Development and tribological properties of SiC fibre reinforced CrB2 composite

J. K. Sonber*, Murthy Tammana, K. Sairam, A. Nagraj, Kulwant Singh, R. D. Bedse, Sanjib Majumdar, Vivekanand Kain

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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.

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

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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