Development of low friction coating films containing free carbon and their application to machining difficult-to-machine materials.

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In this study, some low friction coating films by Unbalanced Magnetron Sputtering(UBMS) method are developed, and are applied to high-speed milling of difficult-to-machine materials. The UBMS coated films, especially UBMS-TiCN have smoother surface without droplets and lower friction coefficient than those of any other AIP coated tools studied. The lubricating ability of the UBMS-TiCN film reduces the cutting force, cutting temperature and adhesion of chips, so that long tool life and good finished surface are obtained.