Abstract: A composition with a Mohs hardness of at least 6.0, wherein said composition contains at least 30 weight percent of spinel crystals, at least 10 weight percent of glass, and less than 10 weight percent of ferrometalsilicate. The composition also contains particles with a particle size distribution such that at least about 95 weight percent of such particles are smaller than about 2.0 millimeters; at least about 70 weight percent of such particles have a particle shape that is either the blocky particle shape or the pyramidal particle shape. At least 20 weight percent of the spinel crystals are equiaxed spinel crystals; the weight/weight ratio of said spinel crystals to said glass is at least 1.2/1; the composition has a melting point in excess of 1440 degrees Celsius; and the composition has a density of from about 3.0 to about 4.5.

Abstract: The invention relates to polycrystalline corundum fibers substantially consisting of corundum and an oxide of the elements of the main groups I or II of the periodic table. The crystallites of said corundum fibers have the following grain size distribution: 0 to 0.15 micrometers (34%), 0.15 to 0.29 micrometers (55%) and 0.29 to 0.43 micrometers (11%). Said corundum fibers are produced by mixing nuclei and an oxide former of the elements of the main groups I or II of the periodic table with an aluminium chlorohydrate, by adding a water-soluble polymer, then by spinning fibers from said mixture and by calcining said fibers at temperatures above 1100° C.

Abstract: The invention relates to a fired refractory ceramic product. According to the invention, this generic term encompasses both shaped and unshaped products. Shaped products are ones which have a defined shape so that they can be manufactured in finished form on the premises of the manufacturer. Shaped products include: bricks, nozzles, tubes, stoppers, plates, etc. The term unshaped products includes ones which are usually produced by the user from a corresponding composition. They include bases for furnaces which are cast from a composition but also repair compositions, etc.

Abstract: The invention relates to alkaline-earth or rare-earth metal aluminate precursor compounds, to their method of preparation and to their use in particular as phosphor precursors. These alkaline-earth or rare-earth metal aluminate precursor compounds are essentially crystallized in the form of a transition alumina and in the form of substantially spherical and chemically homogeneous particles including pores whose mean diameter is of at least 10 nm.

Abstract: Structures and methods for the fabrication of ceramic nanostructures. Structures include metal particles, preferably comprising copper, disposed on a ceramic substrate. The structures are heated, preferably in the presence of microwaves, to a temperature that softens the metal particles and preferably forms a pool of molten ceramic under the softened metal particle. A nano-generator is created wherein ceramic material diffuses through the molten particle and forms ceramic nanostructures on a polar site of the metal particle. The nanostructures may comprise silica, alumina, titania, or compounds or mixtures thereof.

Abstract: A heat-insulating material has a first phase with the stoichiometric composition of 0.1 to 10 mol-% M12O3, 0.1 to 10 mol-% Li2O, and as the remainder M22O3 with possible impurities. M1 is selected from the elements lanthanum, neodymium, gadolinium, or a mixture thereof, and M2 is selected from the elements aluminum, gallium, iron, or a mixture thereof. The first phase is present in a magnetoplumbite structure.

Abstract: The disclosure relates to metal oxide powders with a bimodal particle size distribution, to ceramics that can be made from these metal oxide powders, especially milling ceramics for use in dental technology, to a method for the production of the metal oxide powders and of the ceramics, to the use of nanoscale metal oxide powders for the production of the metal oxide powders and of the ceramics as well as to dental ceramic products.

Abstract: A composition includes particles of an inorganic component A and particles of an inorganic component B which together can form a eutectic system and react at least partly with one another at a sintering temperature, resulting in formation of at least one ternary chemical compound of the spinel type. The composition can be applied to high-temperature-stable ceramic layers, coatings and shaped bodies and also their production, their uses and compositions for producing them.

Abstract: A spark plug insulator having high dielectric strength, high density, and an optical property that allows the passage of light.

Abstract: A sintered body for a magnetic head slider, which can reduce differences in level of an air bearing surface while yielding a high strength, a magnetic head slider using the same, and a method of manufacturing a sintered body for a magnetic head slider are provided. The sintered body of the present invention is a sintered body comprising alumina crystal grains and a thin film containing carbon provided at a grain boundary between the alumina crystal grains, whereas the alumina crystal grains have an average particle size of 0.05 to 0.5 ?m.

Abstract: The disclosed invention relates to a reinforced ceramic refractory made from an as-batched composition comprising alumina; a rare earth oxide; an oxide of a transition metal comprising Sc, Zn, Ga, Y, Cd, In, Sn, Tl or a mixture of two or more thereof; and chopped ceramic fibers containing nanofibrils; the refractory exhibiting a modulus of rupture measured at 2500° F. (1371° C.) of at least about 2500 psi, as determined by the test method ASTM C583. A process for making the reinforced ceramic refractory is disclosed.

Abstract: Densified zinc oxide ceramics can be obtained so that transparent electrodes with good characteristics can be obtained using the ceramics as a sputtering target. This manufacturing method is used to manufacture the zinc oxide ceramics doped with Al in ZnO. This method comprises, calcination powder production process by which calcination powder is produced after blending Al2O3 powder and a 1st ZnO powder and by calcinating them, and sintering process by which said zinc oxide ceramics are manufactured after sintering formed body composed of powder before the sintering which is made by blending said calcination powder and a 2nd ZnO powder. Here, the ceramics are manufactured not by sintering a formed body composed of Al2O3 powder and ZnO powder, but by sintering the formed body composed of the calcination powder containing ZnAl2O4 phase and ZnO powder.

Abstract: A ceramic material (20, 20A, 20B, 20C, 20C?, 20D, 20E, 20E1, 20E2, 20E3, 20E4, 20F) comprises a structural mass made of at least one refractory compound selected from refractory borides, aluminides and oxycompounds, and combinations thereof. This structural mass has an open microporosity that is impregnated with colloidal and/or polymeric particles of iron oxide and/or a precursor of iron oxide. These particles promote wetting of the structural mass by molten aluminum and/or form upon heat treatment a sintered barrier against oxygen diffusion through the structural mass. The ceramic material can be used on cathodes (15), carbon or metal-based anodes (5,5,?), sidewalls (16) and other parts (26) of aluminum electrowinning cells, on electrodes (15A) of arc furnaces, and on stirrers (10) or vessels (45) of aluminum purification apparatus.

Abstract: Al2O3-rare earth oxide-ZrO2/HfO2 ceramics (including glasses, crystalline ceramics, and glass-ceramics) and methods of making the same. Ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. The particles and fibers are useful, for example, as thermal insulation, filler, or reinforcing material in composites (e.g., ceramic, metal, or polymeric matrix composites). The thin coatings can be useful, for example, as protective coatings in applications involving wear, as well as for thermal management. Certain ceramic particles according to the present invention can be are particularly useful as abrasive particles.

Abstract: A sintered body for thermistor element of the invention is a sintered body for thermistor element containing Sr, Y, Mn, Al, Fe, and O, wherein not only respective liquid crystal phases of a perovskite type oxide and a garnet type oxide are contained, but also a liquid crystal phase of at least one of an Sr—Al based oxide and an Sr—Fe based oxide. FeYO3 and/or AlYO3 is selected as the foregoing perovskite type oxide, and at least one member selected from Y3Al5O12, Al2Fe3Y3O12, and Al3Fe2Y3O12 is selected as the foregoing garnet type oxide, respectively by the powder X-ray diffraction analysis.

Abstract: A method includes contacting a transition metal oxide, a sintering additive, and a grain growth inhibitor additive to form a mixture. The transition metal oxide include particles that have an average diameter less than about 1 micrometer and sintering the mixture to a temperature profile that is sufficiently high that a sintered mass is formed from the mixture. The sintering includes at least one of a microwave sintering or a spark plasma sintering. The thermal profile is less than about 1050 degrees Celsius.

Abstract: A method of forming (and an apparatus for forming) a metal-doped aluminum oxide layer on a substrate, particularly a semiconductor substrate or substrate assembly, using a vapor deposition process.

Abstract: Thermal expansion defects, i.e. veining, are reduced in iron, steel, and nonferrous castings by adding a lithia-containing material in a sufficient amount to the silica sand mold. Adjusting current formulations to maximize the use of lesser expensive raw materials and minimize the use of more expensive raw materials to lower the overall percentages of lithia/metallic oxide containing additives while still reducing or eliminating thermal expansion related defects in the metal casting process reduces the overall cost to manufacture the product.

Abstract: A coating composition, a method for producing the coating composition, a coating film and magnetic recording medium are described. The coating composition comprises a binder, a solvent, and an ?-alumina powder, wherein the ?-alumina powder satisfies the following (a) and (b): (a) when the ?-alumina powder is pressed to obtain a green body and the green body is sintered at 1250° C. under the atmospheric pressure, a relative density of the obtained sintered body is about 80% or more, and (b) a BET specific surface area of the ?-alumina powder is about 10 m2/g or more.

Abstract: The present invention is directed to a noise suppressor for electronic signals. The noise suppressor at least includes Aluminum Oxide (Al2O3) that is sintered under high temperature, resulting in ceramic Aluminum Oxide (Al2O3) for effectively absorbing or suppressing noise, and reshaping the waveform or filtering waveform glitch of the electronic signals.

Abstract: Al2O3—Y2O3—ZrO2/HfO2 ceramics (including glasses, crystalline ceramics, and glass-ceramics) and methods of making the same. Ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. The particles and fibers are useful, for example, as thermal insulation, filler, or reinforcing material in composites (e.g., ceramic, metal, or polymeric matrix composites). The thin coatings can be useful, for example, as protective coatings in applications involving wear, as well as for thermal management. Certain ceramic particles according to the present invention can be are particularly useful as abrasive particles.

Abstract: The invention relates to a molding composition for producing insulating or exothermic feeders and other filling funnels and feeding elements for casting molds, which comprises at least: at least 10% by weight of a porous refractory material which has a continuous open pore structure; a binder for curing the molding mixture; if appropriate, a refractory filler; a proportion of a reactive aluminum oxide having a specific surface area of at least about 0.5 m2/g and an average particle diameter (D50) of from about 0.5 to 8 ?m. The invention further relates to a process for producing a feeder and other filling funnel or feeding elements for casting molds; feeders, filling funnels or feeding elements for casting molds which are obtained by the process and also their use for producing metal castings. The feeders and further shaped bodies for the foundry industry obtained from the molding composition of the invention have a particularly high gas permeability and a low density.

Abstract: The subject matter of the invention is a component which is provided with a ceramic coating forming the surface. Inventively there is provision at least in a cover layer of the coating for nanoparticles made from a colorant (CrCoAl or a spinel-type oxide) and aluminum oxide nanoparticles. This combination of nanoparticles in the coating advantageously results in a resistance to high temperatures of the coloring of the surface of up to 1000° C. not previously known. This allows even components under great stress, such as for example compressor or turbine blades of a gas turbine, to be provided with temperature-resistant coloring. This can then be used for an optical inspection for example.

Abstract: The present invention is directed to a noise suppressor for electronic signals. The noise suppressor at least includes Aluminum Oxide (Al2O3) that is sintered under high temperature, resulting in ceramic Aluminum Oxide (Al2O3) for effectively absorbing or suppressing noise, and reshaping the waveform or filtering waveform glitch of the electronic signals.

Abstract: Polycrystalline alumina and methods for manufacturing polycrystalline alumina exhibiting improved transmission in the infrared region. In one embodiment, the percent real in-line transmittance is within about 2% of sapphire at selected wavelengths. In one or more embodiments, polycrystalline articles exhibit improved mechanical properties such as thermal shock resistance and hardness, which may find use in armor applications.

Abstract: Disclosed is a corrosion resistant member comprising a sintered material having an ?-Al2O3 crystal and an YAG (yttrium-aluminum-garnet) crystal. The corrosion resistant member contains metal elements, 70 to 98% by mass (inclusive) of Al in terms of Al2O3 and 2 to 30% by mass of Y in terms of Y2O3. The corrosion resistant member has a peak intensity ratio I116/I104 within the range from 0.94 to 1.98, preferably. 2.21 or higher, wherein I116 and I104 represent peak intensities attributed to the (116) face and the (104) face, respectively, of an ?-Al2O3 crystal as measured by X-ray diffractometry on its surface layer.

Abstract: The object of the present invention is to provide an electrostatic chuck in which the surface can be kept smooth after being exposed to plasma, so as to protect a material to be clamped such as a silicon wafer from being contaminated with particles, and which is excellent in clamping and releasing a material to be clamped. According to the present invention, there is provided an electrostatic chuck comprising a dielectric material in which alumina is 99.4 wt % or more, titanium oxide is more than 0.2 wt % and equal to or less than 0.6 wt %, whose average particle diameter is 2 ?m or less, and whose volume resistivity is 108-1011 ?cm in room temperature, wherein the electrostatic chuck is used in a low temperature of 100° C or less.

Abstract: The invention relates to a refractory ceramic product which comprises: a) ?93% by weight of at least one refractory basic component and b) ?7% by weight of at least one anticorrosive component from the group including: b1) transition metals, b2) compounds of transition metals with each other, b3) non-oxidic compounds of transition metals, b4) oxidic compounds of transition metals, b5) compounds of the transition metals with Ca, Ba, Sr.

Abstract: The magnetic head slider material of the present invention is constituted by a sintered body containing 100 parts by weight of alumina, 20 to 120 parts by weight of titanium carbide, and 0.2 to 9 parts by weight of carbon.

Abstract: A ceramic green sheet of the invention contains an inorganic powder and an organic resin and is characterized in that the inorganic powder contains 72 to 98% by weight of aluminum oxide, 1 to 12% by weight of copper oxide, 0.1 to 3% by weight of titanium oxide, and 0.25 to 10% by weight of silicon oxide based on 100% by weight of the total weight of the inorganic powder.

Abstract: The present invention relates to a green ceramic coating composition, the composition comprises nano-sized particles dispersed within a carrier medium together with preformed particles. The composition optionally comprises an infiltration medium.

Abstract: An electrostatic chuck comprises a dielectric ceramic layer made of an alumina sintered body having a volume resistivity equal to or greater than about 1×1017?·cm at room temperature and a volume resistivity equal to or greater than about 1×1014?·cm at 300° C., and an electrode formed on one surface of the dielectric ceramic layer.

Abstract: The present invention provides an aluminum oxide-titanium nitride sintered body having good resistance to electrostatic damage and small variation in volume resistivity. The aluminum oxide-titanium nitride sintered body is mainly composed of 65 to 85% by weight of aluminum oxide and titanium nitride constituting the rest. The average of the sum of the crystal grain sizes of the aluminum oxide and the titanium nitride is 0.4 to 2.0 ?m. The aluminum oxide has a mean crystal grain size of 0.5 to 2.2 ?m and the titanium nitride has a mean crystal grain size of 0.2 to 1.6 ?m.

Abstract: An alumina-titanium oxide-zirconia fused grain presenting, for a total of 100%, the following chemical composition: Al2O3: more than 10% and less than 50%; TiO2: more than 10% and less than 40%; ZrO2: more than 50%; and impurities: less than 2%; the percentages being percentages by weight on the basis of the oxides. The invention is applicable to slide gates for continuous casting of steel.

Abstract: A ceramic body that includes between about 15 volume percent and about 35 volume percent of a boron carbide irregular-shaped phase, and at least about 50 volume percent alumina, and the ceramic body has a fracture toughness (KIC, 18.5 Kg Load E&C) greater than or equal to about 4.5 MPa·m0.5.

Abstract: A process for melting material to be treated includes placing material to be treated in a container that may include an insulating lining, heating the material to be treated and melting the material to be treated, preferably allowing the melted material to cool to form a vitrified and/or crystalline mass, and disposing of the mass. The mass is either disposed while contained in container or removed from container after cooling and disposed. The insulating lining may comprise one or more layers of a thermal insulating material, one or more layers of refractory material, or a combination thereof.

Abstract: A binder is mixed to alumina powder with a purity of 99.5% or more (step S11), the mixture is granulated (step S12), resultant granule powder is formed with a die (step S13), and a formed compact is sintered in a hot-pressing manner (step S14).

Abstract: A material for a magnetic head slider according to the present invention is a magnetic head slider material comprised of a sintered body containing alumina and titanium carbide, in which an area percentage of an area of alumina crystal grains and titanium carbide crystal grains having a crystal grain size of not less than 200 nm nor more than 350 nm to an area of alumina crystal grains and titanium carbide crystal grains in a cut surface of the sintered body is not less than 80%.

Abstract: A process for making a ceramic body that includes the following steps: providing a starting powder mixture, the starting powder mixture comprises between about 15 volume percent and about 35 volume percent boron carbide powder and at least about 50 volume percent alumina powder and no more than about 5 volume percent of a sintering aid; and consolidating the powder mixture at a temperature equal to between about 1400 degrees Centigrade and 1850 degrees Centigrade to achieve a ceramic with a density equal to greater than 99 percent of theoretical density.

Abstract: An object of the present invention is to lower the sintering temperature required for a sintered body of yttrium-aluminum garnet, to improve the corrosion resistance of the sintered body and to prevent the reduction of the transmittance thereof. A sintered body of yttrium-aluminum garnet is produced from a source compound for yttrium and a source compound for aluminum using aluminum nitride as a sintering aid. It maybe considered that aluminum nitride reacts with alumina and yttria to generate liquid phase and to reduce the sintering temperature during the sintering process.

Abstract: A method of machining a workpiece including the steps of providing a workpiece; providing a ceramic cutting insert having a rake surface and a flank surface wherein the rake surface and the flank surface intersect to form a cutting edge and the ceramic cutting insert having a substrate that comprises between about 15 volume percent and about 35 volume percent of a boron carbide phase and at least about 50 volume percent alumina and has a fracture toughness (KIC, 18.5 Kg Load E&C) greater than or equal to about 4.5 MPa·m0.5; causing relative rotational movement between the workpiece and the ceramic cutting insert wherein the surface speed of the relative rotational movement is equal to or greater than about 457 surface meters per minute; and bringing the ceramic cutting insert and the workpiece into contact with each other so as to remove material from the workpiece.

Abstract: The invention relates to a melted and cast refractory product which is intended, for example, for a checker work element of a glass furnace regenerator, having the following average chemical weight composition, expressed in weight percent based on oxide content: 0.4%<MgO<2.5%; 0.2%<SIO2<2%; CaO<0.4%; impurities<0.5% AL2O3: complement.

Abstract: The present invention is directed to a noise suppressor for electronic signals. The noise suppressor at least includes Aluminum Oxide (Al2O3) that is sintered under high temperature, resulting in ceramic Aluminum Oxide (Al2O3) for effectively absorbing or suppressing noise, and reshaping the waveform or filtering waveform glitch of the electronic signals.

Abstract: A method for producing an ?-alumina particulate is described. The method for producing an ?-alumina particulate comprises steps of (Ia) and (Ib), or a step of (II): (Ia) removing water from a mixture containing water, a seed crystal and a hydrolysate obtained by hydrolysis of an aluminum compound under conditions of a pH of 5 or less and a temperature of 60° C. or less, (Ib) calcining the resulted powder, (II) calcining a mixed powder containing 75-1 wt % of an ?-alumina precursor (in terms of Al2O3) and 25-99 wt % of a seed crystal (in terms of oxide of metal component).

Abstract: An aluminum oxide sintered body contains aluminum oxide in an amount of not less than 99% by weight and at least one selected from magnesium oxide, calcium oxide and silicon oxide, and contains phosphorus of not more than 0.0025 parts by weight to 100 parts by weight of the aluminum oxide sintered body. This avoids that phosphorous exerts adverse effect on the sintering properties of an aluminum oxide sintered body, especially the sintering properties of a large aluminum oxide sintered body, causing the sintered body to lack uniformity between the sintered body inner portions and outer portions. Therefore, this aluminum oxide sintered body is suitably used in semiconductor manufacturing apparatus members or liquid crystal manufacturing apparatus members.

Abstract: A nanocomposite ceramic includes a uniform combination of a ceramic spinel phase and an alumina phase, wherein each phase exhibits a grain size in the range of from about 0.1 nm to 10,000 nm.

Abstract: Al2O3—La2O3—Y2O3—MgO ceramics (including glasses, crystalline ceramics, and glass-ceramics) and methods of making the same. Ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. The particles and fibers are useful, for example, as thermal insulation, filler, or reinforcing material in composites (e.g., ceramic, metal, or polymeric matrix composites). The thin coatings can be useful, for example, as protective coatings in applications involving wear, as well as for thermal management. Some embodiments of ceramic particles according to the present invention can be are particularly useful as abrasive particles.

Abstract: An aluminum titanate ceramic article having a predominant crystal phase of aluminum titanate and a material composition including aluminum, titanium, silica, an alkaline earth metal (e.g., at least one selected from the group of strontium, calcium, barium, or combinations), and a rare earth metal (e.g., at least one selected from the group consisting of yttrium, lanthanum, and combinations) and methods of making such aluminum titanate bodies are described. An oxide of yttrium metal or lanthanide metals is preferably used as a sintering aid in combination with the other compositional components to enable firing of the resulting green body at a lower heating temperature of less than 1500° C., and more preferably between 1400°-1450° C., with a preferable hold time of less than 8 hours, more preferably of 6 to 8 hours.

Abstract: A ceramic material for an optical member which shows black, wherein the ceramic material comprises a reaction-sintered sintered ceramic body prepared by synthesizing a formed body of a mixture comprising a ceramic raw material and a component that accelerates blackening, making use of a reaction sintering; and wherein the ceramic material is a porous body.

Abstract: A rare earth garnet sintered compact which is produced by subjecting a rare earth garnet powder such as YAG to a pre-sintering, sintering the pre-sintered product by HIP, and annealing the sintered product at 1100° C. to 1600° C. in a whole oxygen atmosphere under a whole pressure of 4.5 MPa or more, and has an average crystallite diameter of 0.9 to 9 ?m, an optical loss coefficient of 0.002 cm?1 or less and a strain of a transmitted wave of 0.05 ? cm?1 or less.