Wear tests of materials for FBR in sodium environment (V); Differences between Colmonoy and Stellite alloys

Kano, Shigeki; not registered; Nakayama, Koichi; Hasegawa, Naruo; Koakutsu, Toru; Atsumo, Hideo; Nakasuji, Takashi

A series of experiments in sodium environment have been carried out to develop and screen the friction and wear resistant materials used for sliding components of the sodium cooled reactor. The present study relates to the friction and wear characteristics of nickel-basealloy "Colmonoy" and cobalt-base alloy "Stellite" with respect to temperature, load, sliding velocity, sliding mode and sodium flushing. Also several experiments were carried out in argon and atmospheric environments, and they were compared with those in sodium. The results obtained were as follows : (1)As the sodium temperature is raised, the kinetic friction coefficient () of Stellite alloy becomes higher, but that of colmonoy alloy remains constant or is rather lower. The of Collmonoy alloy becomes lower by 540C sodium flushing. (2)Both static friction coefficient () and of Colmonoy alloy are lower than those of Stellite alloy in sodium environment. (3)The dependence of and upon the load is low in sodium environment. In argon the dependence of upon the load is not found, while varies according to the load. (4)The friction behavior is influenced by sliding mode. The in oscillating sliding is higher than that in one-directional continuous sliding. Also the sliding surface in oscillating sliding is more roughened. (5)The dependence of upon the sliding velocity is not found in sodium environment except for that in low velocity area. (6)The kinetic friction coefficient is apt to be higher in argon than in sodium. Also the wear rate is much higher in argon.