碳纤维增强树脂基复合材料的性能研究

在酚醛树脂中分别加入（质量分数，下同）5%，10％，15％，20％，25％和30％的短切碳纤维，经过模压成型后，对其磨损性能、硬度、导电性能进行了测定。结果表明，随着碳纤维含量的增加，材料的耐磨性提高，但其提高幅度随着碳纤维含量的增加而减小，最后降低为零；材料的硬度随着碳纤维含量的增加开始增幅较小，当碳纤维含量〉10％时呈线性增加；材料的导电性能随着碳纤维含量增加而提高，电阻值下降与碳纤维的增加呈非线形关系，有一个约为15％的渗滤阀值；碳纤维含量〈15％时，电阻率很大，碳纤维含量15％时，电阻值突然变小，说明碳纤维含量〉15％时，复合材料具有一定的导电性能。

STUDY OF PROPERTIES OF CARBON FIBER REINFORCED RESIN MATRIX COMPOSITES

Through adding 5%, 10%, 15%, 20%, 25%, 30% of the carbon fiber content to phenol formaldehyde resin and compacting the mixture to a desired shape, the samples were prepared in this paper. The wearability, hardness, electric conductivity and compression strength have been studied. The results show that with the increment of carbon content, the wearability of composites is improved. But the improving degree decreases with the increment of carbon fiber content and tends to be stable finally. The hardness increases little and increases linearly as the fiber content exceeds 10%. The electric conductivity of composites increases greatly as the fiber content exceeds 10%. The tendency of resistance decreasing is not linear with the increment of fiber weight fraction and there is a threshold at about 15%. When the fiber content is lower than 15%, the resistance of composites is very high; When it is higher than 15%, the resistance decreases a lot. This indicates that when the carbon fiber content exceeds 15 %, the composite has some certain electric conductivity.