Metallic powder-molded body, re-compacted body of the molded...

Details Metallic powder-molded body, re-compacted body of the molded... Metallic powder-molded body, re-compacted body of the molded...

2005-06-14

2005-06-14

Jenkins, Daniel (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

C419S011000

Reexamination Certificate

active

06905530

ABSTRACT:
In a preliminary molding step1, a metallic powder mixture7obtained by blending an iron-based metal powder7awith graphite7bsuch that the graphite is present in an amount of preferably not less than 0.1% by weight, more preferably not less than 0.3% by weight, is compacted into a preform8having a density of not less than 7.3 g/cm3. In a provisional sintering step2, the preform8is provisionally sintered at a predetermined temperature to form a metallic powder-molded body9having a structure in which the graphite remains along a grain boundary of the metal powder. In a re-compaction step3, the metallic powder-molded body9is re-compacted into a re-compacted body10. In a re-sintering step4, the re-compacted body10is re-sintered to obtain a sintered body11. In a heat treatment step5, the sintered body11is heat-treated to obtain a heat-treated sintered body11.Accordingly, in accordance with the present invention, there are provided a re-compacted body produced from a metallic powder-molded body having an excellent deformability which is suitably applied to the production of machine parts exhibiting high mechanical properties due to the use of sintered metal, and a sintered body produced from the re-compacted body as well as a process for the production thereof.

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