Oxidation behavior of Mo5SiB2-based alloy at elevated temperatures

K. Yoshimi; S. Nakatani; T. Suda; S. Hanada; H. Habazaki

doi:10.1016/S0966-9795(02)00013-4

Oxidation behavior of Mo₅SiB₂-based alloy at elevated temperatures

K. Yoshimi, S. Nakatani, T. Suda, S. Hanada, H. Habazaki

ENG - Materials Science

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

100 Citations (Scopus)

Abstract

A Mo₅SiB₂-based alloy having composition of Mo-12.3 mol% Si-24.9 mol% B was produced by arc-melting in an Ar atmosphere, and its oxidation behavior was investigated at temperature between 973 and 1673 K. At and above 1273 K, transient and steady state oxidation stages were clearly observed. The occurrence of the transient and steady state oxidation is interpreted in terms of rapid volatilization of MoO₃ and B₂O₃ under ambient O₂ pressure at the initial stage and the passive oxidation after completely sealing the substrate by silicate glass. Development of two layers onto the substrate, i.e. SiO₂ glass scale and Mo solid solution interlayer including SiO₂ dispersions, strongly supports the interpretation. Dissolution of B into the SiO₂ scale was not confirmed because of low B concentration that was under a detectable limit of EPMA and TEM-EDS. It is suggested that the SiO₂ glass scale formed on the Mo₅SiB₂-based alloy is more protective than as expected.

Original language	English
Pages (from-to)	407-414
Number of pages	8
Journal	Intermetallics
Volume	10
Issue number	5
DOIs	https://doi.org/10.1016/S0966-9795(02)00013-4
Publication status	Published - 2002 May

Keywords

A. Molybdenum silicides
B Phase identification
B. Oxidation
G. Energy systems

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/S0966-9795(02)00013-4

Cite this

@article{610db32490a9432f8294cd2fd4a94062,

title = "Oxidation behavior of Mo5SiB2-based alloy at elevated temperatures",

abstract = "A Mo5SiB2-based alloy having composition of Mo-12.3 mol% Si-24.9 mol% B was produced by arc-melting in an Ar atmosphere, and its oxidation behavior was investigated at temperature between 973 and 1673 K. At and above 1273 K, transient and steady state oxidation stages were clearly observed. The occurrence of the transient and steady state oxidation is interpreted in terms of rapid volatilization of MoO3 and B2O3 under ambient O2 pressure at the initial stage and the passive oxidation after completely sealing the substrate by silicate glass. Development of two layers onto the substrate, i.e. SiO2 glass scale and Mo solid solution interlayer including SiO2 dispersions, strongly supports the interpretation. Dissolution of B into the SiO2 scale was not confirmed because of low B concentration that was under a detectable limit of EPMA and TEM-EDS. It is suggested that the SiO2 glass scale formed on the Mo5SiB2-based alloy is more protective than as expected.",

keywords = "A. Molybdenum silicides, B Phase identification, B. Oxidation, G. Energy systems",

author = "K. Yoshimi and S. Nakatani and T. Suda and S. Hanada and H. Habazaki",

note = "Funding Information: The authors would like to thank Mr. E. Aoyagi, Y. Hayasaka and Y. Murakami of Institute for Materials Research, Tohoku University, for their technical assistance. This work was supported by a Grant-in-Aid for Science Research on Priority Area (No. 11221202) from the Ministry of Education, Science and Culture of Japan.",

year = "2002",

month = may,

doi = "10.1016/S0966-9795(02)00013-4",

language = "English",

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pages = "407--414",

journal = "Intermetallics",

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T1 - Oxidation behavior of Mo5SiB2-based alloy at elevated temperatures

AU - Yoshimi, K.

AU - Nakatani, S.

AU - Suda, T.

AU - Hanada, S.

AU - Habazaki, H.

N1 - Funding Information: The authors would like to thank Mr. E. Aoyagi, Y. Hayasaka and Y. Murakami of Institute for Materials Research, Tohoku University, for their technical assistance. This work was supported by a Grant-in-Aid for Science Research on Priority Area (No. 11221202) from the Ministry of Education, Science and Culture of Japan.

PY - 2002/5

Y1 - 2002/5

N2 - A Mo5SiB2-based alloy having composition of Mo-12.3 mol% Si-24.9 mol% B was produced by arc-melting in an Ar atmosphere, and its oxidation behavior was investigated at temperature between 973 and 1673 K. At and above 1273 K, transient and steady state oxidation stages were clearly observed. The occurrence of the transient and steady state oxidation is interpreted in terms of rapid volatilization of MoO3 and B2O3 under ambient O2 pressure at the initial stage and the passive oxidation after completely sealing the substrate by silicate glass. Development of two layers onto the substrate, i.e. SiO2 glass scale and Mo solid solution interlayer including SiO2 dispersions, strongly supports the interpretation. Dissolution of B into the SiO2 scale was not confirmed because of low B concentration that was under a detectable limit of EPMA and TEM-EDS. It is suggested that the SiO2 glass scale formed on the Mo5SiB2-based alloy is more protective than as expected.

AB - A Mo5SiB2-based alloy having composition of Mo-12.3 mol% Si-24.9 mol% B was produced by arc-melting in an Ar atmosphere, and its oxidation behavior was investigated at temperature between 973 and 1673 K. At and above 1273 K, transient and steady state oxidation stages were clearly observed. The occurrence of the transient and steady state oxidation is interpreted in terms of rapid volatilization of MoO3 and B2O3 under ambient O2 pressure at the initial stage and the passive oxidation after completely sealing the substrate by silicate glass. Development of two layers onto the substrate, i.e. SiO2 glass scale and Mo solid solution interlayer including SiO2 dispersions, strongly supports the interpretation. Dissolution of B into the SiO2 scale was not confirmed because of low B concentration that was under a detectable limit of EPMA and TEM-EDS. It is suggested that the SiO2 glass scale formed on the Mo5SiB2-based alloy is more protective than as expected.

KW - A. Molybdenum silicides

KW - B Phase identification

KW - B. Oxidation

KW - G. Energy systems

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