Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Deposition Behavior and Microstructure of Fe-based Amorphous Alloy Fabricated by Vacuum Kinetic Spraying Process

진공 저온 분사 공정을 통해 형성된 Fe계 비정질 재료의 적층거동 및 미세구조 변화 관찰

  • Kwon, Juhyuk (Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, College of Engineering, Hanyang University) ;
  • Park, Hyungkwon (Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, College of Engineering, Hanyang University) ;
  • Lee, Illjoo (Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, College of Engineering, Hanyang University) ;
  • Lee, Changhee (Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, College of Engineering, Hanyang University)
  • 권주혁 (한양대학교 신소재공학부 저온 분사 코팅 연구실) ;
  • 박형권 (한양대학교 신소재공학부 저온 분사 코팅 연구실) ;
  • 이일주 (한양대학교 신소재공학부 저온 분사 코팅 연구실) ;
  • 이창희 (한양대학교 신소재공학부 저온 분사 코팅 연구실)
  • Received : 2013.12.30
  • Accepted : 2014.01.08
  • Published : 2014.01.27
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Abstract

Fe-based amorphous coatings were fabricated on a soda-lime glass substrate by the vacuum kinetic spray method. The effect of the gas flow rate, which determines particle velocity, on the deposition behavior of the particle and microstructure of the resultant films was investigated. The as-fabricated microstructure of the film was studied by field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HR-TEM). Although the activation energy for transformation from the amorphous phase to crystalline phase was lowered by severe plastic deformation and particle fracturing under a high strain rate, the crystalline phases could not be found in the coating layer. Incompletely fractured and small fragments 100~300 nm in size, which are smaller than initial feedstock material, were found on the coating surface and inside of the coating. Also, some pores and voids occurred between particle-particle interfaces. In the case of brittle Fe-based amorphous alloy, particles fail in fragmentation fracture mode through initiation and propagation of the numerous small cracks rather than shear fracture mode under compressive stress. It could be deduced that amorphous alloy underwent particle fracturing in a vacuum kinetic spray process. Also, it is considered that surface energy caused by the formation of new surfaces and friction energy contributed to the bonding of fragments.

Keywords

References

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