A versatile pin-on-disk-type friction and wear apparatus is described which permits close control of environments both in vacuo and mixed gas atmospheres. By using this apparatus, the role of dissolved oxygen in friction and wear under boundary lubrication condition was studied by sliding a OFHC copper pin against a disk of the same metal in n-hexadecane. Three types of wear curves were observed; it was found that there was a transition in wear rate as a function of oxygen content and a corresponding friction transition. This transition was temperature dependent. The wear rates at both below and above the transition were independent of temperature while the friction was sensitive to temperature. Cu2O was found in a surface film of wear debris by means of X-ray diffraction analysis in the oil saturated with oxygen gas at 120°C.
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Nakayama et al. (1980) studied this question.
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