13 November 2007 Microstructures and mechanical properties of large-scale Al2O3/ZrO2(Y2O3) self-growing ceramic plates prepared by combustion synthesis under high gravity
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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·m1/2, 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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zhongmin Zhao, Zhongmin Zhao, Long Zhang, Long Zhang, Shiyue Zhang, Shiyue Zhang, Chuanzeng Pan, Chuanzeng Pan, Jing Zhang, Jing Zhang, Yalin Song, Yalin Song, Hao Zhu, 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); doi: 10.1117/12.780107; https://doi.org/10.1117/12.780107
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