With the increasing integration density and power density of electronic products.It is particularly important to optimize the research of thermal interface materials.In this paper,one-dimensional silicon carbide whisker(SiCw)was used as filler and silicone rubber was used as matrix to prepare thermal conductive silicone rubber composites.The microstructure,phase structure,thermal conductivity and insulation of the composites were comprehensively analyzed.Firstly,the modified material of SiCw coated by Fe3O4 was prepared by coprecipita-tion method.Secondly,SiCw coated with Fe3O4 was evenly dispersed in the liquid silicone rubber matrix.Finally,it is placed in a constant magnetic field to complete whisker orientation and matrix curing.The results show that the surface of SiCw whiskers is coated with Fe3O4 nanoparticles,and they are oriented in the silicone rubber matrix.Silicone rubber composites with SiCw oriented structure were prepared.When the oriented SiCw reaches 10wt%,the thermal conductivity can be increased by 72%compared with pure silicone rubber,and it is 40%higher than that filled with non-oriented 10wt%SiCw.Compared with pure silicone rubber,the volume resistivity decreases by two orders of magnitude.But it still has good insulation.The silicone rubber composites with randomly dispersed and oriented SiCw were simulated by COMSOL.The simulation results show that the thermal conductivity of silicone rubber can be improved by 60%with 10wt%SiCw.The volume resistivity is above 1015 Ω∙cm.However,10wt%oriented SiCw can improve the thermal conductivity of silicone rubber by 170%and the volume resistivity is above 1014 Ω∙cm.It is consistent with the trend of experimental results.
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