Tribological studies of monolithic chromium diboride against cemented tungsten carbide (WC-Co) under dry condition

摘要

Friction and wear behaviour of the hot pressed monolithic chromium diboride (CrB2) of 94% theoretical density were studied at different loads (3, 5 and 10 N) and frequencies (10 and 15 Hz) under dry reciprocative sliding condition against cemented tungsten carbide (WC-Co) ball. Coefficient of friction and wear rate were calculated. While the value of coefficient of friction (COF) is decreased from 0.50 to 0.36 with increasing load from 3 N to 10 N; it is observed to be nearly independent with respect to sliding frequency. The measured wear volume is in the range of 0.67x10(-3)-2.24x10(-3) mm(3) for the investigated regime. The lowest specific wear rate of 4.63 x 10(-7) mm(3)/N m was observed at 10 N load and 15 Hz frequency. Abrasive and tribo-oxidative wear with delamination were the active mechanisms manifested in both flat and counter body materials. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.