Nanostructured WS2–Ni composite films for improved oxidation, resistance and tribological performance
Nanostructured WS2–Ni composite films for improved oxidation, resistance and tribological performance
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DOI：
10.1016/j.apsusc.2013.09.024
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发表时间：
2014
影响因子：
6.7
通讯作者：
Shusheng Xu;Xiaoming Gao;M. Hu;Jiayi Sun;D. Jiang;Feng Zhou;Wei-min Liu;L. Weng
中科院分区：
文献类型：
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作者：
Shusheng Xu;Xiaoming Gao;M. Hu;Jiayi Sun;D. Jiang;Feng Zhou;Wei-min Liu;L. Weng
采用射频溅射法制备了WS2薄膜。为了提高复合膜的力学性能和抗氧化性能，采用X射线能谱(EDS)、X射线光电子能谱(XPS)、拉曼光谱、掠入射X射线衍射仪(GIXRD)、高分辨电子显微镜(HRTEM)、场发射扫描电子显微镜(FESEM)、纳米压痕试验机、划痕试验机和球盘摩擦试验机研究了Ni掺杂对复合膜的微观结构、抗氧化性能、力学性能和摩擦学性能的影响。WS2为纳米晶2H-WS2结构，Ni为非晶相。随着Ni含量的增加，薄膜的组织结构由纯WS2薄膜的柱状片层结构转变为低Ni含量(5.0at%)时的纤维状结构，以及高Ni含量(>；10at%)时的无特征结构。同时，薄膜变得越来越致密，并显示出更好的抗氧化能力。由于显微组织的致密化，当Ni含量在0~10.3at%之间时，薄膜的硬度有所提高，但当Ni含量高于10at%时，膜表现出较高的脆性。当镍含量在5.0at%左右时，复合膜的耐磨性比纯WS2膜好得多，但当镍含量高于10.3at%时，复合膜变脆，耐磨性较差。在湿空气中，WS2-5.0at%Ni复合薄膜的最长磨损寿命为5.8×105次，约为纯WS2薄膜的7倍。从膜层的抗氧化性、磨痕形貌和转移膜的形成等方面对磨损机理进行了探讨。
WS2films were prepared by radio frequency sputtering. In order to improve its mechanical properties and oxidation resistance, Ni was used as the dopant and the effect of Ni content on the microstructure, anti-oxidation capability, mechanical and tribological properties of composite films were studied by energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, grazing incidence X-ray diffraction (GIXRD), high resolution transmission electron microscope (HRTEM), field emission scanning electron microscopy (FESEM), nano-indentation tester, scratch tester and ball-on-disk tribometer. WS2existed in nanocrystalline 2H–WS2structure and Ni an amorphous phase. Increasing the Ni content resulted in a microstructural change from columnar platelet structure of pure WS2film to a fiber-like structure of the composite film at low Ni content (5.0 at%), and to a featureless structure at high Ni content (>10 at%). Meanwhile, the films became more and more compact and showed improved anti-oxidation capability. The films represented an increase in hardness with Ni content ranging from 0 to 10.3 at% due to the microstructure being densified, but exhibited high brittleness as the Ni content higher than 10 at%. The composite film at low Ni content of about 5.0 at% showed much better wear resistance than pure WS2film, but became brittle and had poor wear resistances at high Ni content of above 10.3 at%. The WS2–5.0 at% Ni composite film exhibited the longest wear life of 5.8 × 105cycles about sevenfold better than that of pure WS2film in humid air. The wear mechanism was discussed in terms of the anti-oxidation capability of the films, morphology of the wear track and formation of transfer film.