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Nylon 6 (PA6) thermal conductive composites were prepared by melt blending with different sizes of spherical Al 2 O 3 and AlN and the filling amount was 60 wt%. This paper explored the effects of different particle sizes and filler kinds on the thermal conductivity and mechanical properties of the composites. The results showed that the composites filled with AlN and spherical Al 2 O 3 had higher thermal conductivity than the composites filled with single filler under the same filling amount. When the mass ratio of 48 μm spherical Al 2 O 3 and 14 μm AlN was 1:2, the thermal conductivity and thermal diffusivity was 2.44 W/(m•K) and 0.72 mm 2 /s, respectively. In addition,the tensile strength was 57.50 MPa and the impact strength was 6.13 KJ/m 2 . By comparing actual thermal conductivity value with the theoretical value calculated by Agari model, we found that actual value of alumina filling was close to the theoretical value.

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