Effect of Combined Additives of CaF2-Y2O3 on Microstructrue and Thermal Conductivity of AlN-BN Composite Ceramics

doi:10.3724/SP.J.1077.2008.00496

Abstract

Abstract: AlN (Aluminum nitride)-BN (Boron nitride) ceramic composites were prepared by hot-pressing in nitrogen atmosphere at 1850℃. Different contents of CaF₂ and Y₂O₃ were added as sintering additives. The effects of sintering additives and soaking time on crystalline phase, microstructure, and thermal conductivity of AlN-BN composite were explored. The experimental results show that the AlN-BN composites with combined sintering additives CaF₂-Y₂O₃ are pure AlN and BN phases, and the grain boundaries evaporate at high sintering temperature. The dielectric properties of the AlN-BN composites with combined sintering additives Y₂O₃-CaF₂ decrease little, comparing with that of the AlN-BN composites with CaF₂ additive. The thermal conductivity is increased with Y₂O₃ contents increasing in the combined sintering additives of Y₂O₃-CaF₂. When AlN-BN ceramic composites with 3wt%Y₂O₃-3wt%CaF₂ is sintered at 1850℃ for 3h, its thermal conductivity of reaches 132.7W·m^-1·K^-1.

Key words: AlN-BN, thermal conductivity, microstructure, combined sintering additive, CaF ₂-Y₂O₃

CLC Number:

TQ174

ZHAO Hai-Yang,WANG Wei-Min,FU Zheng-Yi,WANG Hao. Effect of Combined Additives of CaF₂-Y₂O₃ on Microstructrue and Thermal Conductivity of AlN-BN Composite Ceramics[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00496.

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Effect of Combined Additives of CaF₂-Y₂O₃ on Microstructrue and Thermal Conductivity of AlN-BN Composite Ceramics

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