Glass fiber-reinforced epoxy resin (GFRE) composites filled with aluminum nitride (AlN) powder were fabricated, and their thermal and electrical properties were investigated. It is observed that with the increasing percentage of AlN particles, there is a significant enhancement in thermal conductivity and micro-hardness, but there is a decline in tensile strength. Experimental results demonstrate that the GFRE composites with 10 wt% of AlN loading show maximum dielectric breakdown strength of 30.26 kV/mm with minimum volume resistivity of 7.5 × 1014 Ω cm and thermal conductivity value of 0.300 W/mK. Scanning electron microscopy studies were conducted to observe the voids and distribution of filler in composites.
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