抄録
An observation of sliding surfaces and a measurement of the amount of wear are generally performed in order to evaluate tribological characteristics. However, we don't know how friction and wear phenomena change between sliding surfaces during experiments. In this study, the visualization and evaluation of tribological phenomena of cast iron was attempted by using the in-situ observation and AE measurement method. Tribological phenomena of two kinds of cast irons, a flake graphite cast iron (FC) and a spheroidal graphite cast iron (FCD), were examined. It was found from the in-situ observations that the graphite inside the cast iron is extruded to the sliding surface by frictional stress. Also, the friction force and the AE signal level decreased by the effect of the extruded graphite because the graphite on the sliding surface acts as a lubricant. Since the difference in materials can be evaluated from the in-situ observation and the AE signal, this method would become a powerful tool to find out the most suitable tribo-material.
