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

doi:10.3724/SP.J.1077.2008.00099

Abstract

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

CLC Number:

TQ174
TF124

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, DOI: 10.3724/SP.J.1077.2008.00099.

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

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