Aluminide Coating on Niobium by Arc Surface Alloying

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  • Matsuura Kiyotaka
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Koyanagi Takayuki
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Ohmi Tatsuya
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Kudoh Masayuki
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

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Other Title
  • アーク表面合金化によるニオブのアルミナイド被覆
  • アーク ヒョウメン ゴウキンカ ニ ヨル ニオブ ノ アルミナイド ヒフク

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Abstract

A new method for surface modification based on the arc surface alloying has been proposed and its feasibility has been investigated performing niobium aluminide coating on a niobium base metal. When tungsten arc was used to melt an aluminum plate placed on a niobium block, the niobium surface was also melted and a melt pool of an Al-Nb binary alloy was formed on the niobium block. The melt pool solidified into niobium aluminides on the surface of the niobium block, forming a thick NbAl3 layer on the top surface of the coating layer. When an Al-Si alloy plate was used instead of the aluminum plate, a niobium aluminosilicide layer was formed on the niobium block.

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