表面处理对碳纤维束拉伸性能与强度分布的影响

Influence of Surface Treatment on Tensile Properties and Strength Distribution of Carbon Fiber Bundles

为了探究表面处理工艺对C纤维束拉伸性能的影响,采用化学气相沉积(CVD)制备热解炭(PyC)层和热处理以及两者相结合的方法对C纤维束进行处理,并测试了处理前后C纤维束的拉伸性能和强度分布。实验结果表明:在C纤维表面沉积PyC层降低了纤维束的拉伸性能与强度稳定性。对C纤维束进行热处理改善了纤维束的拉伸性能和强度稳定性,并在1 800℃均达到了最大值。随着热处理温度的升高,C纤维束的拉伸断裂方式逐渐由韧性断裂向脆性断裂转变。采用沉积PyC层以及沉积PyC层和热处理相结合的方式处理的C纤维束均以脆性方式断裂。

In order to explore the influence of surface treatment process on the tensile properties of carbon fiber bundles, pyrocarbon(PyC) layer fabricated by chemical vapor deposition(CVD), high temperature heat treatment and the combination treatment processes of the former two were applied to treat carbon fiber bundles. The tensile properties and strength distribution of carbon fiber bundles before and after treatment were tested. The experimental results showed that the deposition of PyC layer on the surfaces of carbon fibers reduced the tensile properties and strength stability. The tensile properties and strength stability of carbon fiber bundles were improved by high temperature heat treatment, which reached the maximum values at 1 800 ℃. With the increase of heat treatment temperature, the tensile fracture mode of carbon fiber bundles gradually changed from ductile fracture to brittle fracture. The carbon fiber bundles treated by the deposition of PyC layer or the combination of deposition of PyC layer and heat treatment were all fractured in a brittle mode.