以尼龙(PA)为基体、三氧化二铝(Al2 O3)为导热填料经熔融共混、模压成型后制得尼龙导热复合材料.通过扫描电子显微镜、导热分析仪对复合材料微观形貌、导热性能进行表征.结果表明,Al2 O3在尼龙基体中具有良好的分散性；Al2 O3填料含量、粒径和形貌都对复合材料导热率有影响,当粒径为5μm 的片状Al2 O3的填充量达到50％(质量分数)时,其导热率可达0．838 W/(m·K)；不同形貌的Al2 O3填料复配使用可以有效构建导热通路、提高复合材料热扩散系数,但会降低材料热容、使复合材料导热系数减小.
The thermal conductive nylon (PA6)/Al2 O3 composites were prepared by melt blending and hot-press method.The microstructure and thermal conductive properties of the composites were characterized by scanning electron microscopy and thermal conductive analyzer.The results showed that Al2 O3 particles were homogene-ously dispersed in PA matrix.And the filler content,particle size,morphology of Al2 O3 had obvious influence on the thermal conductivity of the composites.When the loading of lamellar Al2 O3 with 5μm diameter reached 50%,the thermal conductivity of the composite was up to 0.838 W/(m·K).Compounding Al2 O3 with differ-ent morphologies could construct the thermal conductive path,which increased the thermal diffusivity and de-creased the heat capacity.
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