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Title: Preparation and enhanced oxidation behavior of microalloyed Mo₅SiB₂ alloy at 1300 °C
Authors: Zhang, Chenyang
Wang, Rui
Pan, Kunming
Yang, Yanping
Wang, Changji
Wei, Shizhong
Dong, Xiaonan
Dong, Zhili
Keywords: Engineering::Materials
Issue Date: 2022
Source: 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-.
Project: RG70/20 
Journal: Materials Characterization 
Abstract: 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.
ISSN: 1044-5803
DOI: 10.1016/j.matchar.2022.112001
Schools: School of Materials Science and Engineering 
Rights: © 2022 Elsevier Inc. All rights reserved. This paper was published in Materials Characterization and is made available with permission of Elsevier Inc.
Fulltext Permission: embargo_20240807
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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