Determination of Thermal Diffusivity of Ceramics Coating by Flash Method(Physics, Process, Instrument & Measurement)

概要

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The laser flash method is extended for measuring the thermal diffusivity of sprayed coatings. A flash pulse is absorbed in the front surface of a thermally insulated spacemen, which is composed of a ceramics coating layer and the substrate. The resulting temperature history of the rear face, or the surface of the ceramics coating is measured by a radiation thermometer and recorded with a transient memory and a pen-recorder. The time required for the temperature to rise 30 and 70 percents, for example, of the maximum temperature rise is read from the temperature versus time curve. These results are used for the numerical computation based on the theoretical equation of the normalized temperature increase on the rear face and the method of bisection. The thermal resistance at the interlayer surface can be also obtained easily as well as the thermal diffusivity. The present method is applied to five kinds of thermal sprayed ceramics coatings, and the effectiveness of this method is confirmed.
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