Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1990-12-17
1991-07-09
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75236, 75238, 75244, 419 12, 419 17, 419 24, 419 35, 419 36, 419 37, 419 48, B22F 100
Patent
active
050302779
ABSTRACT:
A method for fabricating a titanium aluminide composite structure consisting of a filamentary material selected from the group consisting of silicon carbide, silicon carbide-coated boron, boron carbide-coated boron, titanium boride-coated silicon carbide and silicon-coated silicon carbide, embedded in an alpha-2 titanium aluminide metal matrix, which comprises the steps of providing a first beta-stabilized Ti.sub.3 Al powder containing a desired quantity of beta stabilizer, providing a second beta-stabilized Ti.sub.3 Al powder containing a sacrificial quantity of beta stabilizer in excess of the desired quantity of beta stabilizer, coating the filamentary material with the second powder, fabricating a preform consisting of the thus-coated filamentary materials surrounded by the first powder, and applying heat and pressure to consolidate the preform.
The composite structure fabricated using the method of this invention is characterized by its lack of a denuded zone and absence of fabrication cracking.
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Eylon Daniel
Revelos William C.
Smith, Jr. Paul R.
Bricker Charles E.
Lechert Jr. Stephen J.
Singer Donald J.
The United States of America as represented by the Secretary of
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