Preparation of Al_2O_3/Au nano-laminated composite coatings and their oxidation resistance on stainless steel  

Au/Al_2O_3层状复合纳米涂层的制备及其抗氧化性能(英文)

作　　者：高俊国[1] 陆峰[1] 汤智慧[1] 王长亮[1] 何业东[2] 

机构地区：[1]北京航空材料研究院金属腐蚀与防护研究室,北京100095 [2]北京科技大学北京市腐蚀,磨蚀与表面技术重点实验室,北京100083

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第10期2491-2497,共7页中国有色金属学报（英文版）

基　　金：Project (50771021) supported by the National Natural Science Foundation of China

摘　　要：Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employed to investigate the oxidation resistance of the composite coatings. The results revealed that the applied Al2O3/Au nano-laminated composite coatings improved the oxidation and spallation resistance of the stainless steel substrate significantly. The mechanism accounting for oxidation resistance was related with the suppression of inward oxygen diffusion and selective oxidation of Cr in the substrate. The mechanism accounting for spallation resistance was attributed to the relaxation of thermal stress by the nano-laminated structure.采用磁控溅射法成功制备Al2O3/Au层状复合纳米涂层,所制备的涂层结构致密且由Al2O3层和Au层交替组成。采用高温循环氧化实验对复合涂层在不锈钢基体上的高温抗氧化性能进行分析评价。结果表明:Al2O3/Au层状复合纳米涂层极大地改善不锈钢基体的抗氧化和抗剥落性能。其抗氧化机理与涂层能够有效地抑制氧向合金基体的扩散并促进不锈钢基体中Cr元素的选择性氧化有关;抗剥落机理可归因于复合涂层中的Au层和纳米结构的Al2O3层能够有效地松弛高温热循环过程中产生的热应力,从而提高涂层的抗剥落性能。

关 键 词：Al2O3/Au composite coatings magnetron sputtering oxidation resistance spallation resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]