Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1987-10-01
1988-08-09
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
419 13, 419 23, C22C 2914
Patent
active
047625570
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 titanium, when used, is such that an inner scale of Al.sub.2 O.sub.3 forms beneath an outer layer of TiO.sub.2. The composition retains essentially all of the refractory metal in its elemental form. In this way, the high temperature advantages of the refractory metal are retained while oxidation resistance is greatly improved.
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patent: 2077239 (1937-04-01), Hinnuber
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patent: 3110589 (1963-11-01), Bechtold
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patent: 3409417 (1968-11-01), Yates
patent: 3900626 (1975-08-01), Brennan
patent: 3914500 (1975-10-01), Brennan
patent: 4711665 (1987-12-01), Simkovich
Nagarajan Vaidyanathan
Wright Ian G.
Battelle (Memorial Institute)
Lechert Jr. Stephen J.
Wiesmann Klaus H.
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