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13 November 2007Microstructures and mechanical properties of large-scale Al2O3/ZrO2(Y2O3) self-growing ceramic plates prepared by combustion synthesis under high gravity
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.
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Zhongmin Zhao, Long Zhang, Shiyue Zhang, Chuanzeng Pan, Jing Zhang, Yalin Song, 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