2012 Fiscal Year Final Research Report
The steam oxidation mechanism of heat resistant alloys and efficiency improvement of energy conversion processes at high temperature
| Project/Area Number |
21246108
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
MARUYAMA Toshio 東京工業大学, 大学院・理工学研究科, 教授 (20114895)
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| Project Period (FY) |
2009 – 2012
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| Keywords | 腐食防食 |
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| Research Abstract |
This study was planned to clarify the mechanism of steam oxidation of heat resistant alloys in energy conversion process at elevated temperatures. The effect of water vapor on high temperature oxidation is proposed based on the obtained results. The dissociated hydrogen from water vapor goes into alloys and adsorbed at the internal oxide/alloy interface, result in the enhancement of oxygen transport along the interface. Protective layer hardly forms in humid atmosphere, because internal oxidation is enhanced by the presence of water vapor. On the other hand, the comparison of the product of hydrogen permeability and thickness in both the oxide scales and metals provides the information that the effect of hydrogen permeation on oxidation behavior strongly depends on the practical operation of the power plants.
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