Method for producing refractory metal parts of high hardness

Details Method for producing refractory metal parts of high hardness Method for producing refractory metal parts of high hardness

1988-02-29

1988-11-01

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Heat and pressure simultaneously to effect sintering

419 19, 419 57, G22F 100

Patent

active

047818867

ABSTRACT:
A method is disclosed for producing a high hardness refractory metal part, the method comprising hot isostatic pressing a refractory metal part having a density greater than about 98% of the theoretical density in the presence of a pressurizing gas having an atomic size great enough to strain the lattice of the refractory metal at a pressure to exceed the yield strength of the metal to result in the densification of the part to a density of greater than about 98% of the theoretical density. The part is then rapidly cooled. The resulting part has a hardness approaching the hardness of mechanically worked material.

REFERENCES:
patent: 4065302 (1977-12-01), Turillon
patent: 4066449 (1978-01-01), Havel
patent: 4332622 (1988-03-01), Jones
patent: 4582687 (1986-04-01), Asari et al.
patent: 4659546 (1987-04-01), Kearns
patent: 4673549 (1987-06-01), Ecer
patent: 4693863 (1987-09-01), Del Corso

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