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Characterization of processing pores and their relevance to the strength in alumina ceramics

Published online by Cambridge University Press:  31 January 2011

Yao Zhang ,
Mineyuki Inoue ,
Nozomu Uchida  and
Keizo Uematsu
Yao Zhang
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Kamitomioka 1603–1, Nagaoka, Niigata, Japan 940-21
Mineyuki Inoue
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Kamitomioka 1603–1, Nagaoka, Niigata, Japan 940-21
Nozomu Uchida
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Kamitomioka 1603–1, Nagaoka, Niigata, Japan 940-21
Keizo Uematsu
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Kamitomioka 1603–1, Nagaoka, Niigata, Japan 940-21
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Abstract

Characterization of bulk defects was successfully accomplished in alumina with a transmission optical microscope. The characterization technique used is based on the fact that many ceramics are essentially transparent. Most defects in this particular ceramic were found to be pore. Their size distribution was found to follow a simple power function. With these characteristics of defects, the strength distribution of the ceramics was calculated with Baratta's model and compared to the measured strength of the ceramics. A good agreement was found between them when the pore was assumed to be accompanied with cracks 4 times the length of the grain size.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 8 , August 1999 , pp. 3370 - 3374
Copyright
Copyright © Materials Research Society 1999

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