APPROACH TO TRIBOLOGY PROPERTIES OF THE FRICTION PAIR OF Si_3N_4 CERAMIC AND CHILLED CAST IRON

摘要

Tribology properties of the friction pair composed of silicon nitride Si_3N_4 ceramic and chilled cast iron, which will possibly be used as antiwear materials for automotive engines, are studied. In the experimental design, the method called uniform distribution is adopted to choose the reasonable values of parameters, and wear rates, wear mechanism under unlubricated condition are measured and analyzed. In addition, friction coefficients in different lubricant states are also obtained and compared. The experimental results reveal that fatigue wear is dominant to Si_3N_4 ceramic, but adhesive wear is obvious to chilled cast iron; the friction coefficients between Si-3N_4 ceramic and chilled cast iron under unlubricated condition are much bigger than lubricated condition.