| Budget Amount *help |
¥12,740,000 (Direct Cost: ¥9,800,000、Indirect Cost: ¥2,940,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
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| Outline of Final Research Achievements |
SiC is expected to be a new reactor material that is resistant to accidents. One of the reasons for this is the high chemical stability of SiC. However, it has been reported the neutron irradiation accelerated the corrosion in the hot water (coolant of the reactor). Therefore, we tried to clarify the mechanisms of the corrosion acceleration and to develop a corrosion-resistant surface. We have developed a system to evaluate the corrosion current in SiC, and have revealed the correlation between the corrosion current and various material parameters. The most significant finding is that the density of dangling-bonds localized at lattice defects such as vacancies showed a strong correlation with corrosion by using surface analysis such as KFM and ESR. Thus, the excessive amount of these defects introduced by irradiation was one of the main causes of the accelerated corrosion. We tried to deactivate the dangling-bonds of the irradiated SiC and demonstrated a corrosion protection.
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