Metal treatment – Stock – Vanadium – niobum – or tantalum base
Patent
1998-08-10
1999-08-24
Sheehan, John
Metal treatment
Stock
Vanadium, niobum, or tantalum base
148442, 420426, 420588, C22C 2702
Patent
active
059420553
ABSTRACT:
A silicide-based composite toughened with a niobium-based metallic phase and further containing a silicon-modified chromium-based Laves-type phase to promote oxidation resistance. The silicide-based composite generally contains one or more silicide intermetallic phases, each of which is an M.sub.5 Si.sub.3 -type or an M.sub.3 Si-type phase where M is at least Nb+Ti+Hf. The niobium-based metallic phase contains at least niobium, titanium, hafnium, chromium, aluminum and silicon. The silicon-modified Laves-type phase is of the Cr.sub.2 M type where M is Nb+Ti+Hf. The silicide-based composite is formulated to contain greater than 25 volume percent of the niobium-based metallic phase, the balance being the silicide intermetallic phases and the silicon-modified Laves-type phase.
REFERENCES:
patent: 4762557 (1988-08-01), Nagarajan et al.
patent: 4915903 (1990-04-01), Brupbacher et al.
patent: 5640666 (1997-06-01), Jayashanker et al.
patent: 5721061 (1998-02-01), Jackson et al.
patent: 5741376 (1998-04-01), Subramanian et al.
Copending U.S. Patent application Ser. No. 08/498,826, filed Jul. 6, 1995, entitled "Nb-Base Alloys", Bewlay et al.
Bewlay Bernard Patrick
Jackson Melvin Robert
Cusick Ernest G.
General Electric Company
Johnson Noreen C.
Sheehan John
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