304 複合材の熱ひずみによる遮熱コーティングの線膨張係数評価法の誤差感度の検討(OS3-1 薄膜・コーティング材の機械的特性と界面強度特性)

概要

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Linear expansion coefficient of thermal barrier coating (JBC) was evaluated by a composite cylinder model. The surface strain of the model instead of an elongation was used in evaluation because of the merit of short length specimen. The sensitivity coefficient of the error in the measuring strain to the estimation of linear expansion coefficient was studied. Experimental study was also carried out on the six kinds of specimens with different sensitivities. The surface strain during cooling cycle from 850℃ to 300℃ was measured by laser speckle method. In the case of high sensitivity coefficient, reasonable estimation was not obtained. On the contrary, in the case of low sensitivity coefficient, reasonable estimation was obtained. It was confirmed that the low area of a substrate relatively to a coating was effective to decrease the sensitivity coefficient.
2010-10-09