Mechanical, Tribological, and Anti-corrosion Properties of Nitrogen-Doped AlCrNbSiTiMoW High-Entropy Coatings

W. H. Kao, Y. L. Su, Y. J. Lin

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

(AlCrNbSiTiMoW)N high-entropy alloy (HEA) coatings with various nitrogen-to-argon gas flow ratios (R N = N2/Ar) in the range of RN0 to RN1.25 were deposited on WC and Si substrates using a radio-frequency magnetron sputtering system. The as-sputtered coatings were then annealed at 950 °C for 1 hour in a vacuum. The effects of the nitrogen flow ratio on the composition, microstructure, mechanical properties, tribological properties, and corrosion resistance of the various coatings were systematically explored. The as-deposited RN0, RN1.0, and RN1.25 coatings exhibited FCC structures, while the RN0.5 and RN0.75 coatings had amorphous structures. Following the annealing process, all of the coatings showed an FCC structure. The annealing process had no significant effect on the hardness of the coatings. Thus, they were inferred to have excellent thermal stability. Among the coatings, the HRN1.0 coating showed the highest hardness (37.4 GPa), adhesion strength, and tribological properties, with a wear depth and wear rate of 0.07 μm and 0.41 × 10-6 mm3/Nm, respectively. The wear depth and wear rate of the HWC substrate were 0.28 μm and 1.67 × 10-6 mm3/Nm, respectively. Thus, compared with the HWC substrate, the HRN1.0 coating improved the wear depth and wear rate by 75.0 and 75.4%, respectively. The tribological performance of the annealed HRN1.0 coating was enhanced as a result of the formation of a greater amount of MoO3 and WO3 solid lubricant phases and a higher hardness and hardness-to-elastic modulus ratio. The RN1.0 coating exhibited the best corrosion resistance among all the coatings. The corrosion current density of the RN1.0 coating was 1.8 × 10-7 A/cm2, while that of the WC substrate was 2.2 × 10-7 A/cm2. In other words, the RN1.0 coating improved the corrosion resistance by 18.1%. However, the corrosion resistance reduced following the annealing process due to a greater surface roughness.

原文English
期刊Journal of Materials Engineering and Performance
DOIs
出版狀態Accepted/In press - 2023

All Science Journal Classification (ASJC) codes

  • 一般材料科學
  • 材料力學
  • 機械工業

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