Pressureless sintering, mechanical properties and oxidation behavior of ZrB2 ceramics doped with B4C

A pressureless sintering process using different amounts of boron carbide (B4C) as sintering aid was investigated for the densification of zirconium diboride (ZrB2). The sintering mechanism was converted from solid state sintering to liquid phase sintering as sintering temperature increased from 215...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2015-09, Vol.35 (10), p.2699-2705
Main Authors: Ma, Hai-Bin, Liu, Hu-Lin, Zhao, Jian, Xu, Fang-Fang, Zhang, Guo-Jun
Format: Article
Language:English
Subjects:
Mechanical property
Microstructure
Oxidation behavior
Pressureless sintering
ZrB2
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Summary:A pressureless sintering process using different amounts of boron carbide (B4C) as sintering aid was investigated for the densification of zirconium diboride (ZrB2). The sintering mechanism was converted from solid state sintering to liquid phase sintering as sintering temperature increased from 2150 to 2250°C. B4C addition improved densification by removing the oxide impurities during solid state sintering. Besides, it could restrain the growth of ZrB2 grains. At 2250°C, ZrB2 and B4C formed liquid phase which was well wetting ZrB2 grains during liquid phase sintering process. The different roles of B4C on the microstructure development, mechanical properties and oxidation resistance of the sintered ZrB2-based ceramics were investigated.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2015.03.030