Macro- and Micro-Scale Thermal Conductivities of SiC Single Crystal and Ceramic

Ikuko Yamada; Shoichi Kume; Hiromi Nakano; Koji Watari

doi:10.4028/www.scientific.net/KEM.403.179

Paper Titles

Processing of High Performance Silicon Carbide
p.165

New Theory of Transformation Induced Grain Growth in Porous SiC
p.169

Evaluation of Microstructure of High-Strength Reaction-Sintered Silicon Carbide
p.173

Nano-Grained Microstructure Design of Silicon Carbide Ceramics by SPS Process
p.177

Macro- and Micro-Scale Thermal Conductivities of SiC Single Crystal and Ceramic
p.179

Influence of Additives on Mechanical Properties in Liquid-Phase Sintered Silicon Carbide Ceramics
p.185

Microstructural and Mechanical Properties of Ti₃SiC₂ Composites
p.189

Effect of HfO₂ Coating Films on Oxidation Resistance of SiC Ceramics
p.193

High Temperature Oxidation of SiC Powder in Oxidizing Atmosphere Containing Water Vapor
p.197

HomeKey Engineering MaterialsKey Engineering Materials Vol. 403Macro- and Micro-Scale Thermal Conductivities of...

Macro- and Micro-Scale Thermal Conductivities of SiC Single Crystal and Ceramic

Abstract:

Thermal properties of SiC at the micrometer-scale were measured quantitatively with a thermal microscope using thermo-reflectance and periodic heating techniques. In this study, SiC single crystal and polycrystal were investigated. The small values of standard deviation suggest that the SiC single crystal had constant thermal conductivities. For the single crystal, the average value of the thermal conductivity at the micrometer-scale was in good agreement with the macro-scale thermal conductivity value obtained by the laser flash technique. On the other hand, thermal conductivity of the polycrystal was heterogeneous at the micrometer-scale. An average thermal conductivity value of 257 Wm-1K-1 was obtained within an area of 50 m ×100 µm. The highest and lowest values of the thermal conductivity from the polycrystal were 300 and 220 Wm-1K-1, respectively.