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Proceedings Paper

Microstructures and mechanical properties of large-scale Al2O3/ZrO2(Y2O3) self-growing ceramic plates prepared by combustion synthesis under high gravity
Author(s): Zhongmin Zhao; Long Zhang; Shiyue Zhang; Chuanzeng Pan; Jing Zhang; Yalin Song; Hao Zhu
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Paper 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.

Paper Details

Date Published: 13 November 2007
PDF: 8 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64235B (13 November 2007); doi: 10.1117/12.780107
Show Author Affiliations
Zhongmin Zhao, Shijiazhuang Mechanical Engineering College (China)
Long Zhang, Shijiazhuang Mechanical Engineering College (China)
Shiyue Zhang, Shijiazhuang Mechanical Engineering College (China)
Chuanzeng Pan, Shijiazhuang Mechanical Engineering College (China)
Jing Zhang, Shijiazhuang Mechanical Engineering College (China)
Yalin Song, Shijiazhuang Mechanical Engineering College (China)
Hao Zhu, Shijiazhuang Mechanical Engineering College (China)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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