Ductile brazing foil for cast superalloys
Abstract
Abstract Cast superalloys of the formula P x Q y R z wherein P is an element selected from the group consisting of Fe, Ni, Cr, Co or mixtures thereof, wherein Q is a refractory element selected from the group consisting of Mo, W, Ta or a mixture thereof wherein R is a reactive element selected from the group consisting of Al, Ti, Cb or mixtures thereof, x is from about 65 to about 95 atomic percent, y is from about 1 to about 10 atomic percent, z is from about 1 to about 18 atomic percent and x+y+z is equal to about 100 in the form of thin foil are made ductile by the presence of appreciable amounts of amorphous phase and micro-crystalline, metastable single phase and subsequently boron is deposited as nickel, iron or cobalt boride on the surface of the foil at a temperature below the crystallization temperature of the superalloy. Such foil is especially suited for preplacement in a joining operation such as brazing.
Inventors
- 👤 Thomas L. D'Silva
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |