孔隙率对炭材料电阻率的影响

Effect of porosity on the electrical resistivity of carbon materials

摘要: 依据经典流体力学理论，建立了真实密度和孔隙率对炭素材料电阻率影响规律的模型。模型计算结果表明，真实密度对炭素材料的电阻率影响较小，偏差小于3%；开孔气孔率对电阻的影响大于闭孔气孔率，开孔气孔率增加40%时电阻率增加了250%，而相同幅度闭孔气孔率的增加引起电阻率的增加值只有25%。模型计算结果与实测值偏差小于2%，表明模型具有较好的精度。

Abstract: A model describing the effect of true density and porosity on the electrical resistivity of carbon materials is developed based on ideal fluid mechanics. The modeling results are in good agreement with experimental data with a largest deviation of 2%. Open porosity has a greater effect on resistivity than closed porosity. An increase of open porosity by 40% leads to a resistivity increase by 250% while the same increase in closed porosity gives rise to a resistivity increase of only 25%. The influence of true density on electrical resistivity is not significant.