Silicide composite with niobium-based metallic phase and silicon

Details Silicide composite with niobium-based metallic phase and silicon Silicide composite with niobium-based metallic phase and silicon

1998-08-12

1999-08-03

Sheehan, John

Metal treatment

Stock

Vanadium, niobum, or tantalum base

148442, 420426, 420588, C22C 2702

Patent

active

059320338

ABSTRACT:
A silicide-based composite toughened with a niobium-based metallic phase, and further containing a phase that significantly improves the oxidation resistance of the composite. The oxidation-resistant phase is a chromium-based Laves-type phase modified with silicon, which has been shown to greatly increase the oxidation resistance of silicide-based composites at temperatures of up to 1200 C. The oxidation-resistant silicide-based composite generally contains one or more silicide intermetallic phases, each of which is an M.sub.5 Si.sub.3 -type phase where M is Nb+Ti+Hf. The niobium-based metallic phase contains 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. A silicide-based composite contains, in atomic percent, about 12-25% titanium, about 6-12% hafnium, about 15-25% chromium, about 1-8% aluminum and about 12-20% silicon, with the balance essentially niobium.

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. application No. 08/498,826, filed Jul. 6, 1995, entitled "Nb-Base Alloys", Bewlay et al.

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