MoSi 2 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 forma- tion of a passive SiO2 surface layer. However, its behavior under atmospheres where water vapor is the dominant species has received far less attention. Oxi- dation 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 at- mospheres. 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 di er from that of the air samples. Two volatile ox- ides, 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 oxida- tion (140-300 mg/cm2) was observed from 980-1084 K in water vapor, where passivation is observed in air.
- Authors:
-
- Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos New Mexico
- Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos New Mexico; Department of Nuclear Engineering, University of California, Berkeley, Berkeley California
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Nuclear Science and Security Consortium; Univ. of California, Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
- OSTI Identifier:
- 1259968
- Alternate Identifier(s):
- OSTI ID: 1407976
- Report Number(s):
- LA-UR-15-26638
Journal ID: ISSN 0002-7820
- Grant/Contract Number:
- AC52-06NA25396; NA0003180
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 4; Journal ID: ISSN 0002-7820
- Publisher:
- American Ceramic Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; MoSi₂; Nuclear Fuel Cladding; Steam Oxidation
Citation Formats
Sooby Wood, Elizabeth, Parker, Stephen S., Nelson, Andrew T., Maloy, Stuart A., and Butt, D. MoSi 2 Oxidation in 670-1498 K Water Vapor. United States: N. p., 2016.
Web. doi:10.1111/jace.14120.
Sooby Wood, Elizabeth, Parker, Stephen S., Nelson, Andrew T., Maloy, Stuart A., & Butt, D. MoSi 2 Oxidation in 670-1498 K Water Vapor. United States. https://doi.org/10.1111/jace.14120
Sooby Wood, Elizabeth, Parker, Stephen S., Nelson, Andrew T., Maloy, Stuart A., and Butt, D. Tue .
"MoSi 2 Oxidation in 670-1498 K Water Vapor". United States. https://doi.org/10.1111/jace.14120. https://www.osti.gov/servlets/purl/1259968.
@article{osti_1259968,
title = {MoSi 2 Oxidation in 670-1498 K Water Vapor},
author = {Sooby Wood, Elizabeth and Parker, Stephen S. and Nelson, Andrew T. and Maloy, Stuart A. and Butt, D.},
abstractNote = {Molybdenum disilicide (MoSi2) has well documented oxidation resistance at high temperature (T>1273 K) in dry O2 containing atmospheres due to the forma- tion of a passive SiO2 surface layer. However, its behavior under atmospheres where water vapor is the dominant species has received far less attention. Oxi- dation 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 at- mospheres. 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 di er from that of the air samples. Two volatile ox- ides, 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 oxida- tion (140-300 mg/cm2) was observed from 980-1084 K in water vapor, where passivation is observed in air.},
doi = {10.1111/jace.14120},
journal = {Journal of the American Ceramic Society},
number = 4,
volume = 99,
place = {United States},
year = {2016},
month = {3}
}
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