1995 Fiscal Year Final Research Report Summary
Formation of Protective Oxide Scale with High Electrical Conductivity by High Temperature Oxidation of Alloys.
| Project/Area Number |
06453084
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
MARUYAMA Toshio Tokyo Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20114895)
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| Co-Investigator(Kenkyū-buntansha) |
NANKO Makoto Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (90272666)
SUSA Masahiro Tokyo Institute of Technology, Faculty fo Engineering, Associate Professor, 工学部, 助教授 (90187691)
NAGATA Kazuhiro Tokyo Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (70114882)
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| Project Period (FY) |
1994 – 1995
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| Keywords | High Temperature oxidation / Highly conductive oxide scale / Sr-Cr-O system / Phase diagram / Standard Gibbs energy of formation |
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| Research Abstract |
The highly conductive Cr_2O_3 scale was successfully obtained by high temperature oxidation of Cr_2O_3 formig alloys coated with (La, Sr) CoO_3. Microstructural analysis on the scale found that the Sr-Cr-Oxides precipitated in the scale and that the precipitates probably connected each other. The oxides are SrCrO_4, Sr_3Cr_2O_8, Sr_3Cr_2O_7, Sr_2CrO_4. The electrical conductivity of thses oxides were much larger than that of Cr_2O_3. To estimate the distribution of these oxides in the scale, the phase diagram in Sr-Cr-O system was constructed and the standard Gibbs energy of formation of these oxides weredetermined. These results are applicable to the design of the alloy separator in solid oxide fuel cell.
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