Abstract: A novel infiltration alloy comprises about 5 to 65% by weight of manganese, up to about 35% by weight of zinc, and the balance copper. Preferably, the infiltration alloy comprises 20% by weight of manganese, 20% by weight of zinc, and the balance copper. The infiltration alloy is useful in the manufacture of matrix bodies such as matrix drill bit bodies. A method for the manufacture of a matrix body comprises forming a hollow mold for molding at least a portion of the matrix body, positioning diamond cutting elements in the mold, packing at least a part of the mold with a powder matrix material, infiltrating the matrix material with the novel infiltration alloy in a furnace to form a mass, and allowing the mass to solidify into an integral matrix body. Because the novel infiltration alloy permits infiltration to be carried out at temperatures below about 1050.degree. C., many diamond cutting elements which begin to deteriorate at temperatures above 1000.degree. C.

Abstract: Ceramic molding or casting powders, particularly nitride, oxide and carbide powders, that have substantial internal surface and volume produce improved dispersions after being coated with a cover material, such as polyethylene glycol, that reduces the specific surface area of the powder by at least about 10% and reduces the amount of penentration of the binder used for dispersion into the internal volume of the powder. The viscosity of dispersions of such coated powders, or of conventional uncoated ceramic powders, can be further reduced by treatment of the powders with organotitanate, organozirconate, or organosilane coupling agents that are chosen to interact favorably with the specific powders and binders used.

Abstract: Components for semiconductor diffusion furnaces are constructed of a high purity impervious silicon carbide or silicon nitride matrix deposited on a pre-shaped fibrous matrix of silicon carbide, carbon, or carbon coated silicon carbide. The high purity of the matrix prevents undesired gaseous components from contaminating the atmosphere of the furnace, and the fibrous re-enforcement provides strength combined with light weight.

Abstract: A combination of a cup shaped or cylindrically shaped grinding wheel and a mounting means for such a wheel.

Abstract: Vitrified bonded abrasive bodies prepared from sol gel sintered aluminous grit particles and a vitreous (glass) bond exhibit improved abrasive performance by treating the surfaces of the grit particles so as to give them silica-enriched surfaces.

Abstract: Butt joints between materials having different coefficients of thermal expansion are prepared having a reduced probability of failure of stress facture. This is accomplished by narrowing/tapering the material having the lower coefficient of thermal expansion in a direction away from the joint interface and not joining the narrow-tapered surface to the material having the higher coefficient of thermal expansion.

Abstract: An improved process of preparing silicon nitride by the direct nitridation of silicon metal is disclosed. The process is a multi-step one which is substantially more efficient than prior processes and produces a silicon nitride having an oxygen content of less than 1%, a silicon metal content of less than 0.5%, and an alpha phase content of at least 85%, preferably at least 90%. The silicon nitride may be converted to a powder.

Abstract: Strong and durable alpha alumina ultrafiltration membranes with effective separating layers having effective pore diameters less than about 50 nm, and particularly at almost any point within the range of about 10 to about 50 nm, can be produced by seeding boehmite sols with appropriate seeds, such as very fine alpha alumina with a specific surface area of more than 100 sq. m. per g, gelling a thin layer of the sol by contact with a microfilter support, drying the gel, followed by controlled heating of the coated support both to convert the boehmite to alpha alumina and to simultaneously control the effective pore diameter of the resultant membrane.

Abstract: Catalyst bed supports having improved performance characteristics are prepared from a mixture of a clay and a feldspathic sand.

Abstract: Useful ceramic bodies can be made by mixing zirconia powder with seeded alumina gel, drying, and firing at a high enough temperature to convert the alumina in the gel to microcrystalline alpha alumina. Abrasive grits made in this way, with a zirconia content between 15 and 30 weight percent and at least half the zirconia in the tetragonal crystal form are particularly valuable for use in grinding wheels for snagging steels.

Abstract: Skis of laminated construction are assembled by joining the several lamellae with a hot metal adhesive which preferably contains an effective amount of an adhesion promoting agent. The hot melt adhesive is preferably a linear polyester, polyesteretheramide, polyetherester, polyamide, polyetherurethane, copolymer of ethylene-vinylacetate, polyesteramide, or polytheramide, and when the adhesve is based on a copolymer, it is more preferable still that the copolymer is a block copolymer.

Abstract: A product and method for conditioning fabrics, especially denim, is disclosed. The product is an artificial stone made up of an inorganic filler, inorganic abrasive particles and an inorganic bond for the filler and abrasive. The method is the use of the stone to condition fabrics.

Abstract: Essentially spherical particles are disclosed of at least 98.5% alumina having a surface area less than about 1 m.sup.2 /g, an attrition resistance of less than about 0.3 weight percent/hour in an air jet attrition test, a particle size of about 30 to about 110 microns, a tap density of about 1.3 to about 1.9 g/cc, and sufficient porosity to hold catalytic metals in conventional catalytic amounts. The alumina particles are especially suited for use as fluid bed catalyst carriers for use in environments involving the presence of steam, particularly at high temperatures.

Abstract: The present invention discloses an acid gas absorbent composition, comprising a diethylene glycol dialkyl ether represented by the general formula I:R.sup.1 O(C.sub.2 H.sub.4 O).sub.2 R.sup.2 (I)wherein R.sup.1 and R.sup.2 are independently an alkyl group of 1 to 4 carbon atoms, and a polyethylene glycol dialkyl ether represented by the general formula II:R.sup.3 O(C.sub.2 H.sub.4 O).sub.n R.sup.4 (II)wherein R.sup.3 and R.sup.4 are independently an alkyl group of 1 to 4 carbon atoms and n is an integer in the range of 3 to 8.

Abstract: Filter for hot gases, comprising a mass of grains formed of a ceramic having a high melting temperature and bonded together at contact point by molten power of the same ceramic.

Abstract: Bonded abrasive grinding tools with more cost effective grinding performance than those known in the prior art for grinding certain types of hard metals may be made by combining in the tool both grits of conventional superabrasives and grits of aluminous abrasive characterized by a microstructure that predominantly comprises tightly packed, very fine crystals of alpha alumina or of an aluminum spinel such as magnesium aluminate. The predominant crystallites in the best type of aluminous abrasive have maximum dimensions of no more than about 0.3 micron and generally show little or no regular faceting at about 5,000 magnification and are approximately equiaxed, with no higher aspect ratio than 2, usually less than 1.5.

Abstract: An improved temperature stable synthetic polycrystalline diamond (PCD) product includes at least one temperature stable PCD integrally and chemically bonded to a matrix carrier support through a carbide forming layer which is of a thickness of at least about 1 micron, the layer on at least one surface of the PCD is in turn bonded to the matrix carrier. A wide variety of shapes, sizes and configurations of such products is achieved through relatively low temperature and relatively low pressure processing. Various products of various geometries are described as well as the details of the processing to achieve chemical bonding of the PCD elements in a variety of support matrix carrier materials to form a unitary structure having a temperature stability up to about 1,200 degrees C.

Abstract: An improved silicon nitride bonded silicon carbide refractory is disclosed. The improvement results from coating the silicon carbide grains with, or introducing into the bond during the mix preparation step, zirconium orthosulfate. The resulting product has higher moduli of rupture and elasticity as compared to prior art compositions where zirconia is introduced into the bond.

Abstract: The reliability of silicon nitride bodies for use in bearings can be greatly improved by control of microstructural flaws which produce bright specular reflections when metallographically prepared surfaces of the composites are examined microscopically in low angle incident light, dark field reflected light, or reflected polarized light viewed through a crossed polarizing analyzer. The population of such flaws can be controlled by modestly increasing the normal amount of intergranular phase and longer than normal milling times before sintering. Size classification of the powder before compression also improves the performance of the body.The fatigue cycles to failure of ten percent of the silicon nitride surfaces tested at 6.9 GPa contact stress in accelerated bearing failure ASTM Test STP 771 (L.sub.

Abstract: An oxygen sensing package includes a solid electrolyte sensor and a silicon carbide heating element arranged so as to surround the solid electrolyte and radiate heat to it from convex surfaces.