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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Main Authors: Zhang, Chenyang, Wang, Rui, Pan, Kunming, Yang, Yanping, Wang, Changji, Wei, Shizhong, Dong, Xiaonan, Dong, Zhili
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/164488
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Institution: Nanyang Technological University
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spelling 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
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
Microalloying
Mo₅SiB₂
spellingShingle 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
description 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.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Zhang, Chenyang
Wang, Rui
Pan, Kunming
Yang, Yanping
Wang, Changji
Wei, Shizhong
Dong, Xiaonan
Dong, Zhili
format Article
author Zhang, Chenyang
Wang, Rui
Pan, Kunming
Yang, Yanping
Wang, Changji
Wei, Shizhong
Dong, Xiaonan
Dong, Zhili
author_sort 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
publishDate 2023
url https://hdl.handle.net/10356/164488
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