181 0

Effect of gas flow rate on deposition behavior of Fe-based amorphous alloys in vacuum kinetic spray process

Title
Effect of gas flow rate on deposition behavior of Fe-based amorphous alloys in vacuum kinetic spray process
Author
이창희
Keywords
Fe-based amorphous alloy; Bulk metallic glass (BMG); Vacuum kinetic spray (VKS); Porous film; Deposition behavior
Issue Date
2014-12
Publisher
Elsevier Science B.V
Citation
Surface & Coatings Technology, 2014, 259, P.585-593
Abstract
Amorphous Fe-based coatings were fabricated on soda-lime glass substrates by the vacuum kinetic spray (VKS) method. The effects of gas flow rate on the deposition behavior, the coating microstructure, and properties were investigated. The deposition mechanism of bulk metallic glass (BMG) material was also analyzed. The as-fabricated film microstructure was studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and high resolution transmission electron microscopy (TEM). Moreover, atomic force microscopy (AFM) and a scratch tester were used to measure the surface roughness and cohesive/adhesive bonding strength, respectively. The deposition rate was drastically increased as the gas flow rate increased, and the film was significantly thicker than that of ceramics. Also, the particles underwent more severe deformation and fragmentation as the particle velocity increased, similar to a ceramic material. However, interestingly, a porous film was fabricated in contrast to a ceramic film, and the porosity increased with increasing gas flow rate. It is thought that the cohesive bonding strength was constant regardless of gas flow because of the porous coating layer, while adhesive strength significantly increased by an anchoring layer as the gas flow increased. Based on the fact that no crystalline phases except for ZrO2 were found in the coating layer, fragmentation is still an important process for successful deposition in a VKS system compared to the KS process. As a result, it can be concluded that the plasticity-accompanied fragmentation process of BMG particles resulted in a porous coating layer in contrast to the dense ceramic coating formed by the fragmentation-dominant deposition process. (C) 2014 Published by Elsevier B.V.
URI
https://www.sciencedirect.com/science/article/pii/S0257897214009268?via%3Dihub
ISSN
0257-8972
DOI
10.1016/j.surfcoat.2014.10.026
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE