Hybrid fillers of silicon carbide/glass fibres (SiC/GFs) are used to prepare SiC/GFs/bismaleimide (SiC/GFs/BMI) composites. Results show that the thermal conductivities of the SiC/GFs/BMI composites improved with the increasing content of SiC fillers, and the thermal conductivity coefficient is 1.64 W mK−1 with 60 wt% modified SiC fillers. The heat resistance properties and dielectric constant values of the SiC/GFs/BMI composites also improved with the increasing content of SiC fillers. Furthermore, surface modification of SiC fillers is beneficial for further improving the thermal conductivities of the composites.
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