微弧氧化制备氧化铝阻氚涂层的研究（英文）  

Preparation and Properties of Alumina Coatings as Tritium Permeation Barrier by Plasma Electrolytic Oxidation

作　　者：冯军[1,2] 但敏[1] 金凡亚[1] 陈美艳[1] 沈丽如[1] 童洪辉[1] 张桂凯[3] 

机构地区：[1]核工业西南物理研究院,四川成都610041 [2]南华大学,湖南衡阳421001 [3]中国工程物理研究院,四川绵阳621907

出　　处：《稀有金属材料与工程》2016年第2期315-320,共6页Rare Metal Materials and Engineering

基　　金：International Thermonuclear Experimental Reactor Foundation of China(2013GB110006);National Natural Science Foundation of China(11305054,11305055)

摘　　要：采用微弧氧化技术在316L不锈钢基体上制备了氧化铝阻氚涂层,利用XRD、SEM、涡流法对涂层进行了相结构、表面形貌、膜厚的分析,并进行了划痕实验、抗热震性能及阻氚性能测试。结果表明:相结构、表面形貌、膜厚受到微弧氧化电流密度、电压、反应时间的影响。其中,电流密度、电压都能改变涂层相结构,较高电流密度将促进Al→Al_2O_3的形成,而较高电压将促进γ-Al_2O_3→α-Al_2O_3的相变。提高电压、反应时间,涂层表面放电孔洞将变大从而影响表面质量;最佳电流密度为9 A/dm^2,此时表面质量较好。通过性能测试及综合分析,最佳工艺参数为6 A/dm^2、300 V、30 min,膜基结合力、抗热震较好,能使316L不锈钢的氚渗透率降低3个数量级。The alumina coatings as tritium permeation barrier were deposited on 316 L stainless steel substrates by plasma electrolytic oxidation.The effects of plasma electrolytic oxidation on the coatings were investigated,and phase,surface morphology and thickness were characterized by XRD,SEM and eddy current method,respectively.After scratch adhesion test,thermal shock resistance test and tritium permeability test,the optimized coatings were obtained.The results show that the phase,the surface morphology and the thickness are affected by current density,voltage and PEO（plasma electrolytic oxidation） duration time.The current density and voltage can change the phase structure of coatings,higher current density propels the transformation of Al→Al2O3 and higher voltage propels the transformation of γ-Al2O3→α-Al2O3.With increasing voltage and duration time,the pore size becomes bigger and the quantity is less so that the surface morphology is worse.With current density increasing to appropriate value（9 A/dm^2）,surface morphology becomes good.After a series of tests,the coatings,which are obtained at 6 A/dm^2,300 V,30 min,exhibit good performances with good film-substrate cohesion,thermal shock resistance,and the tritium permeation resistance of coated sample is improved by 3 orders of magnitude higher than that of the 316 L stainless steel bulk.

关 键 词：氧化铝涂层 阻氚 微弧氧化 

分 类 号：TG174.4[金属学及工艺—金属表面处理]