Friction and wear performances of WC-11Co cemented carbides sliding against different rocks

The friction and wear properties of WC-11Co cemented carbides against two kinds of granites were evaluated on the MMU-10 pin-on-disk multifunctional friction and wear tester under wet sliding condition, and the morphological analyses of the worn surface were studied by scanning electron microscope. The results show that, under the same friction condition, the friction coefficient of the cemented carbides against granite with higher hardness is lower than those of the cemented carbides against granite with lower hardness. Under the load of 700 N, the mass loss of the cemented carbides against granite with higher hardness is 4% more than that of the cemented carbides against granite with lower hardness; and under the lower load, the mass loss difference of the cemented carbides between the two friction pairs is about 12%, which indicates that rubbing-pair material has relatively decreasing influence on the wear of the cemented carbides. The main wear mechanism of the cemented carbides against granite with higher hardness is the plastic deformation of cobalt binder phase and the removals of some tungsten carbide grains, and scratching mainly occurs in the cemented carbides against granite with lower hardness. ©, 2015, Central South University. All right reserved.