Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 27    No. 10    October 2017

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Effects of environment on dry sliding wear behavior of silver-copper based composites containing tungsten disulfide
Ji-si WU1, Jing-fu LI1, Lei ZHANG1, Zhi-yuan QIAN2

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Shanghai Key Laboratory of Spacecraft Mechanism, Shanghai 201109, China

Abstract:Silver based composites containing different amounts of WS2 were prepared by hot-pressing method and their tribological behaviors were investigated against coin silver under humid air, dry nitrogen and vacuum on a ball-on-disk tester with normal load of 5 N. The components of composites, microstructure of debris and worn surface were characterized using XRD SEM, EDS and XPS. It is demonstrated that environmental conditions significantly affect the tribological behavior of silver based composites. The friction coefficient is the highest in humid air, and the lowest in dry nitrogen. It is found that the friction and wear behavior of the composites are strongly depended on the characteristics of the lubrication film forming in different operating environments, such as thickness and composition. In addition, it is indicated that the dominant wear mechanisms of silver based composites are abrasive wear and delamination under different conditions.

 

Key words: self-lubricating composites; tribological behaviors; atmosphere; wear mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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