分别添加不同含量的微米Al2O3（0．5～3μm）、微米Si3N4（O．3～3μm）和纳米Al2O3（13nm），利用共混法制备了具有不同导热性能的无机填料／硅橡胶复合材料。填料体积分数为30％时，通过改变微米Si3N4和纳米Al2O3体积比，发现微米Si3N4和纳米Al2O3共填充的硅橡胶复合材料的热导率较微米Si3N4／硅橡胶复合材料的热导率有显著提高，其中当微米Si3N4与纳米Al2O3体积比为26：4时，硅橡胶复合材料的热导率（1．64w／（m·K））约为单一微米Si3N4填充的硅橡胶复合材料热导率（O．52W／（m·K））的3倍。同时，微米Si3N4和纳米Al2O3共填充的硅橡胶复合材料有较高的击穿场强和优异的绝缘特性。
Filled with micro-Al2O3（0.5-3μm）, micro- Si3N4 （0.3-3μm） and nano- A12Os, different thermal conductive silicone rubber composites were prepared by the blending method. Micro- Si3 N4 and nano Al2O3 according to different volume ratio were compounded with silicone rubber and the total volume fraction was fixed at 30%. It is found that with the same volume fraction, the thermal conductivity of all the micro-Si3N4 and nano- Al2O3 co-filled composites have remarkable improvement compared with that of the composite filled with micro- Si3N4. Especially, when the volume ratio of micro-Si3N4 to nano （1.64 W/（m K）） is three times as high as that of th the same time, the micro - Si3N4 and nano - Al2O3 co breakdown strength and excellent insulating properties.
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