Abstract A flexible brazing alloy tape with a binder having less than 3% by weight total organic content and no more than about 1% by weight residual ash after melting is provided by use of a polyacrylic acid polymer, glycerol and water as a vehicle in which the powdered alloy is dissolved to form a slurry prior to casting. The polyacrylic acid polymer has a relatively low viscosity defined by a molecular weight of about 450,000. The slurry is deposited on a substrate and is dried and the resulting flexible low organic self-supporting tape is removed from the substrate to be formed into desired shapes as preforms for brazing. Alternatively a brazing alloy tape comprising a binder having a similarly low total organic content is produced by mixing the powdered alloy with polyvinyl alcohol, glycerol and water and thereafter casting the tape as described above.
A brazing alloy composition comprising a binder consisting of a low viscosity polyacrylic acid polymer and glycerol and the balance a nickel-base alloy powder.
Claim 2
Dependent Claim
24 words
A brazing alloy composition comprising a binder consisting of a low viscosity polyacrylic acid polymer and glycerol and the balance a nickel-base alloy powder.
Claim 3
Dependent Claim
39 words
A flexible brazing alloy composition comprising a binder consisting essentially of 0.87 to 1.15% by weight of a low viscosity polyacrylic acid polymer and 0.5% to 0.6% by weight glycerol, and the balance substantially all a nickel-base alloy powder.
Claim 4
Dependent Claim
39 words
A flexible brazing alloy composition comprising a binder consisting essentially of 0.87 to 1.15% by weight of a low viscosity polyacrylic acid polymer and 0.5% to 0.6% by weight glycerol, and the balance substantially all a nickel-base alloy powder.
Claim 5
Independent Claim
86 words
The method of preparing a self-supporting flexible tape for use in brazing, consisting of the steps of preparing a mixture consisting of an aqueous solution of low viscosity polyacrylic acid polymer, glycerol and a metal brazing powder selected from the group consisting of nickel-base alloys, copper-base alloys, and copper, casting said mixture into a tape, drying the tape so that the tape will consist of from about 0.87 to 1.15% by weight of polyacrylic acid polymer, 0.5% to 0.6% glycerol and the balance said brazing powder.
Claim 6
Independent Claim
86 words
The method of preparing a self-supporting flexible tape for use in brazing, consisting of the steps of preparing a mixture consisting of an aqueous solution of low viscosity polyacrylic acid polymer, glycerol and a metal brazing powder selected from the group consisting of nickel-base alloys, copper-base alloys, and copper, casting said mixture into a tape, drying the tape so that the tape will consist of from about 0.87 to 1.15% by weight of polyacrylic acid polymer, 0.5% to 0.6% glycerol and the balance said brazing powder.