Surface preparation of nickel base alloys for brazing
US4566939A · kind A · utility
17Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1985 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Jan 25, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25F1/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method is disclosed for the removal of undesirable oxides from the surface of nickel-base or nickel-iron base alloys containing oxidizable aluminum and/or titanium prior to brazing. The alloy is heated in air at an elevated temperature for a time sufficient to form on the alloy surface a bilayered film comprised of a first oxide top layer containing at least titanium or aluminum and a second layer beneath the first comprised of the alloy composition substantially depleted of aluminum and/or titanium. The surface of the alloy is cleaned to remove the first oxide layer whereupon the remaining surface is in condition for brazing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.