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Role of Cr additions in enhancing wear and oxidation resistance of (Mo1-xCrx)Si-2 nanocrystalline films
Xu J; Li ZY(李正阳); Munroe P; Xie ZH; Xu, J (reprint author), Nanjing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, 29 Yudao St, Nanjing 210016, Jiangsu, Peoples R China.
Source PublicationCERAMICS INTERNATIONAL
2014-12
Volume40Issue:10Pages:15859-15874
ISSN0272-8842
AbstractIn order to explore the effects of Cr alloying on the wear and oxidation resistance of MoSi2 films, four kinds of (Mo1-xCrx)Si-2 (x=0, 0.05, 0.10 and 0.15) nanocrystalline films of differing Cr contents were fabricated onto Ti6Al4V substrates by a double cathode glow discharge apparatus. The microstructure features of the as-deposited films were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The hardness and elastic modulus of the (Mo1-xCrx)Si-2 nanocrystalline films were evaluated by nano-indentation. The dry sliding wear properties of the as-deposited films sliding against GCr15 rolling bearing steel were studied using a ball-on-disc type tribometer at room temperature. The results showed that the friction coefficients and specific wear rates of the (Mo1-xCrx)Si-2 nanocrystalline films decreased with increasing Cr content in the films. The oxidation behavior of the (Mo1-xCrx)Si-2 nanocrystalline films was investigated at 500 degrees C under cyclic oxidation conditions in air for exposure time of 100 h. The oxidation kinetics of the films was found to obey a subparabolic behavior, and three Cr-containing MoSi2 films showed a much lower weight gain and the oxidation rate constant as compared to the monolithic MoSi2 film during a 100 h exposure. Surface morphologies, phase constituents and electrochemical behavior of the oxide scales formed on the (Mo1-xCrx)Si-2 nanocrystalline films were characterized using FESEM, XRD and electrochemical-impedance spectroscopy (EIS). The electrochemical results revealed that the structure of the oxide scales changed from a homogeneous and dense structure to a duplex structure consisting of a porous outer layer and a denser inner layer. The overall resistance of the oxide scales depended strongly on both the oxidation time and Cr content in the films. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
KeywordMolybdenum Silicides Oxidation Behavior Friction And Wear Electrochemical Impedance Spectroscopy
Subject AreaMaterials Science
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000343353600058
Funding OrganizationThe authors acknowledge the financial support of the National Natural Science Foundation of China under Grant nos. 51175245 and 51374130 and the Aeronautics Science Foundation of China under Grant no. 2013ZE52058.
DepartmentMAMYAG激光毛化技术
Classification一类
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49354
Collection先进制造工艺力学重点实验室
Corresponding AuthorXu, J (reprint author), Nanjing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, 29 Yudao St, Nanjing 210016, Jiangsu, Peoples R China.
Recommended Citation
GB/T 7714
Xu J,Li ZY,Munroe P,et al. Role of Cr additions in enhancing wear and oxidation resistance of (Mo1-xCrx)Si-2 nanocrystalline films[J]. CERAMICS INTERNATIONAL,2014,40(10):15859-15874.
APA Xu J,Li ZY,Munroe P,Xie ZH,&Xu, J .(2014).Role of Cr additions in enhancing wear and oxidation resistance of (Mo1-xCrx)Si-2 nanocrystalline films.CERAMICS INTERNATIONAL,40(10),15859-15874.
MLA Xu J,et al."Role of Cr additions in enhancing wear and oxidation resistance of (Mo1-xCrx)Si-2 nanocrystalline films".CERAMICS INTERNATIONAL 40.10(2014):15859-15874.
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