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https://hdl.handle.net/2440/78956
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Type: | Journal article |
Title: | Novel high damage-tolerant, wear resistant MoSi2-based nanocomposite coatings |
Author: | Xu, J. Li, Z. Xie, Z. Munroe, P. Lu, X. Lan, X. |
Citation: | Applied Surface Science, 2013; 270:418-427 |
Publisher: | Elsevier Science BV |
Issue Date: | 2013 |
ISSN: | 0169-4332 |
Statement of Responsibility: | Jiang Xua, Zhengyang Li, Zong-Han Xie, Paul Munroe, Xiao Lin Lu, Xiu Feng Lan |
Abstract: | In this study, novel MoSi 2 -based nanocomposite coatings were deposited on Ti-6Al-4V substrates by a two-step process involving firstly, deposition of MoSi 2 -based coatings, using a double cathode glow discharge process and, secondly, plasma nitridation of the as-deposited coatings. The aim of this latter step is to introduce nitrogen into the coating and promote the formation of amorphous silicon nitride. The resulting coatings were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). It was found that the nanocomposite coatings were composed of nanocrystallite Mo 5 Si 3 and MoSi 2 grains embedded in an amorphous Si 3 N 4 matrix. The mechanical properties and damage resistance of the coatings were evaluated by both Vickers indentation and nanoindentation techniques. Dry sliding wear tests were performed using a ball-on-disc type tribometer, in which the coated samples were tested against a ZrO 2 ceramic ball at normal loads of 2.8 and 4.3 N under ambient conditions. Compared with the monolithic MoSi 2 nanocrystalline coating, the specific wear rates of the nanocomposite coatings decreased by an order of magnitude. The specific wear rate was further improved by about 20% through the addition of Al, which was attributed to an optimum combination of mechanical properties. © 2013 Elsevier B.V. |
Keywords: | Nanocomposites Mechanical properties Wear Coatings |
Rights: | Copyright © 2013 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.apsusc.2013.01.041 |
Published version: | http://dx.doi.org/10.1016/j.apsusc.2013.01.041 |
Appears in Collections: | Aurora harvest Mechanical Engineering publications |
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