Role of temperature on tribological behaviour of Ti containing MoS2 coating against aluminum alloys

被引：26
作者：
Banerji, A. [1 ]
Bhowmick, S. [1 ]
Alpas, A. T. [1 ]
机构：
[1] Univ Windsor, Mech Automot & Mat Engn Dept, Windsor, ON N9B3P4, Canada
来源：
SURFACE & COATINGS TECHNOLOGY | 2017年 / 314卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
MoS2; coatings; Diamond-like carbon; Adhesion; Friction; Aluminum alloys; DIAMOND-LIKE CARBON; MOS2/TITANIUM COMPOSITE COATINGS; LOW-FRICTION; TOOL COATINGS; PERFORMANCE; LUBRICATION; FILMS; DLC; HUMIDITY; SURFACE;
D O I：
10.1016/j.surfcoat.2016.09.044
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Friction and adhesion mechanisms of a Ti incorporated multilayer MoS2 (Ti-MoS2) coating, intended for use in elevated temperature engineering applications like warm forming or machining of lightweight Al alloys, were investigated. Pin-on-disk type tests were performed at temperatures between 25 C and 500 C to measure variations of the coefficient of friction (COF) values and wear rates of Ti-MoS2 sliding against Al-6.5% Si (319 Al) counterfaces. The steady state COF, mu s, of Ti-MoS2 decreased from 0.11 at 25 degrees C to 0.05 at 200 degrees C. A ps of 0.13 was recorded at 350 degrees C. Then an increase in COF to 0.34 at 500 degrees C was observed. Progression of surface compositional changes during sliding at different temperatures was monitored using micro-Raman and X-ray photoelectron (XPS) spectroscopy. It was found that formation of a MoS2 rich transfer layer was responsible for maintaining low COF values up to 200 degrees C at which point MoO3 formation started. At T> 350 degrees C, MoO3 covered most of the contact surfaces resulting in an increase in the COF and volumetric wear losses accompanied by Al transfer to the coating surfaces. Accordingly, it can be suggested that the safe operation window for use of Ti-MoS2 coating against Al-Si alloys ranges between 25 degrees C and 350 degrees C. (C) 2016 Elsevier B.V. All rights reserved.
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页码：2 / 12
页数：11
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