导热氧化铝改性工艺对界面材料导热性能的影响研究

为提高界面材料的导热性能,采用不同工艺对界面材料用导热氧化铝填料进行改性研究,通过考察导热氧化铝填料的形貌、添加量、复配比例对界面材料导热性能的影响,选取导热氧化铝填料最佳性价比配方和改性工艺。实验结果表明：当导热氧化铝填料以45 μm球形、45 μm类球形、5 μm角形按2∶3∶2质量比进行复配并进行干法-湿法联合改性时,其添加量可以达到95%（占有机硅油体系的质量分数）,导热系数可以达到4.25 W/（m·K）。

Effect of modification process of thermal conductive alumina on thermal conductivity of interfacial materials

In order to improve the thermal conductivity of the interfacial materials,different processes were adopted to study the thermal conductive alumina fillers for interfacial materials.The effect of morphology,adding amount and proportion of the thermal conductive alumina fillers on the thermal conductivity of the interface materials were investigated,and the optimum cost perfor-mance ratio formula and modification process of thermal conductive alumina filler were selected.The experimental results showed that when the thermally conductive alumina filler for the interface material was compounded in a mass ratio of 2∶3∶2 in 45 μm spherical,45 μm like-spherical and 5 μm angular shapes and undergoes a combined dry-wet modification,the adding amount can reach 95%（accounting for the mass fraction of the silicone oil system）,and the thermal conductivity can reach 4.25 W/（m·K）.