Abstract
The precise control of composition and out-diffusion/oxidation behavior of V element is the principal factor for V-containing coatings with superior mechanical and anti-wear properties at elevated temperatures. In this study, nanocomposite AlCrVSiN coatings were deposited by a hybrid deposition technique combining arc ion plating and pulsed DC magnetron sputtering. The influence of V content on the microstructure, mechanical, high-temperature tribological and oxidation properties of AlCrVSiN coatings was systematically investigated. The results showed that all the AlCrVSiN coatings exhibited a fcc-Cr(Al,V)N solid solution phase. With the increase of V content, the coating deposition rate increased from 14.0 to 25.2 nm/min, and the hardness of coatings firstly increased from 28.0 to 34.6 GPa and then decreased to 28.8 GPa. The incorporation of V into AlCrSiN coatings promoted the formation of lubricative oxides (e.g. V2O5), contributing a sharp decrease in friction coefficient of the AlCrSiN coatings from 1.0 to 0.56 and from 0.86 to 0.21 at 600 °C and 800 °C, respectively. The Al0.38Cr0.40V0.17Si0.05N and Al0.31Cr0.33V0.32Si0.04N coatings exhibited the best anti-wear property at 600 °C and 800 °C, respectively, determined by comprehensive influences of mechanical property, oxidation resistance and formation of lubricant tribofilm.
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