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Dynamic evolution of oxide scale on the surfaces of feed stock particles from cracking and segmenting to peel-off while cold spraying copper powder having a high oxygen content

引用

Journal of Materials Science & Technology 2021年第8期67卷 105-115页

作者： Xiao-Tao Luo Yi Ge Yingchun Xie Yingkang Wei Renzhong Huang Ninshu Ma Chidambaram Seshadri Ramachandran Chang-Jiu Li State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China The Key Lab of Guangdong for Modem Surface Engineering Technology Guangdong Institute of New MaterialsGuangzhou510651China Joining and Welding Research Institute Osaka UniversityOsaka567-0047fapan Department of Materials Science and Engineering The State University of New York at Stony BrookNew York117942275USA

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 *** 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 *** 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 0.71μm.,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 ***-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 *** makes the successive particles to bond easily and thus leads to a higher ***,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 *** of the oxide scale threshold thickness for peeling-off during the high velocity particle impact was also investigated.

关键词： Cold spray Deposition efficiency oxide scale fragmentation Inter-particle bonding Electrical conductivity

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