Author： Osada Toshio Nakao Wataru Takahashi Koji Ando Kotoji Saito Sinji
Publisher： Engineering Integrity Society
ISSN： 1365-4101
Source： Engineering Integrity, Vol.22, Iss.1, 2007-08, pp. : 4-10
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Abstract
Machined alumina containing 20 vol.% SiC whiskers has been subjected to various heat-treatments. The effect on local fracture stress has been investigated as a function of crack-healing temperature and time. By heating at 1400°C for 10 h prior to testing, specimens fractured from sites other than those associated with the final machining process. Thus, it was concluded that the machining cracks were completely healed by this heat treatment. Moreover, the static strength and cyclic fatigue limit at elevated temperature of the healed samples exhibited similar properties to polished samples. It is proposed that the crack-healing treatment is a viable economic technique to be applied to structural ceramics.
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