錫/錫圧接界面強度に及ぼすフッ化水素酸によるハロゲン化処理の影響

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The effect of halogenation treatment by hydrofluoric acid on bond strength of pressure welded joint of tin have been investigated by SEM observations of the interfacial microstructures and fractured surfaces. The halogenation treatment was carried out by exposing a tin surface (finished by electrolytic polishing) in hydrofluoric acid vapor in a closed container for 30s. The pressure welding was carried out in a vacuum chamber at bonding temperatures T_j of 353〜443K and under a bonding pressure of 7MPa (bonding time=1.8ks). The bond strength of the joint was increased with a rise in bonding temperature. The halogenation treatment decreased bonding temperature by 40K at which bonded joints could be obtained and bond strength comparable to the base metal was achieved. SEM observations of the joint interface revealed that massive particles of a few μm in size were distributed at the interface. As the bonding temperature was increased, the particles coarsened and decreased in number densities, leaving the surrounding area with much smaller amounts of inclusions distributing in the tin substrate than those of the Sn-oxide observed at the joint interface bonded without the halogenation treatment at the same bonding temperature. The formation and enlargement of the areas with much smaller amounts of inclusions in the interfacial region probably contributed to the increase in the bond strength at lower bonding temperature by the halogenation treatment.
2010-09-25

錫/錫圧接界面強度に及ぼすフッ化水素酸によるハロゲン化処理の影響

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