期刊
CERAMICS INTERNATIONAL
卷 39, 期 4, 页码 4231-4237出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.11.005
关键词
Dielectric properties; Mechanical properties; Microstructure; Gel casting; BN/Si3N4
资金
- Yangtze Scholars Program in China
- National Natural Science Foundation of China (NSFC) [51021002]
Porous BN/Si3N4 composite ceramics with different BN contents have been fabricated by gel casting. The rheological behaviors of the suspensions, microstructure, mechanical properties, dielectric properties and critical temperature difference of thermal shock (Delta T-C) of porous BN/Si3N4 composite ceramics with different BN contents were investigated. With BN contents increasing, the mechanical properties of the porous BN/Si3N4 composite ceramics were partially declined, but the dielectric properties and thermal shock resistances were enhanced at the same time. For the porous Si3N4 ceramic without BN addition, the porosity, flexural strength, dielectric constant and critical temperature difference were 48.1%, 128 MPa, 4.1 and 395 degrees C, while for the 10 vol% BN/Si3N4 porous composite ceramics, they were 49.4%, 106.6 MPa, 3.8, and 445 degrees C, respectively. The overall performance of the obtained porous BN/Si3N4 composite ceramics indicated that it could be one of the ideal candidates for high-temperature wave-transparent applications. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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