The influence of deposition parameters on the wear resistance of CrxNy magnetron sputtering coatings in routing of oriented strand board

• Published in: Surface & coatings technology 2003-09, Vol.174-175, p.455-460
• Main Authors: Nouveau, C., Djouadi, M.A., Decès-Petit, C.
• Format: Article
• Language: English
• ISSN: 0257-8972
• DOI: 10.1016/S0257-8972(03)00370-0

Cubic CrN coatings were deposited by magnetron sputtering onto carbide tools and tested in wood machining operations. The coatings composition was determined by Energy Dispersive Spectroscopy. SEM cross-section observations verified their morphology. The phase structure of the layers was determined by XRD analyses. In the first step, the mechanical properties of the chromium nitride coatings were characterised by hardness measurements and scratch adhesion tests. In the second step, carbide tools were tested in machining of Oriented Strand Board (OSB) up to 10 km of cutting distance using an industrial router. The tool wear was quantified by recording and analysing the cutting edge profiles at increasing cutting distances. These observations were performed using the Vertical Scanning Interferometry technique on 3D surface profiler (Wyko NT 2000). Parameters such as, the bevel width at 0.1 mm depth from the tip and the nose loss were computed for each profile. The influence of deposition conditions, such as the coatings thickness, the working pressure and the target power, on the mechanical and structural properties of coatings and the wear of the coated carbide tools was studied. It has been found that CrN coatings, obtained with a thickness of 2 *mm at working pressure of 0.2 Pa, and a target power of 650 W performed the best in OSB machining. A good agreement was observed between the tribological properties and the wear rate in wood machining tests. An influence of the layer structure was also observed: CrN crystallised with (111) and (200) orientations, performed better in OSB machining than the one presenting (200)-preferred orientation.