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以T300炭纤维无纬布、网胎为原材料,层叠针刺成型炭纤维预制体,并采用化学气相沉积工艺对预制体进行致密,制成密度为1.55 g/cm3的针刺C/C复合材料。对针刺C/C复合材料的微观结构进行了观察分析,并对材料力学性能进行了测试。结果表明:化学气相沉积致密的针刺C/C复合材料呈现出以层间大量垂直纤维束为节点的类钉板状网状结构,这种特殊结构使材料层间结合更好,材料整个结构更加紧密;针刺C/C复合材料内部纤维被沉积形成的热解炭所包裹,热解炭的织构类型为光滑层(SL)和粗糙层(RL)并存;针刺C/C复合材料的各项力学性能均达到了较高水平,并且高温力学性能比常温力学性能有了很大幅度的提高。
Using T300 carbon fiber non-woven fabric and mesh tire as raw materials, acupuncture-forming carbon fiber preform was laminated and the preform was densified by chemical vapor deposition process to make acupuncture C / C composite material with density of 1.55 g / cm3 . The microstructure of acupuncture C / C composites was observed and analyzed, and the mechanical properties of materials were tested. The results show that the compact acupuncture C / C composites with chemical vapor deposition presents a mesh-like structure with a large number of vertical fiber bundles as the nodal point. This special structure makes the bonding of the material layers better and the whole structure of the material (C / C) composites. The texture type of pyrolytic carbon was smooth layer (SL) and rough layer (RL) The various mechanical properties have reached a high level, and high temperature mechanical properties than the room temperature mechanical properties have been greatly improved.