Making of articles from metallic powder

Details Making of articles from metallic powder Making of articles from metallic powder

1976-06-01

1977-12-20

Schafer, Richard E.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75211, 75214, 75225, 75246, 148126, B22F 100

Patent

active

040639401

ABSTRACT:
The invention relates to making articles from metallic powder, particularly of tool steel, alloy steel and stainless steel and cobalt based hard metal powders, of high density and quality. The powder is compacted to at least 65% density and heated in the compacted form in two stages, firstly to deoxidize it preferably to less than 400 p.p.m. oxygen content and secondly to sinter it at least at the solidus temperature of the powder to produce a compact of at least 98% relative density. Normally the powder is annealed before compaction to soften it to a condition in which it can be compacted at pressures of 15 to 40 t.s.i. to densities of at least 65%.

REFERENCES:
patent: 3460940 (1969-08-01), Talmage
patent: 3744993 (1973-07-01), Matt et al.
patent: 3937630 (1976-02-01), Kimura et al.
patent: 3954458 (1976-05-01), Roberts
Goetzel, C. G., Treatise on Powder Metallurgy, vol. I, pp. 235, 253-257, 622-623, Interscience, N.Y., 1944.

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