The thermal conductivity of a bulk material is obtained as the product of thermal diffusivity, specific heat capacity, and density above room temperature in many cases. There is a strong need to evaluate the thermal conductivity of coating for thermal design and use. Thermal Diffusivity Measurement for Thermal Spray Coating Attached to Substrate Using Laser Flash MethodĪkoshima, Megumi Tanaka, Takashi Endo, Satoshi Baba, Tetsuya Harada, Yoshio Kojima, Yoshitaka Kawasaki, Akira Ono, FumioĬeramic-based thermal barrier coatings are used as heat and wear shields of gas turbine blades. The uncertainty analysis showed the quantitative effect of sample geometry, transient temperature measured, and the energy of the laser pulse. The result for tellurium (Te) at 873 K: specific heat capacity 300.2 Joules per kilogram K, thermal conductivity 3.50 Watts per meter K, thermal diffusivity 2.04 x 10(exp -6) square meters per second, are within the range reported in literature. This modified method is a step forward from the standard laser flash method, which is usually used to measure thermal diffusivity of solids. A fitting procedure based on numerical simulation results and the least root-mean-square error fitting to the experimental data was used to extract the values of specific heat capacity, thermal conductivity and thermal diffusivity. The transient heat transfer process in the melt and its quartz container was numerically studied in detail. The modified method can determine thermal diffusivity, thermal conductivity, and specific heat capacity of the melt simultaneously. This study further developed standard laser flash method to measure multiple thermal properties of semiconductor melts. Lin, Bochuan Zhu, Shen Ban, Heng Li, Chao Scripa, Rosalla N. Thermal Property Measurement of Semiconductor Melt using Modified Laser Flash Method
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