Method for making composite articles that include complex intern

Details Method for making composite articles that include complex intern Method for making composite articles that include complex intern

1988-04-25

1989-05-30

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

264 56, 264 60, 264DIG36, 264340, 419 14, 419 17, 419 27, B22F /00

Patent

active

048349380

ABSTRACT:
A process is described for making a composite article without shrinkage, particularly of ceramic and metal wherein the article includes complex internal surfaces or cavities. The process requires forming an insert body that includes an external surface that corresponds to an internal cavity of the article. The insert body consists of a material having a melting temperature less than that of the article. The process further requires forming a porous compact about the insert body wherein the compact is formed into the substantially the net shape of the article. The compact is made of a material that is wetted by liquid insert material and has a sintering temperature greater than the wetting temperature of the insert material. The process further requires heating the article to a temperature such that the inserts substantially melts and infiltrates the porous compact forming the finished composite article. The process produces products including complex internal surfaces without the necessity of costly and sometimes technically difficult internal machining operations.

REFERENCES:
patent: 3929476 (1975-12-01), Kirby et al.
patent: 3973061 (1976-08-01), Easwaram et al.
patent: 4470953 (1984-09-01), Bruce
patent: 4720371 (1988-01-01), Shirley

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