2008 溶射皮膜のAE法によるはく離検出と評価(G03-2 測定・検出・評価技術(2),G03 材料力学)

概要

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AE was measured under a static tensile load for the thermally sprayed ceramic coating in order to investigate the relationship between the detected m-value and the destruction (delamination) of the sprayed coating. AE result and the result of detecting sprayed coating delamination obtained by ESPI method are compared and discussed. When the m-value approaches 1 (m→1) with a tensile load (σ≈350MPa) in a thermally sprayed coating, a horizontal crack of about 200μm was generated parallel to the coating/substrate interface. This is an effective method to detect and evaluate the delamination of a sprayed coating based on the m-value, because changes of the m-value are closely related in thermally sprayed coatings. Stress level of 355±8MPa for the delamination analyzed by AE method was almost the same as that of 364±12MPa predicted by the ESPI method. The generation of delamination was confirmed by cross-section observation of the coating using both stress levels. Therefore, the ESPI method seems to be an effective way to define and evaluate the delamination of sprayed coating determine.
社団法人日本機械学会の論文
2007-09-07