Anisotropic stacked epoxy composites with excellent thermal properties
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摘要: 基于导热-隔热原理，通过在环氧树脂(Epon)中添加质量分数为5%，15%，25%的六方氮化硼(h-BN)作为填料制备环氧基散热层，质量分数为1%的膨胀蛭石(E-ver)作为填料制备环氧基隔热层，设计了宏观交替堆叠的环氧复合材料，并进行了热防护性能的研究。研究结果表明：具有各向异性结构的复合材料，顶部中心温度较传统材料的温度下降13～16 ℃，热延迟时间大大提升，并随着h-BN含量的增加，热性能得到明显改善。理论分析了该堆叠结构下复合材料“横向散热、纵向抑热”的机理。Abstract: With the rapid development of high-power lasers and electronic technology, higher requirements have been proposed for the structure and material of the heat sink device. Based on the principle of conduction-insulation heat, alternating stack epoxy resin composites with excellent thermal protection were prepared, the hexagonal boron nitride (h-BN: 5%, 15%, 25%) and expanded vermiculite (E-ver: 1%) are used as fillers for heat dissipation layer and thermal insulation layer, respectively. The thermal protection performance experiment was completed. The result shows that the temperature of the top center is 13−16 °C lower than that of the traditional materials, and the thermal delay time is greatly improved. An increase in the h-BN content causes an increase in the thermal protection properties of the composites. The thermal mechanism of the anisotropic stacked composites was explained.
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图 1 堆叠复合材料制备原理图
Figure 1. Schematic illustration of the preparation of the multilayered composites
图 3 （a）堆叠结构样品模型；（b）复合材料横截面的光学显微镜图（c）h-BN（25%质量分数）散热微层的扫描电镜图；（d）膨胀蛭石（1%质量分数）隔热微层的扫描电镜图
Figure 3. (a) The sample model of stacked composites; (b) The optical microscope image of interfacial morphology; (c) The SEM image of h-BN(25%) filled epoxy resin composites; (d) The SEM image of E-ver (1%) filled epoxy resin composites.
图 4 （a）样品顶部温度随时间变化曲线；（b）样品侧边温度随时间变化曲线（底部为80 ℃面热源）
Figure 4. (a) Top center temperature curves of composites; (b) side-pointing temperature curves (the bottom is 80 ℃)
图 5 （a）各向异性堆叠复合材料热防护机理图；（b）样品顶部温度随时间变化曲线（底部为120 ℃面热源）
Figure 5. （a）Heat transfer mechanism of multilayered composites；（b）Top center temperature curves of composites (bottom is 120 ℃)
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