Abstract: The invention relates to nano-composite powders of alumina and metal constituted of grains of micronic size. Each grain comprises a compact matrix of alumina of a specific surface area less than 5 m.sup.2 /g, in which are dispersed crystallites of transition metals of alloys of these metals, of sizes less than 50 nm. The powder according to the invention may be produced starting with a precursor comprised of a mixed carboxylic salt of aluminum and one or more transition metals. The powders according to the invention permit producing by sintering cermets of alumina/metal benefitting from greatly improved mechanical and thermo-mechanical properties.

Abstract: A quartz glass substrate for polysilicon thin film transistor liquid crystal display, in which a halogen content is not more than 10 ppm; an OH content is not more than 100 ppm; a total content of a heavy metal element and an alkali metal element is not more than 1 ppm; and an annealing point is not less than 1,150.degree. C.

Abstract: A vitreous ceramic composition for coating ceramic articles with a zinc and alumina base capable of separating rapidly up to 50% of crystalline phase consisting essentially of gahnite. The percentages by weight of the principal ingredients of the composition are the following. SiO.sub.2 30-50%; Al.sub.2 O.sub.3 10-25%; ZnO 8-25%; B.sub.2 O.sub.3 5-20%; TiO.sub.2 0-7%; other selected oxides can be added to change the fusability characteristics and heat expansion coefficients on the basis of specific applications of the composition.

Abstract: A lanthanum chromite ceramic powder consisting essentially of 1 mol of LaCr.sub.1-x M.sub.x O.sub.3, where M is a divalent metal selected from the group of zinc, copper and mixtures thereof and x ranges from about 0.02 to 0.2, y mols of B.sub.2 O.sub.3, where y ranges from 0.0005 to 0.04, and z mols of La.sub.2 O.sub.3, where the ratio z/y ranges from 1 to 3, the powder is sintered to high density by firing a compact thereof at a temperature of about 1400.degree. C. in air or other atmosphere, and is particularly suited for use as interconnect material for solid oxide fuel cells.

Abstract: A pumpable backfill grout which hardens into a controlled low strength material and an additive for making up such a backfill grout. The grout consists essentially of portland cement, a smooth surfaced vesicular expanded perlite, fly ash, fine aggregate, water, an air entraining agent, a quick dispersing thixiotropic suspending agent and a bentonite thickening agent.

Abstract: Mineral fillers, pigments and similar materials containing carbonate are described which are characterized in that they havea) a rhombohedral or primarily round particle formb) a steepness factor of between 1.1 and 1.4c) ##EQU1## and d) an average statistical particle diameter of between 0.4 and 1.5 .mu.m.These materials may be used in the paper industry both as paper fillers and as coating pigments.

Abstract: There is disclosed a noble metal-containing overglaze colour composition in a liquid or paste form for application to ceramics. The composition comprises (1) a solution or paste of a resinate of a noble metal, (2) an amount sufficient to serve as a sintering inhibitor and alkali resistance improving agent of a solution or paste of a thorium resinate, (3) an adhesive, in particular bismuth, (4) an appropriate amount of a rosin and (5) an appropriate amount of a solvent and, further, wherein required, (6) chromium and (7) a small amount of rhodium. Preferably, the noble metal is gold, platinum or palladium.

Abstract: A composition for the production of an open-pore foam product from essentially inorganic components contains, in addition to known components, a rock-forming solid substance, a curing agent, a foaming additive, and an at least partly alkali-soluble protein to produce open pores. The rock-forming component is a reactive solid substance selected from the group consisting ofI finely dispersed oxide mixture containing amorphous silicon dioxide and aluminium oxide,II vitreous, amorphous electrofilter ash,III milled calcined bauxite,IV electrofilter ash from a brown coal power station,V undissolved amorphous silicon dioxide from an amorphous disperse powder-like, dehydrated or water-containing silicic acid or from high temperature processes (silica fume),VI metakaolin, andVII cement.The curing agent is an alkali metal silicate solution containing 1.2 to 2.5 mols of silicon dixoide per mol of potassium oxide and/or sodium oxide.

Abstract: Disclosed is a mortar.concrete composition comprising a polymer emulsion, a portland cement material and an aggregate, which is characterized in that the polymer emulsion is one prepared by neutralizing a seed polymer with an acid or a salt or by quaternizing it with a quaternizing agent, the surfaces of the emulsion grains being thereby highly densely cationated, where the seed polymer is formed by adding a monomer as represented by the following formula (I) or a mixture of the monomer (I) and copolymerizable ethylenic unsaturated monomer(s) to a seed latex of a carboxyl-modified synthetic rubber latex or synthetic resin emulsion and polymerizing them: ##STR1## The polymer of the invention may noticeably reinforce the strength of the shaped product even when the amount of the polymer added is small.

Abstract: A solder paste for fastening semiconductors onto ceramic bases in a temperature range below 380.degree. C., consisting essentially of (1) 75 to 90% by weight of a mixture of silver powder and a low-melting glass powder with the weight ratio of silver to glass being between 2:1 and 9:1 and (2) 10 to 25% by weight of an organic solvent which contains 1 to 10% by weight of a thermally readily decomposable resin, the glass powder consisting essentially of 75 to 85% by weight lead oxide, 8 to 15% by weight boron oxide, 0.5 to 10% by weight silver (I) oxide 0.5 to 10% by weight bismuth (III) oxide, 0 to 5% by weight silicon dioxide, 0 to 2% by weight aluminum oxide 0 to 2% by weight tin oxide, 0 to 2% by weight zinc oxide, the glass powder having a glass transition temperature (Tg) of 250.degree. to 300.degree. C.