二硅化钼机械球磨过程的研究

Investigation of mechanical ball milling process of MoSi_2

通过X射线衍射仪、电子显微镜和ZJM10T型搅拌机研究了MoSi2粉末球磨过程.结果表明:机械球磨过程中,MoSi2粉末的衍射峰强度随球磨时间的增加不断减弱且逐渐宽化;其机械化学变化随球磨时间的延长表现为:晶粒尺寸减小,显微应变增加,有效温度系数增加.机械化学效应因子之间的变化关系如下:晶粒尺寸与有效温度系数和显微应变呈逆变关系;显微应变随有效温度系数增加而增大.

The ball milling process of MoSi2 powder in the mixer of ZJM10T type is investigated by means of XRD and SEM. The investigation result shows that, with the increasing of milling time in such process, the intensity of diffraction peak of MoSi2 power decrease continuously while the width of that increases gradually; its mechano-chemistry varies in such manner that the size of crystalline grains diminishes, microswpic strain increases, and the coefficient of effective temperature imcreases, also. The variation relationship between the mechano-chemical effect factors are as follows: the crystalline grain size varies inversely with the microscopic strain and the effective temperature coefficient, and the microscopic strain increases with the effective temperature coefficient.