Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
12039132 | Surface and Coatings Technology | 2019 | 29 Pages |
Abstract
In this study mid-frequency pulsed-DC magnetron sputtering was used to deposit W-B-C coatings. The effect of coating composition and the deposition parameters on the structure, mechanical and tribological properties of the coatings was investigated. The broad diffraction peaks in the X-ray diffractogram indicated the amorphous to nanocrystalline nature of the coatings. The hardness of the coatings ranged from 22.6 to 26.2â¯GPa. The coatings prepared at the elevated temperature of 500â¯Â°C exhibited greater hardness compared to the coatings prepared at the ambient temperature. The amount of W in the coatings was the main parameter influencing the friction coefficient with a higher W content leading to a higher friction coefficient. The coatings prepared at 500â¯Â°C showed lower wear in tribological measurements due to their higher hardness compared to the coatings prepared at ambient temperature. The friction coefficient decreased as the testing temperature increased beyond 500â¯Â°C. XRD analyses after the high temperature tests have shown that this decrease was due to the formation of W-O Magnéli phases, which acted as a solid-state lubricant.
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Authors
S. Debnárová, P. SouÄek, P. VaÅ¡ina, L. Zábranský, V. BurÅ¡Ãková, S. Mirzaei, Y.T. Pei,