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Open AccessArticle

Optimization of the Oxidation Behavior and Mechanical Properties by Designing the TiB2/ZrO2 Multilayers

1
College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China
2
Tianjin International Joint Research Center of Surface Technology for Energy Storage Materials, Tianjin Normal University, Tianjin 300387, China
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(10), 600; https://doi.org/10.3390/coatings9100600
Received: 31 August 2019 / Revised: 20 September 2019 / Accepted: 21 September 2019 / Published: 23 September 2019
(This article belongs to the Special Issue Advances in Multi-Target Physical Vapor Deposition Techniques)
TiB2/ZrO2 multilayers with different modulation ratios (at a fixed modulation period of 50 nm) ranging from 2:1 to 6:1 were deposited by magnetron sputtering. The oxidation behavior of the as-deposited multilayers was investigated at 600 °C in air. The microstructures, mechanical properties, and oxidation resistance of the multilayers were analyzed and compared. The results indicate that discontinuous oxidation retarded the inward diffusion of oxygen and the outward diffusion of metallic components. The formation of dense (Ti, B)-oxide scale and internally inserted ZrO2 layers in the TiB2/ZrO2 multilayers enhanced the oxidation resistance. Moreover, the oxidation resistance of the multilayers increased as modulation ratio decreased. The hardness and elastic modulus of the TiB2/ZrO2 multilayers were maximized (23.9 and 303.1 GPa, respectively) at the modulation ratio of 6:1. After annealing, the formation of thick ZrO2 layers did not lead to sustained increases in hardness. The maximum hardness and elastic modulus were obtained at the critical modulation ratio of 4:1, and good adhesion strength with the substrate was also observed. The oxidation mechanism and experimental results demonstrate that controlling the modulation ratio of multilayers can produce synergetic enhancements in the oxidation resistance and mechanical properties of multilayers after high-temperature oxidation. View Full-Text
Keywords: TiB2/ZrO2 multilayers; modulation ratio; oxidation resistance; mechanical properties TiB2/ZrO2 multilayers; modulation ratio; oxidation resistance; mechanical properties
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MDPI and ACS Style

Mao, D.; Xu, Y.; Dong, L.; Wu, J.; Zhao, M.; Li, D. Optimization of the Oxidation Behavior and Mechanical Properties by Designing the TiB2/ZrO2 Multilayers. Coatings 2019, 9, 600.

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