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采用熔融共混方法制备了尼龙/玻纤(GF)/氧化镁(Mg O)导热绝缘复合材料。考察了导热粉体氧化镁(Mg O)含量、不同粒径粉体复配对复合材料外观、导热性能、散热性能及微观形态的影响。结果表明:复合材料的导热性能随着Mg O含量的增加而提高,合理的粒径复配有利于改善材料外观并提高导热性能,且材料的导热系数直接影响LED灯芯片的温度;扫描电子显微镜(SEM)显示,Mg O的加入能有效促进GF的分散,且自身能均匀地分布于尼龙基体中。
Nylon / glass fiber (GF) / magnesia (MgO) thermal conductive insulation composites were prepared by melt blending method. The effects of magnesium oxide (MgO) content and different particle sizes on the appearance, thermal conductivity, heat dissipation and microstructure of the composites were investigated. The results show that the thermal conductivity of the composites increases with the increase of MgO content. The reasonable particle size distribution can improve the appearance and thermal conductivity of the material, and the thermal conductivity of the material directly affects the temperature of the LED chip. Scanning electron microscopy (SEM) shows that the addition of MgO can effectively promote the dispersion of GF, and can distribute itself uniformly in the nylon matrix.