Process for firing alloys containing easily oxidizable elements

Details Process for firing alloys containing easily oxidizable elements Process for firing alloys containing easily oxidizable elements

1993-01-27

1994-07-19

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Special medium during sintering

419 59, B22F 100

Patent

active

053307038

ABSTRACT:
A shaped material comprising powders of alloys containing easily oxidizable elements is fired in a hydrogen-based atmosphere containing at least one hydrocarbon gas in a total amount of 0.01-5.0 volume %. Therefore, the amount of oxides formed on the surfaces of material powder particles is reduced, and the sinterability of powder particle surfaces is improved owing to the sticking of atomic carbon thereto and thereby the mutual diffusion of powder particles becomes easy. As a result, there can be obtained a sintered alloy of desired density, superior in oxidation resistance, etc.

REFERENCES:
patent: 4153485 (1979-05-01), Ogata et al.
patent: 4579713 (1986-04-01), Lueth
patent: 4990181 (1991-02-01), Pierotti et al.
Metals Handbook, Ninth Ed., vol. 7 "Power Metallurgy", American Society for Metals, 1984, pp. 308-376.
Metals Handbook Ninth Edition, vol. 7; Powder Metallurgy, pp. 341-343.

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