錫／錫の固相接合界面の酸化皮膜に対する酢酸による改質効果

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  • Effect of Surface Modification by Acetic Acid on Superficial Oxide Film of the Solid-State Bonded Joint of Tin
  • スズ スズ ノ コソウ セツゴウ カイメン ノ サンカ ヒマク ニ タイスル サクサン ニ ヨル カイシツ コウカ

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  The effect of acetic acid surface modification on the superficial oxide film that covers the solid-state bonded joint of tin has been investigated by conducting SEM and TEM observations of the interfacial microstructures and fractured surfaces. Acetic acid surface modification was carried out by boiling a tin surface in acetic acid for 900 s. Solid-state bonding was carried out in a vacuum chamber at a bonding temperature T of 403-483 K and a bonding pressure P of 7 MPa (bonding time=1800 s). It was observed that the bond strength increased with the bonding temperature, regardless of the acetic acid surface modification. Because of surface modification, bonded joints were obtained at a bonding temperature that was 40 K lesser than the typical temperature required, and the bond strength was comparable to that of the base metal. When the joint strength was much lower than the base metal strength, belt-like inclusions were found to be distributed in the interfacial region. As the joint strength increased with bonding temperature, these inclusions were coarsened, and their distribution density decreased. The increase in bond strength with bonding temperature corresponded well with the observed change in the size and density of the inclusions. This tendency was observed at a bonding temperature that was 40 K lesser than that of the joint that did not undergo surface modification. Therefore, it is believed that the joint that underwent surface modification possessed a high tensile strength despite having a low bonding temperature; this is because tin (II) acetate coheres at a temperature lower than required for the coherence of an oxide film, and the area of the metal-to-metal contact increased at a low temperature.<br>

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  • 日本金属学会誌

    日本金属学会誌 74 (11), 733-739, 2010

    公益社団法人 日本金属学会

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