Abstract: A gas mixture of silane and ammonia is heated at temperatures between about 600.degree. C and 1000.degree. C producing an amorphous powdery reaction product which, when heated at a calcination temperature of at least 1100.degree. C yields ultrafine Si.sub.3 N.sub.4 powder of high purity.

Abstract: A dense polycrystalline silicon nitride body is produced by hot-pressing a particulate mixture of silicon nitride and a beryllium additive.

Abstract: The reference electrode, which is physically removed from the sensing electrode, is functionally connected by means of a Ringer's solution formulation serving as an electrolyte bridge between the reference electrode and the fluid or tissue of the patient under test.

Abstract: Infiltration reaction products are provided of molten silicon and certain blends of particulated carbon and various particulated inorganic materials substantially unreactive to molten silicon, such as boron nitride particles. These molten silicon infiltration products of reaction are readily machinable and can be applied, or formed in-situ as contiguous layers on silicon carbide, or silicon-silicon carbide substrates, etc., to produce multilayer composites having an improved impact strength over the base refractory structure.

Abstract: An inertia welding process is employed to join the stem to the substrate of a disc thereby forming an anode assembly for a rotating x-ray anode tube.

Abstract: A graphite disc assembly for a rotating x-ray tube embodying a graphite substrate and an anode target of either tungsten or tungsten rhenium joined thereto by a layer of rhodium, osmium, ruthenium, platinum, platinum-chromium, or palladium.

Abstract: A particulate dispersion of silicon nitride and beryllium additive is formed into a green body and sintered at a temperature ranging from about 1900.degree. to about 2200.degree. C in a sintering atmosphere of nitrogen at superatmospheric pressure producing a sintered body with a density ranging from about 80 to about 100%.

Abstract: A method of forming a regular solution secondary eutectic nickel-base or cobalt-base superalloy--which contains, on a weight basis, 2-9% rhenium and less than about 0.8% titanium, and optionally an element selected from the group consisting of chromium, aluminum, tantalum, carbon, nickel, cobalt, tungsten, vanadium, molybdenum, niobium, hafnium, zirconium and boron--which comprises combining at a temperature above the eutectic melt temperature of the superalloy (1) a primary eutectic nickel-base or cobalt-base superalloy scrap containing, on a weight basis, 2-9% rhenium, and less than about 0.

Abstract: A weakly acid solution of either NH.sub.4 NO.sub.3, NH.sub.4 Cl, NH.sub.4 HSO.sub.4, CH.sub.3 COOH or equimolar CH.sub.3 COOH -- CH.sub.3 COONa is employed to remove cores of either Y.sub.2 O.sub.3 or Sm.sub.2 O.sub.3 from castings of advanced superalloy materials. A molten salt bath may be used thereafter to remove reaction products formed by the reaction of the materials of the core and the metal casting.

Abstract: A particulate dispersion of silicon nitride, magnesium additive and beryllium additive is formed into a green body and sintered at a temperature ranging from about 1800.degree. C to about 2200.degree. C in a sintering atmosphere of nitrogen at superatmospheric pressure producing a sintered body with a density ranging from about 80 to about 100%.

Abstract: A particulate dispersion of silicon nitride, magnesium additive and beryllium additive is formed into a green body and sintered at a temperature ranging from about 1800.degree. C to about 2200.degree. C in a sintering atmosphere of nitrogen at superatmospheric pressure producing a sintered body with a density ranging from about 80% to about 100%.

Abstract: Individual coolant passages in the airfoil portion of a liquid-cooled turbine bucket are provided with means whereby the main flow of liquid coolant moving in each such individual passage during turbine operation under the influence of centrifugal force is split into a pair of flows with each sub-flow moving along a generally helical path. Also, the splitting means is provided with means to interrupt each sub-flow so as to enlarge significantly the internal wall area of such coolant passage with which the liquid coolant makes contact. In the embodiment described the splitting means is a twisted tape member bonded along its edges within a tubular coolant passage and the interrupting means are a series of inwardly-directed slots in the edges of the tape.

Abstract: Thermally stable, color-stabilized halobisphenolethylene polycarbonates comprising halobisphenolethylene polycarbonates containing an effective amount of a stabilizing esterified hindered phenol are described. The stabilized halobisphenolethylene polycarbonates can be molded or formed into films, sheets, fibers, laminates or other molded articles including reinforced articles by conventional molding techniques.

Abstract: This invention is concerned with a new class of polyetheramide-imide epoxy resin blends. More particularly, the invention is concerned with polyetheramide-imide epoxy resin blends which exhibit melt viscosities suitable for solventless-dry powder coating and curing of polyetherimide insulating films on various substrates. The polyetheramide-imide epoxy resin blends are also suitable for the manufacture of filaments, fibers, films, molding compounds, coatings, etc.

Abstract: A boron-containing magnesium hydroxide coating is electrolytically applied to a boron-containing electrical steel through the use of an electrolyte at 90.degree. C which is an aqueous solution of magnesium acetate and magnesium metaborate containing magnesia as a solid second phase and having a pH in the range from 8.0 to 9.0.

Abstract: Cationic polymerization of epoxy monomers, or prepolymers can be achieved by use of certain moisture sensitive dicarbonyl chelates of main row elements of Group IIIA-VA. Curable Compositions are provided which can be used as sealants, coating compounds, glues, incapsulants, etc.

Abstract: An article of manufacture having improved high temperature oxidation and corrosion resistance comprising: (a) a superalloy substrate containing a carbide reinforcing phase, and (b) a coating consisting of chromium, aluminum, carbon, at least one element selected from iron, cobalt or nickel, and optionally an element selected from yttrium or the rare earth elements.

Abstract: A method is described for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane employing a refluxing dipolar aprotic solvent, such as dimethylformamide, containing a lithium halide catalyst to produce a crystalline product consisting essentially of 1,1-dichloro-2,2-bis(4-hydroxyphenyl) ethylene. The crystalline product can be isolated in substantially pure form and converted to a high impact, flame retardant polycarbonate.

Abstract: A method is provided for converting aromatic bis(ether N-organo substituted phthalimide) to aromatic bis(ether anhydride) by heating an aqueous mixture under pressure, of aromatic bis (ether N-organo substituted phthalimide) and phthalic anhydride, or phthalic acid. An exchange is effected between phthalic anhydride or phthalic acid and the aromatic bis(ether N-organo substituted phthalimide) to produce a liquid phase mixture of aromatic bis(ether phthalic acid) and an aqueous vapor phase mixture of N-organo substituted phthalimide. The N-organo substituted phthalimide is selectively removed from the liquid phase mixture by venting the vapor phase therefrom.

Abstract: A mixture of two different kinds of particles having distinctive, different properties is employed for determining the presence of a select protein in, or the absence of a select protein from, a solution. The first kind of particle provides a property facilitating separation, while the second kind of particle provides a property facilitating detection. The particles are coated with the same protein, a protein able to interact specifically with the select protein.