Study on Thermal Conductivity of SPS-Sintered Si3N4 Ceramics after Heat-Treatment

Xin Lu; Xiao Shan Ning; Wei Xu; He Ping Zhou; Ke Xin Chen

doi:10.4028/www.scientific.net/MSF.475-479.1279

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HomeMaterials Science ForumMaterials Science Forum Vols. 475-479Study on Thermal Conductivity of SPS-Sintered...

Study on Thermal Conductivity of SPS-Sintered Si₃N₄ Ceramics after Heat-Treatment

Abstract:

α-Si3N4 ceramics were sintered at a low temperature of 1773K by using a spark-plasma-sintering (SPS) method with different heating rates, and then they were further heat-treated at different temperatures from 1773K to 2273K, to study the effect of the heating rate of SPS on the microstructure and the thermal conductivity of Si3N4 ceramics after the heat-treatment. Results show that the heating rate of SPS has great influence on the phase transformation and the microstructure of the β-Si3N4, but it has little influence on the thermal conductivity of the ceramics. This proves that the thermal conductivity of the ceramics does not have an obvious relationship with the ratio and the size of the columnar β-Si3N4 grain.

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Materials Science Forum (Volumes 475-479)

Pages:

1279-1282

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.1279

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Online since:

January 2005

Authors:

Xin Lu, Xiao Shan Ning, Wei Xu, He Ping Zhou, Ke Xin Chen

Keywords:

Heat Treatment, Microstructure, Spark Plasma Sintering (SPS), Thermal Conductivity (TC)

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