Internal nitridation of cobalt-base superalloys
US4043839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1976 |
| Grant date | Aug 23, 1977 |
| Priority date | — |
| Expiry date | May 24, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/24
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of internally nitriding and thereby strengthening cobalt-base superalloys having at least 33% cobalt, up to 0.15% carbon, no more than 25% nickel and from 1 to 3% of nitride forming elements from the group consisting of titanium, vanadium, niobium, tantalum and zirconium. The method comprises the steps of: heating the cobalt-base alloy at a temperature of from 1600.degree. to 2500.degree. F in a nitrogen-bearing atmosphere substantially free of moisture and oxygen, and diffusing nitrogen from said atmosphere into and throughout said alloy for a period of time sufficient to form nitrides having an interparticle spacing of less than 10 microns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.