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The beneficial effe...
The beneficial effect of water vapour on the oxidation at 600 and 700 °C of a MoSi2-based composite
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- Hansson, Kristina, 1971 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Halvarsson, Mats, 1965 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Tang, Jun Eu, 1974 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Pompe, Robert (author)
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Sundberg, Mats, 1964 (author)
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- Svensson, Jan-Erik, 1965 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2005
- 2005
- English.
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In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. ; 25:1, s. 1-11
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Abstract
Subject headings
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- The oxidation characteristics of a MoSi2-based composite in O2 and O2+10% H2O at 600 and 700 °C were investigated. The effects of temperature and water vapour on oxidation were examined. The oxidation kinetics were studied using a thermobalance and furnace exposure, while the morphologies and compositions of the oxides were examined using XRD, ESEM/EDX, and SEM/EDX. We propose that oxidation proceeds by the initial formation of MoO3 crystals and amorphous SiO2 on the surface. The MoO3 is then evaporated; as volatile (MoO3)3 species in O2 and additional MoO2(OH)2 species in O2+10% H2O, which results in a porous, Mo-depleted oxide. However, the pores in the Mo-depleted SiO2 scale heal, and a protective crystalline scale is established eventually. The vapour pressures of the abovementioned volatile species increase with temperature and/or water vapour content in the atmosphere, which leads to accelerated Mo depletion from the oxide scale. A shorter time elapses before the oxide scale is transformed into the relatively Mo-free protective SiO2 scale, which results in less oxide being formed. Thus, the formed scale becomes thinner in O2+10% H2O than in O2. Thereby the Mo removal is beneficial when water vapour is added to the exposure atmosphere.
Subject headings
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Keyword
- SiO2
- Refractories
- Oxidation
- MoSi2
- Silicides
- Corrosion
Publication and Content Type
- art (subject category)
- ref (subject category)
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