Method for preparing high performance ferrous materials
AssigneeThe Presmet Corporation
InventorIan W. Donaldson
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Abstract
The present invention provides a method for making metal parts from metal powder compositions comprising an iron base metal powder and an amide lubricant. The method comprises the steps of compacting said composition, pre-sintering the compacted composition, compacting the compacted and pre-sintered composition, and sintering the recompacted composition. The metal parts have improved physical and mechanical properties.
Claims24
A method of making a sintered metal part from a metal powder composition comprising an iron-based metal powder and an amide lubricant, the metal powder composition containing carbon in an amount from 0.3 to 0.8 weight percent, the method comprising the steps of:
- (a) compacting the composition at a temperature within the range of from 212° to 350° F.;
- (b) pre-sintering the compacted composition at a temperature within the range of from 1350° to 1580° F.;
- (b) lubricating the pre-sintered part with a lubricant;
- (c) recompacting the compacted and pre-sintered composition;
- and
- (d) sintering the recompacted composition at a temperature of 2000° to 2400° F. in a N2 atmosphere incorporating up to about 75% hydrogen by volume.
Dependencies are inferred from the claim text.