摘要
不透性石墨材料由于其优异的防腐性能和导热性能,在氯碱、石油化工、农药、冶金等领域得到广泛应用,对于现代工业的节能降耗、防腐减排的贡献巨大,不透性石墨材料是多孔且各向异性材料,国内对不透性石墨材料导热性能研究少之又少.本文对比了各类导热系数测试方法,选择操作简便、重复性高、相对偏差较小的比较法来开展研究.研究结果表明,石墨原材料颗粒度越小,不透性石墨材料导热系数越大;浸渍次数越多,不透性石墨材料导热系数越小.为提高不透性石墨材料导热系数测量准确度,样品应套上保温套筒,端面涂上导热硅胶,且测量样品高度与标准样品高度应控制在±1％左右.
Abstract
Impermeable graphite materials,due to their excellent corrosion resistance and thermal conductivity,are widely used in the chlor-alkali,petrochemical,pesticide,and metallurgical industries,making a significant contribution to modern industry in terms of energy saving,consumption reduction,and anti-corrosion and emission reduction.Currently,impermeable graphite materials are porous and anisotropic,and there is a lack of research on the thermal conductivity of impermeable graphite materials in China.This paper compares various thermal conductivity measurement methods and selects the comparative method,which is easy to operate,has high repeatability,and relatively small relative deviation,for the research.The results show that the smaller the particle size of the graphite raw material,the greater the thermal conductivity of the impermeable graphite material,the more the impregnation times,the greater the thermal conductivity of the impermeable graphite material.To improve the accuracy of the measurement of the thermal conductivity of impermeable graphite materials,the sample should be fitted with a thermal insulation sleeve,and the end face should be coated with thermal conductive silicone,and the height of the measured sample and the standard sample should be controlled within±1％.
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