期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 67, 期 -, 页码 105-115出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.06.019
关键词
Cold spray; Deposition efficiency; Oxide scale fragmentation; Inter-particle bonding; Electrical conductivity
资金
- National Natural Science Foundation of China [51875443]
- Guangdong Basic and Applied Basic Research Foundation [2019B1515120016, 202002030290]
- Shaanxi Co-Innovation Projects [2015KTTSGY03-03]
- Shaanxi Natural Science Foundation [2015JQ5200]
- Key Lab of Guangdong for Modern Surface Engineering Technology
- Guangdong Academy of Sciences' Project of Constructing First-class Domestic Research Institutions [2019GDASYL-0503006, 2020GDASYL20200302011]
Breakage of the oxide scale is crucial for inter-particle bonding in the cold spray coating process, leading to improved deposition efficiency. A study demonstrates that artificially oxidized copper powder with a thick oxide scale can significantly enhance deposition efficiency.
The oxide scale present on the feedstock particles is critical for inter-particle bond formation in the cold spray (CS) coating process, therefore, oxide scale break-up is a prerequisite for clean metallic contact which greatly improves the quality of inter-particle bonding within the deposited coating. In general, a spray powder which contains a thicker oxide scale on its surface (i.e., powders having high oxygen content) requires a higher critical particle velocity for coating formation, which also lowers the deposition efficiency (DE) making the whole process a challenging task. In this work, it is reported for the first time that an artificially oxidized copper (Cu) powder containing a high oxygen content of 0.81 wt.% with a thick surface oxide scale of 0.71 mu m., can help achieve an astonishing increment in DE. A transition of surficial oxide scale evolution starting with crack initiations followed by segmenting to peeling-off was observed during the high velocity particle impact of the particles, which helps in achieving an astounding increment in DE. Single-particle deposit observations revealed that the thick oxide scale peels off from most of the sprayed powder surfaces during the high-velocity impact, which leaves a clean metallic surface on the deposited particle. This makes the successive particles to bond easily and thus leads to a higher DE. Further, owning to the peeling-off of the oxide scale from the feedstock particles, very few discontinuous oxide scale segments are retained at inter-particle boundaries ensuring a high electrical conductivity within the resulting deposit. Dependency of the oxide scale threshold thickness for peeling-off during the high velocity particle impact was also investigated. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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