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为了研究在两种不同的介质中球磨能量对碳纳米管(CNTs)分散的影响,在3种不同球磨能条件下,采用湿磨和干磨法制备了Cu-Cr/CNT混合纳米复合材料。利用X射线衍射技术评估了复合材料的结构演变和固溶变形,利用扫描电子显微镜和透射电子显微镜表征了复合材料的显微组织,并采用显微硬度试验测试了其力学性能。其平均晶粒尺寸范围为20~63 nm,与球磨介质和球磨能有关。CNTs的分散与球磨能呈函数关系。FESEM像和显微硬度测试结果表明,与干磨法相比,湿磨法更有利于CNTs的分散。在高球磨能下湿磨法对制备均质混合纳米复合材料更有利,对CNTs的损坏最小,而损坏小且分散较好的CNTs有利于获得较高的显微硬度。与晶粒尺寸变化相比,CNTs的分散和损坏对硬度的影响更大。
In order to investigate the effect of ball milling energy on the dispersion of CNTs in two different media, Cu-Cr / CNT hybrid nanocomposites were prepared by wet milling and dry milling under three different ball milling conditions. The structure evolution and solution deformation of the composites were evaluated by X-ray diffraction. The microstructure of the composites was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mechanical properties of the composites were tested by microhardness test. The average grain size range of 20 ~ 63 nm, and milling media and ball milling can be related. CNTs dispersion and ball milling can be a functional relationship. FESEM image and microhardness test results show that, compared with the dry milling method, wet grinding method is more conducive to the dispersion of CNTs. Wet milling at high ball milling is more advantageous for the preparation of homogeneous hybrid nanocomposites, with less damage to CNTs, while less damaged and better dispersed CNTs are advantageous for obtaining higher microhardness. The dispersion and damage of CNTs have greater influence on the hardness than the change of the grain size.