Paper Title:
Strengthening of ZrO2 Ceramics due to Nano-Crystallization
| Periodical | Advances in Science and Technology (Volume 45) |
|---|---|
| Main Theme | 11th International Ceramics Congress |
| Edited by | P. VINCENZINI |
| Pages | 1674-1679 |
| DOI | 10.4028/www.scientific.net/AST.45.1674 |
| Citation | Koji Morita et al., 2006, Advances in Science and Technology, 45, 1674 |
| Online since | October, 2006 |
| Authors | Koji Morita, Keijiro Hiraga, Byung Nam Kim, Hidehiro Yoshida |
| Keywords | High-Strength, Nanoceramic, Spark Plasma Sintering (SPS), Spinel, Tetragonal Zirconia |
| Price | US$ 28,- |
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Abstract
The fracture strength σf of ZrO2-based ceramics tends to increase with decreasing grain size d. As compared with the data for submicrometer-grain-sized material with d ≈ 350 nm, nano-crystallization of ZrO2 ceramics less than d ≈ 90 nm can improve σf by a factor of 2.0-2.5. The maximum strength reaches σf ≈ 2500 MPa, which is classed as the highest σf of oxide ceramic materials. The high σf can be associated with an increase in the critical t →m transformation stress and a decrease in the flaw size due to nano-crystallization.
