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Report No.

Self-welding behavior of various materials in a sodium environment (V); Frictional behavior of the candidate materials for duct pad in the various environment

Mizobuchi, Shotaro*; Kano, Shigeki; Nakayama, Koichi; Namekawa, Masaru; Atsumo, Hideo

We have been tested self-welding and friction test for the material selection of the contacting and sliding parts used in Fast Breeder Reactor. In the present study, we tested some candidate materials for duct pad of the fuel-assembly in high temperature sodium, argon, and it have made the evaluation of these materials. The following results were obtained; (1)Stellite No.6 showed the stable frictional behavior in 280$$^{circ}$$C sodium, but was increased the frictional Coefficient and flushing effect in 540$$^{circ}$$C sodium. (2)Colmonoy No.6 showed the stable frictional coefficient of 0.3$$sim$$0.4 under heavy load (500Kg) or in high temperature sodium. (3)Chrome-earbide materials were observed the different frietional behavior by the finishing methods of testing surface. Frictional coefficient of Grinder finished Chrome-Carbide exceeded about 1.0, and was indicated the greater flushing effect in 540$$^{circ}$$C sodium. (4)Hard Chrome Plating showed the unstable frictional coefficient even in 280$$^{circ}$$C sodium and it indicated the high frictional coefficient of 0.8. (5)Inconel 718 showed the frictional coefficient of 0.6$$sim$$0.8, but it was observed the stable frictional behavior.



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