Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C
Microalloyed Mo5SiB2 alloys were fabricated by spark plasma sintering (SPS). The effects of different sintering temperatures and yttrium additions on the microstructure and high-temperature oxidation behavior of the alloys were systematically investigated. For the optimum Mo-13Si-25B-0.2Y alloy sint...
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sg-ntu-dr.10356-1644882023-07-14T16:07:31Z Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C Zhang, Chenyang Wang, Rui Pan, Kunming Yang, Yanping Wang, Changji Wei, Shizhong Dong, Xiaonan Dong, Zhili School of Materials Science and Engineering Engineering::Materials Microalloying Mo₅SiB₂ Microalloyed Mo5SiB2 alloys were fabricated by spark plasma sintering (SPS). The effects of different sintering temperatures and yttrium additions on the microstructure and high-temperature oxidation behavior of the alloys were systematically investigated. For the optimum Mo-13Si-25B-0.2Y alloy sintered at 1750 °C, adding small amounts of rare-earth yttrium refined the grains to an average size of ~400 nm without reducing the Mo5SiB2 content. During oxidation at 1300 °C, the “fishlike” Y2Si2O7 and Y2O3 phases were formed and anchored on the surface of the oxide layers, promoting the oxidation of silicon and accelerating the formation and coverage of the oxide protective film. Moreover, yttrium promoted the in situ deformation of a self-generated protective borosilicate glass film under high-temperature oxidation by accelerating Si oxidation. With prolonged oxidation time, viscous flow occurred to repair the internal cracks and tiny defects caused by the volatilization of MoO3 and prevented the inward diffusion of oxygen, as evidenced by a low oxidation rate constant of 0.95 mg2 cm−4 h−1 at 1300 °C for 50 h in the Mo-13Si-25B-0.2Y alloy. Ministry of Education (MOE) Submitted/Accepted version This work was financially supported by the National Natural Science Foundation of China (No. 51901069), the Program for Science & Technology Innovation Talents in the University of Henan Province (22HASTIT1006), the Program for Central Plains Talents (ZYYCYU202012172), and the Ministry of Education, Singapore (AcRF Tier 1, Grant No. RG70/20). 2023-01-30T02:32:26Z 2023-01-30T02:32:26Z 2022 Journal Article Zhang, C., Wang, R., Pan, K., Yang, Y., Wang, C., Wei, S., Dong, X. & Dong, Z. (2022). Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C. Materials Characterization, 189, 112001-. https://dx.doi.org/10.1016/j.matchar.2022.112001 1044-5803 https://hdl.handle.net/10356/164488 10.1016/j.matchar.2022.112001 2-s2.0-85131383294 189 112001 en RG70/20 Materials Characterization © 2022 Elsevier Inc. All rights reserved. This paper was published in Materials Characterization and is made available with permission of Elsevier Inc. application/pdf |
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Engineering::Materials Microalloying Mo₅SiB₂ Zhang, Chenyang Wang, Rui Pan, Kunming Yang, Yanping Wang, Changji Wei, Shizhong Dong, Xiaonan Dong, Zhili Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C |
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Microalloyed Mo5SiB2 alloys were fabricated by spark plasma sintering (SPS). The effects of different sintering temperatures and yttrium additions on the microstructure and high-temperature oxidation behavior of the alloys were systematically investigated. For the optimum Mo-13Si-25B-0.2Y alloy sintered at 1750 °C, adding small amounts of rare-earth yttrium refined the grains to an average size of ~400 nm without reducing the Mo5SiB2 content. During oxidation at 1300 °C, the “fishlike” Y2Si2O7 and Y2O3 phases were formed and anchored on the surface of the oxide layers, promoting the oxidation of silicon and accelerating the formation and coverage of the oxide protective film. Moreover, yttrium promoted the in situ deformation of a self-generated protective borosilicate glass film under high-temperature oxidation by accelerating Si oxidation. With prolonged oxidation time, viscous flow occurred to repair the internal cracks and tiny defects caused by the volatilization of MoO3 and prevented the inward diffusion of oxygen, as evidenced by a low oxidation rate constant of 0.95 mg2 cm−4 h−1 at 1300 °C for 50 h in the Mo-13Si-25B-0.2Y alloy. |
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School of Materials Science and Engineering |
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School of Materials Science and Engineering Zhang, Chenyang Wang, Rui Pan, Kunming Yang, Yanping Wang, Changji Wei, Shizhong Dong, Xiaonan Dong, Zhili |
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Article |
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Zhang, Chenyang Wang, Rui Pan, Kunming Yang, Yanping Wang, Changji Wei, Shizhong Dong, Xiaonan Dong, Zhili |
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Zhang, Chenyang |
title |
Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C |
title_short |
Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C |
title_full |
Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C |
title_fullStr |
Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C |
title_full_unstemmed |
Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C |
title_sort |
preparation and enhanced oxidation behavior of microalloyed mo₅sib₂ alloy at 1300 °c |
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2023 |
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https://hdl.handle.net/10356/164488 |
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1773551243191386112 |