209 押込み法によるYSZ溶射皮膜の弾性係数測定と皮膜内空隙(コーティング・溶射・薄膜1)

概要

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This study reveals the specific mechanical properties (especially elastic stiffness E) of APSed YSZ coating through applying the indentation method. The spray coating has intrinsic porous-microstructure, so-called splat, and this structure may lead to be one of contributing factors in the Indentation Size Effect (ISE) that E measured by Berkovich nanoindentation shows significantly decrease with increasing of the penetration depth. In this work, Berkovich nanoindentation were performed for APSed coatings and the Pop-in event, which underestimates E values, was shown in the P-h curves. Additionally, the P-h curve for polystyrene foam by Flat-punch macro-indentation showed the "plateau" region which means the beginning of the densification of foam. The Pop-in event in some APSed coating's P-h curves may indicate that the densification of splat structure occurred. Thus, it is possible that the densification would be one of influencing factors in the ISE.
社団法人日本機械学会の論文
2007-11-16