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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To find a proper super alloy applied to gasoline engine turbochargers which demand a high operating temperature over 950°C, the IN713C super alloy was investigated in this study. The rheological properties of feedstock, density, microstructure and mechanical properties were measured. The proper powder loading was 61 vol.-%. Through the analysis of viscosity, 160°C was supposed to be more suitable for the injection. After debinding, most binder components were removed. A reasonable debinding process was formulated. Two presintering temperature (850, 950°C) were investigated, then 850°C was considered to be more proper relatively. The samples were sintered at different temperatures for various time. The best properties of sintered parts were obtained when sintered at 1300°C for 3 h, the density of sintered parts was 7.83 g cm −3 while the hardness was 43.6 HRC and tensile strength was 1216.9 MPa.

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