J0406-2-3 High Temperature Young's Modulus of Protective Coating by Resonant-Ultrasound Spectroscopy with Needle Transducer Tripod

Abstract

Heat resistant coatings have been used in gas turbine blades and combustors. Three points supported resonance ultrasound spectroscopy (RUS) method was expanded to high temperature measurement in order to clarify the high temperature elastic moduli of heat resistant coating. Resonance spectrum was measured up to 1073K by the equipment with induction heating and remote sensing by laser-Doppler interferometry, which was originally developed. It was found from the measurement of atmospheric plasma sprayed CoNiCrAlY coating as follows: (1) The Poisson's ratio was high if the spraying powder was large. (2) The Poisson's ratio scarcely changed by thermal treatment differently from Young's modulus.