以甲苯为前驱体化学液气相沉积法制备碳/碳复合材料

以甲苯为前驱体利用化学液气相沉积法,采用碳布叠层作预制体,于950℃下沉积9h制备了密度为1.63g/cm³的碳/碳复合材料.用金相显微镜、扫描电子显微镜(SEM)和X射线粉末衍射(XRD)等手段对所得的材料进行了组织结构分析,并测定了其力学性能.实验结果表明,以甲苯为前驱体利用该方法可以制备组织结构比较均匀的碳/碳复合材料.用GC/MS气相色谱质谱联用仪对甲苯热分解产物(不挥发成分)进行了成分分析,提出了甲苯裂解制备碳/碳复合材料的初期热裂解机理和热缩聚机理.

Fabrication of Carbon/Carbon Composites by Chemical Liquid-vaporized Deposition with Toluene as Precursors

Carbon-carbon composites with a density of 1.63 g/cm³ were prepared by chemical liquid vaporized deposition with toluene as the precursors and stratum carbon-cloth as the preform at 950 ℃ in 9 hours. Its microstructure, X-ray diffraction and mechanical properties were measured. The results indicate that the homogeneous materials can be prepared by chemical liquid vaporized deposition using toluene as the precursors. The ingredient of the recovered toluene was also analyzed with GC/MS. The possible mechanism of initial pyrolysis and polymeric process of toluene was discussed.