Refractory metal alloys having inherent high temperature oxidation protection
US4762557A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1987 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Oct 1, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C32/0068
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high temperature, oxidation resistant alloy useful in high temperature, oxidizing environments such as those encountered in gas turbines, advanced jet engines, high temperature furnaces and glass melting and processing equipment, among others. The alloy is characterized by selecting a refractory alloy from the group consisting of molybdenum, tungsten, niobium and tantalum having dispersed therein a second phase additive of titanium nitride and a third phase additive of aluminum and titanium. Alternatively, the refractory metals may be molybdenum or tungsten and the second phase additive and third phase additive may be silicon nitride and silicon, or chromium nitride and chromium respectively. The second phase additive must be present in an amount effective to produce a protective scale while not significantly degrading the mechanical properties or decreasing the melting point of the refractory metal, and the third phase must be present in an amount effective to suppress the solubility of nitrogen in the refractory metal and enhance the stability of the second phase while not significantly degrading the mechanical properties, and the ratio of elemental aluminum to elemental titani…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.