Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Patent
1993-04-23
1995-02-28
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
75415, 419 23, 419 2, 419 29, B22F 300
Patent
active
053934857
ABSTRACT:
A process for the production of foamable elements, in which a metal powder is mixed with a foaming agent powder, the powder mixture is brought to an elevated temperature in a receiver and is extruded through a die, so that the extruded part can be subsequently foamed by decomposition of the foaming agent powder by heating of the extruded part and then cooled to yield a finished foam element. The powder mixture is continuously introduced into a channel, leading to the die, which has a moving wall component by which the powder mixture is transported in the channel by friction with precompacting and is extruded through the die. The speed of the wall component is selected so that the heating necessary for the precompacting comes from heat generated in the transport operation.
REFERENCES:
patent: 2937938 (1960-05-01), Fiedler et al.
patent: 3087807 (1963-04-01), Allen
patent: 4552520 (1985-11-01), East et al.
patent: 4601325 (1986-07-01), Maddock
patent: 4732551 (1988-03-01), East et al.
patent: 5015438 (1991-05-01), Ashok et al.
patent: 5151246 (1992-09-01), Baumeister et al.
Degischer Hans P.
Worz Helmut
Greaves John N.
Mepura Metallpulvergesellschaft M.G.H.
Walsh Donald P.
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