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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 416 - 424 (9page)
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Microstructure of oxide formed on ZreNbeSn tube sample was intensively examined by scanningtransmission electron microscopy after exposure to simulated primary water chemistry conditions ofvarious concentrations of Zn (0 or 30 ppb) and dissolved hydrogen (H2) (30 or 50 cc/kg) for variousdurations without applying desirable heat flux. Microstructural analysis indicated that there was nonoticeable change in the microstructure of the oxide corresponding to water chemistry changes withinthe test duration of 100 days (pretransition stage) and no significant difference in the overall thickness ofthe oxide layer. Equiaxed grains with nano-size pores along the grain boundaries and microcracks weredominant near the water/oxide interface, regardless of water chemistry conditions. As the metal/oxideinterface was approached, the number of pores tended to decrease. However, there was no significanteffect of H2 concentration between 30 cc/kg and 50 cc/kg on the corrosion of the oxide after free immersionin water at 360 C. The adsorption of Zn on the cladding surface was observed by X-rayphotoelectron spectroscopy and detected as ZnO on the outer oxide surface. From the perspective of OHion diffusion and porosity formation, the absence of noticeable effects was discussed further
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