Publication details

On the significance of running-in of hard nc-TiC/a-C:H coating for short-term repeating machining

Authors

ŽEMLIČKA Radek SOUČEK Pavel VOGL Petr JÍLEK Mojmír BURŠÍKOVÁ Vilma VAŠINA Petr PEI Yutao

Year of publication 2017
Type Article in Periodical
Magazine / Source Surface & coatings technology
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1016/j.surfcoat.2017.02.020
Field Plasma physics
Keywords Tic; tribology; run-in period; machining
Description The importance of the often omitted running-in phase of tribological testing was studied on hard nc-TiC/a-C:H coating system selected as a representative of protective tribological coatings. The tribological measurements were periodically interrupted and the counterpart ball was replaced by a new one after every interrupted test to simulate machining applications, where the coatings are repeatedly in contact with a new material.The changes in the coefficient of friction and thewearrate of the counterpartball were foundtobedependent mainly on the roughness of the coating at any stage. It was found out that after substantial smoothening of the wear track of the measured coating, the coeffi cient of friction stabilized at the steady-state value attained in an uninterrupted long tribotest. This steady state value was reached at the very beginning of the test and initial instabilities in the coefficient of friction were no longer observed. It was also concluded that only after the nc-TiC/a-C:H coating gets smoothened enough within the wear track, the steady-state coefficient of friction can describe even applications where the counterpart is being periodically replaced by a new one.
Related projects:

You are running an old browser version. We recommend updating your browser to its latest version.

More info