부산대학교 도서관

SiC fibre (SiCf) reinforced CrB2composite 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%SiCfhave 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 SiCfreinforced CrB2at 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+ SiCfhas been found to be about 10−7mm3/N m. Tribochemical reaction is shown to be the dominant wear mechanism in the present system.