Microstructure and Tribological Properties of Plasma Nitriding Cast CoCrMo Alloy

被引：27
作者：
Wang, Qingliang [1 ]
Huang, Chuanhui [2 ]
Zhang, Lei [1 ]
机构：
[1] School of Material Science and Engineering, China University of Mining and Technology
[2] College of Electro-mechanical Engineering, Xuzhou Institute of Technology
来源：
Journal of Materials Science and Technology | 2012年 / 28卷 / 01期
关键词：
CoCrMo alloy; Microstructure; Plasma nitriding; Tribology;
D O I：
10.1016/S1005-0302(12)60024-3
中图分类号：
学科分类号：
摘要：
A medical cast CoCrMo alloy was coated by plasma nitriding process to enhance the wear resistance. The microstructures, phases and micro-hardness of nitrided layers were investigated by atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness. Tribological properties were investigated on a pin-on-disc wear tester under 25% bovine serum solutions. The experimental results showed that plasma nitriding was a promising process to produce thick, hard and wear resistant layers on the surface of CoCrMo alloy. The harder CrN and Cr 2N phases formed on the plasma nitrided layer with the compact nano-crystalline structure. Compared with the untreated sample, all nitrided samples showed the lower wear rates and higher wear resistance at different applied loads and nitriding temperatures. It was concluded that the improvement of wear resistance could be ascribed to the formation of thicker and harder nitrided layers with the specific microstructures on nitrided surfaces. © 2012 The Chinese Society for Metals.
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页码：60 / 66
页数：6
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