摘要
本文提出了一种用机械研磨和离子减薄技术制备透射电镜用薄膜样品的新方法,并且成功地将其应用于磨损表面氧化膜的结构分析,指出在铸铁油润滑磨损过程中于氧化磨损状态下磨损表面氧化膜系由Fe_3O_4均相所组成。
The method described in the paper has been found to pre-serv the surface investigated and yet to permit sufficient adhesion of an plating layer to allow sectioning and thinning procedures required for preparation of TEM specimens. All the preservating and thinning procedures are simple and practical.
The method has been applied to study the wear scar surface film on a cast iron specimen that had been used in a pin-disc test under oil lubrication. A block specimen had been cut from the wear scar on the disc and the specimen surface was washed with acetone to remove residual oil. A protective layer of gold approximate 200 nm thick was deposited on the wear scar surface by vacuum sputter method. The surface layer was cut by a sharp edge of a knife as some troughes so that the fresh metal of the substrate was exposed. The slot pitch between the troughes is 1 mm. A layer of nickel approximately 50 μm thick was then platted onto the block as a fixing layer which protected surface films to fall off when grounded.The block specimen was cut into the thin slices with the spark cutting machine in the vertical direction to the wear scar surface and trough. Two pieces of the slices were adhered with the edges of plating, then, grounded until 50 μm thick. Disc of 3 mm in diameter were cut from the slice. The adhered line was centered across the disk. The disk was thinned by argon ion milling a hole developed in the center region of the disk.
Using this method, lot of selected area diffraction patterns from different block specimens under oxidation wear condition were analyzed. The analysis results shown that the surface film on wear scar of cast iron under lubrication and oxidation condition mainly consists of Fe3O4 but not Fe2O3 and FeO.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
1992年第4期381-384,共4页
Tribology
关键词
氧化膜
样品
结构分析
电子显微镜
oxidic film, thin-film sample, structural analysis
