Abstract
Surface grinding and polishing ZrO//2 prime s tetragonal-to-monoclinic transformation resulted in residual compressive surface stress in the ZrO//2-toughened Al//2O//3 (ZTA) ceramics. When the surface stress was removed by annealing the specimens at 1350 degree C for 1 h, the fracture toughness (K//i//c) values determined by Vickers indentation technique were independent of the Vickers load. But with the as-polished specimens, the K//i//c appeared larger and strongly dependent on the Vickers load, because the surface stress impeded the crack extension.
Original language | English |
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Pages (from-to) | 296-297 |
Number of pages | 2 |
Journal | Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan |
Volume | 92 |
Issue number | 5 |
Publication status | Published - 1984 Dec 1 |
All Science Journal Classification (ASJC) codes
- Engineering(all)