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A normalized method for evaluation of thermal shock resistance for ceramic materials was proposed. A thermal shock resistance index (TSRI), Г, in the range of 1 to 100, was introduced, based on a normalized formula obtained directly by a simple testing process of determining the changes in flexural strength before and after thermal shock cycles. Alumina ceramic was chosen as the model material and its thermal shock behavior was investigated systematically by water quenching. Based on the experiments on alumina ceramic, the thermal shock behaviors of other 19 types of ceramic materials ranging from porcelain, refractory ceramics to advanced ceramics including structural and functional ceramics were also evaluated, and their TSRIs, Г, were derived. The dependence of Г on the coefficient of thermal expansion (CTE) of the materials was plotted, and it revealed that CTE is the most critical factor in affecting the thermal shock resistance for various ceramic materials. The effect of other factors such as porosity and fracture toughness on the index was also discussed.


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Normalized evaluation of thermal shock resistance for ceramic materials

Show Author's information Kai LIa,bDalei WANGaHan CHENaLucun GUOa( )
College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract

A normalized method for evaluation of thermal shock resistance for ceramic materials was proposed. A thermal shock resistance index (TSRI), Г, in the range of 1 to 100, was introduced, based on a normalized formula obtained directly by a simple testing process of determining the changes in flexural strength before and after thermal shock cycles. Alumina ceramic was chosen as the model material and its thermal shock behavior was investigated systematically by water quenching. Based on the experiments on alumina ceramic, the thermal shock behaviors of other 19 types of ceramic materials ranging from porcelain, refractory ceramics to advanced ceramics including structural and functional ceramics were also evaluated, and their TSRIs, Г, were derived. The dependence of Г on the coefficient of thermal expansion (CTE) of the materials was plotted, and it revealed that CTE is the most critical factor in affecting the thermal shock resistance for various ceramic materials. The effect of other factors such as porosity and fracture toughness on the index was also discussed.

Keywords:

thermal shock resistance, evaluation, ceramic materials, flexural strength
Received: 21 April 2014 Revised: 19 July 2014 Accepted: 22 July 2014 Published: 02 September 2014 Issue date: September 2014
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Publication history

Received: 21 April 2014
Revised: 19 July 2014
Accepted: 22 July 2014
Published: 02 September 2014
Issue date: September 2014

Copyright

© The author(s) 2014

Acknowledgements

This research was supported by a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and by the Program for Changjiang Scholars and Innovative Research Team in University.

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