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Promotion of the fragmentation and densification for a dense vacuum kinetic-sprayed Y2O3 coating by heat-treatment of feedstock powder

Title
Promotion of the fragmentation and densification for a dense vacuum kinetic-sprayed Y2O3 coating by heat-treatment of feedstock powder
Author
이창희
Keywords
Vacuum kinetic spraying (VKS); Mechanical property; Single-particle impact test; Transmission electron microscope (TEM); Powder heat treatment
Issue Date
2020-05
Publisher
ELSEVIER SCI LTD
Citation
CERAMICS INTERNATIONAL, v. 46, no. 7, page. 9016-9024
Abstract
Achieving a proper strength and properties of vacuum kinetic-sprayed (VKS) coatings has been a matter of issue. The heat-treatment of feedstock powder has been suggested as a solution to prevent porous microstructure of coatings. Unfortunately, there is still no study that clearly explains the effect of powder treatment on the two crucial deposition mechanisms in VKS (fragmentation and consolidation). Through observations and characterization of the coating microstructure and single-particle impact testing, the importance of the sufficient impact energy for dense VKS coatings is demonstrated. The results show that heat-treatment of Y2O3 powder resulted in improved mechanical properties of the coating and a dense coating structure. It is revealed that the larger heat-treated particles caused further size reduction of crystallites and consolidation via promotion of the intense fragmentation and intimate inter-crystallite bonding.
URI
https://www.sciencedirect.com/science/article/pii/S0272884219336284?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/166668
ISSN
0272-8842; 1873-3956
DOI
10.1016/j.ceramint.2019.12.149
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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