On crack-propagation-related phenomena in Al2O3+ ZrO2and Al2O3sintered in air and hydrogen
- 1 January 1986
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 53 (1) , L11-L16
- https://doi.org/10.1080/01418618608242803
Abstract
Experiments on Al2 + ZrO2 ceramics reveal higher Young′s moduli and fracture toughness after sintering in air then in hydrogen. Since X-ray measurements showed a higher monoclinic phase content in the air-sintered material, Young′s moduli of these ceramics indicate the existence of higher residual stresses associated with a lower degree of spontaneous transformation-induced microcracking. This effect corresponds to a lower microcrack density observed on fracture surfaces of air-sintered single-phase alumina compared with the same Al2O3 sintered in H2. These results are in agreement with the estimated grain boundary strengths of the examined ceramic materials.Keywords
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