Abstract
PTFE (polytetrafluoroethylene) has various unique properties such as low friction, non-adhesion, and insulation. CNF (Carbon nanofiber) is one of the promising materials to reduce the electrical resistivity of composite materials by dispersing very small amount. In this study, in order to improve the electrical resistivity and the abrasion resistance of PTFE films, we fabricated the PTFE/CNF composite films using an ultrasonic homogenizer. We quantitated the degree of dispersion of CNFs in the composite films by using fractal analysis and the effect by the difference of dispersion conditions was compared. Next, two types of friction test were carried out by using an adhesion friction tester and a ball-on-disk friction tester, and studied the effects of CNF addition on the tribological properties of PTFE/CNF composite films. As a result, we achieved the sufficient dispersion of CNFs by homogenizing for three minutes by ultrasonic. The coefficient of kinetic friction of PTFE films was not sensitive to the effect of counter materials, applied load and CNF addition. However, the specific wear rate of PTFE films decreased with CNF addition.
