新型炭材料2011，Vol.26Issue(5)：328-334,7.
石墨化处理对双层热解炭基2DC/C复合材料微观结构的影响
Effect of high temperature treatment on the microstructure and mechanical properties of binary layer textured 2D C/C composites
摘要
Abstract
X-ray diffraction (XRD), scaning electron micrsocopy and transmission electron microscopy were used to study the changes of the pyrolytic carbon microstructure and fiber-matrix interface of binary layer textured 2D C/C composites before and after heat treatment. The XRD results show that the d002 decreased and the graphi-tization degree increased significantly with the increase of heat treatment temperature. No obvious change of the fracture surface morphology and lattice fringes of the inner layer, which correspond to low textured pyrolytic carbon, was observed. However, the lattice fringes of the outer layer (high textured pyrolytic carbon) are regularly parallel, and the density of microcracks in the outer layer increases obviously after heat treatment. These microc-racks make cracks propagate and deviate easily, leading to an increase of the toughness of the C/C composites. Moreover, the weakening of the fiber-matrix interface bonding is another mechanism for the toughness enhancement. The results of three point bending tests confirmed the proposed mechanism.关键词
C/C复合材料/石墨化处理/微观结构/界面Key words
Carbon/carbon composites/ High temperature heat treatment/ Microstructure/ Interface分类
通用工业技术引用本文复制引用
李伟,李贺军,张守阳,魏建锋,王杰,李照谦..石墨化处理对双层热解炭基2DC/C复合材料微观结构的影响[J].新型炭材料,2011,26(5):328-334,7.基金项目
国家自然科学基金重点项目(50832004)和面上项目(50972121),"111"计划(B08040). （50832004）
