Role of cryogenic temperature on the strengthening mechanism of SiCw-Al2O3 composites

The flexural strength of SiCw-Al2O3 composites at cryogenic temperatures was investigated for the first time. The flexural strength of SiCw-Al2O3 composites measured at 77K was 874.66±72.64MPa, which was ∼29.5% higher than that at 293K. The strengthening mechanism of SiCw-Al2O3 composites at cryogen...

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Bibliographic Details
Published in:Ceramics international 2016-11, Vol.42 (14), p.16332-16335
Main Authors: Wu, Weiwei, Gui, Jingya, Zhu, Tianbin, Xie, Zhipeng
Format: Article
Language:English
Subjects:
Ceramic composite
Cryogenic temperatures
Mechanical properties
Strengthening mechanism
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Summary:The flexural strength of SiCw-Al2O3 composites at cryogenic temperatures was investigated for the first time. The flexural strength of SiCw-Al2O3 composites measured at 77K was 874.66±72.64MPa, which was ∼29.5% higher than that at 293K. The strengthening mechanism of SiCw-Al2O3 composites at cryogenic temperatures could be attributed to the increase of elastic modulus, fracture surface energy and whisker/matrix interface strength. Also, the strengthening role of SiC whiskers was enhanced at cryogenic temperatures. So, SiCw-Al2O3 composites could be a promising material for applications in cryogenic environments.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2016.06.152