单根膨胀石墨蠕虫压片的晶粒结构

摘要

用金相显微镜研究了单根膨胀石墨蠕虫压片的表面,发现其具有类似于金属的金相结构.用金属粒度评级软件对所得图像的晶间界进行重构,并分析了其平均粒径.结果表明:蠕虫压片晶粒平均粒径为30 μm～45μm,与原始天然鳞片石墨的粒度及膨胀工艺无关.X射线衍射(XRD)、扫描电镜(SEM)与原子力显微镜(AFM)观察表明:蠕虫压片晶粒存在亚结构,亚结构晶粒内部石墨的结晶完善,单个亚晶粒与原始鳞片石墨外观相同,呈片状,La为3μm ～8μm,Lc为30nm ～80nm.此外,根据XRD数据计算了压片后的膨胀石墨晶粒的取向度和峰背比值,发现晶粒沿垂直于压力的平面取向排列,并且压力越大,晶体的取向越明显.%The surface structure of an individually-compressed expanded graphite worm was obtained by reconfiguration of a series of analysis results from SEM, ARM, XRD and metallography using a granular analyzing software. The mean grain size was 30-45 (xm, independent of the granularity of the starting material and the process of expansion. The particles had a perfect crystallinity with La of 3-8 (Am and Lc of 30-80 nm, and were oriented along the plane perpendicular to the pressing direction. The larger the pressure, the better the orientation.