SiC繊維を混合したAl-20%Si粉末合金の摩擦特性

抄録

This study aims to produce an aluminum alloy with excellent friction characteristics by powder metallurgical (P/M) method. Al-20%Si powder was mixed with SiC fiber of diameter 13 μm, heated to 773 K, and hot-extruded to a rod. Al-20%Si alloy without fiber was also made by the same procedure. From the rod, the friction pin with round top was made, and the friction characteristic against aluminum sheet A1050-H24 was examined. Friction pin load was changed from 9.8N to 92.7N under at speed 1 mm/s. In small pin load at no lubricant, the burning occurred in the alloy with SiC fiber but did not occur in the alloy without fiber. The friction coefficient of the alloy without fiber was smaller than that of the alloy with SiC fiber between 9.8N and 45.6N. When the pin load increased, however, the burning in the alloy with SiC fiber disappeared. Friction coefficient of the alloy with fiber decreased with increasing the pin load, but that of the alloy without fiber kept almost the same value. Finally the friction coefficient of the alloy with the fiber indicated a lower value at 92.7N than that of the alloy without fiber. Thus, we were able to indicate a possibility of producing a new friction material.