热解碳微观结构调控与纳米压痕测试

目的研究前驱体种类对热解碳结构的影响及热解碳的性能。方法以甲烷为主要前驱体,添加5%丙烯,在碳布缝合预制体上进行沉积实验,对所得具有不同结构热解碳的样品进行纳米压痕测试。结果添加丙烯降低了实验温度,所得沉积效率仍高于纯甲烷,所得热解碳结构在不同时期有所差异。纤维束内部的热解碳结构对材料的整体性能影响较大,当纤维表面为ISO结构热解碳时,纤维束内硬度和模量偏高,分别为3.96 GPa和32.0 GPa,断裂模式为脆性断裂;当纤维表面为RL结构热解碳时,纤维束内的强度和模量偏低,分别为1.93 GPa和19.7 GPa,断裂模式为假塑性断裂。结论前驱体的种类对热解碳的结构影响较大,所得材料性能具有较大差异。

Micro-structure Control of Pyrocarbon and Nano Indentation Test

Objective To study the influence of precursor for the pyrocarbon texture and the property of pyrocarbon.Method Methane was used as the main precursor, and deposition experiment was conducted on carbon cloth stitched preform after add-ing 5% propylene. After that, nano indentation experiment was performed for the deposited pyrocarbon samples with different textures.Results It was found that higher deposition efficiency was got at lower experiment temperature when propylene was added as compared to pure methane, and different pyrocarbon texture was obtained at different stages. The hardness and mod-ulus of different samples were measured by the nano indentation method. It was found that the texture of pyrocarbon in the bun-dle had obvious influence on the materials’ properties. When the pyrocarbon texture in fiber bundle was ISO, the strength and modulus in the bundle were relatively higher, with values of 3.96 GPa and 32.0 GPa, respectively, and the fraction mode was brittle fracture. When the pyrocarbon texture in fiber bundle was RL, the strength and modulus in the bundle were relatively lower, with values of 1.93 GPa and 19.7 GPa, respectively, and the fracture mode was pseudoplastic fracture.Conclusion The types of precursor had great influence on the structure of pyrolytic carbon, and the material properties had obvious difference.