Production of reactive sintered nickel aluminide material

Details Production of reactive sintered nickel aluminide material Production of reactive sintered nickel aluminide material

1987-05-15

1988-08-09

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75249, 419 23, 419 34, 419 45, 419 46, 419 57, 419 58, 419 68, 420460, B22F 300

Patent

active

047625589

ABSTRACT:
Reactive sintering process for producing a shaped body containing the nickel aluminide compound Ni.sub.3 Al, which comprises sintering a compacted shaped mass containing an intimate mixture of substances, e.g. including elemental nickel powder and elemental aluminum powder in a stoichiometric atomic ratio generally corresponding to the compound Ni.sub.3 Al, by heating the mass, e.g. in a vacuum, to an elevated sintering temperature, e.g. 500-750.degree. C., sufficiently to initiate an exothermic reaction, and at a heating rate sufficiently for consequent progressive generation of a transient liquid below the melting point of the aluminum powder and at the corresponding eutectic temperature, and upon initiation of the exothermic reaction continuing the sintering sufficiently to form a densified shaped body containing the nickel aluminide compound Ni.sub.3 Al, and having a porosity of at most about 8%, or alternatively having an essentially fully densified structure where the heating is carried out under simultaneously applied mechanical pressure for hot isostatic compaction of the compacted shaped mass.

REFERENCES:
patent: 2755184 (1956-07-01), Turner et al.
patent: 4609528 (1986-09-01), Chang et al.
patent: 4613368 (1986-09-01), Chang et al.
patent: 4676829 (1987-06-01), Chang et al.

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