中文摘要：

利用模压半炭化成型工艺在大气环境下制备出了短切炭纤维增强沥青基C／C复合材料（简称SCFRC）。研究了短切炭纤维的体积分数对SCFRC材料的体积密度和力学性能的影响规律。借助光学显微镜和扫描电镜对其微观组织和断口形貌进行了观察，分析了短切炭纤维对SCFRC材料的增强机制。结果表明，当短切炭纤维的体积分数由0％增大到11．8％时，SCFRC材料的力学性能随之呈线性增加；短切炭纤维增强SCFRC材料的机制主要有裂纹偏转效应、桥联效应以及脱粘和拔出效应。

英文摘要：

Short carbon fiber reinforced pitch-based carbon/carbon composites （SCFRC） with high density and low cost were fabricated by mold pressing followed by semi-carbonization. The effect of the volume fraction of short carbon fibers on density and mechanical properties of the SCFRC was studied. Their microstructures and fracture morphologies were observed using an optical microscope and SEM, and the reinforcing mechanism of the short carbon fibers was elucidated. Results show that mechanical properties increase linearly with an increase of short carbon fiber volume fraction from 0 % to 11.8 %, and the strengthening mechanisms involved are based mainly on crack deflection, fiber bridging, fiber debonding and pull-out.