焼入軸受鋼の摩擦摩耗におよぼす酸化物の影響

抄録

An experimental study has been made of the influence of oxides on the friction and wear characteristics of a hardened bearing steel. Such oxides as Fe₂O₃, Fe₃O₄, FeO, CuO, Cu₂O and PbO, prepared by the sintering method, were slid against a hardened bearing steel ring of 75 mm diameter at a sliding speed of 1∼6 m/sec under an apparent pressure of 3 kg/cm². The results obtained are as follows:
Iron oxides: The coefficient of friction of Fe₂O₃ and FeO on the hardened bearing steel was high, but that of Fe₃O₄ was lower. The difference in the wear of hardened bearing steel with mating oxides was not clarified, but rubbing with Fe₃O₄ at a low speed less wore the steel. Fe₂O₃ formed a flat surface on the steel. It was observed that FeO was oxidized to Fe₂O₃ in the friction process.
Copper oxides: Cu₂O showed a high coefficient of friction and wore the steel, but formed a flat surface on it. It was found that CuO has good lubricating ability in dry friction due to the low friction and little surface damage of the steel.
Lead oxide: the coefficient of friction of PbO was low, and its change with increasing sliding speed was very small. No damage was observed on the surface of hardened bearing steel, owing to the formation of a solid film of PbO on the steel surface.