摘要
为了研究镜质组富集物的变质程度对泡沫炭孔结构和抗压强度的影响,以气煤、肥煤和焦煤的镜质组富集物为前驱体,采用高压渗氮法制备煤基泡沫炭。利用扫描电子显微镜观察断面形貌,用偏光显微镜统计孔胞直径分布和孔壁厚度分布,采用长春万能材料试验机检测泡沫炭的抗压强度。结果表明:随着镜质组富集物变质程度的提高,泡沫炭的抗压强度增大;气孔率高、孔壁薄、孔壁真密度低,则泡沫炭的抗压强度低。镜质组富集物的胶质层指数和奥亚膨胀度越大,形成泡沫炭孔胞越大,且分布不均匀。镜质组富集物的黏结指数越低及干燥无灰基挥发分越高的镜质组形成的泡沫炭孔壁真密度越低,反之亦然。
In order to study the impact of metamorphism of vitrinite enrichment on pore structure and compressive strength, carbon foams were prepared by nitrizing under high pressure with vitrinite enrichment from gas coal, fat coal and coking coal as precursors. The morphologies of fracture surface of carbon foams were observed by scanning electron microscope, the pore size distribution and wall thickness of carbon foams were counted by polarized light microscope, and the compressive strengths of carbon foams were tested by universal material testing machine from Changchun. Results show that the compressive strength of carbon foams increased with the increase of the degree of metamorphism of vitrinite enrichment. The compressive strength of carbon foam with the higher porosity, thinner pore wall and lower true density was lower, and vice versa. The pores of the carbon foam with the higher plastic index and Aoya dilatation of the vitrinite enrichment was bigger and heterogeneous. The lower the true densities of carbon foams pore wall was, the higher valitile based on dry and free ash and lower caking index of the vitrinite enrichment were, and vice versa.
出处
《炭素技术》
北大核心
2017年第3期29-33,共5页
Carbon Techniques
基金
辽宁省自然科学基金(20170540470)
辽宁科技大学专项基金(601009816-30)
辽宁科技大学重大科研平台开放课题(USTLKFZD 201638)
大学生创新基金(DC2016117)
关键词
泡沫炭
体积密度
交互作用
响应面
Carbon foam
bulk density
interaction
response surface
