60. The Effect of Normal Load and Sliding Frequency on the Reciprocating Friction Behavior of Nanocrystalline CuO-Based Alumina Ceramics

This investigation reports the effect of normal load and sliding frequency on the tribological performance of nanocrystalline CuO-based alumina ceramics in relation with CuO addition. Tribological studies were conducted by reciprocating a silicon nitride ball on the prepared samples in dry condition in a linear reciprocating tribotester. Reciprocating friction tests were conducted at normal loads of 0.3, 0.5, 0.7, and 1.0 kgf and the frequencies of 15, 30, 45, and 60 Hz. Coefficient of friction is influenced by the normal load and sliding frequency levels. The friction coefficient increases with increasing sliding frequency, normal load, and nano-oxide addition. The coefficient of friction sharply increases at the level of sliding frequency from 30 to 45 Hz and normal load from 500 to 700 gmf. Since coefficient of friction gradually increases with increase in CuO weight percent in the alumina matrix, it can be inferred that these materials can be used as ceramic brake or clutch.