アルミニウム合金中に形成する化合物の結晶成長制御と新規高熱伝導性ヒートシンク材料への適用

抄録

  Al-Si alloy die-casting materials are expected to be used as a heat dissipation product (heat sink) for a head lamp of automobile, because of their superior castability. Their low thermal conductivity, however, hinders their use for a heat dissipation product. Currently, the heat dissipation property could be improved by surface treatments such as painting, however, it is important to improve the thermal conductivity of Al-Si alloy itself. In this research, the crystal growth of intermetallic compounds, which were formed in Al matric was controlled in order to increase the thermal conductivity. The novel Al-Si alloy was successfully developed under the collaboration research between academia and industry. This alloy had a large volume of intermetallic compounds in the microstructure, resulting in the decrease of solute content of solute atoms in Al matrix and then the increase of thermal conductivity.