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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Microstructure of oxide layers formed on zirconium alloy by air oxidation, uniform corrosion and fresh-green surface modification
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Microstructure of oxide layers formed on zirconium alloy by air oxidation, uniform corrosion and fresh-green surface modification

机译:通过空气氧化,均匀腐蚀和新鲜绿色表面改性在锆合金上形成的氧化层的微观结构

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摘要

Cladding materials with superior corrosion resistance and anti-hydrogen pickup have been developed for high burnup nuclear fuel. We have suggested a surface modification of the cladding materials for this purpose and invented a new surface modification method "Fresh-Green". The Fresh-Green treatment oxidizes and carbonizes a material surface in the same process. Zircaloy-2 with the Fresh-Green treatment showed the improvement of corrosion resistance in autoclave tests. In order to investigate the effect of surface modifications on the corrosion resistance, a synchrotron radiation experiment and a TEM observation were performed on different oxide layers formed on Zircaloy-2. The oxide layers were formed by air-oxidation, an autoclave test and the Fresh-Green treatment. Crystal structures of all the samples were transformed as Zr > Zr _3O > tetragonal ZrO _2 > monoclinic ZrO _2 from the matrix to the surface. Columnar grains of monoclinic zirconia were arranged unidirectionally in the Fresh-Green oxide layer treated at a low temperature. Diffusing capacity for oxygen influenced the crystal structure of the oxide layers.
机译:具有高耐腐蚀性和抗氢吸收性的包覆材料已经被开发用于高燃耗的核燃料。为此,我们提出了对包层材料进行表面改性的方法,并发明了一种新的表面改性方法“ Fresh-Green”。新鲜绿色处理在同一过程中氧化并碳化了材料表面。经过鲜绿色处理的Zircaloy-2在高压釜测试中显示出改善的耐腐蚀性。为了研究表面改性对耐蚀性的影响,对Zircaloy-2上形成的不同氧化物层进行了同步辐射实验和TEM观察。通过空气氧化,高压釜测试和新鲜绿色处理形成氧化物层。所有样品的晶体结构从基体到表面依次转换为Zr> Zr _3O>四方ZrO _2>单斜晶ZrO _2。单斜氧化锆的柱状晶粒单向排列在经过低温处理的Fresh-Green氧化物层中。氧气的扩散能力影响了氧化物层的晶体结构。

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