Effects of boron addition on the high temperature oxidation of MoSi2 alloys

Zhaoying Ding; Johannes C. Brouwer; Jia Ning Zhu; Vera Popovich; Marcel J.M. Hermans; Willem G. Sloof

doi:10.1016/j.scriptamat.2023.115580

Effects of boron addition on the high temperature oxidation of MoSi₂ alloys

Zhaoying Ding, Johannes C. Brouwer, Jia Ning Zhu, Vera Popovich, Marcel J.M. Hermans, Willem G. Sloof^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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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.

Original language	English
Article number	115580
Number of pages	6
Journal	Scripta Materialia
Volume	234
DOIs	https://doi.org/10.1016/j.scriptamat.2023.115580
Publication status	Published - 2023

Keywords

Boron
Kinetics
MoSi
Oxidation

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10.1016/j.scriptamat.2023.115580

1-s2.0-S1359646223003044-mainFinal published version, 11.1 MBLicence: CC BY

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title = "Effects of boron addition on the high temperature oxidation of MoSi2 alloys",

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.",

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T1 - Effects of boron addition on the high temperature oxidation of MoSi2 alloys

AU - Ding, Zhaoying

AU - Brouwer, Johannes C.

AU - Zhu, Jia Ning

AU - Popovich, Vera

AU - Hermans, Marcel J.M.

AU - Sloof, Willem G.

PY - 2023

Y1 - 2023

N2 - 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.

AB - 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.

KW - Boron

KW - Kinetics

KW - MoSi

KW - Oxidation

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DO - 10.1016/j.scriptamat.2023.115580

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VL - 234

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 115580

ER -

Effects of boron addition on the high temperature oxidation of MoSi₂ alloys

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