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)

抄録

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.