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所属单位：材料科学与技术学院

发表刊物：JOURNAL OF ALLOYS AND COMPOUNDS

关键字：Tantalum silicides Friction and wear Electrochemical impedance Corrosion

摘要：A novel wear and corrosion resistant beta-Ta5Si3 coating was deposited onto a Ti-6Al-4V substrate using a double glow discharge plasma method. The structure of the coating was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM), and its mechanical properties were determined by a combination of nanoindentation and scratch testing. Dry sliding wear behavior of the beta-Ta5Si3 coating was evaluated using a ball-on-disc tribometer. Further, the electrochemical behavior of the beta-Ta5Si3 coating was assessed through immersion in a 3.5 wt% NaCl solution. The as-deposited coating consisted of equiaxed tetragonal D8(m)-structured Ta5Si3 exhibiting a similar to 4 nm grain size with a pronounced (400) preferred orientation. The specific wear rates of the beta-Ta5Si3 coating were similar to 10(-6) mm(3)/(N m), which is two orders of magnitude better than that of the uncoated substrate under the same test conditions. This is because the coating exhibits higher values of HIE. Finally, the corrosion resistance of the coating was improved relative to bare alloy in this solution. Mott-Schottky analysis showed that the passive film formed on the coating during corrosion testing behaved like an n-type semiconductor. The carrier density was one order of magnitude less than that formed on bare substrate in the same solution. In light of this, the beta-Ta5Si3-nanocrystalline coating is expected to provide protection to metallic components against wear and corrosion and as such extend their service life. (C) 2017 Elsevier B.V. All rights reserved.

ISSN号：0925-8388

是否译文：否

发表时间：2017-03-30

合写作者：陈建,Jiang, Shuyun,Munroe, Paul,Xie, Zong-Han

通讯作者：徐江