Unlubricated fretting wear tests on TiB2 and TiB2–5 wt%
TiSi2 ceramics against two different mating
materials (bearing grade steel and WC–6 wt% Co balls) were performed
with a view to understand the counterbody-dependent difference in
friction and wear properties. The fretting experiments were conducted
systematically by varying load (2–10 N) at an oscillating frequency of
4 Hz and 100 μm linear stroke, for a duration of 100,000 cycles.
Adhesion, abrasion, and three-body wear have been observed as mechanisms
of material damage for both the TiB2/steel and
TiB2/WC–Co tribosystems. The third body is
predominantly characterized as tribochemical layer for TiB2/steel
and loose wear debris particles for TiB2/WC–Co
tribocouple. An explanation on differences in tribological properties
has been provided in reference to the counterbody material as well as
microstructure and mechanical properties of flat materials.