Preparation of Al2O3/Y2O3 composite coating for deuterium permeation reduction

作者：Weijing Wang,Qinghe Yu,Xiaopeng Liu,Zheng Lu

摘要：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 radiofrequency magnetron sputtering in order to improve the tritium permeation resistance.The microstructure and the phase composition of the Al2O3/Y2O3 composite coating are observed by scanning electron microscopy,transmission electron microscopy 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 indicate that the Al2O3/Y2O3 composite coating is fully dense and the total thickness is approximately 340 nm.The Al2O3/Y2O3 coating consists of an amorphous Al2O3 and the cubic Y2O3,in which Al,Y and O elements are 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.The results show that the introduction of an interface and the existence of a tiny amount of micro-defects improve the deuterium resistance of the Al2O3/Y2O3 coating,and its deuterium permeation reduction factor is 536-750 at 873-973 K.Therefore,it is concluded that the Al2O3/Y2O3 co mposite coating as deuterium permeation barrier can significa ntly enha nce the deuterium permeation resistance property.

发文机构：National Engineering Research Center of Nonferrous Metals Materials and Products for New Energy GRIMAT Engineering Institute Co. General Research Institute for Nonferrous Metals School of Materials Science and Engineering

关键词：DEUTERIUMPermeationbarrierAl2O3coatingY2O3coatingCompositecoatingRareearths

分类号： TG1[金属学及工艺—金属学]