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Effect of SiC Shape on The Crack-Healing Mechanism of Alumina/SiC Composite

Published online by Cambridge University Press:  01 February 2011

Wataru Nakao ,
Toshio Osada ,
Kazuya Yamane ,
Masahiro Yokouchi ,
Koji Takahashi  and
Kotoji Ando
Wataru Nakao
Affiliation:
[email protected], Yokohama National University, Department of Safety & Energy Engineering, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa, 240-8501, Japan, 81-45-339-4026, 81-45-339-4024
Toshio Osada
Affiliation:
[email protected], Japan
Kazuya Yamane
Affiliation:
[email protected], Japan
Masahiro Yokouchi
Affiliation:
[email protected], Japan
Koji Takahashi
Affiliation:
[email protected], Japan
Kotoji Ando
Affiliation:
[email protected], Japan
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Abstract

Crack-healing of structural ceramics is a most valuable technique to overcome their weak point such as surface cracks. Crack-healing ability appeared by admixing SiC to ceramics, because this function is to use the oxidation of SiC. Endowment of crack-healing ability as well as improvement in fracture toughness was expected to be achieved by compositing SiC whiskers. For this purpose, alumina / 30 vol% SiC whiskers and alumina/ 20vol% SiC whiskers/ 10 vol% SiC particles multi-composites were developed. Crack-healing ability and fracture toughness of these composites were investigated. Alumina/ 20 vol% SiC whiskers/ 10 vol% SiC particles multi-composite and alumina/ 30vol% SiC whiskers composite were found to have 1.43 times and 1.65 times higher fracture toughness than monolithic alumina, respectively. From the results of the strength recovery by crack-healing, alumina/ 20 vol% SiC whiskers/ 10 vol% SiC particles multi-composite and alumina / 30vol% SiC whiskers composite were found to be able to heal the pre-crack below 0.250 μm and 0.200 μm in surface length, respectively. In spite of the same SiC content, SiC particles and SiC whiskers multi-compositing enlarged the limit crack size to be able to crack-heal. On the other hand, increasing SiC whiskers content enhanced strength recovery of the specimen with the large crack above limit crack-size.

Keywords

strengthceramicoxidation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 888: Symposium V – Materials and Devices for Smart Systems II , 2005 , 0888-V02-07
Copyright
Copyright © Materials Research Society 2006

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