Alloys or metallic compositions – Niobium base
Patent
1989-09-13
1991-01-08
Roy, Upendra
Alloys or metallic compositions
Niobium base
420588, 148407, C22C 2700, C22C 2104
Patent
active
049833588
ABSTRACT:
A niobium-aluminum base alloy having improved oxidation resistance at high temperatures and consisting essentially of 48%-52% niobium, 36%-42% aluminum, 4%-10% chromium, 0%-2%, more preferably 1%-2%, silicon and/or tungsten with tungsten being preferred, and 0.1%-2.0% of a rare earth selected from the group consisting of yttrium, ytterbium and erbium. Parabolic oxidation rates, k.sub.p, at 1200.degree. C. range from about 0.006 to 0.032 (mg/cm.sup.2).sup.2 /hr. The new alloys also exhibit excellent cyclic oxidation resistance.
REFERENCES:
patent: 2838396 (1958-06-01), Rhodin, Jr.
patent: 2883282 (1959-04-01), Wainer
patent: 3028236 (1962-04-01), Wlodek
patent: 3168380 (1965-02-01), Bradley
patent: 3346379 (1967-10-01), Rhodin, Jr.
patent: 3805119 (1979-04-01), Koch et al.
patent: 3887364 (1975-06-01), Kawabe et al.
patent: 4108645 (1978-08-01), Mitchell et al.
Svedberg-Oxides Associated with the Improved Air Oxidation Performance of some Niobium Intermetallics and Alloys-pp. 330-361.
Perkins and Chiang-Formation of Alumina on N6-A1 Alloys-Scripta Metallurgica-vol. 22, -pp. 419-424, (1988).
Hebsur and Locci-Microstructures in Rapidly Solidified Niobium Aluminides-NASA Technical Memorandum 100264-pp. 1-16, (1988).
Hebsur Mohan G.
Stephens Joseph R.
Roy Upendra
Sverdrup Technology, Inc.
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