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In this paper, the rapid cooling thermal shock behaviors of ZrB2-SiC ceramics were measured using traditional water quenching method, and the rapid heating thermal shock behaviors of ZrB2-SiC ceramics were investigated using a novel in situ testing method. The measured critical thermal shock temperature difference for rapid cooling thermal shock was 373.6 ℃; however, the critical thermal shock temperature difference for rapid heating thermal shock of ZrB2-SiC ceramics was measured to be as high as 1497.2 ℃. The thermal stress distribution states after rapid cooling thermal shock and rapid heating thermal shock testing were analyzed using finite element analysis (FEA) method. The FEA results showed that there is a tensile stress existed on the surface for rapid cooling thermal shock, whereas there is a compressive stress existed on the surface for rapid heating thermal shock. The difference of thermal stress distribution resulted in the difference of the critical temperature difference for rapid cooling thermal shock and rapid heating thermal shock.


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Rapid heating thermal shock study of ultra high temperature ceramics using an in situ testing method

Show Author's information Rujie HEa,b( )Zhaoliang QUa,bDong LIANGa,b
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, China

Abstract

In this paper, the rapid cooling thermal shock behaviors of ZrB2-SiC ceramics were measured using traditional water quenching method, and the rapid heating thermal shock behaviors of ZrB2-SiC ceramics were investigated using a novel in situ testing method. The measured critical thermal shock temperature difference for rapid cooling thermal shock was 373.6 ℃; however, the critical thermal shock temperature difference for rapid heating thermal shock of ZrB2-SiC ceramics was measured to be as high as 1497.2 ℃. The thermal stress distribution states after rapid cooling thermal shock and rapid heating thermal shock testing were analyzed using finite element analysis (FEA) method. The FEA results showed that there is a tensile stress existed on the surface for rapid cooling thermal shock, whereas there is a compressive stress existed on the surface for rapid heating thermal shock. The difference of thermal stress distribution resulted in the difference of the critical temperature difference for rapid cooling thermal shock and rapid heating thermal shock.

Keywords: ultra high temperature ceramics (UHTCs), thermal shock behavior, thermal stress, finite element analysis (FEA)

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Publication history

Received: 24 May 2017
Revised: 14 July 2017
Accepted: 14 July 2017
Published: 19 December 2017
Issue date: December 2017

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© The author(s) 2017

Acknowledgements

The authors sincerely thank the financial supports from the National Natural Science Foundation of China (No. 11402003) and Young Elite Scientist Sponsorship (YESS) Program by CAST (No. 2015QNRC001).

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