Method for case hardening powdered metal parts

Details Method for case hardening powdered metal parts Method for case hardening powdered metal parts

1976-07-22

1978-01-31

Hunt, Brooks H.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 166, B22F 300

Patent

active

040713822

ABSTRACT:
A method and apparatus is provided for case hardening a porous, powdered metal part by means of a gaseous atmosphere without incurring excessive embrittlement or unacceptable physical distortion of the part. Prior to subjecting the part to the case hardening gaseous atmosphere, the part is heated in an oxidizing atmosphere for a time period sufficent to form oxides of iron which substantially fill the pores at the surface of the part. When the part is later subject to the case hardening gaseous atmosphere, at least one element of the gaseous atmosphere reacts with the oxides of iron and Fe to produce hardenable iron compounds.

REFERENCES:
patent: 3276919 (1966-10-01), Todd
patent: 3615380 (1971-10-01), Fichte
patent: 3743551 (1973-07-01), Sanderson
patent: 3880600 (1975-04-01), Zboril
patent: 3892597 (1975-07-01), Lincoln et al.
patent: 3904448 (1975-09-01), Takahashi et al.

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