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运用瞬态平面热源法(Transient Plane Source-TPS)对4种孔隙率的泡沫铜/石蜡复合材料热物性进行了测量。以10μm厚的镍金属按双螺旋线布置作为测量探头。泡沫铜材料孔隙率分别为ε=97.79%、ε=96.17%、ε=94.94%和ε=93.26%,经线切割加工后向内灌入液态石蜡,凝固后作为测试样品。在室温(25±1℃)和常压下对复合材料的等效导热系数、热容及热扩散率进行了测量。测试结果表明:复合材料导热系数和热扩散率因泡沫铜的加入而大幅提高,在孔隙率ε=93.26%时,等效导热系数已达到单纯石蜡的25倍,而复合材料等效热容则由于铜金属加入的绝对量较少相对原石蜡热容变化较小。以比例加成的方法对泡沫铜/石蜡复合材料的等效热容进行了计算,并利用实验数据拟合了其等效导热系数的计算公式,运用这些公式对复合材料物性的计算结果与实验结果非常吻合。
The thermal properties of 4 porous foam copper / paraffin composites were measured by using Transient Plane Source-TPS. A 10 μm-thick nickel metal was arranged as a double-helix measurement probe. The porosity of foamed copper material is respectively ε = 97.79%, ε = 96.17%, ε = 94.94% and ε = 93.26%. The liquid paraffin is poured inward after the wire cutting and solidified and used as the test sample. The equivalent thermal conductivity, heat capacity and thermal diffusivity of the composites were measured at room temperature (25 ± 1 ℃) and atmospheric pressure. The results show that the thermal conductivity and thermal diffusivity of the composites increase greatly due to the addition of foam copper. The equivalent thermal conductivity has reached 25 times that of pure paraffin at the porosity of 93.26%, while the equivalent heat capacity Due to the absolute amount of copper added less relative paraffin wax heat capacity changes smaller. The equivalent heat capacity of foam copper / paraffin composites was calculated by the method of ratio addition. The calculation formulas of equivalent thermal conductivity of the foamed copper / paraffin composites were calculated by using the experimental data. The calculation results of the physical properties of the composites and the experiment The results are very consistent.