Enhancement of thermal stability of porous bodies comprised...

Details Enhancement of thermal stability of porous bodies comprised... Enhancement of thermal stability of porous bodies comprised...

2005-12-19

2010-11-09

King, Roy (Department: 1793)

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

C075S249000

Reexamination Certificate

active

07829012

ABSTRACT:
A method for treating a porous item constructed of metal powder, such as a powder made of Series 400 stainless steel, involves a step of preheating the porous item to a temperature of between about 700 and 900° C. degrees in an oxidizing atmosphere and then sintering the body in an inert or reducing atmosphere at a temperature which is slightly below the melting temperature of the metal which comprises the porous item. The thermal stability of the resulting item is enhanced by this method so that the item retains its porosity and metallic characteristics, such as ductility, at higher (e.g. near-melting) temperatures.

REFERENCES:
patent: 3052967 (1962-09-01), Fischer
patent: 6881703 (2005-04-01), Cutler et al.
patent: 2003/0100448 (2003-05-01), Cutler et al.
patent: 0351056 (1990-01-01), None
patent: 2271781 (1994-04-01), None

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