耐熱性プラズマ溶射皮膜の熱サイクル特性に及ぼす基材の影響
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概要
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The authors did thermal cycle test about an Al2O3 sprayed 1%Cr-0.5%Mo steel and a 18%Cr-8%Ni steel, and compared the failure type of thermal sprayed coating in both steels. The results obtained are follows.(1) The thermal cycle fatigue life of the thermal sprayed 1%Cr-0.5%Mo steel is worse than that of the thermal sprayed 18%Cr-8%Ni steel.(2) In the case of the thermal sprayed 18%Cr-8%Ni steel that is difficult to oxidize at high temperature, while thermal cycle, a tensile stress occurs in a sprayed coating and a compressive stress occurs in a substrate. So the thermal strain occurs in the interface between the sprayed coating and the substrate. The sprayed coating delaminates when the thermal cycle reaches the limit value.(3) In the case of the thermal sprayed 1%Cr-0.5%Mo steel that is easy to oxidize at high temperature, while thermal cycle, dense oxide film occurs in the interface between the sprayed coating and the substrate, and the adhesive strength in the interface becomes small. So the sprayed coating delaminates under the lower thermal strain.
- 一般社団法人 日本溶射学会の論文