MoSi2 Oxidation in 670-1498 K Water Vapor

Elizabeth Sooby Wood; Stephen S. Parker; Andrew T. Nelson; Stuart A. Maloy

doi:10.1111/jace.14120

MoSi₂ Oxidation in 670-1498 K Water Vapor

Elizabeth Sooby Wood, Stephen S. Parker, Andrew T. Nelson, Stuart A. Maloy

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22 Scopus citations

Abstract

Molybdenum disilicide (MoSi₂) has well documented oxidation resistance at high temperature (T > 1273 K) in dry O₂ containing atmospheres due to the formation of a passive SiO₂ surface layer. However, its behavior under atmospheres where water vapor is the dominant species has received far less attention. Oxidation testing of MoSi₂ was performed at temperatures ranging from 670-1498 K in both 75% water vapor and synthetic air (Ar-O₂, 80%-20%) containing atmospheres. Here the thermogravimetric and microscopy data describing these phenomena are presented. Over the temperature range investigated, MoSi₂ displays more mass gain in water vapor than in air. The oxidation kinetics observed in water vapor differ from that of the air samples. Two volatile oxides, MoO₂(OH)₂ and Si(OH)₄, are thought to be the species responsible for the varied kinetics, at 670-877 K and at 1498 K, respectively. Increased oxidation (140-300 mg/cm²) was observed from 980-1084 K in water vapor, where passivation is observed in air.

Original language	English
Pages (from-to)	1412-1419
Number of pages	8
Journal	Journal of the American Ceramic Society
Volume	99
Issue number	4
DOIs	https://doi.org/10.1111/jace.14120
State	Published - Apr 1 2016
Externally published	Yes

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© 2016 The American Ceramic Society.

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10.1111/jace.14120

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title = "MoSi2 Oxidation in 670-1498 K Water Vapor",

abstract = "Molybdenum disilicide (MoSi2) has well documented oxidation resistance at high temperature (T > 1273 K) in dry O2 containing atmospheres due to the formation of a passive SiO2 surface layer. However, its behavior under atmospheres where water vapor is the dominant species has received far less attention. Oxidation testing of MoSi2 was performed at temperatures ranging from 670-1498 K in both 75% water vapor and synthetic air (Ar-O2, 80%-20%) containing atmospheres. Here the thermogravimetric and microscopy data describing these phenomena are presented. Over the temperature range investigated, MoSi2 displays more mass gain in water vapor than in air. The oxidation kinetics observed in water vapor differ from that of the air samples. Two volatile oxides, MoO2(OH)2 and Si(OH)4, are thought to be the species responsible for the varied kinetics, at 670-877 K and at 1498 K, respectively. Increased oxidation (140-300 mg/cm2) was observed from 980-1084 K in water vapor, where passivation is observed in air.",

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AU - Parker, Stephen S.

AU - Nelson, Andrew T.

AU - Maloy, Stuart A.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - Molybdenum disilicide (MoSi2) has well documented oxidation resistance at high temperature (T > 1273 K) in dry O2 containing atmospheres due to the formation of a passive SiO2 surface layer. However, its behavior under atmospheres where water vapor is the dominant species has received far less attention. Oxidation testing of MoSi2 was performed at temperatures ranging from 670-1498 K in both 75% water vapor and synthetic air (Ar-O2, 80%-20%) containing atmospheres. Here the thermogravimetric and microscopy data describing these phenomena are presented. Over the temperature range investigated, MoSi2 displays more mass gain in water vapor than in air. The oxidation kinetics observed in water vapor differ from that of the air samples. Two volatile oxides, MoO2(OH)2 and Si(OH)4, are thought to be the species responsible for the varied kinetics, at 670-877 K and at 1498 K, respectively. Increased oxidation (140-300 mg/cm2) was observed from 980-1084 K in water vapor, where passivation is observed in air.

AB - Molybdenum disilicide (MoSi2) has well documented oxidation resistance at high temperature (T > 1273 K) in dry O2 containing atmospheres due to the formation of a passive SiO2 surface layer. However, its behavior under atmospheres where water vapor is the dominant species has received far less attention. Oxidation testing of MoSi2 was performed at temperatures ranging from 670-1498 K in both 75% water vapor and synthetic air (Ar-O2, 80%-20%) containing atmospheres. Here the thermogravimetric and microscopy data describing these phenomena are presented. Over the temperature range investigated, MoSi2 displays more mass gain in water vapor than in air. The oxidation kinetics observed in water vapor differ from that of the air samples. Two volatile oxides, MoO2(OH)2 and Si(OH)4, are thought to be the species responsible for the varied kinetics, at 670-877 K and at 1498 K, respectively. Increased oxidation (140-300 mg/cm2) was observed from 980-1084 K in water vapor, where passivation is observed in air.

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MoSi₂ Oxidation in 670-1498 K Water Vapor

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