Abstract: A method is disclosed to deposit aluminum coatings on high temperature superalloys for corrosion, oxidation, and erosion protection using low temperature chemical vapor deposition and an organometallic halide precursor, specifically an aluminum alkyl halide. The process is adapted to protective coatings for turbine parts having internal passages. Due to the lower temperatures used during chemical vapor deposition, a broad range of substrate materials can be utilized. The precursor vapors clean the substrate surfaces by removing native oxides while simultaneously depositing aluminum.

Abstract: A metal borate, metal phosphate or metal borophosphate in combination with either a metal sulfide or sulfur polysiloxanes are incorporated into polymer systems to produce a polymer composition which unexpectedly displays flame retardant properties without creating environmental hazards.

Abstract: A method for making polyarylene ethers comprises the step of melt polymerizing phenolic monomers in the presence of oxygen and oxidative coupling catalysts without employing environmentally unfriendly solvents.

Abstract: An apparatus and method feeds weld material to an underwater plasma transferred arc welding torch. The weld material comprises a powder, which can be entrained in a fluidizing gas flow. The weld material is fed by the apparatus from a first supply through at least one conduit to a supply container. The apparatus comprises a first powder supply pressurized with a powder carrier gas positioned above the surface of the body of water; a second powder supply container positioned below the surface of the body of water and the second powder supply container comprising at least one powder outlet port and a gas vent open to the above surface atmosphere; at least one powder conduit connecting the first container with the second container; an underwater welding torch positioned near the second container and having at least one powder inlet; and at least one powder conduit connecting the second powder supply container to the at least one powder inlet of the torch.

Abstract: High performance polymer compositions comprising orthoester or orthocarbonate functionalized olefin polymers and polyphenylene ethers, polyamides or combinations thereof, and the compositions unexpectedly display improved impact resistances and/or decreased delamination.

Abstract: A coated article for foul release for use in aquatic applications does not require a discrete tie-layer to ensure adhesion of a coating to a substrate. An adhesion promoting layer comprising an anticorrosive material and a bonding agent is applied directly to the substrate. A release layer comprising organopolysiloxane is deposited onto the adhesion promoting layer. A method for applying the foul release coating comprises the following steps: applying an adhesion promoting layer, curing the adhesion promoting layer, applying the release layer and curing the release layer.

Abstract: Organopolysiloxane oils and gums are produced by the condensation of silanol-terminated organosiloxane in the presence of an effective amount of a peralkylated phosphazene base as a catalyst and at reduced pressure.

Abstract: A method improves the adhesion of polyurethane foam to polycarbonate by providing reactive groups on the polycarbonate surface. The adhesion is further improved by utilizing a polyurethane mix with an isocyanate index greater than 82. Articles comprising polycarbonate and polyurethane foam adhered to the polycarbonate by the method of the instant invention, such as automobile dashboards, are also provided.

Abstract: An insect abatement system prevents adhesion of insect debris to surfaces which must be kept substantially free of insect debris. An article is coated with an insect abatement coating comprising polyorganosiloxane with a Shore A hardness of less than 50 and a tensile strength of less than 4 MPa. A method for preventing the adhesion of insect debris to surfaces includes the step of applying an insect abatement coating to a surface which must be kept substantially free of insect debris.

Abstract: The invention is a process for removing oxides, dirt, and organic impurities during repair of airfoils without damaging or effecting surface bond coats or base metal substrates of the airfoils. The process is especially suited for cleaning deep, tortuous cracks in the airfoils prior to brazing or alloying repair operations. The process entails using an autoclave with an organic caustic solution to fully remove the unwanted oxides, dirt, and organic impurities.

Abstract: Insect debris is removed from or prevented from adhering to insect impingement areas of an aircraft, particularly on an inlet cowl of an engine, by heating the area to 180.degree.-500.degree. C. An apparatus comprising a means to bring hot air from the aircraft engine to a plenum contiguous to the insect impingement area provides for the heating of the insect impingement areas to the required temperatures. The plenum can include at least one tube with a plurality of holes contained in a cavity within the inlet cowl. It can also include an envelope with a plurality of holes on its surface contained in a cavity within the inlet cowl.

Abstract: A system for the recycling of overspray powder during spray forming is provided. The system involves providing a refining vessel to contain an electroslag refining layer floating on a layer of molten refined metal. An ingot of unrefined metal is lowered into the vessel into contact with the molten electroslag layer. A current is passed through the slag layer to the ingot to cause surface melting at the interface between the ingot and the electroslag layer. As the ingot is surface melted at its point of contact with the slag, droplets of the unrefined metal are formed and these droplets pass down through the slag and are collected in a body of molten refined metal beneath the slag. The refined metal is held within a cold hearth. At the bottom of the cold hearth, a cold finger orifice permits the withdrawal of refined metal from the cold hearth apparatus. The refined metal passes from the cold finger orifice as a stream.

Abstract: The instant invention is directed to novel silylated agents having the formula ##STR1## where Ar and Ar' are independently substituted or unsubstituted aromatic rings, R is a branched or unbranched chain of 1 to 6 carbons, R' and R" are independently C1 to C12 alkyl or mixtures of C1 to C12 alkyl, and n is 1 or 2. The novel dibenzoylresorcinol silylated agents are capable of absorbing ultraviolet light.

Abstract: An extension is formed directly on an article by dipping a portion or end of the article having an attached integral mandrel into a molten bath of a compatible alloy, followed by withdrawal of the end under controlled conditions sufficient to cause an integral extension to solidify on the article. A ceramic mold is utilized over the dipped end of the article and the integral mandrel with a mold cavity that generally defines the shape of the extension to be formed. The mold may be formed in situ on the mandrel, or preformed and attached to the subject article over the mandrel. The integral mandrel is melted within the mold by dipping the mandrel into the molten alloy. The mandrel acts as a buffer between the molten material and the article while permitting melting of the article end and solidification of the integral extension. Extensions formed by the method of this invention have a microstructure that is continuous and compatible with that of the article.

Abstract: An extension is formed directly on an article by melting a portion or end of the article having an attached integral mandrel within a ceramic mold, followed by cooling of the end under controlled conditions sufficient to cause an integral extension to solidify on the article. A ceramic mold is attached on the end of the article over the integral mandrel with a mold cavity that generally defines the shape of the extension to be formed. The mold may be formed in situ on the mandrel, or preformed and attached to the subject article over the mandrel. Extensions formed by the method of this invention have a microstructure that is continuous and compatible with that of the article. Such microstructures may include epitaxial growth of the extension from the microstructure of the article. The method establishes a temperature gradient within the article during solidification that may be further controlled by auxiliary heating and/or cooling of the article and/or extension during the practice of the method.

Abstract: An extension is formed directly on an article by melting a compatible alloy preform within a ceramic mold, followed by cooling of the end under controlled conditions sufficient to cause an integral extension to solidify on the article. A ceramic mold is attached on the end of the article with a mold cavity that generally defines the shape of the extension to be formed. The mold may be formed in situ on a removable mandrel, or preformed and attached to the subject article. Extensions formed by the method of this invention have a microstructure that is continuous and compatible with that of the article. Such microstructures may include epitaxial growth of the extension from the microstructure of the article. The method establishes a temperature gradient within the article during solidification that may be further controlled by auxiliary heating and/or cooling of the article and/or extension during the practice of the method.

Abstract: Tris(4-hydroxyphenyl)alkanes such as 1,1,1 -tris(4-hydroxyphenyl)ethane are purified by formation of an adduct with a molar excess of a C.sub.1-4 primary alkyl tertiary amine, preferably triethylamine. Adduct formation is preferably effected in a polar organic solvent such as methanol. The pure tris(4-hydroxyphenyl)alkane may be recovered from the adduct by thermal or aqueous acid-promoted cracking.

Abstract: An improved method of making a high performance x-ray system having cathode cup assembly which reduces tube manufacturing costs and failures due to filament misalignment during the manufacturing process is available.

Abstract: Nb--Sn precursor articles are described that include a Nb alloy article that is at least partially coated with a layer of a Sn alloy, such as a Sn--Cu alloy. The precursor articles described herein have a controlled concentration of the impurity elements As and S in the Sn alloy layer. The concentration of these elements in the Sn alloy layer is less than or equal to 50 ppm by weight. This invention also describes a method for making Nb--Sn precursor articles having a controlled concentration of As and S impurities.

Abstract: A method for refined silicon carbide powder comprises attrition milling silicon carbide material in a liquid medium with a milling media to obtain refined silicon carbide particles having a specific surface area of at least 15 m.sup.2 /g, and preferably 20 m.sup.2 /g, with a median particle size of less than 0.5 microns, and preferably 0.25 microns. The invention includes the finished powder.