Method of forming complex-shaped hollow ceramic bodies

Details Method of forming complex-shaped hollow ceramic bodies Method of forming complex-shaped hollow ceramic bodies

B - Operations, Transporting

28

B

B28B 7/28 (2006.01) B28B 3/00 (2006.01) B28B 7/34 (2006.01) H01J 9/24 (2006.01)

Patent

CA 2276763

A method of forming hollow bodies of ceramic material suitable for use as the discharge vessels of high intensity discharge lamps comprises 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 pit 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.

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