Al₂O₃/Fe 焼結複合材の溶融 Pb フリーハンダに対する熱衝撃・濡れ特性の評価

抄録

  High solder wettability and thermal shock resistance are necessary for materials used for soldering tips. The thermal shock resistance of metal/ceramic composites was investigated, and each influencing factor is discussed in this study. The composites that have enough thermal shock resistance to be used as soldering tips are discussed. In addition, the factors that influenced the wettability of the composite material were investigated in order to improve the reliability of the solder wettability. The thermal shock characteristic of a Fe-added composite was clearly superior to a Ni-added composite. Both 20 mass% and 80 mass% Fe-added composites had greater wettability than Ni-added composites, and this led to a decrease in the thermal shock temperature difference ΔT_C and bending strength σ_BT following thermal shock. The solder wettability of metal/ceramic tips are dependant upon the surface temperature and heating time of the specimen. This decreased susceptibility to thermal shock was thought to be due to differences in the surface oxidation behavior caused by the tip heating condition. It is necessary to strictly limit those conditions in order to reliably evaluate wettability.