Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Producing hollow article
Patent
1998-10-02
1999-11-30
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Producing hollow article
B28B 130
Patent
active
059937254
ABSTRACT:
A method of forming hollow bodies of ceramic material suitable for use as the discharge vessels of high intensity discharge lamps includes forming a fugitive core of substantially pure graphite having a configuration matching the interior configuration of the hollow body. A flowable powder, including binders, of the ceramic material is formed and added to fill the annular space between a flexible elastomeric mold defining the outer contour and the fugitive core defining the inner contour. The ceramic powder is isostatically compressed in the mold about the core to form a sub-assembly. The sub-assembly is removed from the mold, heated at a rate and time and in a suitable atmosphere to volatilize the fugitive core, and subsequently the sub-assembly is sintered to form the hollow body.
REFERENCES:
patent: 3345160 (1967-10-01), Miccioli
patent: 3528809 (1970-09-01), Farnand
patent: 3907949 (1975-09-01), Carlson
patent: 4999145 (1991-03-01), Thibodeau
patent: 5173229 (1992-12-01), Miyamoto
patent: 5738819 (1998-04-01), Feagin
Abstract of JP 59-62104, Sep. 1982.
Abstract of German DE 3132141 C1, Dec. 1982.
Neil Jeffrey T.
Tarry Christopher A.
Zuk Karlene J.
Fiorilla Christopher A.
McNeill William H.
Osram Sylvania Inc.
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