Abstract: Differences in thermal expansion properties between integrated circuit chips, especially of gallium arsenide, and the dielectric substrates (especially diamond and aluminum nitride) on which said chips are mounted are accommodating by interposing between the substrate and the chip a mixed metal layer comprising at least one ductile, thermally conductive metal such as copper and at least one other metal, preferably a refractory metal, having a lower coefficient of thermal expansion, preferably tungsten. A compliant metal layer, typically of aluminum, silver, copper or gold, is preferably interposed between the substrate and the mixed metal layer.

Abstract: A method for making acyl substituted resorcinols is disclosed and the method comprises the step of contacting resorcinols and acid halides in the presence of catalytic amounts of transition metal Lewis acids.

Abstract: Silicon- and nitrogen-containing compositions prepared by the reaction of an aminoalkylsilane such as 3-aminopropyl- or 3-methylaminopropyltrimethoxysilane with a glycidoxyalkylsilane such as 3-glycidoxypropyltrimethoxysilane are useful as adhesion promoters in addition curable polyorganosiloxane compositions. The latter are illustrated by mixtures of vinyl-substituted polyorganosiloxanes and hydride polyorganosiloxanes, also containing at least one platinum group metal compound as a hydrosilylation catalyst.

Abstract: Impact modified polyphenylene ether blends are described and the blends comprise orthoester functionalized polyphenylene ethers and orthoester functionalized rubbers, and polyesters.

Abstract: Organic values are salvaged from scrap polycarbonate by heating in the presence of an acid catalyst and a C.sub.1-4 alkyl phenol such as m- or p-cresol. Among the compounds which can be salvaged are polyalkylated xanthenes, phenol and diaryl carbonate.

Abstract: Polycarbonate compositions are redistributed by melt equilibration using as the redistribution catalyst a tetraorganophosphonium hydroxide, preferably a tetra-(C.sub.1-6 alkyl)phosphonium hydroxide. Such catalysts have numerous advantages including greater redistribution efficiency, decreased color in the redistributed product and the capability of employment in the anhydrous state.

Abstract: Disubstituted monochlorotriazines such as 2-chloro-4-mesitoxy-6-glycidoxy-1,3,5-triazine are prepared in organic solution by first combining a monoorganoxy dichlorotriazine with an aqueous alkali metal hydroxide solution in a specific concentration and molar ratio, and adding to the mixture thus produced a hydroxyaliphatic or hydroxyaromatic compound, preferably glycidol, in the presence of at least one hydrophilic phase transfer catalyst such as tetra-n-butylammonium bromide. The reaction can be integrated with either or both of a prior step of dichlorotriazine preparation and a subsequent step of capping a hydroxy-terminated polymer, especially a polyphenylene ether.

Abstract: UV stabilized polycarbonates are provided having chemically combined polyhydric phenol benzotriazole carbonate units, such as 1,1-bis(4-hydroxyphenyl)-1-[4-hydroxy-3-(N-2-benzotriazole)phenyl]ethane carbonate units and methods for making. Incorporation of the polyhydric phenol benzotriazole functional units into the polycarbonate backbone can be achieved by redistribution or transesterification under melt polymerization conditions.

Abstract: Polyalkylated xanthenes are prepared by effecting reaction between an alkylated phenol such as m-cresol and an oxygenated organic material such as acetone in the presence of an acid catalyst such as methanesulfonic acid.

Abstract: An improved high performance x-ray system having a rotating anode therein which includes an improved coating for the x-ray tube rotor. The surface of the x-ray tube rotor is coated with a ductile, metal coating, preferably iron, having a thickness of about 0.2 to about 5.0 mils thick. The rotor coating has ductile properties with a strain to fail greater than 0.05% and thermal expansion properties which when placed on an x-ray tube rotor, provides at least about 40,000 x-ray scan-seconds prior to tube failure due to rotor spalling.

Abstract: Conductors of electric current in turbine generators and the like are insulated with materials resistant to damage by corona discharge. The insulating materials include an inner layer of a thermoplastic such as a polyetherimide, and an outer layer of a polyorganosiloxane material such as a silicone polyimide or the product of curing a room temperature vulcanizable silicone composition.

Abstract: A quantum splitting oxide phospor is described for use with VUV radiation. The oxide material has an atomic ratio, comprising: La.sub.1-X Pr.sub.X MgB.sub.5 O.sub.10 ; where 0<X.ltoreq.0.20. The material is stable and compatible for use as a phosphor with VUV radiation created by Hg vapor discharge.

Abstract: A composite is comprised of reinforcement fibers having a continuous coating with a first layer of a metal oxide wherein the metal is from the group consisting of aluminum, yttrium, titanium, zirconium, beryllium, silicon, and the rare earths, and a molten silicon infiltration formed silicon carbide matrix. The coating may have a second layer from the group consisting of rhodium, iridium, metal carbide, metal silicide, metal nitride, and metal diboride, on the metal oxide coating. The reinforcement fibers being fibers from the group consisting of elemental carbon, silicon carbide, and mixtures thereof. A process for producing the fiber reinforced composite comprises depositing on the fibers a continuous coating comprised of the first layer of the metal oxide, and the second layer. A carbonaceous material is admixed with the coated fibers so that at least 5 volume percent of the mixture is the fibers.

Abstract: Bis(bis-silylalkyl) dicarboxylates, especially maleates and fumarates, are prepared by a three-step process including esterification of malaic or fumaric acid or a functional derivative thereof with a branched dienol such as 1,6-heptadien-4-ol to form an alkadienol ester, reaction of the olefinic groups in said ester with a chlorosilane and alcoholysis of the chlorine atoms attached to silicon. The products are useful as adhesion promoters in addition curable polyorganosiloxane compositions.

Abstract: A method for silating unsaturated monomers by contacting a system having at least one SiH group, an unsaturated monomer, a transition metal catalyst and a free radical polymerization inhibitor is described.

Abstract: An apparatus and method for atomizing liquid metal are disclosed. A liquid metal supply is coupled to a nozzle for atomizing a stream of liquid metal in an atomizing zone extending from the nozzle. A viewing instrument provides a field of view extending to the atomization zone. A sensor coupled with the viewing instrument generates an image of the atomizing zone, and a control adjusts a flow rate of the stream responsive to the image.

Abstract: A method of forging to impart a critical amount of retained strain is described for Ni-base superalloys, particularly those which comprise a mixture of .gamma. and .gamma.' phases, and most particularly those which contain at least about 40 percent by volume of .gamma.'. This forging method harnesses nucleation-limited recrystallization, a phenomenon which has been known in the past to produce uncontrolled, non-uniform Critical grain growth, to produce forged articles having a uniform average grain size in the range of about 90-120 microns. The method comprises the selection of a forging preform formed from a Ni-base superalloy. Isothermal subsolvus forging is then used to form a precursor forging which has a near-net shape. The precursor forging is then forged using relatively high strain rate techniques, such as hammer forging, hot die forging or room temperature forging, to impart all or some portion of it with a critical amount of retained strain energy.

Abstract: Optical thin films are produced on a substrate by alternate chemical vapor deposition of two metal oxides having different indices of refraction. Said oxides are prepared from reactants capable of decomposing to form only volatile by-products, typically alkoxides. The preferred oxides are titania and spinel.

Abstract: Foils used to manufacture superconductor materials can effectively be cleaned by heat treatment prior to anodization and further processing steps. The heat treatment can be in conjunction with other cleaning processes or separate.

Abstract: An improved high performance x-ray system having a rotating anode therein which includes an improved target/stem assembly comprising a metallic target and a large bore, thin-walled tubular metal stem which, when connected to a rotor body assembly, provides a rotating x-ray tube anode assembly is disclosed. An insert of an alloy, for example, tantalum alloy, is placed between the target layer and the large bore, thin-walled tubular stem and then bonded thereto to produce a composite x-ray tube target/stem assembly. The target/stem assembly is then connected to a rotor body assembly by fasteners, preferably threaded, applied through a plate connected to the tubular stem and preferably through a thermal washer to produce a rotating anode assembly having high bond strength that provides acceptable balance during x-ray tube operations.