Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Autogenously or by activation of dry coated particles
Patent
1996-11-21
1997-12-23
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Autogenously or by activation of dry coated particles
264219, 264220, 264221, B29C 6700
Patent
active
057004110
ABSTRACT:
A method of fabricating a threaded micro-ceramic part, includes the steps of: forming a sacrificial fiber, having a melting temperature greater than the sintering temperature of the ceramic material to be used to mold the threaded micro-ceramic part; winding the sacrificial fiber about a sintered ceramic plug generally in the shape of the threaded micro-ceramic part with the winded fiber corresponding to threads; providing a green ceramic housing formed with a passage and placing the plug with the wound sacrificial fiber in the passage. The method further includes the steps of sintering the green ceramic housing containing the wound sacrificial fiber plug to provide a unitary structure; removing the wound sacrificial fiber from the unitary structure forming a threaded cavity in the unitary structure; removing the plug leaving behind a threaded mold which is adapted to form the threaded micro-ceramic part; compressing ceramic powder within the threaded mold; and sintering the threaded mold containing the compressed ceramic powder to harden the sintered ceramic powder to form the threaded micro-ceramic part whereby during sintering the formed threaded micro-ceramic part shrinks to permit its removal from the mold.
REFERENCES:
patent: 4426568 (1984-01-01), Kato et al.
patent: 4949194 (1990-08-01), MacPherson et al.
patent: 5209525 (1993-05-01), Ito
Chatterjee Dilip K.
Furlani Edward P.
Ghosh Syamal K.
Eastman Kodak Company
Fiorilla Christopher A.
Owens Raymond L.
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