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Fe-3 mass%SiO2焼結体の高温酸化に対する水蒸気添加の影響

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J. Jpn Inst. Met. Mater. 65(2) 115.pdf1.38 MBPDFView/Open
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Title: Fe-3 mass%SiO2焼結体の高温酸化に対する水蒸気添加の影響
Other Titles: Effect of Water Vapor on the Oxidation Properties of Sintered Fe-3 mass%SiO<SUB>2</SUB> in air at 1273 K
Authors: 福本, 倫久1 Browse this author
林, 重成2 Browse this author →KAKEN DB
前田, 滋3 Browse this author
成田, 敏夫4 Browse this author
Authors(alt): Fukumoto, Michihisa1
Hayashi, Shigenari2
Maeda, Shigeru3
Narita, Toshio4
Keywords: iron
iron-silicon alloy
sintered Fe-3 mass%SiO2
high temperature oxidation
effect of water vapor
oxidation kinetics
inner layer
Issue Date: Feb-2001
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals
Volume: 65
Issue: 2
Start Page: 115
End Page: 121
Publisher DOI: 10.2320/jinstmet1952.65.2_115
Abstract: Oxidation properties of sintered Fe-3 mass%SiO2 (Fe-3SiO2) as well as Fe-1.5 mass%Si alloy (Fe-1.5Si) and Fe, for comparison, were investigated at 1273 K for up to 7.2 ks in air and air containing 10.5 vol%H2O (air-10.5H2O). In air-10.5H2O, the Fe-3SiO2 was oxidized faster than in air and also than the Fe-1.5Si in air-10.5H2O. The scale was composed of a duplex structure, an inner FeO+Fe2SiO4 and an outer Fe-oxides layers, where many voids existed in both layers. The similar scale structure containing voids was observed for the Fe-3SiO2 in air. Marker experiment with a small Pt wire was carried out for the Fe-3SiO2 oxidized in air-10.5 vol%H2O and the Pt-marker located between the inner and outer layers, suggesting that the inner layer grows due to inward migration of oxygen and the outer layer due to outward iron diffusion. In both air and air-10.5H2O Fe showed a parabolic oxidation, forming exclusively an outer Fe-oxides scale. It was suggested that SiO2, which changed to FeO+Fe2SiO4, acts as an obstacle for the outer layer recession, leading a formation of voids in the inner layer. Oxygen used to form the inner FeO+Fe2SiO4 layer was supplied by the dissociation of outer Fe-oxides, leaving voids, probably by a perforating dissociation mechanism. Both oxygen and water molecules could be diffusing species through the void.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 林 重成

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