Abstract
TiN–MoS x coatings have been produced using a hybrid reactive arc (TiN) and magnetron sputter (MoS x ) deposition process. The process allowed a maximum total Mo and S incorporation of 8 at.%. The coatings displayed a cubic TiN structure with slightly enlarged lattice constants . By suitable process parameter control, coatings of high adhesion on hardmetal and HSS substrates were produced. Hardness values of up to 30 GPa and friction coefficients against steel and Al 2 O 3 of less than 0.2 were obtained for the TiN + 8 mol% MoS x coatings. To determine the suitability of such coatings for use in dry machining, the lifetime of coated drills used in lubrication-free conditions was measured. A comparison of the best performing drills showed the TiN + 8 mol% MoS x coating to increase the lifetime by almost twofold with respect to the TiN coating and up to fivefold with respect to an uncoated drill.
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