Strengthening of ZrO₂ Ceramics due to Nano-Crystallization

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.

• Periodical: Advances in Science and Technology (Volume 45)
• Pages: 1674-1679
• DOI: https://doi.org/10.4028/www.scientific.net/AST.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

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