Study on Thermal Conductivity of Spark-Plasma-Sintered Silicon Nitride Ceramics

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

doi:10.4028/www.scientific.net/KEM.280-283.1259

Paper Titles

Combustion Synthesis of β-SiAlON Whiskers
p.1241

Preparation of β-SiAlON Powder at Low Temperature
p.1245

Superplastic Forming of Silicon Nitride at Low Temperature
p.1249

Effect of Microstructure on Sliding Wear of Ca α-SiAlON Ceramics
p.1253

Study on Thermal Conductivity of Spark-Plasma-Sintered Silicon Nitride Ceramics
p.1259

Effect of Cation Extraction on the Oxidation Resistance of Si₃N₄
p.1263

Polycarbosilane Conversion Bonded Porous SiC Ceramics
p.1267

Microstructure and Properties of Reaction-Formed Silicon Carbide
p.1271

Spheroid Growth during Sintering of Copper Coated Silicon Carbide Particles in the Fabrication of Nanocomposite
p.1275

HomeKey Engineering MaterialsKey Engineering Materials Vols. 280-283Study on Thermal Conductivity of...

Study on Thermal Conductivity of Spark-Plasma-Sintered Silicon Nitride Ceramics

Abstract:

In the study, the spark plasma sintering (SPS) method was adopted to fabricate Si3N4 ceramics with Y2O3-MgO additives. Specimens with different grain dimensions, grain shapes, α/β phase ratios, densities were obtained by changing the heating rate and dwell time of SPS. The relationship between the microstructure and the thermal conductivity was studied. Results show that the heating rate and the dwell time have great influence on the microstructure and properties of Si3N4 ceramics. Both equiaxed and columnar β- Si3N4 grains are formed during sintering, but the thermal conductivity of Si3N4 ceramics is affected only by columnar grains. The thermal conductivity of the ceramics increases together with the formation and the growth of the β- Si3N4 columnar grains.

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Periodical:

Key Engineering Materials (Volumes 280-283)

Pages:

1259-1262

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.280-283.1259

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Online since:

February 2007

Authors:

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

Keywords:

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

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