Wear Mechanisms of TiB2 and TiB2–TiSi2 at Fretting Contacts with Steel and WC–6 wt% Co

Volume 7 Issue 1, Pages 89 – 103

Golla Brahma Raju, Bikramjit Basu
Published Online: Nov 19 2008
12:59PM

DOI: 10.1111/j.1744-7402.2008.02329.x

ABSTRACT
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.

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