Ceramic parts having small hole(s) and method of manufacturing t

Details Ceramic parts having small hole(s) and method of manufacturing t Ceramic parts having small hole(s) and method of manufacturing t

1994-12-15

1996-03-26

Turner, A. A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

428141, 428192, 428698, 428702, 428 344, 416 97R, C04B 3800

Patent

active

055018920

ABSTRACT:
In a ceramic part having at least one small hole or both a hollow portion and small hole(s) which extends from the hollow portion to an outside, an edge portion of the small hole(s) is beveled. In a ceramic part having at least one small hole for a cooling mechanism through which a cooling medium is circulated, the surface roughness of an inner surface of the small hole is R.sub.max 7 .mu.m or below. Such a ceramic part having at least one small hole has no chipping or edge around the small hole(s) which can cause breakage at high temperatures and under high pressures, and is thus stronger than a conventional ceramic part. Such a ceramic part is suitable for use at a high temperature, for example, at 1000.degree. C. or above, and is particularly suitable as a gas turbine member, such as a turbine blade or a turbine nozzle of a gas turbine.

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Kikai To Kogu, vol. 33, No. 3, pp. 97-103, 1989.

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