高速炉材料のナトリウム中摩耗試験(V) コルモノイとステライトの比較

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 ($\mu$$_{k}$) of Stellite alloy becomes higher, but that of colmonoy alloy remains constant or is rather lower. The $\mu$$_{k}$ of Collmonoy alloy becomes lower by 540$^{\circ}$C sodium flushing. (2)Both static friction coefficient ($\mu$$_{s}$) and $\mu$$_{k}$ of Colmonoy alloy are lower than those of Stellite alloy in sodium environment. (3)The dependence of $\mu$$_{s}$ and $\mu$$_{k}$ upon the load is low in sodium environment. In argon the dependence of $\mu$$_{s}$ upon the load is not found, while $\mu$$_{k}$ varies according to the load. (4)The friction behavior is influenced by sliding mode. The $\mu$$_{k}$ in oscillating sliding is higher than that in one-directional continuous sliding. Also the sliding surface in oscillating sliding is more roughened. (5)The dependence of $\mu$$_{k}$ 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.