采用“四探针法”测定6种沥青基碳纤维单丝的轴向电阻率,通过3个经验公式计算得到其热导率,再将计算值与厂商公布值进行对比分析.结果表明:对于热导率＞600或＜300 W/(m· K)的碳纤维采用公式λ=1261/ρ计算得到的热导率值与厂商公布值最为吻合,而对于热导率在300 ～ 600 W/(m· K)的碳纤维采用公式λ=440 000/(100ρ+258)-295计算得到的热导率值与厂商公布值最为吻合.以此测试值为基础,建立了沥青基碳纤维单丝电阻率与其热导率的函数关系λ=152 740/(100ρ+22)-26,具有更强的普适性.%The axial electrical resistivity of individual pitch-based carbon fiber of six kinds carbon fibers was measured by a four-probe method.The thermal conductivity values were calculated by different empirical formulas,respectively and the calculated values were compared with the published values.The results show that the thermal conductivity values calculated from the formula λ =1261/ρ are consistent with these pitch-based carbon fibers with thermal conductivity over 600 or less than 300 W/(m· K).For the pitch-based carbon fiber that thermal conductivity is between 300 and 600 W/(m·K),its calculated thermal conductivity based on the formula λ =440000/(100ρ+258)-295 is more accurate.Based on this test,the relationship between the electrical resistivity of individual pitch-based carbon fiber and its thermal conductivity is established as λ =152740/(100ρ+22)-26,which has stronger universality.
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