摘要：为了表征短切碳纤维在大气环境中的爆炸分散效果,提出基于根数的短切碳纤维分散度表征方法,在无风条件下进行短切碳纤维爆炸分散试验,测试短切碳纤维分散单元的尺寸、形貌和分布规律,绘制频率分布和累积分布曲线。结果表明:短切碳纤维爆炸分散以径向纤维间分离为主,同时伴有轴向断裂现象;径向纤维间分离的最小离散单元是单根碳纤维丝,较大的离散单元是由多根碳纤维单丝构成的平面聚集体;50%的短切碳纤维分散为由1~3根碳纤维单丝构成的离散单元,其中27%的短切碳纤维分散为由1~2根碳纤维单丝构成的离散单元和轴向断裂形成的碎段。

关键词：碳纤维；爆炸；分散度；分布曲线

Abstract：In order to characterize the explosion dispersion effect of chopped carbon fibers, a characterizing method was set up based on the number of the carbon fibers and an explosion dispersion experiment was done under conditions with less wind.The dimension, shape and distribution law were measured.Furthermore, the frequency and cumulation curves were drawn.By the analysis, the main procedure of explosion dispersing of carbon fiber is single carbon fibers separated from each other along radial direction while a little of single carbon fibers is broken along axis. The least discrete unit is a single carbon fiber while the bigger one is an aggregate which is composed of several single carbon fibers. By the experimental results, 50% of the sample carbon fibers are dispersed into small discrete unit including 1, 2 or 3 single carbon fibers, 27% of the sample carbon fibers are dispersed into smaller discrete unit including 1 or2 single carbon fibers, which contains a lot of small pieces produced by breaking of single carbon fibers.

Keywords: carbon fiber；explosion；dispersion degree；distribution curve