Hydrogen permeation properties of CrxCy@Cr2O3/Al2O3 composite coating derived from selective oxidation of a Cr-C alloy and atomic layer deposition
Hydrogen permeation properties of CrxCy@Cr2O3/Al2O3 composite coating derived from selective oxidation of a Cr-C alloy and atomic layer deposition
复制标题
Cr-C合金选择性氧化和原子层沉积CrxCy@Cr2O3/Al2O3复合涂层的氢渗透性能
DOI：
10.1016/j.ijhydene.2018.08.192
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发表时间：
2018
影响因子：
7.2
通讯作者：
Zhang Zhengjun
中科院分区：
文献类型：
--
作者：
Wang Jipeng;Lu Zhaoxia;Ling Yunhan;Wang Rongguang;Li Yunhui;Zhou Qingyun;Zhang Zhengjun
金属氧化物和碳化物是聚变反应堆中很有前途的防氚渗透涂层。然而，涂层和基底之间的热机械失配在制造和操作期间对其界面的完整性构成威胁。为了解决这一问题，采用脉冲电化学沉积技术在不锈钢基体上制备了致密均匀的Cr-单键-C非晶合金涂层，并在涂层中引入了金属层间涂层和选择性氧化。通过控制氧化转化和原子层沉积，制备了CrxCy@Cr2O3/Al 2 O3复合涂层。分析比较了300 °C氢暴露前后薄膜的物相、形貌、化学状态和缺陷。结果表明，这种基于碳化物钉扎氧化铬晶界和氧化铝修复缺陷原理的新型复合涂层，可显著提高材料的阻氢性能。
Metal oxides and carbides are promising tritium permeation barrier coatings for fusion reactors. However, the thermomechanical mismatch between the coating and substrate poses a threat to their interface's integrity during fabrication and operation. To address this issue, a metallic interlayer coating was introduced followed by selective oxidation in which a compact and uniform Crsingle bondC amorphous alloy coating was successfully deposited on the stainless steel substrate by pulsed electrochemical deposition. A new composite coating of CrxCy@Cr2O3/Al2O3was formed by subsequent controlled oxidation conversion and atomic layer deposition. The phase, morphology, chemical state and defects of the films were analyzed and compared both before and after hydrogen exposure at 300 °C. The results show that this new kind of composite coating, based on the principles of grain boundary pinning of chromic oxide with carbide and defect healing of alumina, can remarkably improve the hydrogen permeation barrier performance of these materials.