Development and tribological properties of SiC fibre reinforced CrB2 composite

Research output: Contribution to journalArticlepeer-review

Authors

  • J. K. Sonber
  • Murthy Tammana
  • K. Sairam
  • A. Nagraj
  • Kulwant Singh
  • And 3 others
  • R. D. Bedse
  • Sanjib Majumdar
  • Vivekanand Kain

Colleges, School and Institutes

External organisations

  • Bhabha Atomic Research Centre

Abstract

SiC fibre (SiCf) reinforced CrB2 composite was prepared by hot pressing at 1700 °C. The developed composite was characterized by microstructural characterization and mechanical property measurement. Friction and wear properties of the hot pressed CrB2 + 10%SiCf have been investigated under reciprocative sliding, using a counter body of cemented tungsten carbide (WC-Co) ball. Coefficient of friction and wear rate were established. Wear mechanism has been analysed by using optical microscopy, scanning electron microscopy-energy dispersive spectroscopy and optical profilometer techniques. Higher than 95% density was obtained by hot pressing SiCf reinforced CrB2 at 1700 °C. Fracture toughness of the developed composite was measured to be 5.4 MPa m1/2, which is 54% higher as compared to that of monolithic CrB2. The coefficient of friction (COF) was measured to be 0.33 at 20 N load and 10 Hz frequency. Specific wear rate of CrB2 + SiCf has been found to be about 10-7 mm3/N m. Tribochemical reaction is shown to be the dominant wear mechanism in the present system.

Details

Original languageEnglish
Pages (from-to)309-317
Number of pages9
JournalJournal of the Australian Ceramic Society
Volume53
Issue number2
Early online date9 Mar 2017
Publication statusPublished - 1 Oct 2017

Keywords

  • Chromium diboride, Friction, Silicon carbide fibre, Tribology, Tungsten carbide, Wear mechanism, Wear rate