Abstract: A substrate having a low dielectric constant for use with electronic devices consisting essentially of porous crystalline glass. The composition of the crystalline glass is represented by the formula X-Al.sub.2 O.sub.3 -SiO.sub.2, where X is one or more of the metal oxides ZnO, MgO, Li.sub.2 O, ZrO.sub.2, B.sub.2 O.sub.3, P.sub.2 O.sub.5, Y.sub.2 O.sub.3 and BaO. The crystalline glass may also include a filler material such as a ceramic powder or non-glass material. The substrate initially has a particle size of approximately 5 microns or less, which provides a high mechanical strength to the substrate even at high porosities.

Abstract: A particulate composition having improved stability in typical electrolytes consisting essentially of Magneli phase substoichiometric titanium oxides.

Abstract: A resealable, ventable hydrogen impermeable cover assembly for sealing a rechargeable, metal hydride hydrogen storage alloy electrochemical cell. The cover assembly includes, inter alia, a multilayered vent septum comprising at least one layer of a substantially hydrogen impermeable, highly compressible material and at least one layer of a high durometer hardness material exhibiting low pressure hysteresis.

Abstract: Metal carbides can be formed by the pyrolysis of a composition comprising metal and carboxylic acid residues bonded therein, the composition being substantially free of extraneous carbon and also having metal moieties that are not in the substituent position. Dicarboxylic acids, for example, can be reacted with either metal alkoxides or metal halides to form an oligomer or polymer which can be calcined to the metal carbide. Alternatively, a metal alkoxide can be reacted with a monocarboxylic acid to form a metal alkoxide carboxylate which can be heated to the metal carbide. Finally, a metal carboxylate can be heated to form the desired metal carbide.

Abstract: A method of toughening a fiber/matrix ceramic composite consisting of non-oxide based ceramic fibers immersed in a ceramic matrix. The method includes, prior to immersing the fibers in the matrix, applying a metallo-organic solution of a noble metal to the fibers to form a coating of the solution on the fibers, evaporating the solvent from the solution and oxidizing the residual organic compounds whereby the coating becomes a pure noble metal and immersing the coated fibers in the matrix. The applying, evaporating, oxidizing and immersing steps are characterized by a limited raising of the temperature of the fibers. The coating is ductile so as to blunt advancing cracks in the matrix.

Abstract: A coating composition is used for coating or overlaying Portland cement concrete or metal. The composition includes a synthetic polymer latex having ureido functional groups, an amine-functional epoxy curing agent, a liquid epoxy resin, and a hydraulic cement. The coating composition has superior thermal shock resistance and low cost in comparison with epoxy/amine-type polymer concrete, and excellent strength development and chemical resistance in comparison with conventional latex-based cementitious compositions. The coating composition can be mixed from a pair of storage-stable components; a dry mix including the hydraulic cement and the epoxy resin, and optionally larger size aggregate, and a wet mix including the polymer latex and the amine curing agent.

Abstract: A coating composition for a cathode ray tube, comprising the ingredients of: silica powder which has been fused during the process of flame spraying, said silica powder having an average particle size of about 0.02 to about 15 microns, electrically conductive graphite powder, with the pigment ratio of silica to graphite being within the range of 0.1 to 15, an organic thickening agent, water glass, and the balance water, said coating composition having a viscosity within the range of about 270 to about 850 cps; and wherein the coating provides markedly improved intercoat adhesion between overlapping coatings on the interior funnel of the cathode ray tube.

Abstract: As a result of the action of electron acceptors, for example chlorine, bromine and/or iodine, on compositions containing a linear, branched or structurally crosslinked polymer and an unsubstituted or substituted tetrathionaphthalene, tetraselenonaphthalene, tetratelluronaphthalene, tetrathiotetracene, tetraselenotetracene or tetratellurotetracene, electrical conductivity is imparted to the compositions through the formation of charge-transfer complexes. These compositions are suitable for the production of mouldings, filaments, fibres, coatings and composite materials which have an antistatic finish or are electrically conducting.

Abstract: A slurry composition which may be used to produce a casting slip is provided. The slurry is made by blending a ball clay/water mixture together with a separate mixture of clay and water.The blended slurry thus produced contains from about 0.01 to about 1.0 weight percent of polyelectrolyte. When this blended slurry is mixed with from 40 to 55 parts of nonplastic material (such as flint), a casting slip is produced.

Abstract: In one aspect of the invention, an air electrode material for a solid oxide fuel cell comprises Y.sub.1-a Q.sub.a MnO.sub.3, where "Q" is selected from the group consisting of Ca and Sr or mixtures thereof and "a" is from 0.1 to 0.8. Preferably, "a" is from 0.4 to 0.7. In another aspect of the invention, an electrical interconnection material for a solid oxide fuel cell comprises Y.sub.1-b Ca.sub.b Cr.sub.1-c Al.sub.c O.sub.3, where "b" is from 0.1 to 0.6 and "c" is from 0 to 9.3. Preferably, "b" is from 0.3 to 0.5 and "c" is from 0.05 to 0.1. A composite solid oxide electrochemical fuel cell incorporating these materials comprises:a solid oxide air electrode and an adjacent solid oxide electrical interconnection which commonly include the cation Y,the air electrode comprising Y.sub.1-a Q.sub.a MnO.sub.3, where "Q" is selected from the group consisting of Ca and Sr or mixtures thereof and "a" is from 0.1 to 0.8,the electrical interconnection comprising Y.sub.1-b Ca.sub.b Cr.sub.1-c Al.sub.c O.sub.

Abstract: The present invention relates, generally, to a self-supporting porous ceramic composite body and to methods for producing such articles to net or near net shape, which bodies exhibit superior thermal and mechanical properties. The invention also relates to the manufacture of ceramic-metal composite bodies which have ceramic articles incorporated therein.

Abstract: The invention relates to cement compositions and methods of use for cementing oil and gas and/or geothermal wells which reduce thermal thinning of slurries at elevated downhole temperatures. To combat thermal thinning, latex is added to a cement slurry without a latex stabilizing surfactant resulting in a slurry having low mixing viscosity and good solids suspension properties at downhole temperatures.

Abstract: A ceramic raw material mixture with improved processing properties comprising at least two chemically different raw material components, wherein at least two of the raw material components have the same type of cation on the surface thereof, at least one of the raw material components being coated with said type of cation and the coating, calculated as cation oxide, amounting to 0.01 to 6% by weight, based on the coated component, and all the raw material components having a surface with an isoelectric point of .ltoreq.pH 7.

Abstract: The present invention provides a zinc-alkaline battery giving no environmental pollution and having an excellent shelf stability, which comprises a zinc alloy as an anode active material and an aqueous alkaline solution as an electrolyte, and manganese dioxide, silver oxide and oxygen as cathode active materials, the anode constituting the battery together with the cathode and the alkaline electrolyte being in a gel form and containing 0.001 to 0.1 wt % based on the weight of the zinc alloy of a surfactant as an organic inhibitor represented by the formula of(X)--C.sub.n F.sub.2n --(Y)--(CH.sub.2 CH.sub.2 O).sub.m --(Z)wherein X is --H or --F, Y is --C.sub.2 H.sub.4 --O--CH.sub.2 CH(OH)--CH.sub.2 O--, Z is --CH.sub.3, --PO.sub.3 W.sub.2 or --SO.sub.3 W, wherein W is an alkali metal, n is 4 to 14 and m is 20 to 100, and the zinc alloy consisting of 0.01 to 1 wt % of indium, 0.005 to 0.5 wt % of one or more of lead and bismuth and the balance of zinc.

Abstract: The invention relates to a silicon nitride ceramic having a high strength both at low temperatures and at temperatures above 1000.degree. C., and to a process for its preparation.The silicon nitride ceramic contains, as the primary phase, .beta.-silicon nitride and, as a crystalline secondary phase, an yttrium compound which has been caused to crystallize out from the intergranular glass phase by thermal after-treatment. Teh yttrium-containing, crystalline secondary phase has the following d-values in an X-ray diffraction pattern using Cu-K.alpha. radiation: 4.69 .circle.; 4.05 .circle.; 3.48 .circle.; 3.20 .circle.; 3.06 .circle.; 2.81 .circle.; 2.40 .circle.; 2.07 .circle.; 2.03 .circle.; and 1.87 .circle., the most intense diffraction reflection having the d-value 3.06 .circle..+-.0.01 .circle.. A residue of amorphous glass phase is present in the ceramic as a further phase between the crystal grains.

Abstract: A pressureless sintered silicon nitride-boron nitride composite having high density and low elastic modulus has a composition of 2 to 30 wt. % boron nitride and 70 to 98% of a blend of yttrium oxide, aluminum nitride and silicon nitride.

Abstract: An abrasive article comprises abrasive particles bonded to microporous material wherein the microporous material comprises (a) a matrix consisting essentially of thermoplastic organic polymer, (b) a large proportion of finely divided water-insoluble siliceous filler, and (c) a large void volume.

Abstract: The flexural strength and fracture toughness of SiC whisker-reinforced ceramic composite are increased and the sintering temperature of the composite is lowered by the addition of chromia. The starting materials for the fabrication of the composite consist of SiC whiskers, chromia and alumina which during hot pressing will yield alumina-chromia solid solution, the matrix, and Cr.sub.3 C.sub.2 particles as individuals or coherently bonded to the ends of the whiskers, the reinforcements evenly distributed in the matrix.In the formation of the ceramic composites, the SiC whiskers are mixed with chromia and alumina. The mixture is hot pressed at pressures in a range of about 5 to 50 MPa for a duration about 0.2-2 hours and at temperatures of about 1350.degree. to 1650.degree. C. to provide a composite with a relative density greater than about 97% of theoretical density.

Abstract: Refractory compositions comprising at least eighty percent or more by weight Cr.sub.2 O.sub.3 densified by the addition of at least one-half percent and preferably about four percent TiO.sub.2 have about one-quarter percent to about fifteen percent by weight relatively finely divided monoclinic zirconia particles substantially uniformly dispersed therethrough to induce microcracks in the densified chromic oxide and improve thermal shock damage resistance of the refractory. Zirconia additions of up to at least five percent by weight exhibit the high glass corrosion resistance of similar densified chromic oxide compositions without zirconia.

Abstract: Porous glass consisting essentially of silica, zirconia and an alkali metal compound, wherein the content of zirconia is at least 5% by weight and the content of the alkali metal compound is at least 2% by weight as calculated as M.sub.2 O wherein M is an alkali metal element, and the total pore volume (A) of pores having pore radii of from 20 to 10,000 .ANG. is at least 0.2 ml/g, and the proportion of the pore volume (B) of pores having pore radii of from 100 to 10,000 .ANG. to the total pore volume (A) of pores having pore radii of from 210 to 10,000 .ANG. is at least 80%.