Thermal Diffusivity Measurement of Thin Thermal-sprayed Coatings
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Abstract
This thesis presents a method to determine the thermal diffusivity of both single-layered and two-layered coated samples. The flame spraying, air plasma spraying, and cold spraying techniques were used to fabricate the two-layered samples. Mathematical models were developed for single-layered and two-layered conduction heat transfer problems. Experiments were designed and tests were conducted to ensure that the mathematical models could give good prediction with the correct input of thermal diffusivity value. Experiments were conducted on samples, including single-layered samples of copper, aluminum, PMMA, and Pyrex and two-layered samples of TiO2 coating on copper substrate or low carbon steel substrate, YSZ coating on low carbon steel substrate, and nano-structured TiO2 on Pyrex substrate. The thermal diffusivity results of all the materials showed good repeatability and for low-thermal diffusivity materials, the test results agreed with the referenced value.