Oxidation features of SiOC/MoSi2 composite at low temperatures |
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Authors: | Lee Dong-Bok |
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Affiliation: | (1) Department of Advanced Materials Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, 440-746 Suwon, Korea |
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Abstract: | The oxidation behavior of SiOC containing dispersed MoSi2 particles was studied. An SiOC/MoSi2 composite was prepared by converting polymethylsiloxane into SiOC via pyrolysis after mixing MoSi2 particles. The SiOC matrix phase oxidized to SiO2, and MoSi2 particles oxidized to SiQ and MoO3. The composite displayed superior oxidation resistance at 110 0°C, because a thin SiO2 layer formed on the surface deterred the formation of highly volatile MoO3. However, accelerated oxidation occurred between 400 and 500°C owing to the concurrent formation of SiO2 and MoO3, which led to porous, nonprotective scale formation. |
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Keywords: | SiOC MoSi2 SiO2 oxidation pesting |
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