Abstract A tritium permeation barrier is required in fusion blankets for the reduction of fuel loss and radiological hazard. In this study, an Al2O3/Y2O3 composite coating was prepared on 316 L stainless steel by radio-frequency magnetron sputtering in order to improve the tritium permeation resistance. The microstructure and the phase composition of the Al2O3/Y2O3 composite coating were observed by scanning electron microscope, transmission electron microscope and grazing incidence X-ray diffraction. Moreover, Auger electron spectroscopy was used to characterize the depth profiles of Al, Y and O elements. The results clearly indicated that the Al2O3/Y2O3 composite coating was fully dense and the total thickness was approximately 340 nm. The Al2O3/Y2O3 coating consisted of an amorphous Al2O3 and the cubic Y2O3, which the Al, Y and O elements were homogeneously distributed in the vertical base direction. Furthermore, the deuterium permeation property of the Al2O3/Y2O3 composite coating was measured by the gas phase permeation method, where the results showed that the introduction of an interface and the existence of a tiny amount of micro-defects improved the deuterium resistance of the Al2O3/Y2O3 coating, where its deuterium permeation reduction factor was 536–750 at 873–973 K. Therefore, it was concluded that the Al2O3/Y2O3 composite coating as deuterium permeation barrier can significantly enhance the deuterium permeation resistance property.

中文翻译：

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用于降低氘渗透的Al2O3/Y2O3复合涂层的制备

摘要 聚变毯中需要氚渗透屏障，以减少燃料损失和放射性危害。本研究通过射频磁控溅射在 316 L 不锈钢上制备了 Al2O3/Y2O3 复合涂层，以提高抗氚渗透性。采用扫描电镜、透射电镜和掠入射X射线衍射对Al2O3/Y2O3复合涂层的微观结构和相组成进行了观察。此外，俄歇电子能谱用于表征 Al、Y 和 O 元素的深度分布。结果清楚地表明，Al2O3/Y2O3 复合涂层完全致密，总厚度约为 340 nm。Al2O3/Y2O3 涂层由无定形 Al2O3 和立方 Y2O3 组成，Al、Y和O元素在垂直基方向上均匀分布。此外，采用气相渗透法测量了Al2O3/Y2O3复合涂层的氘渗透性能，结果表明界面的引入和微量缺陷的存在提高了Al2O3的耐氘性。 /Y2O3 涂层，其氘渗透降低系数在 873-973 K 时为 536-750。因此，可以得出结论，Al2O3/Y2O3 复合涂层作为氘渗透屏障可以显着提高耐氘渗透性能。