転がり疲労特性に及ぼす亜鉛成膜の効果

抄録

In this study, rolling contact fatigue of a trust roller bearing consisting silicon nitride ball as rolling element and zic coated raceway was evaluated. A wet and a dry process were applied to the zinc coating: A shot peening was used for the later process and the coating surface was relatively rough. A significant increase of the rolling contact fatigue life determined from flaking was found in the wet zinc coated surface. The fatigue life of the dry coated zinc raceway also increased. It was found that residual stress was applied by the zinc peening and raceway profile became smoother after the experiment. The oxidation of the zinc coated raceway degraded. It was suggested that the restriction of the raceway oxidation resulting in the increase in the rolling contact fatigue life.