Thermal diffusivity of silicon carbide as a reference material for laser flash apparatus
Sanghyun Lee and Dae Ho Kim
The laser flash method is very useful method as the test method for the thermal diffusivity and is used to measure over a wide temperature range. This apparatus is needed a reference material for a system check and the evaluation of uncertainty. Akoshima (AIST, Japan) was developed to the isotropic graphite (IG 110) as a reference material for laser flash apparatus. The thermal diffusivity of IG 110 is from 1.3 × 10–5 m2s–1 to 1.0 × 10–4 m2s–1 and used pilot study for CCT WG 9. The Pyroceram 9606 as BCR-724 reference material for thermal transport properties was developed by European National Metrology Institute and distributed by Institute of Reference Materials and Measurements (IRMM). The thermal diffusivity of Pyroceram 9606 is a 1.9 × 10–6 m2s–1 to 8.8 × 10–7 m2s–1 temperature range from 300 K to 1300 K. We established a laser flash system temperature range 150 K to 700 K in vacuum or inactive gas atmosphere and the development of reference material for this system. The thermal conductivity of SiC (silicon carbide) ceramics was varied by additive materials and black color is suitable to the laser flash method. The thermal diffusivity of SiC is controlled between IG 110 and Pyroceram 9606, and from 4.4 × 10–5 m2s–1.
Keywords: Expanded uncertainty, Laser flash, Reference material, Silicon carbide, Specific heat capacity, Thermal conductivity, Intrinsic Thermal diffusivity