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Nagraj, A.
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article
Development and tribological properties of SiC fibre reinforced CrB2 composite
Abstract
<p>SiC fibre (SiC<sub>f</sub>) reinforced CrB<sub>2</sub> 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 CrB<sub>2</sub> + 10%SiC<sub>f</sub> 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 SiC<sub>f</sub> reinforced CrB<sub>2</sub> at 1700 °C. Fracture toughness of the developed composite was measured to be 5.4 MPa m<sup>1/2</sup>, which is 54% higher as compared to that of monolithic CrB<sub>2</sub>. The coefficient of friction (COF) was measured to be 0.33 at 20 N load and 10 Hz frequency. Specific wear rate of CrB<sub>2</sub> + SiC<sub>f</sub> has been found to be about 10<sup>-7</sup> mm<sup>3</sup>/N m. Tribochemical reaction is shown to be the dominant wear mechanism in the present system.</p>