电真空器件镍/银镀层的中温失效分析  

Moderate-temperature failure analysis of nickel/silver coatings on the surface of electron tube

作　　者：陈虎[1] 杨卫英[1] 唐兵华[1] 彭家根[1] 

机构地区：[1]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《电镀与涂饰》2014年第24期1053-1055,共3页Electroplating & Finishing

基　　金：电真空用高速镀镍技术研究(S20140802)

摘　　要：为分析电真空器件表面Ni/Ag镀层在中温排气后失效的原因,通过模拟真实的排气过程,分别对Ni、Ni/Ag和烧结的Ni/Ag 3种试样进行氧化处理。采用热重分析仪、扫描电镜和能谱仪分析了不同试样在处理前后的增重情况、表面形貌和组成。结果表明,Ni/Ag镀层失效的主要原因是中间层镍层发生了氧化,使Ag层和Ni层之间的结合力减弱,最终使Ag层在外力作用下脱落。另外,Ag对氧的富集作用会使Ag层和Ni层之间的氧浓度增大,因此Ag对Ni层的氧化具有促进作用。To analyze the reasons of failure of Ni/Ag coatings on the surface of electron tube after exhausting at moderate temperature, three samples including Ni coating as well as Ni/Ag coatings as-plated and heat-treated were oxidized by simulating the actual exhausting process. The weight gains, surface morphologies, and compositions of different samples were analyzed using thermogravimetric analyzer, scanning electron microscope, and energydispersive spectroscope. It is shown that the main reason for failure of Ni/Ag coatings is the oxidation of nickel interlayer, which weakens the adhesion between Ag coating and Ni coating, leading to a peel-off of Ag coating under external force eventually. In addition, the oxygen content between Ag coating and Ni coating can be increased as a result of oxygen enrichment by Ag, thus Ag has an accelerating effect on the oxidation of nickel coating.

关 键 词：电真空器件 镍 银 镀层 中温失效 形貌 氧化 

分 类 号：TQ153.12[化学工程—电化学工业] TQ153.16