【摘要】 通过热梯度化学气相渗透工艺制备了石墨粉增强热解炭基复合材料(G/C Composites),采用偏光显微镜、SEM观察了其微观组织结构,运用电学和机械实验对其性能进行了研究。结果表明,热解炭能从不同的方位与石墨颗粒包裹性地结合,充分地填充石墨颗粒间的孔隙。G/C复合材料呈现各向同性,密度高(1.85g/cm3),体积电阻率高(148.4μΩ.m),具有优异的力学性能(抗弯强度为50MPa,耐压强度为120MPa)。G/C复合材料的力学性能比纯石墨高一倍,抗压强度与炭毡增强C/C复合材料相当,弯曲强度比炭毡增强C/C复合材料略低。更多还原

【Abstract】 Graphite powder reinforced pyrocarbon (G/C) was prepared by thermal gradient chemical vapor infiltration technology. The microstructures and basic properties of the G/C were investigated by polarized light microscopy, SEM, electrical and mechanical tests. It is found that pyrocarbon enwraps the graphite powder particles and fills the pores between them effectively. The G/C is isotropic, has a density of 1.85g/cm3, and has a higher volume resistivity (148.4μΩ·m) than graphite and the other C/C composites. It has excellent mechanical properties with a flexural strength of 50MPa and a compressive strength of 120MPa, twice those of pure graphite. The compressive strength of the G/C is similar to, and the flexural strength is lower than, those of carbon felt/pyrocarbon composites.更多还原