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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 6    December 2003

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Tribological properties of 2024 aluminum alloy plasma-based ion implanted with 
nitrogen then titanium
LIAO Jia-xuan(廖家轩)1,2, XIA Li-fang(夏立芳)1, SUN Ming-ren(孙明仁)1
SUN Yue(孙 跃)1, LIU Wei-min(刘维民)2
XU Tao(徐 洮)

1.School of Materials Science and Engineering, 
Harbin Institute of Technology, Harbin 150001, China;
2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, the Chinese Academy of Sciences, Lanzhou 730000, China

Abstract:2024 aluminum alloy was implanted with nitrogen then titanium at different titanium target sputtering currents by plasma-based ion implantation(PBII). The appearances were observed by atomic force microscope, and the surface hardness was measured with Knoop hardness tester and the mechanical property microprobe. Ball-on-disc dry wear experiments were performed under ambient air conditions, to study the tribological properties of the modified layers against GCr15 steel ball, employing various loads and a constant sliding speed. After dual modifications, surface hardness at 100nm depth could reach to 9GPa, increasing by about 5 times; tribological properties at lower load(e.g. 1N) were obviously improved, with the friction coefficient(below 0.2) decreasing by over 60%, and the wear life(800 times) increasing by about 5 times. Meanwhile, with the increase of the sputtering current, the appearance is smooth, the surface hardness tends to a slow and even variation, the wear life presents a parabola-like change, and the friction coefficient and the adhesive wear degree decrease. However, tribological properties are reduced with the increase of the load due to the modified layer rapidly getting thin. 

 

Key words:   aluminum alloy; plasma-based ion implantation; sputtering current; tribological properties

ISSN 1672-7029
CN 43-1423/U

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