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Qualitative and quantitative characterization of machined ceramic surfaces with acoustic microscopy

Qualitative und quantitative Charakterisierung von bearbeiteten Keramikoberflächen mit Akustischer Mikroskopie
: Pangraz, S.; Arnold, W.

Univ. of Liege:
First Forum of Young European Researchers
Liege, 1993
Forum of Young European Researchers <1, 1993, Liege>
Conference Paper
Fraunhofer IZFP ()
akustische Mikroskopie; crack detection; Keramik; Oberfläche; Oberflächencharakterisierung; Qualitätssicherung; quality control; Rißnachweis; surface; surface characterization; zerstörungsfreie Prüfung

Beside the advantages of advanced ceramics like high working temperature and chemical resistance the low ductility of ceramics is one of their major disadvantages. The low KIC of ceramics in comparison to ductile materials entails spontaneous crack growth at the same loading conditions for smaller defects. Thus holds in particular for the surface near zone. Therefore, the quality of the finished surface is important in order to prevent damage during loading. The final machining of the ceramic surface plays a central role. Here, two different grinding methods are compared by mechanical testing and nondestructive testing methods.