Abstract: A supersonic flame spray apparatus capable of forming a high-energy stream of a particulate feedstock for flame spray applications. The flame spray apparatus includes a converging throat in which a two-stage exothermic reaction is created and maintained comprising a flame front and a steady-state continuous detonation. As fuel gas is injected into the flame front, a steady-state continuous detonation reaction is achieved in a fuel-rich zone. A partriculate feedstock is fed into the converging throat at a low-pressure region of the continuous detonation and then passes through the flame front heating the particles. The heated particles are entrained in the expanding combustion gases which flow in an axial high-velocity collimated particle spray stream through a tubular barrel. In one aspect, the flame spray apparatus includes a two-wire arc assembly positioned spatially along the axial center line of the particle stream exiting the barrel.

Abstract: A nickel base brazing alloy, particularly suitable for diffusion brazing of superalloys, including gamma prime nickel base superalloys. The improved brazing alloy consists essentially of the following in weight percent: 12 to 14% chromium, 1 to 3.5% boron, 1.5 to 5% iron, less than 0.06% carbon, and the balance nickel. The brazing alloy and method of this invention is able to fill gaps in the brazed joint up to 0.02 inches, without adversely affecting the joint microstructure. The resultant microstructure of the brazed joint exhibits minorsecondary phase of ultrafine spherical secondary precipitates, in a predominant solid solution matrix resulting in improved ductility, high temperature oxidation and sulfidation resistance and elimination of the requirement for pressure brazing fixtures.

Abstract: An improved thermal spray nickel base alloy powder which forms an extremely tenacious, dense corrosion resistant coating on metal parts subject to a corrosive environment. The disclosed thermal spray powder is a nickel base alloy having 20 to 40% by weight molybdenum, and 12 to 20% by weight chromium, and preferably includes 0 to 10% by weight iron and 0.03 to 2% by weight copper plus vanadium. The metal alloy powder is preferably formed by atomizing the molten alloy, and the coating is preferably formed by thermal or plasma spray.

Abstract: A nickel base diffusion brazing alloy suitable for brazing gamma and gamma prime strengthened superalloys at temperatures as low as 2150.degree. F. The improved brazing alloy consists essentially of the following, in weight percent: 12 to 14% chromium, 2 to 4% tantalum, 2.5 to 4% boron, 0.01 to 0.06% yttrium, 2.5 to 5% aluminum, less than 0.03% carbon and the balance nickel, with incidental impurities. The preferred composition of the nickel base diffusion brazing alloy comprises 12.5 to 13.5% chromium, 2 to 4% tantalum, 2.5 to 3.5% boron, 0.01 to 0.03 yttrium, 3.5 to 4.5% aluminum, less than 0.03% carbon and the balance nickel, with incidental impurities.

Abstract: An improved thermal spray nickel base alloy powder which forms an extremely tenacious, dense corrosion resistant coating on metal parts subject to a corrosive environment. The disclosed thermal spray powder is a nickel base alloy having 20 to 40% by weight molybdenum, and 12 to 20% by weight chromium, and preferably includes 0 to 10% by weight iron and 0.03 to 2% by weight copper plus vanadium. The metal alloy powder is preferably formed by atomizing the molten alloy, and the coating is preferably formed by thermal or plasma spray.

Abstract: A nickel base, relatively low temperature brazing alloy, particularly suitable for brazing, carbon and low alloy steels, nickel base alloys, copper alloys and stainless steels, (including thin sections, eg. honeycomb) in dry-hydrogen or inert atmospheres partial-pressure or high vacuums. The brazing alloy is also suitable for brazing in "wet" endothermic and dissociated ammonia atmospheres. The brazing alloy consists essentially of, by weight, about 19 to 23 percent manganese, 5 to 8 percent silicon, 4 to 6 percent copper, 0.6 to 1.8 per cent boron, 0.01 to 0.2 percent rare earth, preferably mischmetal, additions of up to three percent tantalum, molybdenum, columbium, tungsten and aluminum, under 0.3 percent carbon and the balance nickel. The brazing alloys of this invention will braze below 1850 F, permit multiple braze cycles without remelting and provide joint service temperature to 1700 F.

Abstract: A nickel base, relatively low temperature brazing alloy, particularly suitable for brazing, carbon and low alloy steels, nickel base alloys, copper alloys and stainless steels, (including thin sections, eg. honeycomb) in dry-hydrogen or inert atmospheres and in partial-pressure or high vacuums. The brazing alloy is also suitable for brazing in "wet" endothermic and dissociated ammonia atmospheres. The brazing alloy consists essentially of, by weight, about 19 to 23 percent manganese, 5 to 8 percent silicon, 4 to 6 percent copper, 0.6 to 1.8 percent boron, 0.01 to 0.2 percent rare earth, preferably mischmetal, additions of up to 3 percent tantalum, molybdenum, columbium, tungsten, and aluminum, under 0.03 percent carbon and the balance nickel. The brazing alloys of this invention will braze below 1850.degree. F, permit multiple braze cycles without remelting and provide joint service temperature to 1700.degree. F.

Abstract: A family of ductile, non-aggressive, low temperature brazing alloys, particularly suitable for brazing and diffusion-welding aluminum alloys, titanium alloys, beryllium alloys, boron-borsic-graphite composite structures to such alloys, diamond bonding and dissimilar metal joints of aluminum, titanium or steels. The family of aluminum base brazing alloys include, by weight, 0.1 to 5% magnesium, 0.1 to 5% rare earth, 4 to 15% silicon and an addition of 1 to 9% tin, 0.3 to 5% copper, 2 to 10% palladium, 1 to 6% gallium, 1 to 8% silver or 0.1 to 0.25% bismuth or strontium, with the balance aluminum. Where the addition is palladium, the silicon content may be 0 to 12%.