Effects of boron addition on the high temperature oxidation of MoSi<sub>2</sub> alloys

Journal article (2023)

Authors

Z. Ding Team Marcel Hermans - Mechanical, Maritime and Materials Engineering
J.C. Brouwer Team Marcel Hermans - Mechanical, Maritime and Materials Engineering
Jia-Ning Zhu Team Vera Popovich - Mechanical, Maritime and Materials Engineering
V. Popovich Team Vera Popovich - Mechanical, Maritime and Materials Engineering
M.J.M. Hermans Team Marcel Hermans - Mechanical, Maritime and Materials Engineering
W.G. Sloof Team Joris Dik - Mechanical, Maritime and Materials Engineering
Research Group
Team Marcel Hermans (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2023 Z. Ding, J.C. Brouwer, Jia-Ning Zhu, V. Popovich, M.J.M. Hermans, W.G. Sloof
DOI
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https://doi.org/10.1016/j.scriptamat.2023.115580
Kinetics Oxidation Boron MoSi
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Published Date

2023

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Marcel Hermans

Abstract

Boron containing MoSi2 is a promising material for applications at high temperature, but the oxidation mechanism is still unclear. In this work, the high temperature (1100 °C) oxidation of B doped MoSi2 in synthetic air has been investigated. A (boro)silicate layer is formed on the surface of the alloy, which features a mixture of amorphous SiO2 and cristobalite. After an initial transient period, the oxidation kinetics follows a parabolic growth rate law. The growth rate constant of the oxide layer is enhanced by the boron in the alloy by 90 % per at.% B. The increase in growth rate is associated with boron mitigating the formation of cristobalite thereby promoting the formation of amorphous SiO2.