A study on development of rubbing technique with fine particles to form surface micro-structure and its application to friction surface

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In order to form surface micro-asperities a new device was developed, which had the rubbing mechanism of hard and fine particles between the surface and a tool. Several materials such as Al alloy, stainless steel and Cr-Mo steel were tested to examine the performance of the device and to assess both the characteristics of the surface and the tribological properties. As fine particles SiC, Si and Cr were used with Al_2O_3 particles or high speed steel particles which are both 50μm in average diameter and function as carrier particles. The experiments show that the nearly same micro-asperities as ones formed by fine particles bombardment process are formed and that modified layers made of fine particles are also generated. It is found that the modified layers with the micro-asperities possess excellent fretting properties under the lubricated condition.