Microstructures and mechanical properties of large-scale Al2O3/ZrO2(Y2O3) self-growing ceramic plates prepared by combustion synthesis under high gravity

Zhongmin Zhao; Long Zhang; Shiyue Zhang; Chuanzeng Pan; Jing Zhang; Yalin Song; Hao Zhu

doi:10.1117/12.780107

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13 November 2007 Microstructures and mechanical properties of large-scale Al₂O₃/ZrO₂(Y₂O₃) self-growing ceramic plates prepared by combustion synthesis under high gravity

Zhongmin Zhao, Long Zhang, Shiyue Zhang, Chuanzeng Pan, Jing Zhang, Yalin Song, Hao Zhu

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Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64235B (2007) https://doi.org/10.1117/12.780107
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

By introducing ZrO₂ and Y₂O₃ mixed powder into the thermit, the large-scale Al₂O₃/ZrO₂ (Y₂O₃) self-growing ceramic plates were prepared from the melts through combustion synthesis under high gravity. The materials were mainly formed by randomly-orientated rod-shaped colonies with faceted structures consisting of a triangular dispersion of orderly nano-submicron ZrO₂ fibers in the Al₂O₃ matrix, surrounded by the boundary regions that contained the coarse irregular-shaped ZrO₂ and Al₂O₃ phases. The flexural strength of the self-growing ceramic plate was excellent (measured 1278MPa), and it was not only attributed to the small critical defect size caused by the fine eutectic microstructures, excellent bonding between the Al₂O₃/ZrO₂ phases and the thin inter-colony regions, but also more importantly dependent on high fracture toughness of 13.7 MPa·m^1/2, which is controlled by residual compressive stress toughening in the colonies, transformation induced toughening and transformation induced microcrack toughening mechanisms in inter-colony regions during crack propagation.

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Zhongmin Zhao, Long Zhang, Shiyue Zhang, Chuanzeng Pan, Jing Zhang, Yalin Song, and Hao Zhu "Microstructures and mechanical properties of large-scale Al₂O₃/ZrO₂(Y₂O₃) self-growing ceramic plates prepared by combustion synthesis under high gravity", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64235B (13 November 2007); https://doi.org/10.1117/12.780107

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