THE RESEARCH ON SURFACE FRICTION AND WEARPROPERTIES OF THE SEMI-METALLIC FRICTION MATERIAL WITHNANO-CaCO3

摘要

The tribological properties of semi-metallic friction materials with nano-CaCO3 are studied by thecontrast experiment. The results of experiment indicate that when nano-CaCO3 powders substitute the generalCaCO3 powders in the semi-metallic friction material, the friction coefficient of this material is decreased and thewear is increased. From the SEM images together with the experimental data analysis, it is shown that while thedry powders of containing nano-CaCO3 powders are mixed, the nano-CaCO3 particles adhere to the surfaces ofother ingredients, Thus when hot molding of the mixture, the strength of resin holding other ingredients together isreduced. It induces that the steel fibers and grains are easy to disengage from the friction surface for the shearstresses. The model is set up to explain the tribological mechanism.