitation method for synthesizing a nanometer coloring agent, and a coprecipitation method for synthesizing nanometer zirconia powder, and adopts Fe-Co-Ni-Mn as a coloring agent. The zirconia powder is not added with any sintering additive, only added with small amount of coloring agent and sintered at the temperature of 1150-1350 DEG C, thus obtaining the black zirconia ceramics with excellent performance and bright color. As the homogeneous precipitation method is adopted for synthesizing coloring agent powder, the monodisperse nanometer particles with uniform powder granules, narrow size distribution and high purity are obtained so that the coloring agent easily colors the particles. As the coprecipitation method is used for synthesizing zirconia powder, nanometer particles with small granularity, big superficial area and high activity are obtained, and can reduce the temperature of the solid-phase reaction, greatly reduce the sintering temperature and solve the problem that the black coloring agent oxide decomposes and volatiles at the high temperature. Simultaneously the method adopts the Fe-Co-Ni-Mn as the coloring agent, thus avoiding the poisonous function of Cr on the human body.

The invention discloses black zirconia ceramic material composition which comprises the following components in percentage by mass: 0-5% of ferric oxide, 0-5% of cobaltous oxide, 0-5% of chromic oxide, 0-5% of aluminum oxide, 0-5% of nickel oxide, 0-5% of manganese oxide, 0-5% of zinc oxide, 2-6% of yttrium oxide, 0-5% of titanium oxide, 0-5% of silicon dioxide, 0-5% of cerium oxide and the balance of zirconium oxide containing hafnium oxide. The black zirconia ceramic material composition disclosed by the invention is small in powder granularity and uniform in distribution, and black zirconia ceramic containing the black zirconia ceramic material composition is relatively good in covering power, high in blackness and relatively low in transmittance of light. Meanwhile the invention further discloses black zirconia ceramic prepared from the black zirconia ceramic material composition and a preparation method of the black zirconia ceramic.

The invention belongs to the inorganic refractory material field, and relates to a preparation method of a refractory and heat-insulating fiber board based on zirconia fiber. The preparation method mainly comprises the following steps: stable cubic phase zirconia fiber is taken as a base phase, fine zirconia powder is taken as a filler, an organic binding agent is added to prepare slurry, and the slurry is formed by vacuum filtration, dried and sintered at a high temperature to prepare the ceramic zirconia fiber board. The preparation process is simple; the prepared fiber board has the advantages of even and single component and high-temperature resistance, and the fiber board can be used in an environment of 1700 DEG C-2160 DEG C for a long time.

A reduced thermal conductivity thermal barrier coating having improved impact resistance for an underlying substrate of articles that operate at, or are exposed to, high temperatures. This coating comprises an inner high fracture toughness layer nearest to the underlying substrate and having a thickness up to about 5 mils (127 microns) sufficient to impart impact resistance to the thermal barrier coating, and comprises a zirconia-containing ceramic composition having a c/a ratio of the zirconia lattice in the range of from about 1.011 to about 1.016 and stabilized in the tetragonal phase by a stabilizing amount of a stabilizing metal oxide selected from the group consisting of yttria, calcia, ceria, scandia, magnesia, india, lanthana, gadolinia, neodymia, samaria, dysprosia, erbia, ytterbia, europia, praseodymia, and mixtures thereof. The thermal barrier coating further includes an outer thermal insulating layer adjacent to and overlaying the inner layer and comprising a ceramic thermal barrier coating material. The thermal barrier can be used to provide a thermally protected article having a substrate (e.g., metal substrate) and optionally a bond coat layer adjacent to and overlaying the substrate. The thermal barrier coating can be prepared by forming the inner high fracture toughness layer, followed by forming on the inner layer the outer thermal insulating layer.

The invention, belonging to the technical field of zirconia ceramic, discloses a zirconia ceramic and a preparation method thereof. The ceramic comprises matrix, sintering aid, neodymium oxide and additive, wherein, the matrix is yttria stabilized zirconia, the additive is selected from one or more of zinc oxide, barium carbonate and calcium fluoride, and the diffraction peak of the XRD appears when the 2 theta is 34.8-36.2 degrees. The zirconia ceramic has stable and beautiful purple. The preparation method comprises the following steps: adding neodymium oxide particles in a diethanolamine solution for soaking, then carrying out solid-liquid separation; carrying out ball mill mixing of the matrix, processed neodymium oxide particles, sintering aid and additive, then carrying out die forming and high temperature sintering. The preparation method provided by the present invention is simple and easy, and is suitable for large-scale industrial production.

The invention discloses an electrode sealing method in a hydrogen furnace device for polysilicon production and relates to an electrode device in the hydrogen furnace for polysilicon production. By connecting cooling circulating water in the electrode and adopting special zirconia ceramics, flexible graphite, fluorubber O-shaped sealing rings and various materials, the problems of high-temperature resistance, insulation and sealing between the electrode and a chassis are solved, thereby improving the reliability of the hydrogen furnace device, ensuring the safe operation of the hydrogen furnace device and improving the productive efficiency of the hydrogen furnace device.

The invention provides a zirconium oxide ceramic cylinder jacket material, which comprises 65-75wt% of zirconium oxide, 3-6wt% of cerium oxide, 1-3wt% of yttrium oxide, 20-30wt% of aluminum oxide, and 0.5-2wt% of titanium dioxide. The invention also provides a preparation method for the zirconium oxide ceramic cylinder jacket material. The zirconium oxide ceramic cylinder jacket material provided by the present invention has higher strength, toughness and thermal shock resistance, and is able to resist wear, corrosion and high temperature. inner liner of slurry pumping cylinder sleeve prepared from the zirconium oxide ceramic cylinder jacket material has the following advantages that (1) service life is long, performance-price ratio is high, thereby reducing equipment cost consumption, greatly reducing frequency of shutdown to maintain cylinder jacket, reducing economical loss due to stop production and maintenance, and lightening labor intensity of workers; and (2) wearing for piston in the cylinder jacket is reduced, service life of the piston is prolonged, and piston cost is saved.

The invention relates to a preparation method of tooth color imitating dental tetragonal polycrystalline zirconia ceramics, which specifically comprises the following steps: taking a 3Y-TZP ceramic ingot as the raw material, taking rare earth oxide and transition element oxide as the colorant, adding the colorant and absolute ethyl alcohol into 3Y-TZP, ball milling, adding the 3Y-TZP, the absolute ethyl alcohol and agate ball milling beads into an agate ball milling pot by the mass ratio of 1:1:1, then drying, dry pressing and forming, isopressing and forming; and sintering at normal pressure, cutting and forming to obtain the tooth color imitating dental tetragonal polycrystalline zirconia ceramics. The preparation method of tooth color imitating dental tetragonal polycrystalline zirconia ceramics has the advantages that the chromatic values of 6 types of zirconia ceramics are within the range of natural tooth color, the color stability is good, the mechanical properties are excellent, and a constructed two-stage sintering process is beneficial to industrialized popularization, expands the adaptation disease scope thereof in dental clinical medicine and provides bases for the localization thereof.

The invention discloses a multiple-oxide-doped gradient-color zirconia dental prosthesis and a preparation method thereof. The multiple-oxide-doped gradient-color zirconia dental prosthesis is formed by mixing and overlaying more than one of dental zirconia porcelain mixed powder A, B and C with powder D on each porcelain layer according to different mass fractions. The three mixed powder is obtained by respectively doping ErO2, CeO2 and Fe2O3 with zirconia porcelain raw materials. The powder D refers to undoped zirconia porcelain raw materials. The preparation method includes mixed powder preparation, pre-dry-pressing, dry pressing, cold isostatic pressure forming, pre-sintering, blank engraving and final sintering. The preparation method is simple and easy to operate, the obtained prosthesis is wide in color regulation range and uniform in transition and has similar distribution characteristics to a natural tooth, and attractiveness of the zirconia all-porcelain prosthesis is improved. In addition, through the dry pressing process added during forming, uniformity of a powder overlaying and mixing stage is guaranteed and sintering body volume density and strength are improved.

The invention discloses a manufacturing method of black zirconia ceramics which comprises, processing zirconium oxide ceramic powder into work piece blank, subjecting the obtained zirconium oxide to de-waxing, degreasing or low-temperature biscuit firing treatment with no protective atmosphere, then subjecting the pretreated zirconium oxide plain blank work piece to high-sintering under vacuum condition, or filling argon, hydrogen into the evacuated furnace, and conducting high-sintering in protective atmosphere.