Mechanical and tribological properties of nanocomposites with silicon nitride matrix with addition of 1 and 3wt.% of multilayered graphene (MLG) platelets were studied and compared to monolithic Si3N4. The wear behavior was observed by means of the ball-on-disk technique with a silicon nitride ball used as the tribological counterpart at temperatures 25°C, 300°C, 500°C, and 700°C in dry sliding. Addition of such amounts of MLG did not lower the coefficient of friction. Graphene platelets were integrated into the matrix very strongly and they did not participate in lubricating processes. The best performance at room temperature offers material with 3wt.% graphene, which has the highest wear resistance. At medium temperatures (300°C and 500°C) coefficient of friction of monolithic Si3N4 and composite with 1%MLG reduced due to oxidation. Wear resistance at high temperatures significantly decreased, at 700°C differences between the experimental materials disappeared and severe wear regime dominated in all cases.
|Number of pages||9|
|Journal||Journal of the European Ceramic Society|
|Publication status||Published - Nov 2014|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry