Method and apparatus for case hardening powdered metal parts

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

B - Operations, Transporting

22

F

148/42

B22F 3/24 (2006.01) B22F 3/11 (2006.01)

Patent

CA 1083021

METHOD AND APPARATUS FOR CASE HARDENING POWDERED METAL PARTS Abstract A method and apparatus is provided for case harden- ing 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 atmos- phere, the part is heated in an oxidizing atmosphere for a time period sufficient to form oxides of iron which sub- stantially fill the pores at the surface of the part. When the part is later subjected to the case hardening gaseous atmosphere, at least one element of the gaseous atmosphere reacts with the oxides of iron and Fe to pro- duce hardenable iron compounds.

276196

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