期刊
CERAMICS INTERNATIONAL
卷 38, 期 5, 页码 4363-4367出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.01.006
关键词
Mechanical properties; Dielectric properties; Si3N4; CaHPO4
资金
- Yangtze Scholars Program in China
- National Natural Science Foundation of China (NSFC) [51021002]
The phase composition, relative density, mechanical properties and dielectric properties of silicon nitride porous ceramics with different content of CaHPO4 as an additive prepared by gelcasting method were investigated. The addition of CaHPO4 can improve the sintering ability and the phase transformation from alpha-Si3N4 to beta-Si3N4, so the relative density and beta-Si3N4 content both increase with the increase of CaHPO4 content. As a result, when the CaHPO4 addition content is 15 wt.%, the flexural strength, elastic modulus, fracture toughness of Si3N4 ceramic reach to 365.1 MPa, 107.9 GPa and 3.82 MPa m(1/2), respectively. The dielectric constant of Si3N4 ceramics increases with the increase of CaHPO4 addition content due to the increase of relative density and the relative content of beta-Si3N4. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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