单根膨胀石墨蠕虫压片的晶粒结构

基金项目: 国家自然科学基金（51072125）

Reconfigured structure of an expanded graphite worm

Material Corrosion and Protection Key Laboratory of Sichuan province, Sichuan University of Science and engineering, Zigong 643000, China

Funds: Sichuan Educational Committee Advance Research Program of Natural Science Foundation, China（035Y029-018-4）.

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30μm～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，L_a为3μm～8μm，L_c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。
- 膨胀石墨 /
- 晶粒结构 /
- 取向度
Abstract: The surface structure of an individually-compressed expanded graphite worm was obtained by reconfiguration of a series of analysis results from SEM, AFM, XRD and metallography using a granular analyzing software. The mean grain size was 30-45μm, independent of the granularity of the starting material and the process of expansion. The particles had a perfect crystallinity with L_a of 3-8μm and L_c of 30-80nm, and were oriented along the plane perpendicular to the pressing direction. The larger the pressure, the better the orientation.
- Expanded graphite /
- Reconfigured structure /
- Orientation degree