铀上激光辅助化学气相沉积铝薄膜研究  

Surface Modification of Uranium with Chemical Vapor Deposited Aluminum Coatings

作　　者：张永彬[1] 宾韧[1] 郎定木[2] 蒲朕 

机构地区：[1]表面物理与化学重点实验室,绵阳621907 [2]中国工程物理研究院,绵阳621900

出　　处：《真空科学与技术学报》2013年第11期1119-1123,共5页Chinese Journal of Vacuum Science and Technology

基　　金：中国工程物理研究院发展基金资助项目(20100203027)

摘　　要：为了防止金属铀的腐蚀,本文采用激光辅助化学气相沉积在铀上制备了铝薄膜。采用扫描电镜、X射线衍射、俄歇电子探针分析了薄膜的形貌、物相以及界面特性,并采用电化学极化曲线对薄膜的抗腐蚀性能分析。结果表明,无激光辐照CVD沉积铝薄膜呈微球状,激光辐照后形成了铝薄膜。激光能量低于100 mJ所形成的铝薄膜致密、平整、光滑。较高能量下,薄膜出现火山坑形貌,粗糙度增加。界面处存在UAl2以及UAl3相,且界面处铝以及铀元素成分呈梯度变化。电化学实验表明:铀上激光CVD铝具有优异的抗腐蚀性能,抗腐蚀性能的提高源于薄膜的致密性提高以及界面处形成了铀铝化合物。The surfaces of metallic uranium were modified with Al coatings,grown by laser-assisted chemical vapor deposition（ CVD）,to increase its corrosion resistance. The impacts of the deposition conditions,including the laser irradiation,laser intensity,and type of Al source,on microstructures and corrosion resistance were evaluated.The Al coatings were characterized with X-ray diffraction,scanning electron microscopy,and Auger spectroscopy.The results showed that the Al-coating significantly enhances the corrosion resistance of the U surfaces,and that the major influencing factors are laser irradiation and its intensity. For example,the laser irradiation changed the CVD Al nano-spheres into a continuous film,and a laser energy below 100 mJ resulted in the fairly uniform,smooth,and compact Al coating. High laser intensity roughened the Al surface with different defects. The corrosion resistance of the laser assisted CVD Al-coating was found to be much higher than that of the conventional CVD Al-films.

关 键 词：激光 化学气相沉积 防腐蚀 铝薄膜 

分 类 号：TG179[金属学及工艺—金属表面处理]