Formation of surface coating on milling balls during milling of Cr powders

来源期刊：中国有色金属学报(英文版)2002年第3期

论文作者：王成国 齐宝森 王瑞华

文章页码：458 - 461

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

Abstract: The formation regularity of surface coating on milling balls during milling of Cr 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.