Effect of AlF3 Content on Microstructure and Properties of Mullite/Al2O3 Composite Ceramics

To reinforce the mullite/Al2O3 composite ceramics through formation of mullite whiskers, the composite ceramics were prepared by pressureless sintering using different AlF3 content. The microstructure, porosity, fracture toughness and thermal shock resistance of the composite ceramics were investiga...

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Bibliographic Details
Published inMaterials science forum Vol. 922; pp. 62 - 67
Main Authors Sang, Ke Zheng, Zeng, De Jun, Li, Hong Wei, Wang, Fan
Format Journal Article
LanguageEnglish
Published Pfaffikon Trans Tech Publications Ltd 01.05.2018
Subjects
Aluminum fluorides
Aluminum oxide
Mullite
Fracture Toughness
Whisker
Composite Ceramics
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Summary:To reinforce the mullite/Al2O3 composite ceramics through formation of mullite whiskers, the composite ceramics were prepared by pressureless sintering using different AlF3 content. The microstructure, porosity, fracture toughness and thermal shock resistance of the composite ceramics were investigated. The results show that the addition of AlF3 can promote the mullite whisker formations, and the whiskers with the size of 3～10μm in diameter and a length-diameter ratio of 10～15 are obtained by sintering at 1600°C with the AlF3 content of 5wt%. Fracture toughness and thermal shock resistance of the composite ceramics are improved by the formation of mullite whisker. The fracture toughness of 4.79MPa•m1/2 can be obtained, and the 95.18% flexural strength remained after thermal shock.
Bibliography:Selected, peer reviewed papers from the 18th International Symposium on Eco-Materials Processing and Design (ISEPD2017) February 17 - 20, 2017, Okinawa, Japan
ISSN:0255-5476
1662-9752
1662-9752
DOI:10.4028/www.scientific.net/MSF.922.62