Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Heat and pressure simultaneously to effect sintering
Patent
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
Patrician Thomas J.
Sylvester Vito P.
Castle Donald R.
GTE Products Corporation
Lechert Jr. Stephen J.
Quatrini L. Rita
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