421 プラズマ溶射皮膜の残留応力と密着強度測定(GS-3 マイクロ材料と計測)

概要

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Residual stress and adhesive strength in plasma sprayed coatings (NiCr alloy, CoNiCrAlY alloy, Al_2O_3 ceramics, 8mass%Y_2O_3-ZrO_2 ceramics) were measured in this study. Stress relaxation method with strain gauge was used to measure residual stress. Type 304 stainless steel and mild steel were selected for the substrate. Tension test with epoxy bond was carried out to measure adhesive strength of plasma sprayed coatings. The results obtained are summarized as follows; 1) Tensile residual stress generated in plasma sprayed coatings. 2) The value of residual stress in ceramics coatings was relatively small. 3) Residual stress in Low Pressure Plasma Sprayed (LPPS)-coating was larger than that in Atmospheric Plasma Sprayed (APS)-coating. 4) Metal alloy coatings had a larger adhesive strength than ceramics coatings.
2001-03-16