Abstract: A Group IIA metal-Group IIIA metal-silicon substantially homogeneous liquid alkoxide is prepared from a reaction mixture of a Group IIA metal, a Group IIIA metal, a silicon tetraalkoxide, and a liquid defined by the formula ROR' where R is an alkyl group and R' is hydrogen or an alkyl group. The alkoxide can then be hydrolyzed, azeotropically distilled, dried, milled, and calcined to produce a ceramic powder. Advantageously, the ceramic powder can be compacted and sintered at relatively low temperatures which enable it to be used in electrical applications where high sintering temperatures would be deleterious.

Abstract: A method for engraving a series of consecutive cells in a solid surface, such as a liquid transfer surface, by impinging on the surface a pulsed laser beam in which the pulses of the laser beam are formed in a series of consecutive groups of two or more consecutive pulses and each of said groups form an individual cell in the solid surface. The article produced is also described.

Abstract: A Group IIA metal-Group IIIA metal-silicon substantially homogeneous liquid alkoxide is prepared from a reaction mixture of a Group IIA metal, a Group IIIA metal, a silicon tetraalkoxide, and a liquid defined by the formula ROR' where R is an alkyl group and R' is hydrogen or an alkyl group. The alkoxide can then be hydrolyzed, azeotropically distilled, dried, milled, and calcined to produce a ceramic powder. Advantageously, the ceramic powder can be compacted and sintered at relatively low temperatures which enable it to be used in electrical applications where high sintering temperatures would be deleterious.

Abstract: An improved erosion resistant coating for a gas path component of a turbo machine which comprises the thermal spraying of a chromium carbide, such as Cr.sub.3 C.sub.2, and an age hardenable nickel base alloy, such as Inconel 718, onto the gas path component and then, preferably, heat treating the deposited coating to harden the coating.

Abstract: A hot-pressed ceramic composite of mullite/yttria stabilized zirconia/boron nitride having good resistance to thermal shock and good erosion/corrosion resistance to molten alloys, and a method for producing said composite which comprises the blending of fused mullite with boron nitride.

Abstract: A hot-pressed ceramic composite of mullite/yttria stabilized zirconia/boron nitride having good resistance to thermal shock and good erosion/corrosion resistance to molten alloys, and a method for producing said composite which comprises the blending of fused mullite with boron nitride.

Abstract: A process for the simultaneous production of titanium diboride and boron nitride powders using a single reaction procedure in which the raw materials of the TiB.sub.2 reaction and the BN reaction are blended together and subjected to a synthesis process which yields synthesized TiB.sub.2 and BN powders.

Abstract: The invention relates to a liquid transfer article, such as a printing roll, having a laser-engraved coated surface comprised of wells adapted to receive a liquid and land areas adapted to be wiped free of any liquid prior to contacting a receiving surface so that only the liquid in the wells are transferred. The land areas of the coated surface have a density of greater than 95% theoretical and a roughness of less than 6 micro-inches R.sub.a to insure that any unwanted liquid on the land areas can be wiped clean prior to contacting a receiving surface. The invention also relates to a method for producing the liquid transfer article.

Abstract: A constant length laser device for use with laser generating means comprising a first moveable optical reflector carriage for deflecting a laser beam 180.degree. onto a spaced apart second moveable optical carriage which further deflects the laser beam 90.degree. onto a workpiece, such as a printing roll, to be laser treated and wherein the first and second carriages are synchronized to move in the same direction with the first carriage moving at a speed one half that of the second carriage so as to produce a constant length laser beam.

Abstract: A process for producing a boron nitride crucible having a closed end, an open end, an internal surface and an external surface, and wherein at least a portion of the external surface, preferably proximate the open end of the crucible, is coated with a duplex layer comprising a first coating of pyrolytic graphite and a top coat of pyrolytic boron nitride.

Abstract: A tungsten chromium carbide-nickel coated article and process for producing it in which the coating contains chromium-rich particles having at least 3 times more chromium than tungsten and wherein said chromium-rich particles comprise at least about 4.5 volume percent of the coating.

Abstract: In processes in which protective metal coating materials are applied to iron-based substrates in the form of liquid films which are then solidified by cooling, the metal coating can be contacted with a roll such as a tower roll, conveyor roll or guide roll, while the coating material is capable of transfer, by the use of a roll having an exterior ceramic barrier or surface having a thickness of at least about 20 microns whereby the surface of the coated substrate is not unduly adversely affected.

Abstract: The invention relates to a multilayer coating of at least 2 layers of a nitride-containing compound, such as titanium nitride, in which at least one layer contains at least 2 atomic percent of nitrogen different than the nitrogen contained in an adjacent layer. The invention also relates to a method for producing the multilayer coating.

Abstract: An electrolytic process for stripping a group IVB or VIB metal coating compound from a titanium based metal substrate using an aqueous electrolyte comprising an oxidizing reagent and an acid with a solution pH of less than 4.5.

Abstract: The invention relates to a method for producing a liquid transfer article for use in transferring the liquid to another surface comprising the steps of:(a) coating an article with at least one layer of a coating material selected from the group consisting of ceramic and metallic carbides;(b) superimposing over the coated surface a removable mask material of discontinuous material opaque to a beam of radiation of a selected energy level;(c) directing a laser having a beam of radiation of said selected energy level onto the coated surface of the article so as to produce in the area of the coated surface not covered by the discontinuous material a pattern of wells adapted for receiving liquid and wherein said pattern of wells is defined by the area of the coated surface which is not covered by the discontinuous material; and(d) removing the mask material from the coated article.

Abstract: A method for producing sintered shapes of refractory powders with improved strength and toughness using a grain growth inhibiting powder to inhibit grain growth.

Abstract: A pyrolytic boron nitride boat having a cavity suitable for use in growing and doping semi-conductor crystals such as gallium arsenide and said cavity having a roughened surface formed of substantially uniform projected nodules, disturbances, or ridges.

Abstract: A powder-containing composition, such as a boron nitride-containing composition for use as a film-forming coating on substrates, comprising particulate powders and particulate clay dispersed in water. The composition is also suitable for use in aerosol cans.

Abstract: A tungsten chromium carbide-nickel coated article and process for producing it in which the coating contains chromium-rich particles having at least 3 times more chromium than tungsten and wherein said chromium-rich particles comprise at least about 4.5 volume percent of the coating.

Abstract: A method for forming a dense metal boride composite article having a predetermined shape in which the method comprises blending a metal boride and a nitride to form a mixture of particles, milling the particles to a desired size, coating the particles with a lubricant formed from a polyvinyl acetate, cold forming the particles into an article of desired shape and pressureless sintering the cold formed article.