Abstract:
In order to guarantee the quality of ceramic products, about two order smaller sizes of defects in fine ceramics should be detected compared to metallic materials. To obtain higher resolution of NDE image, a micro focus Xray system is exclusively used. However, for the testing, conventional film radiography is too slow for real parts of ceramics, because of its low sensitivity and inflexibility on handling. While the new method of radioscopy with image subtraction is very useful, because the new method has higher detectability and is very much faster than conventional film radiography. In this paper the principle of the new radioscopy with image subtraction is presented and the detectabilities for many shapes of defects obtained with the method are described. The pore of 20µm in diameter in silicon nitride of 50 mm in thickness has been detected with the method. Some kinds of penetrametes which have slit-, hole- and pore-shaped defects are fabricated with ceramics. By using new radioscopy, sizing of defects in ceramics is carried out very easily and speedily. The techniques of fabrication of these test pieces are discussed.
(Ref. SXVIIIP-001-97)
Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics
at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
Buying the Symposium Proceedings from the American Ceramic Society.
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