著者

釘田 慎也 馬渡 俊文 中島 晃

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2006, pp.289-290, 2006

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Using a two-roller testing machine, the authors examined the surface durability of thermally sprayed WC-Cr-Ni cermet coating under unlubricated condition. By means of the high energy type flame spraying (Hi-HVOF) method, the coating of about 110μm in thickness was formed onto the axially ground, blasted and circumferentially ground roller specimens made of a thermally refined carbon steel or a carburized and hardened steel. The WC cermet coated roller finished to a mirror-like condition with a roughness of 0.1μmRz was mated with the carburized and hardened steel roller without coating ground to a roughness of 0.1μm〜8μmRz, and a maximum Hertzian stress of P_H=1.2GPa was applied in line contact. In the case of the thermally refined steel substrate, the life to flaking became short independent of the substrate surface finish. On the other hand, the carburized hardened steel substrate roller showed a higher durability. The effect of substrate material on the durability of thermally sprayed coating was discussed by the elastic-plastic analysis of the subsurface layer.