Powder metal process for producing multiphase NI-AL-TI intermeta

Details Powder metal process for producing multiphase NI-AL-TI intermeta Powder metal process for producing multiphase NI-AL-TI intermeta

1991-09-12

1992-03-24

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

419 32, 419 38, 419 54, 419 60, 419 47, B22F 900

Patent

active

050984691

ABSTRACT:
A powder metallurgy process for producing near-net shape, near-theoretical density structures of multiphase nickel, aluminum and/or titanium intermetallic alloys is provided by employing pressureless sintering techniques. The process consists of blending a brittle aluminide master alloy powder with ductile nickel powder, so as to achieve the desired composition. Then, after cold compaction of the powdered mixture, the compact is liquid phase sintered. The four step liquid phase sintering process is intended to ensure maximum degassing, eliminate surface nickel oxide, homogenize the alloy, and complete densification of the alloy by liquid phase sintering.

REFERENCES:
patent: 2755184 (1956-07-01), Turner, Jr. et al.
patent: 2877113 (1959-03-01), Fitzer
patent: 4834941 (1989-05-01), Shiina
patent: 4867806 (1989-09-01), Shiina
Bose et al., "Potential of Powder Injection Molding and Hot Isostatic Pressing of Nickel Aluminide Matrix Composites", Industrial Heating, May 1988, pp. 38-41.
Sims et al., "Reactive Sintering of Nickel Aluminide", Materials Engineering Department Rensselaer Polytechnic Institute, Troy, New York 12180-3590, pp. 1-22.

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