Microstructure and Fracture Toughness of Yttria‐Daped Tetragonal Zirconia Polycrystal/Mullite Composites Prepared by an in Situ Method
Authors:
- 1 December 1989
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 72 (12) , 2369-2372
Abstract
Yttria‐daped tetragonal zirconia polycrystal (Y‐TZP)/ mullite composites were prepared by three methods: in situ whisker growth (IS), physical mixing (PM) of zirconia powder and mullite whiskers, and reaction sintering (RS). Microstructures and fracture toughness values were compared. All the composites with 15 vol% of mullite could be densified to more than 95% relative density by firing at 1500° to 1500°C for 10 h. The fracture toughness of the composites as measured by the indentation method showed a clear enhancement compared with that of pure Y‐TZP; the ranking was Y‐TZP ≦ RS composite < PM composite < IS composite. Enhancement of the fracture toughness in composites was found to relte strongly to the aspect ratio of mullite particles.Keywords
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