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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 3    June 2002

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Formation of surface coating on milling balls 
during milling of Cr powders
WANG Cheng-guo(王成国), QI Bao-sen(齐宝森),WANG Rui-hua(王瑞华)

School of Materials Science and Engineering,
Shandong University, Ji′nan 250061, China

Abstract:The formation regularity of surface coating on milling balls during milling of C r powders was investigated, revealing that the plastic deformation of the balls surface plays an important role in the formation of coating and that the stronger affinity between the powders and the balls is a necessary pre-condition for the coating. The size of Cr powders, the coating thickness and the microhardness vary consistently with milling time during milling. At initial milling stage, t he powder size decreases, while the coating thickness and the microhardness increase, however, after milling for 24h, they all change slightly with prolonged milling, indicating a dynamic equilibrium between the powders cold welding and crashing, i.e. an almost equal rate for the powders attaching to and breaking off the milling balls.

 

Key words: coating;milling balls;plastic deformation;microhardness

ISSN 1672-7029
CN 43-1423/U

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