電析Ni-W合金めっき膜の微細構造と熱平衡状態図との関係

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  • 伊藤 清
    東京都立大学大学院工学研究科応用化学専攻
  • 王 峰
    東京都立大学大学院工学研究科応用化学専攻
  • 渡辺 徹
    東京都立大学大学院工学研究科応用化学専攻

書誌事項

タイトル別名
  • Relationship between the Crystallographic Structure of Electrodeposited Ni-W Alloy Film and Its Thermal Equilibrium Diagram
  • デンセキNi W ゴウキンメッキ マク ノ ビサイ コウゾウ ト ネツ ヘイコウ ジョウタイズ ト ノ カンケイ

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抄録

Electrodeposited Ni-W alloy films were obtained from Nickel Sulfate baths containing Na2WO4. The crystallographic structure and morphology of electrodeposited Ni-W films were studied by XRD, HRTEM, SEM and heat-treatment technique. The crystallographic structures of electrodeposited Ni-W alloy films were also compared with the Ni-W thermal equilibrium diagram.<BR>The X-ray diffraction patterns of Ni-W electrodeposited films with various W contents gradually changed from sharp peaks to broad peaks with increasing W contents in electrodeposited films. HRTEM observation revealed that the crystallographic structure of electrodeposited Ni-W film with 19.7 at%W content was crystalline and its crystal size was about 10 nm. Moreover, the crystalline structure was observed and the crystal size was about 5 nm in the electrodeposited Ni-W alloy film with 24.4 at%W content. However, when the film with 24.4 at%W content was heat treated, the crystalline phase did not grow and an unknown phase (Ni4W?) existed alone under 600°C heat-treatment. From this result, it was clear that the crystallographic structure of Ni-W film with 24.4 at%W content was amorphous.<BR>Therefore, it can be concluded that the microcrystalline phase existed up to 22 at%W in electrodeposited Ni-W alloy film and the amorphous phase existed from 22 at% to 35 at%W.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 65 (11), 1023-1028, 2001

    公益社団法人 日本金属学会

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