The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 26, 1996
Filed:
Dec. 15, 1994
Shinji Ohtsubo, Nagoya, JP;
NGK Insulators, Ltd., , JP;
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.