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Journal of Inorganic Materials

Journal of Inorganic Materials >

2008 , Vol. 23 >Issue 1: 99 - 103

DOI: https://doi.org/10.3724/SP.J.1077.2008.00099

Research Paper

Effect of CaF2 on AlN-BN Ceramic Composites by Hot-pressing

  • ZHAO Hai-Yang ,
  • WANG Wei-Min ,
  • FU Zheng-Yi ,
  • WANG Hao
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  • (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China)

Received date: 2006-12-31

  Revised date: 2007-03-26

  Online published: 2008-01-20

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Abstract

A series of samples of AlN-BN ceramic composites with different contents of sintering additives　CaF2(0-4wt%) were prepared by hot-pressing in nitrogen atmosphere at 1850℃ for 3h. The effects of sintering additives on densification, dielectric properties and thermal conductivity of AlN-BN composites were explored. The addition of CaF2 results in improvements in the level of densification and purified the grain boundary. AlN-BN composites with relative density of 98.53%-98.54% are obtained when CaF2 contents are 3wt%-4wt%. Dielectric constants of samples are between 7.29 and 7.60 and the best tanδ value is 6.28×10-4. It is found that dielectric constants increase with the increasing CaF2 contents and depend on the density of
the AlN-BN ceramic composites. The highest thermal conductivity reach 110W·m-1·K-1 by adding 3wt% CaF2.

Key words： AlN-BN; dielectric properties; thermal conductivity; ceramic composites

Cite this article

ZHAO Hai-Yang , WANG Wei-Min , FU Zheng-Yi , WANG Hao . Effect of CaF2 on AlN-BN Ceramic Composites by Hot-pressing[J]. Journal of Inorganic Materials, 2008 , 23(1) : 99 -103 . DOI: 10.3724/SP.J.1077.2008.00099

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