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球型Al2O3-AlN 颗粒复配填充型硅橡胶的制备及导热性能研究

Study on the Preparation and Thermal Conductivity of Silicone Rubber Filled with Spherical Al2O3-AlN Particles

  • 摘要: 以 Al2O3 和 AlN 的球形粉体颗粒作为导热填料、以硅橡胶为基体, 通过特定的工艺手段得到具有高导热特征的 Al2O3-AlN/硅橡胶复合材料。结果表明:根据颗粒级配理论模型的计算可得最密堆积配方, 该配方的复合材料在 9.6 wt% 填料填量下的热导率可高达 9.6 W/(m·K), 其热导率相比只填充 Al2O3颗粒的样品提高了 60%。复合材料热导率的显著提高和样品内部导热路径的增多密切相关。通过极端的冷热循环应用条件模拟测试, 该复合材料的热导率保持良好, 表现出了良好的可靠性。

     

    Abstract: Al2O3-AlN/silicone rubber composites with high thermal conductivity were prepared by using Al2O3 and AlN as thermally conductive fillers. By using theory of granulartity, we obtained the densest packing of fillers in the polymer composites. The results showed that the thermal conductivity of the composites reached up to 9.6 W/(m·K) at the loading of 96 wt%, which was 60% higher than that filled with Al2O3. The significant increase of the thermal conductivity of the composites resulted from the increase of the internal thermal conductivity of the sample. Although the composites have undergone extreme cold and hot cycle application conditions, the thermal conductivity of the composites was maintained well, showing excellent reliability.

     

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