Abstract: A rare earth oxide-containing sprayed plate is prepared by thermally spraying a rare earth oxide on a support to a thickness of up to 5 mm and peeling the sprayed coating from the support. Thin plates of rare earth oxide ceramics can be prepared without molding, firing and sintering steps.

Abstract: By thermal spraying, a coating having an embossed or slit pattern is formed on a substrate to construct a coated member. When the coated member is used for sintering compacts, the embossed or slit pattern on the surface helps prevent the compacts from sticking to the coated member during sintering, discourages coating separation due to thermal cycling, and provides the coated member with excellent durability. Such coated members can be effectively used for sintering or heat treating ceramics and powder metallurgy metals, particularly cermets and cemented carbides, in a vacuum, oxidizing atmosphere, inert atmosphere or reducing atmosphere.

Abstract: A wafer has a rare earth fluoride coating disposed, typically sprayed on a substrate as an outermost layer, the rare earth fluoride being selected from lanthanoid fluorides, yttrium fluoride, and scandium fluoride. It is useful as a dummy wafer in a plasma etching or deposition system.

Abstract: A wafer has a rare earth oxide layer disposed, typically sprayed, on a substrate. It is useful as a dummy wafer in a plasma etching or deposition system.

Abstract: A coated member comprising a substrate of Mo, Ta, W, Zr or carbon and a coating of rare earth-containing oxide including a surface layer having a Vickers hardness of at least 50; or a coated member comprising a substrate having a coefficient of linear expansion of at least 4×10?6 (1/K) and a coating of rare earth-containing oxide thereon is heat resistant and useful as a jig for use in the sintering of powder metallurgical metal, cermet and ceramic materials.

Abstract: A graphite-silicon carbide composite comprises a graphite substrate and a silicon carbide layer formed thereon and comprising silicon carbide particles in fused and contact bonded state. The composite has excellent oxidation resistance and finds a wide range of application as heat resistant material. The method of forming a silicon carbide layer on graphite surface is simple and consistent.

Abstract: A heat-resistant coated member comprises a substrate composed of a material selected from among molybdenum, tantalum, tungsten, zirconium, aluminum, titanium, carbon, and alloys, oxide ceramics, non-oxide ceramics and carbide materials thereof, which is covered with a layer composed primarily of a rare earth-containing oxide. In addition to heat resistance, the coated member has good corrosion resistance and non-reactivity, making it highly suitable as a part for sintering or heat-treating metals and ceramics in a vacuum, an inert atmosphere or a reducing atmosphere.

Abstract: A coated member in which a substrate made of Mo, Ta, W, Zr or carbon is coated with a yttrium-containing oxide is sufficiently heat resistant to use as a jig in the sintering or heat treatment of metals or ceramics in vacuum or an inert or reducing atmosphere at a temperature below 1300° C.

Abstract: By thermal spraying, a coating having an embossed or slit pattern is formed on a substrate to construct a coated member. When the coated member is used for sintering compacts, the embossed or slit pattern on the surface helps prevent the compacts from sticking to the coated member during sintering, discourages coating separation due to thermal cycling, and provides the coated member with excellent durability. Such coated members can be effectively used for sintering or heat treating ceramics and powder metallurgy metals, particularly cermets and cemented carbides, in a vacuum, oxidizing atmosphere, inert atmosphere or reducing atmosphere.

Abstract: A heat-resistant coated member comprises a substrate composed of a material selected from among molybdenum, tantalum, tungsten, zirconium, aluminum, titanium, carbon, and alloys, oxide ceramics, non-oxide ceramics and carbide materials thereof, which is covered with a layer composed primarily of a rare earth-containing oxide. In addition to heat resistance, the coated member has good corrosion resistance and non-reactivity, making it highly suitable as a part for sintering or heat-treating metals and ceramics in a vacuum, an inert atmosphere or a reducing atmosphere.

Abstract: The present invention is a rare earth-containing oxide member comprising a substrate comprising at least one element selected from group consisting of C, Si, Al, Ni, Ti, Fe, Mo, Ta and W, or an alloy comprising at least one element selected from group consisting of Si, Al, Ni, Ti, Fe, Mo, Ta and W; and a compound oxide laminated to the substrate, the compound oxide comprising a rare earth element (inclusive of Y) and Al and having a composition of 40 to 90 mole % of rare earth oxide and 10 to 60 mole % of Al2O3, based on the total amount of the oxides. The present invention also provides a heat-treating jig using such a rare earth-containing oxide member wherein the total amount of iron family elements, alkali metal elements and alkaline earth metal elements is not greater than 20 ppm.

Abstract: A heat-resistant coated member comprises a substrate composed of a material selected from among molybdenum, tantalum, tungsten, zirconium, aluminum, titanium, carbon, and alloys, oxide ceramics, non-oxide ceramics and carbide materials thereof, which is covered with a layer composed primarily of a rare earth-containing oxide. In addition to heat resistance, the coated member has good corrosion resistance and non-reactivity, making it highly suitable as a part for sintering or heat-treating metals and ceramics in a vacuum, an inert atmosphere or a reducing atmosphere.

Abstract: A coated member comprising a substrate of Mo, Ta, W, Zr or carbon and a coating of rare earth-containing oxide including a surface layer having a Vickers hardness of at least 50; or a coated member comprising a substrate having a coefficient of linear expansion of at least 4×10−6 (1/K) and a coating of rare earth-containing oxide thereon is heat resistant and useful as a jig for use in the sintering of powder metallurgical metal, cermet and ceramic materials.

Abstract: An object of the present invention is to provide excellent members which have high purity, good thermal shock resistance and high mechanical strength and which are useful, for example, as heat-treating jigs for use in the manufacture of semiconductors and components of etching equipment used in a process for the manufacture of semiconductors or liquid crystal devices. Specifically, the present invention provides a rare earth-containing oxide member comprising a substrate comprising at least one selected from group consisting of C, Si, Al, Ni, Ti, Fe, Mo, Ta and W, or an alloy comprising at least one selected from group consisting of Si, Al, Ni, Ti, Fe, Mo, Ta and W; and a compound oxide laminated to the substrate, the compound oxide comprising a rare earth element (inclusive of Y) and Al and having a composition of 40 to 90 mole % of rare earth oxide and 10 to 60 mole % of Al2O3, based on the total amount of the oxides.

Abstract: A coated member in which a substrate made of Mo, Ta, W, Zr or carbon is coated with a yttrium-containing oxide is sufficiently heat resistant to use as a jig in the sintering or heat treatment of metals or ceramics in vacuum or an inert or reducing atmosphere at a temperature below 1300° C.

Abstract: A heat-resistant coated member comprises a substrate composed of a material selected from among molybdenum, tantalum, tungsten, zirconium, aluminum, titanium, carbon, and alloys, oxide ceramics, non-oxide ceramics and carbide materials thereof, which is covered with a layer composed primarily of a rare earth-containing oxide. In addition to heat resistance, the coated member has good corrosion resistance and non-reactivity, making it highly suitable as a part for sintering or heat-treating metals and ceramics in a vacuum, an inert atmosphere or a reducing atmosphere.

Abstract: The present invention provides a hydrogen absorbing alloy compact for use as the negative electrode of an alkaline rechargeable battery which is made without the aid of a current-collecting support, contains a binder dispersed in the interstices formed by mutual contact of hydrogen absorbing alloy particles and on the alloy surfaces, and has a bulk density of 3.5 to 6.0 g/cm3. The present invention also provides a compact electrode which is made by forming a porous hydrogen absorbing alloy compact containing neither current-collecting support nor binder, impregnating the compact with an aqueous solution (or solvent solution) of a binder, and then drying the compact to remove the water (or solvent) alone, so that the strength of the compact is increased and good electrical contact between alloy particles is established.

Abstract: An object of the present invention is to provide a hydrogen absorbing alloy powder for use in the negative electrodes of alkaline rechargeable batteries which has excellent initial characteristics and a high rate discharge property, exhibits satisfactory life characteristics, and is hence very beneficial from a practical point of view, as well as a process for producing the same. Specifically, the present invention provides a hydrogen absorbing alloy powder for use in the negative electrodes of alkaline rechargeable batteries which has an average particle diameter of 5 to 20 &mgr;m and an oxygen content of 2,000 to 6,000 ppm and, moreover, wherein the oxygen on the surfaces of hydrogen absorbing alloy particles is present in the form of hydroxyl groups.

Abstract: The object is to provide a hydrogen absorbing alloy suitable for the negative electrode of a Ni-hydrogen storage battery which is effective at low temperatures. The object can be attained by a LaNi.sub.5 type hydrogen absorbing alloy, wherein the content of Mg in the hydrogen absorbing alloy is 50 to 500 ppm, and it is represented by a general formula RNi.sub.a Co.sub.b Al.sub.c M.sub.d, wherein R comprises not less than 77 wt % La and 23 wt % or less of one or more metals other than La, Ni, Co, Al and M, M comprises at least one kind of metals selected from the group consisting of Fe, Cr, Cu and Mn, and a to d denote a positive number within a predetermined range. In addition, it is important to contain a small amount of Ti, Pb, oxygen, carbon and/or sulfur in said alloy.

Abstract: Provided is a hydrogen absorbing alloy suitable for a negative electrode of an Ni--hydrogen storage battery effective at low temperature, more specifically, a R--Ni type of hydrogen absorbing alloy represented by a general formula RNi.sub.a Co.sub.b Al.sub.c M.sub.d, and with Mo content of 50 to 500 ppm wherein R expresses not less than 18 wt % Pr and one or more metals other than Pr, Ni, Co, Al and M, and M expresses one or more metals selected from the group consisting of Fe, Cr, Cu, and Mn, and a to d expresses positive numbers in the specified range Moreover, the above alloy further containing trace amounts of Mg, Ti, Pb, oxygen, carbon, and/or sulfur is provided.