Effect of nano-crystalline TiO₂ addition on reciprocating frictional behaviour of alumina ceramics

We report the effect of normal load and sliding frequency on the tribological performance of alumina ceramics in relation with nano-crystalline T iO ₂ addition. Tribological studies are conducted by reciprocating a silicon nitride ball on the prepared samples in dry condition in a linear reciprocating tribotester. Reciprocating friction tests are performed with sliding frequency of 15, 30, 45 and 60 Hz and at normal loads of 0.3, 0.5, 0.7 and 1.0 kg. The friction coefficient increases with increasing sliding frequency, normal load but decreases with nano titania addition. The coefficient of friction sharply increases at the level of sliding frequency from 30 Hz to 45 Hz. As the coefficient of friction gradually decreases with increase in T iO ₂ addition, it can be inferred that alumina ceramics with T iO ₂ addition upto 4 weight percent can be used as ceramic engine components, cutting tool inserts. (paper)