Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making porous product
Patent
1994-11-14
1997-10-14
Wu, David W.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making porous product
419 19, 419 27, 419 37, 419 45, 419 54, 419 57, 264219, B22F 100
Patent
active
056781628
ABSTRACT:
A mold useful for injection molding, comprising: a porous network of metal and oxidized metal and a cured epoxy resin dispersed in the porous network. The mold can be prepared by a process comprising the sequential steps of (a) forming a mixture of a metal powder and a polymer binder; (b) heating the mixture at a temperature in the range from about 100.degree. C. to about 300.degree. C. to remove a majority of the polymer binder from the mixture; (c) heating the mixture resulting from step (b) at a temperature greater than about 300.degree. C. and less than the melting point of the metal in the presence of oxygen to oxidize at least a portion of the metal to form a self-adhering porous network of metal and oxidized metal; (d) contacting the self-adhering porous network with an epoxy resin to fill at least a portion of the porous network with epoxy resin; and (e) curing the body resulting from step (d) to form the mold. The shape of the mold can be performed by selective laser sintering of the mixture.
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Tobin et al., "Indirect Metal Composite Part Manufacture Using teh SLS Process", Solid Freeform Fabrication Symposium Processings, The University of Texas, Austin, Texaz, pp. 303-307 1993.
Badrinarayan et al., "Selecrive Layer Sintering of a Copper-PMMA System", Solid Freedom Fabrication Symposium Proceedings, pp. 141-146 1992.
Badrinarayan Balasubramanian
Barlow Joel W.
Beaman Joseph J.
Bourell David L.
Crawford Richard H.
Board of Regents, Univ. of Texas System
Wu David W.
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