Heavy tungsten-nickel-iron alloys with very high mechanical char

Details Heavy tungsten-nickel-iron alloys with very high mechanical char Heavy tungsten-nickel-iron alloys with very high mechanical char

1990-03-07

1990-10-02

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder shape or size characteristics

419 28, 419 29, 419 38, 419 60, 25248, B22F 324

Patent

active

049605631

ABSTRACT:
The invention relates to a process for the production of a heavy tungsten-nickel-iron alloy with high mechanical characteristics comprising the steps of using powders of each of the elements of a FISHER diameter between 1 and 15 .mu.m, mixing the powders in proportions corresponding to the composition of the desired alloy, compressing the powders in the form of compacted items, sintering the compacted items at a temperature of between 1490 and 1650.degree. C. for 2 to 5 hours, treating the sintered compacted items under vacuum at between 1000.degree. and 1300.degree. C., and subjecting the compacted items after treatment under vacuum to at least three cycles of operation, each cycle comprising a working step followed by a heat treatment.

REFERENCES:
patent: 3890145 (1975-06-01), Hivert et al.
patent: 4613370 (1986-09-01), Held et al.
patent: 4762559 (1988-08-01), Pemrice et al.
patent: 4851042 (1989-07-01), Bose et al.

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