Journal of Welding and Joining

  • 제25권4호
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  • Pages.35-41
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  • 2007
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  • 2466-2232(pISSN)
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  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
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저온분사 공정에서 알루미늄 분말의 산화가 임계 적층 속도에 미치는 영향

Oxidation Effect on the Critical Velocity of Pure Al Feedstock Deposition in the Kinetic Spraying Process

  • 강기철 (한양대학교 신소재공학과) ;
  • 윤상훈 (한양대학교 신소재공학과) ;
  • 지율권 (한양대학교 신소재공학과) ;
  • 이창희 (한양대학교 신소재공학과)
  • Kang, Ki-Cheol (Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University) ;
  • Yoon, Sang-Hoon (Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University) ;
  • Ji, Youl-Gwun (Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University) ;
  • Lee, Chang-Hee (Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University)
  • 발행 : 2007.08.31
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초록

In kinetic spraying process, the critical velocity is an important criterion which determines the deposition of a feedstock particle onto the substrate. In other studies, it was experimentally and numerically proven that the critical velocity is determined by the physical and mechanical properties and the state of materials such as initial temperature, size and the extent of oxidation. Compared to un-oxidized feedstock, oxidized feedstock required a greater kinetic energy of in-flight particle to break away oxide film during impact. The oxide film formed on the surface of particle and substrate is of a relatively higher brittleness and hardness than those of general metals. Because of its physical characteristics, the oxide significantly affected the deposition behavior and critical velocity. In this study, in order to investigate the effects of oxidation on the deposition behavior and critical velocity of feedstock, oxygen contents of Al feedstock were artificially controlled, individual particle impact tests were carried out and the velocities of in-flight Al feedstock was measured for a wide range of process gas conditions. As a result, as the oxygen contents of Al feedstock increased, the critical velocity increased.

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참고문헌

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