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Volume 13
Issue 1
10.3390/ma13010175
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Article

Joining Alumina and Sapphire by Growing Aluminium Borate Whiskers In-Situ, and the Whiskers’ Orientation Relationship with the Sapphire Substrate

by
Chun Li
,
Xiaoqing Si
,
Shuang Wu
,
Junlei Qi
,
Yongxian Huang
,
Jicai Feng
and
Jian Cao
*
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(1), 175; https://doi.org/10.3390/ma13010175
Received: 9 December 2019 / Revised: 24 December 2019 / Accepted: 27 December 2019 / Published: 1 January 2020
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Abstract

Bonding between polycrystal alumina and sapphire with (0001), (10 1 ¯ 0), (11 2 ¯ 0), (1 1 ¯ 02) orientations is successfully achieved by growing aluminium borate whiskers in the joint. The morphology of the whiskers in the joint is characterised by (Scanning Electron Microscopy) SEM. The relationship between the growing direction of the aluminium borate whiskers and the orientation of the sapphire substrate is investigated. The effect of the growing direction of the aluminium borate whiskers on the mechanical properties of the joint is discussed. The results show that the whiskers on the sapphire with (10 1 ¯ 0) orientation grow perpendicular to the surface of the substrate while the whiskers show a random growth on the other substrates. It is found that there is an orientation relationship between the whiskers (220) and sapphire (10 1 ¯ 0) and the morphology of the whiskers has great influence on the mechanical properties of the joint. The joint between polycrystal alumina and sapphire with (10 1 ¯ 0) orientation exhibits the highest strength, which reaches 26 MPa. View Full-Text
Keywords: alumina; alumina borate whiskers; texture; XRD alumina; alumina borate whiskers; texture; XRD
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MDPI and ACS Style

Li, C.; Si, X.; Wu, S.; Qi, J.; Huang, Y.; Feng, J.; Cao, J. Joining Alumina and Sapphire by Growing Aluminium Borate Whiskers In-Situ, and the Whiskers’ Orientation Relationship with the Sapphire Substrate. Materials 2020, 13, 175. https://doi.org/10.3390/ma13010175

AMA Style

Li C, Si X, Wu S, Qi J, Huang Y, Feng J, Cao J. Joining Alumina and Sapphire by Growing Aluminium Borate Whiskers In-Situ, and the Whiskers’ Orientation Relationship with the Sapphire Substrate. Materials. 2020; 13(1):175. https://doi.org/10.3390/ma13010175

Chicago/Turabian Style

Li, Chun, Xiaoqing Si, Shuang Wu, Junlei Qi, Yongxian Huang, Jicai Feng, and Jian Cao. 2020. "Joining Alumina and Sapphire by Growing Aluminium Borate Whiskers In-Situ, and the Whiskers’ Orientation Relationship with the Sapphire Substrate" Materials 13, no. 1: 175. https://doi.org/10.3390/ma13010175

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