共鳴超音波スペクトロスコピーによる耐熱コーティングのヤング率異方性測定

概要

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Heat resistant coatings have been used in gas turbine blades and combustors. The resonance ultrasound spectroscopy method by the needle-transducer tripod was expanded to high temperature measurement in order to clarify the all directional Young's moduli of heat resistant coatings. The resonance spectrum was measured up to 1073K by the equipment with induction heating and remote sensing by laser-Doppler interferometry, which was originally developed. Following results were obtained from the measurement of atmospheric plasma sprayed CoNiCrAlY coatings: The in-plane Young's modulus increased with a decrease in the size of spraying powder. On the contrary, the out-plane modulus decreased. It meant that the anisotropy of the elastic modulus became remarkable with a decrease in the size of spraying powder. The enhancement of Young's modulus by thermal treatment was much significant in out-plane direction than in-plane direction. Consequently, the anisotropy of the elastic modulus became insignificant and negligible in the case of the thermally treated coating with large spraying powder.
2010-02-25