Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Microstructure Evolution of Cu-based BMG Coating during APS Process and Phase Analysis by Nano-indentation Test

대기 플라즈마 용사공정을 이용한 Cu계 벌크 비정질 금속 코팅의 미세조직 분석과 나노 압입시험을 이용한 상 분석

  • 김정환 (한양대학교 신소재공학과) ;
  • 강기철 (한양대학교 신소재공학과) ;
  • 윤상훈 (한양대학교 신소재공학과) ;
  • 나현택 (한양대학교 신소재공학과) ;
  • 이창희 (한양대학교 신소재공학과)
  • Published : 2009.12.31
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Abstract

In this study, Cu-based bulk metallic glass (BMG) coatings were deposited by atmospheric plasma spraying (APS) process with different process conditions (with- and without hydrogen gas). As adding the hydrogen gas, thermal energy in the plasma flame increased and induced difference in the melting state of the Cu-based BMG particles. The microstructure and mechanical properties of the coatings were analyzed using a scanning electron microscope (SEM) with an energy dispersive spectroscopy (EDS) and nano-indentation tester in the light of phase analysis. It was elucidated by the nano-indentation tests that un-melted region was a mainly amorphous phase which showed discrete plasticity observed as the flow serrations on the load.displacement (P - h) curves, and the curves of solidified region showed lower flow serrations as amorphous phase mingled with crystalline phase. Oxides produced during the spraying process had the highest hardness value among the phases and were well mixed with other phases resulted from the increase in melting degree.

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References

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