新型炭材料2018，Vol.33Issue(2)：173-182,10.
鳞片石墨掺杂对单向C/C复合材料结构和性能的影响
Effects of a natural flake graphite addition to mesophase pitch on the structure and properties of unidirectional C/C composites
摘要
Abstract
Unidirectional carbon/carbon composites were prepared by hot-pressing mesophase pitch-based carbon fibers as the conductive filler phase and mesophase pitch containing natural flake graphite as the binder/matrix at 500 ℃ followed by carboniza-tion at 1000 ℃ for 1 h and graphitization at 2900 ℃ for 1 h. The morphology and microstructure of cross-sections of the samples were characterized by polarized-light microscopy and scanning electron microscopy. The effect of adding natural flake graphite to the mesophase pitch on the thermal conductivity of the composites was investigated. Results show that the graphite addition has little effect on the bulk densities of the composites,but has a significant impact on the thermal conductivities in different directions. With increasing the graphite content and particle size,the thermal diffusivity of the composites in the longitudinal direction of the fibers decreases while that in the perpendicular direction increases. With a graphite addition of 16 vol% and an average graphite particle size of 60 μm,the longitudinal thermal diffusivity of the composite decreases from 650.5 to 510.9 mm2/s while the perpendicular thermal diffusivity increases from 22.4 to 48.9 mm2/s. The flexural strength of the composites perpendicular to the fibers is also in-creased by 29% by adding graphite.关键词
单向C/C复合材料/天然鳞片石墨/热扩散系数Key words
Unidirectional carbon/carbon composite/Natural flake graphite/Thermal diffusivity分类
通用工业技术引用本文复制引用
李游,袁观明,李轩科,董志军,丛野,张中伟,王俊山..鳞片石墨掺杂对单向C/C复合材料结构和性能的影响[J].新型炭材料,2018,33(2):173-182,10.基金项目
国家自然科学基金(51372177) （51372177）
湖北省教育厅科学研究计划(Q20141104).National Natural Science Foundation of China(51372177) （Q20141104）
Hubei Provincial Department of Education Science Research Project(Q20141104). （Q20141104）
