Mo/2Si混合粉末的摩擦化学效应  

Tribochemical Effects of Mo/2Si Powder Mixture in Ball Milling

作　　者：马勤[1] 王翠霞[1] 薛群基[2] 何荔[2] 朱雪斌[1] 

机构地区：[1]甘肃工业大学材料科学与工程学院,甘肃兰州730050 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2002年第2期126-129,共4页Tribology

基　　金：教育部高等学校骨干教师资助计划项目 (2 0 0 1)

摘　　要：利用 ZJM10 T型搅拌机和 X射线衍射仪研究了 Mo/ 2 Si混合粉末在机械球磨过程中的摩擦化学效应 .结果表明 :在球磨初期 ,晶粒尺寸明显减小 ,显微应变和有效温度系数明显增加 ;在球磨 3h后 ,Mo和 Si粉末的晶粒尺寸和显微应变变化幅度减小 ;球磨 10 h后 ,有效温度系数趋于极限值 ,晶粒尺寸和显微应变几乎保持不变 .塑性 Mo颗粒的机械活化以变形或晶格畸变加剧为主 ,而脆性 Si颗粒的机械活化以细化或比表面积增加为主 .The tribochemical effects of Mo/2Si powder mixture in ball milling have been studied by X ray diffraction. It has been found that the mechanical milling process of the powder mixture was characterized by a decrease in the crystallite size and increase in the microstrain and effect temperature factor. The variation of the crystallite size,the microstrain, and the effective temperature factor took different pace at different milling duration. Namely, the crystallite size decreases largely in the early stage of milling, then it comes to stable stage in a range of milling duration and decreases gradually again at an extended milling duration. Finally the crystallite size keeps constant at a long enough milling duration. Contrary to the above, the microstrain increases considerably in the early stage of milling and comes to a nearly constant value at an extended milling duration, and the effective temperature factor comes to a limit value. Moreover, the changing speed of the different tribochemical effect factors is also different, so is that for the different phases comprising the particulate mixture. Namely, the brittle silicon particulates were easier to fracture than the ductile molybdenum particulates. Therefore, Si shows smaller microstrain and limit value of effect temperature factor than molybdenum. However, almost no tribochemical change was detected in the milling process of Mo/2Si powder mixture.

关 键 词：Mo/2Si混合粉末 球磨 摩擦化学效应 

分 类 号：TH117[机械工程—机械设计及理论] TF123.11[冶金工程—粉末冶金]