Abstract
In this work, AlCrON coatings with various oxygen contents were deposited by multi-arc-ion plating technology. The effects of oxygen content on the microstructure, mechanical properties, wear and cutting performance of AlCrON coatings were investigated. The result showed that the O contents in the AlCrON coatings increased from 0 to 8.8 wt.% by changing the O2/N2 flow ratios during the deposition process. The AlCrON coatings mainly included fcc-CrN and fcc-AlN phases, and the Al2O3 and Cr2O3 were also confirmed by the XPS results. Addition of oxygen improved the adhesion strength of AlCrON coatings. The AlCrON coating with 4.0 wt.% oxygen content showed the low surface roughness, low friction coefficient and the minimum wear rate. Cutting results also showed that addition of oxygen improved the service life of AlCrON coatings under various cutting conditions. The service life of AlCrON coatings increased firstly and then decreased with increasing oxygen contents, and the AlCrON coating with 4.0 wt.% oxygen content had the maximum cutting length under various cutting conditions, which might be due to the decrease of surface roughness, increase of adhesion strength and hardness. The wear mechanism involved in cutting process included abrasive wear, adhesive wear and oxidation wear.
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