Alloy Metals, Inc.

Marvin J Stern

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.

Nickel base brazing alloy and method

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.

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.

Nickel base brazing alloy

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.

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%.

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Seattle, WA, United States of America

Marvin J Stern