碳纤维经不同温度处理后的力学性能分析

Study on the mechanical properties of carbon fiber treated with different temperatures

对三家不同企业生产的同规格6K碳纤维复丝分别进行200、500和800℃的高温处理,对处理前后碳纤维单丝、复丝的力学性能进行测试。结果表明:随着温度的升高,复丝表面浆料降解,复丝呈松散状态,甚至出现800℃时复丝纤维断裂现象;对碳纤维单丝来说,在200℃时美国碳纤维的强度损失最大,在500℃时东邦碳纤维的强度损失最大,在800℃时东丽碳纤维的强度损失最大,而单丝的断裂伸长率均是先降低后增加,说明不同厂家生产的同一规格碳纤维,由于原料、工艺、技术水平等的差异对碳纤维的耐高温性有显著影响;对碳纤维复丝来说,在200和500℃时,东丽碳纤维复丝的强度损失最大,而800℃时三种碳纤维复丝均出现断裂,未测试复丝力学性能。

After 6K carbon fibers from three different enterprises were treated at 200, 500 and 800℃respectively, the tensile properties of monofilament and multifilament of carbon fibers were respectively tested.The test results show that with the increase of temperature, the slurry of filament surface is resolved and multifilament become loose, and even breakage appears under the 800 ℃;for the single carbon fiber, the largest loss of strength is American carbon fiber at 200 ℃, Toho carbon fiber at 500 ℃, and Dongli carbon fiber at 800℃, while the elongation at break of single fiber decreases firstly and then increases, which means that the differences in material, process and technology level for the same specification carbon have the significant effect on the high temperature resistance.For the multifilament, at both 200 and 500 ℃, the loss of strength of Dongli carbon fiber is biggest, while at 800℃, not tested because of the broken for three carbon fibers.