Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Ti-based Quasicrystal Layers Produced by Plasma Thermal Spraying

  • Takasaki, Akito (Center for Energy Flow Research, Research Organization for Advanced Engineering and Department of Mechanical Engineering, Shibaura Institute of Technology) ;
  • Uematsu, Susumu (Advanced Maritime Transport Technology Department, National Maritime Research Institute) ;
  • Kelton, K.F. (Department of Physics and Center for Materials Innovation, Washington University)
  • Published : 2006.09.24
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Abstract

[ $Ti_{45}Zr_{38}Ni_{17}$ ] powders were thermally sprayed onto mild steel substrates in air and under a reduced pressure of argon. Several oxides were formed after thermally-spraying the mechanically-alloyed powders in air. After spraying in a reduced pressure of argon, the coating layers obtained from the gently mixed powders consisted of the elemental metals, but an amorphous phase primarily appeared in the thermally-sprayed mechanically-alloyed powders, which transformed into the icosahedral quasicrystal phase and a minor $Ti_2Ni-type$ crystal phase after annealing at 828 K. The Vickers hardness and the contact angle with pure water for the quasicrystal layers were about 7 GPa and $92^{\circ}$ respectively.

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