Paper VII (iii) Enhancement of the Growth of Transfer Particle by the Environmental Molecules in Adhesive Wear

Zn pin is rubbed against Zn disk in SEM chamber and in various oxygen pressures. It is observed that the transfer particle grows larger in higher oxygen pressure. By the observation in SEM, it is clarified that the wear particle is the conversion of transfer particle. In another experimental rig, Cu pin is rubbed against Cu disk in Pt-Pd atmosphere. The size of wear particle is increased by the existence of this atmosphere. The inclusion of impurity atoms at the interface or in the transfer particle enhances the shear strength of them, which is the possible mechanism of the growth of transfer particle.