摘要
采用GCr15钢球与自修复材料在球磨机球磨,采用扫描电子显微镜观测球磨时间对自修复材料在金属表面成膜的过程;研究了不同能量条件下自修复材料对金属表面成膜的影响.试验结果表明:随球磨过程的进行,钢球表面由于碰撞摩擦出现大量划痕,表面粗糙度增加;但随球磨时间的增加,钢球表面逐渐吸附自修复材料,在球磨过程中的碰撞及摩擦能量作用下,自修复材料在钢球表面形成一层均匀的膜层.Φ12.7 mm钢球在球磨过程中速度快,碰撞摩擦产生的能量高,表面成膜均匀致密,而Φ6.0 mm钢球形成的自修复膜层存在一定数量的显微孔洞;同时对自修复材料在球磨过程中的相结构变化及自修复膜层的成分进行了分析.在此基础上,对自修复材料的自修复机理进行了探讨.
Formation of auto-restoration coating using ball-milling machine on the surface of the GCr15 balls was examined by scan electronic microscope. The effect of input energy on formation of the auto-restoration coating was investigated. The experimental results showed that a lot of scratches on the surface of the steel ball were first formed own to collisions and friction among balls, serpentine powder and wall of the milling machine during the course of ball milling, and that auto-restoration material was attached and formed a very thin coating on the surface of the ball under the collisions and wearing. The auto-restoration coating was co- on the surface of the steel ball of φ12.7 mm. While there were a lot of micro-holes in the auto-restoration coating on the surface of the steel ball of φ6.0 mm. In the same time, the phase transformation of auto-restoration material during ball milling and composition of auto-restoration coating were analyzed. The mechanism of the auto-restoration coating of wear of metals on the basis of the experiments could be described as follows： physical attachment of the auto-restoration material on the surface of metal in the first stage, then chemical attachment due to high activation of the auto-restoration material, phase transformation of the auto-restoration material and formation of the auto-restoration coating because of the high pressure and transient high temperature caused by collision and friction between steel balls and wall of the milling machine.
出处
《大连海事大学学报》
CAS
CSCD
北大核心
2005年第3期62-65,共4页
Journal of Dalian Maritime University
基金
国家自然科学基金资助项目(50472025)
关键词
蛇纹石
自修复材料
磨损表面
保护层
成膜机理
serpentine
auto-restoration material
wornsurface
protecting layer
mechanism
