Process for reducing oxides contained in iron powder without sub

Details Process for reducing oxides contained in iron powder without sub Process for reducing oxides contained in iron powder without sub

1992-05-27

1993-08-10

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75362, 75369, 148513, B22F 922

Patent

active

052344894

ABSTRACT:
A process is provided for preparing carbon-containing substantially oxide-free iron powders or iron-based powders or both wherein oxygen impurities from an iron powder are removed without substantial decarburization, by heating the iron powder or iron-based powders or both under a substantially pure hydrogen atmosphere from ambient temperatures to a first intermediate temperature in an enclosure, then replacing the substantially pure hydrogen atmosphere by a substantially pure nitrogen atmosphere in the enclosure and then heating the powder to a second temperature which is higher that the first intermediate temperature, then cooling down the powder under an inert atmosphere to at least a temperature where substantially no more oxidation of the powder occurs, then removing the powder from the enclosure, the first and second temperatures being sufficient to reduce substantially all oxide impurities in the powder without substantial decarburization.

REFERENCES:
patent: 3904448 (1975-09-01), Takahashi et al.
patent: 4990182 (1991-02-01), Kageyama et al.

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