Wear behaviour of CrB2 + 5 wt.% MoSi2 composite against cemented tungsten carbide (WC-Co) under dry reciprocative sliding condition

Research output: Contribution to journalArticlepeer-review

Authors

  • B. Bhatt
  • Murthy Tammana
  • A. Nagaraj
  • K. Singh
  • J. K. Sonber
  • And 5 others
  • K. Sairam
  • A. Sashanka
  • G. V.S. Nageswara Rao
  • T. Srinivasa Rao
  • Vivekanand Kain

Colleges, School and Institutes

External organisations

  • National Institute of Technology Warangal
  • Bhabha Atomic Research Centre
  • National Institute of Technology Tiruchirappalli

Abstract

In the present work, reciprocative sliding wear behaviour of CrB2 + 5 wt.% MoSi2 composite was studied against WC-Co ball using different normal loads (5, 10 and 20 N) and frequencies (10, 15 Hz) under dry condition. Coefficient of friction (COF) and wear rate were measured at all test conditions. Wear mechanism was analysed by micro-structural characterization. It was found that COF is decreased from 0.68 to 0.32 with increasing load (5 to 20 N) and reciprocating frequency (10 to 15 Hz). The wear rate measured was minimum at 10 N load and 15 Hz frequency combination and was found to be 1.06 × 10-6 mm3/N m. The wear mechanisms identified during reciprocative sliding wear of CrB2 + 5 wt.% MoSi2 composite were abrasion, micro-fracture and surface tribo-oxidative reactions with delamination from tribo-zone. While abrasion with mild oxidative wear is the dominant wear mechanism at lower load (5 N) and frequency (10 Hz) combination, intensive tribo-oxidative wear was observed at higher loads (>10 N) and frequency (15 Hz).

Details

Original languageEnglish
Pages (from-to)611-625
Number of pages15
JournalJournal of the Australian Ceramic Society
Volume53
Issue number2
Early online date30 May 2017
Publication statusPublished - 1 Oct 2017

Keywords

  • Chromium diboride, Coefficient of friction, Molybdenum silicide, Reciprocative sliding wear, Wear mechanism