PM specific methods for recycling the fine and ultra-fine machining chips

Abstract

The paper presents a simple method to recycle the bearing steel scrap in view to recover the solid part and to use it as additive in sintered friction materials. The method consists of treating and removing of oils, water and surface oxide film. The recovered powders consist of a mixture of metallic and nonmetallic particles. The amount and the chemical composition of the non-metallic part vary with the type and the quality of the grinding wheel. The recovered powder mix was used as such or in the composition of some friction materials, in a proportion of 80 wt%. The obtained results suggest the recovered powders can be used in the following fields: 1) metallic parts as limit-switcher or spacers; 2) sintered friction materials; 3) friction additive for the organic matrix friction materials.