Influence of graphite content on sliding wear characteristics ofCNTs-Ag-G electrical contact materials

来源期刊：中国有色金属学报(英文版)2009年第1期

论文作者：王娟 凤仪 李庶 林森

文章页码：113 - 118

Key words：CNTs-Ag-G electrical contact material; graphite; contact resistance; friction coefficient; wear mass loss

Abstract: CNTs-Ag-G electrical contact composite material was prepared by means of powder metallurgical method. The influence of the graphite content on sliding wear characteristics of electrical contact levels was examined. In experiments, CNTs content was retained as 1% (mass fraction), and graphite was added at content levels of 8%, 10%, 13%, 15% and 18%, respectively. The results indicate that with the increase of graphite content, the contact resistance of electrical contacts is enhanced to a certain level then remains constant. Friction coefficient decreases gradually with the increase of graphite content. Wear mass loss decreases to the minimum value then increases. With the small content of graphite, the adhesive wear is hindered, which leads to the decrease of wear mass loss, while excessive graphite brings much more worn debris, resulting in the increase of mass loss. It is concluded that wear mass loss reaches the minimum value when the graphite mass fraction is about 13%. Compared with conventional Ag-G contact material, the wear mass loss of CNTs-Ag-G composite is much less due to the obvious increase of hardness and electrical conductivity, decline of friction surface temperature and inhibition of adhesive wear between composites and slip rings.

基金信息：the National Natural Science Foundation of China
Key Science Foundation of the Education Department of Anhui Province, China
the Innovation Center for Postgraduates at HFNL (USTC)
the Open Project Program of Ministry of Education of China