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考虑环境热损失,建立了单根碳纤维沿轴向的导热方程,得到了碳纤维热参数与交流加热信号的频域特性之间的关系.建立了适用于微细导电线或丝的3ω测试系统.利用3ω方法同时测量了单根碳纤维沿轴向的导热系数和热容.在室温下测量了Pt丝的导热系数和热容,验证了建立的实验系统的合理性,利用该方法测量的直径为7 μm单根碳纤维沿轴向的导热系数和热容分别为84.35 W·m-1·K-1和1.19 MJ·m-3·K-1.给出了实验测量的不确定度分析.建立的实验系统可用于单根碳纳米管或导电纳米线热参数的表征.

参考文献

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[3] L. M. Manocha;A. Warrier;S. Manocha .Thermophysical properties of densified pitch based carbon/carbon materials--II. Bidirectional composites[J].Carbon: An International Journal Sponsored by the American Carbon Society,2006(3):488-495.
[4] Gallego NC.;Nysten B.;Issi JP.;Treleaven JW.;Deshpande GV.;Edie DD. .The thermal conductivity of ribbon-shaped carbon fibers[J].Carbon: An International Journal Sponsored by the American Carbon Society,2000(7):1003-1010.
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[6] Lu L.;Zhang DL.;Yi W. .3 omega method for specific heat and thermal conductivity measurements[J].Review of Scientific Instruments,2001(7):2996-3003.
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