中间相沥青基碳/碳复合材料的组织与性能

以3K PAN基碳纤维为增强体,以中间相沥青为基体前驱体,采用压力浸渍-碳化工艺制备出2D中间相沥青基碳/碳复合材料.研究分析了材料的偏光组织结构、弯曲性能及弯曲断口形貌,结果表明:基体碳的组织结构随碳化压力的不同而变化,低压时以小域组织为主,高压时以广域流线型组织为主;材料的抗弯强度、密度随碳化压力的增加而增高,最高抗弯强度可达278MPa;断裂特征与材料的密度、界面结合状况有关,密度较高、界面结合适中时,弯曲断口以纤维断裂、纤维拔出为主,材料具有韧性断裂特征.

Microstructure and Mechanical Properties of Mesophase Pitch-based C/C Composites

With 3K PAN-based carbon fibers as reinforcing materials and with mesophase pitch as matrix precursor, mesophase pitch-based 2D carbon-carbon composites were obtained by pressure impregnation carbonization technology under different carbonization pressure. The morphology, flexural property and fractured surface were analyzed. The result shows that the morphology of matrix carbon changes with different carbonization pressure. The morphology shows small domains under low carbonization pressure, and domains under carbonization pressure respectively. The flexural strength and density of C/C composites increase with increasing carbonization pressure, and the flexural strength is up to 278MPa. The fractured characters of C/C are related to density and inferface bonding strength. The fractured surfaces are made of fracture and pulling out of fiber when the density is high and the bonding is moderate,materials have toughness character.