Bending fatigue of Al2O3-ZrO2 ceramics.
Open Access
- 1 January 1987
- journal article
- Published by Society of Materials Science, Japan in Journal of the Society of Materials Science, Japan
- Vol. 36 (409) , 1116-1121
- https://doi.org/10.2472/jsms.36.1116
Abstract
Bending fatigue experiments were carried out for Al2O3-ZrO2 and Al2O3 ceramics under a pulsation of trapezoidal loading at 288 and 873K. In order to evaluate the fatigue damage, the degree of phase transformation of dispersed ZrO2 from the tetragonal to monoclinic phase was studied by means of X-ray analysis, and the crack length at Vicker's indentation was measured. The results obtained were summerized as follows; (1) The fatigue life was comparatively short but a clear fatigue limit could be seen at both temperatures for Al2O3-ZrO2, although such a fatigue limit could not be seen for Al2O3. From these results, it is considered that fatigue fracture originates at microcracks around the dispersed ZrO2. (2) The crack length formed at a Vicker's indentation on the tensile side of each specimen surface after the repeated pulsation of loading was much longer in the longitudinal direction than in the transverse direction. (3) No increase in the phase transformation of dispersed ZrO2 due to the pulsation of loading was observed at both 288 and 873K. (4) In order to explain the difference in indentation crack length, a simple model was proposed.Keywords
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