Study on property of high content Si_p/Al thermal management composite materials

High content Si_p/Al composite is a new kind of thermal management materials. Someone adopted Osprey or Squeeze infiltration methods to prepare the material. Si_p/Al composites were fabricated successfully by pressureless infiltration method for the first time in the paper. Al liquid infiltrate spontaneously into porous Si perform under N₂ atmosphere. It will be solidified subsequently under controlling to make a bulk composite. Furthermore, the process of infiltration, structure characteristics, and thermal physics properties were analyzed in the paper. We found that the high content Si_p/Al composite obtained by pressureless infiltration method is very different than Si_p/Al composites obtained by other methods. It have some particularly properties. The results show that of high volume content Si/Al composites is characterized by lower density (2.3-2.5 g/cm), high thermal conductivity (94.8-128.7 W/(m·K)), lower expand coefficient, ((5.1-7.8)×10^-6/K (50-100°C)) etc, and indicate that it has the basic characteristic of thermal management material. Contemporary, compared with other thermal management materials, the new material obviously excels as Cu-W, Fe-Ni alloy, Kovar alloy, SiC_p/Al composites and Si/Al composites fabricated by other process in thermal physics property.