skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: MoSi 2 Oxidation in 670-1498 K Water Vapor

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14120· OSTI ID:1259968
 [1];  [2];  [1];  [1];
  1. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos New Mexico
  2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos New Mexico; Department of Nuclear Engineering, University of California, Berkeley, Berkeley California
+ Show Author Affiliations

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Nuclear Science and Security Consortium; Univ. of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
Grant/Contract Number:
AC52-06NA25396; NA0003180
OSTI ID:
1259968
Alternate ID(s):
OSTI ID: 1407976
Report Number(s):
LA-UR-15-26638
Journal Information:
Journal of the American Ceramic Society, Vol. 99, Issue 4; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

References (22)

New observations of MoSi2 pest at 500°C journal May 1992
Theory of the oxidation of metals journal January 1949
Reaction of Flowing Steam with Refractory Metals. 1,2 I. Molybdenum (1100-1700°) journal May 1965
Molybdenum Silicide Based Materials and Their Properties journal June 1999
The Volatilization of Molybdenum in the Presence of Water Vapor journal June 1965
The Vaporization of Molybdenum and Tungsten Oxides journal July 1958
Oxidation behaviour of a MoSi2-based composite in different atmospheres in the low temperature range (400–550 °C) journal October 2004
Pesting of the high-temperature intermetallic MoSi2 journal December 1993
High temperature oxidation of molybdenum in water vapor environments journal May 2014
Silicon Carbide Oxidation in Steam up to 2 MPa journal July 2014
Silicon Carbide Oxidation in High-Pressure Steam journal April 2013
On the oxidation behaviour of MoSi2 journal February 2001
High-Temperature Oxidation of Molybdenum Disilicide journal April 1966
Low temperature oxidation of fully dense and porous MoSi2 journal March 1999
Predicting oxide stability in high-temperature water vapor journal January 2006
Mass Spectrometric Identification of Si-O-H(g) Species from the Reaction of Silica with Water Vapor at Atmospheric Pressure journal April 1997
Kinetics of MoSi 2 pest during low-temperature oxidation journal July 1993
�ber das Molybd�nsilicid MoSi2, das Wolframsilicid WSi2 und das Tantalsilicid TaSi2 journal August 1907
Volatility of the Oxides of Tungsten and Molybdenum in the Presence of Water Vapour journal April 1949
The beneficial effect of water vapour on the oxidation at 600 and 700 °C of a MoSi2-based composite journal January 2005
Theoretical Analysis of the Diffusion Processes Determining the Oxidation Rate of Alloys journal January 1952
The vaporization of molybdenum and tungsten oxides. journal June 1960

Similar Records

Related Subjects

36 MATERIALS SCIENCE
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
MoSi₂
Nuclear Fuel Cladding
Steam Oxidation