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 language | English |
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Pages (from-to) | 309-317 |
Number of pages | 9 |
Journal | Journal of the Australian Ceramic Society |
Volume | 53 |
Issue number | 2 |
Early online date | 9 Mar 2017 |
DOIs | |
Publication status | Published - 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