Abstract: Methods for forming sintered-bonded high temperature coatings over ceramic turbomachine components are provided, as are ceramic turbomachine components having such high temperature coatings formed thereover. In one embodiment, the method includes the step or process of removing a surface oxide layer from the ceramic component body of a turbomachine component to expose a treated surface of the ceramic component body. A first layer of coating precursor material, which has a solids content composed predominately of at least one rare earth silicate by weight percentage, is applied to the treated surface. The first layer of the coating precursor material is then heat treated to sinter the solids content and form a first sintered coating layer bonded to the treated surface. The steps of applying and sintering the coating precursor may be repeated, as desired, to build a sintered coating body to a desired thickness over the ceramic component body.

Abstract: A coated turbomachine component includes a ceramic component body having a principal surface. The component includes a high temperature coating. The high temperature coating includes a sintered coating body bonded directly to and intimately contacting the principal surface of the ceramic component body. The sintered coating body has a minimum porosity adjacent the principal surface and a maximum porosity at a location further from the principal surface, as taken along an axis orthogonal to the principal surface.

Abstract: Methods for forming sintered-bonded high temperature coatings over ceramic turbomachine components are provided, as are ceramic turbomachine components having such high temperature coatings formed thereover. In one embodiment, the method includes the step or process of removing a surface oxide layer from the ceramic component body of a turbomachine component to expose a treated surface of the ceramic component body. A first layer of coating precursor material, which has a solids content composed predominately of at least one rare earth silicate by weight percentage, is applied to the treated surface. The first layer of the coating precursor material is then heat treated to sinter the solids content and form a first sintered coating layer bonded to the treated surface. The steps of applying and sintering the coating precursor may be repeated, as desired, to build a sintered coating body to a desired thickness over the ceramic component body.

Abstract: Methods for forming sintered-bonded high temperature coatings over ceramic turbomachine components are provided, as are ceramic turbomachine components having such high temperature coatings formed thereover. In one embodiment, the method includes the step or process of removing a surface oxide layer from the ceramic component body of a turbomachine component to expose a treated surface of the ceramic component body. A first layer of coating precursor material, which has a solids content composed predominately of at least one rare earth silicate by weight percentage, is applied to the treated surface. The first layer of the coating precursor material is then heat treated to sinter the solids content and form a first sintered coating layer bonded to the treated surface. The steps of applying and sintering the coating precursor may be repeated, as desired, to build a sintered coating body to a desired thickness over the ceramic component body.

Abstract: Methods for forming sintered-bonded high temperature coatings over ceramic turbomachine components are provided, as are ceramic turbomachine components having such high temperature coatings formed thereover. In one embodiment, the method includes the step or process of removing a surface oxide layer from the ceramic component body of a turbomachine component to expose a treated surface of the ceramic component body. A first layer of coating precursor material, which has a solids content composed predominately of at least one rare earth silicate by weight percentage, is applied to the treated surface. The first layer of the coating precursor material is then heat treated to sinter the solids content and form a first sintered coating layer bonded to the treated surface. The steps of applying and sintering the coating precursor may be repeated, as desired, to build a sintered coating body to a desired thickness over the ceramic component body.

Abstract: Improved drying, binder evaporation, and sintering processes which may be used in conjunction with specialized sintering tools to provide for the geometrically stable sintering of large, complex, metal injection molded preform parts or flowbodies. The improved process includes a three-stage drying process, a single stage binder evaporation process, and a two-stage sintering process.

Abstract: Improved drying, binder evaporation, and sintering processes which may be used in conjunction with specialized sintering tools to provide for the geometrically stable sintering of large, complex, metal injection molded preform parts or flowbodies. The improved process includes a three-stage drying process, a single stage binder evaporation process, and a two-stage sintering process.

Abstract: Improved drying, binder evaporation, and sintering processes which may be used in conjunction with specialized sintering tools to provide for the geometrically stable sintering of large, complex, metal injection molded preform parts or flowbodies. The improved process includes a three-stage drying process, a single stage binder evaporation process, and a two-stage sintering process.

Abstract: A bonding material for Al.sub.2 O.sub.3 is provided by preparing a mixture of 73.0% by weight of molybdenum, 8.5% by weight of manganese, 1.5% by weight of manganese fluoride, 6.0% by weight of lithium fluoride and 11.0% by weight of silicon dioxide, the percentages being approximate. The mixture is added to a carrier of pine oil, xylene and toluene and the resulting bonding compound is applied to the surfaces to be bonded. Polycrystalline or single crystal (Al.sub.2 O.sub.3) surfaces with the bonding material applied thereto are dried and, after drying, the surfaces to be bonded are placed in contact. The resulting assembly is fired at a sufficiently high temperature for the formation of a bond between the surfaces. A polycrystalline or single crystal Al.sub.2 O.sub.3 surface can be bonded to a metal surface by firing the Al.sub.2 O.sub.3 surface having the bonding material applied thereto prior to placing the surfaces to be bonded in contact.

Abstract: A wafer pick up device is presented which may be used to pick up silicon wafers used in the semiconductor industry during the various stages of processing. Since the pick up device is made out of a high temperature and acid resistant material, it may be used to pick up hot wafers or to handle wafers being subjected to an acid bath. The device uses a sliding plate which slidably engages a closure channel and base plate. Two wafer holding pins fastened to an actuator bar portion of the sliding plate are used to engage a portion of the outer periphery of a wafer. A curved V-shaped groove at one end of the base plate engages another portion of the outer periphery of the wafer. The distance between the waver holding pins and curved V-shaped groove can be adjusted so that the wafer may be picked up by engaging the primary flat surface at the outer periphery of the wafer if desired. The actuator bar portion is wide enough to provide structural rigidity and facilitate holding the wafer securely in place.

Abstract: Improved conductive elements for direct exposure to reactive ambients. The conductive articles are fabricated from bodies of alpha silicon carbide comprising a minor fraction of homogeneously dispersed conductive particles. The bodies may have a sufficiently low electrical resistivity so that they may be used as heaters for direct contact with workpieces at high temperatures.

Abstract: A heat activated dispenser is disclosed which is suitable for dispensing into the ambient a variety of materials including medicaments, insect repellants, odor maskants, and the like. The dispenser is formed from compacted diatomite shaped to fit around and receive heat from a heat source such as a light bulb. The diatomite is charged with a vaporizable material which is released into the ambient in a gaseous state when heat is applied to the dispenser. A method of dispensing a vapor into an ambient comprising providing a volume of material having a vaporizable material therein and applying heat thereby causing said vaporizable material to be dispensed into the ambient atmosphere.

Abstract: An article handling device which is particularly well suited for loading articles into a reactor furnace for processing and subsequently unloading the processed articles. The article handling device is supported and vertically movable into alignment with the reactor furnace and includes an article moving device which is reciprocally vertically elevatable and reciprocally horizontally extensible for loading the articles into the reactor furnace and subsequent unloading thereof with minimal disturbing of the reactor process residue which is inherently deposited in the interior of the reactor furnace.