论文部分内容阅读
以天然气为炭源气体,采用等温化学气相沉积工艺对孔隙率为89.5%的短切炭纤维毡进行致密化。经过150h的沉积,所制备的炭/炭(C/C)复合材料的密度达到1.89g/cm3。利用PLM、XRD、SEM以及三点弯曲测试对所制备的C/C复合材料的纤维结构和力学性能进行研究。结果表明:沉积的热解炭基体为高织构热解炭;经过高温石墨化处理后,大幅度地提高了材料的晶粒尺寸与石墨化度,降低了材料的强度和模量,并提高了其韧性。这些力学性能的变化与石墨化处理后材料内部显微结构的变化相关。
Using natural gas as carbon source gas, the chopped carbon fiber mat with the porosity of 89.5% was densified by the isothermal chemical vapor deposition process. After 150h deposition, the prepared C / C composites had a density of 1.89g / cm3. The fiber structure and mechanical properties of the prepared C / C composites were investigated by PLM, XRD, SEM and three-point bending test. The results show that the deposited pyrolytic carbon matrix is highly textured pyrolytic carbon. After high temperature graphitization, the grain size and graphitization degree of the material are greatly increased, the strength and modulus of the material are reduced, Its toughness. These changes in mechanical properties are related to changes in the microstructure of the graphitized material.