短切炭纤维增强沥青基C/C复合材料的组织特征

利用新型、高效的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复合材料制品，并借助光学显做镜和扫描电镜对其微观组织和断口形貌进行了观察。通过分析，解释了短切炭纤维增强沥青基C／C复合材料中炭纤维损伤的形成机制，提出了作为增强体相的短切炭纤维和焦炭颗粒与基体炭之间独特的界而结构模型。研究还表明：复合材料中明显存在着基体相和颗粒相一基体相的显微结构不仅呈层片状，而且层片状的结构好像数层桔子皮，将颗粒相包裹起来，这种“桔皮包裹”式的结构与炭纤维表面的POG结构基本相似。

Microstructural characteristics of short carbon fiber reinforced pitch-based carbon/carbon composites

Short carbon fiber reinforced pitch-based carbon/carbon composites (SCFRC) with high density and low cost were fabricated under atmospheric conditions by a new and efficient mould pressing and semi-carbonization shaping technology. Microstructures and fracture morphologies of the SCFRC materials were observed using optical microscopy and SEM. The damage formation mechanism of short carbon fibers in mould pressing SCFRC materials was investigated, and an interface structural model between reinforcements (such as short carbon fiber and granular cokes) and carbon matrix in SCFRC materials was also proposed. Moreover, the findings indicate that both a matrix phase and a particle phase exist in SCFRC materials, and the particle phase is enwrapped by the matrix phase which has alayered structure like multiple orange peels. The orange-peel structure is similar to the parallel-oriented graphite structure on the surface of some carbon fibers.