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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 30    No. 8    August 2020

[PDF Download]        

    

Tribological behaviors of Ag-graphite composites reinforced with spherical graphite
Yang SUN1, Yan WANG2, Yun LI1, Ke-chao ZHOU1, Lei ZHANG1

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Institute of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China

Abstract:Two kinds of Ag-graphite composites reinforced with spherical graphite (SG) and conventional flake graphite (FG) were prepared by powder metallurgy technology. The effect of graphite morphology on the tribological behavior for the Ag-SG and Ag-FG under the dry sliding wear was investigated with a pin-on-disk tribometer at a load of 3.0 N in atmosphere condition. The results indicated that the minimum wear rate of 3.5×10-5 mm3/(N·m) for Ag-FG was achieved and it reduced by nearly an order of magnitude, reaching 1.6×10-6 mm3/(N·m) for the Ag-SG. The obviously different tribological behaviors between the Ag-SG and Ag-FG were closely related to the formation of cracks in the sub-surface. The stress concentration tended to generate at the edges of flake graphite during sliding process, which resulted in the cracks and severe delamination wear of Ag-FG. However, no cracks were found around the spherical graphite in Ag-SG. The spherical graphite can effectively inhibit the initiation and propagation of cracks, achieving high wear resistance.

 

Key words: Ag-graphite composite; graphite morphology; wear resistance; microstructure; wear mechanism

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com