Abstract
Compared with other thermal spray technologies, cold spray relies on high-speed impact of solid particles. Generally, cold spray cannot deposit on surfaces that are positioned in low incident angle, so it is critical to understand the impact of incident angle to improve the properties of the coating in uneven or curved surfaces. In this work, pure Cu coatings were obliquely deposited on Cr-Zr-Cu substrates using high-pressure cold spray (CS) system. The influence of particle incident angle from 60° to 90° on the surface characteristics, mechanical properties and thermal conductivity of coating was studied. Results showed that increasing the incident angle of Cu particles resulted in a more compact coating. As the incident angle changed from 60° to 90°, the thickness of Cu coatings increased by 42.7%. The high micro-hardness exceeding 120 HV was maintained due to the low porosity and pure Cu particles deformation strengthening, which is close to that of 145 HV of Cr-Zr-Cu substrate. The thermal conductivity tests revealed that the superior thermal conductivity was obtained at incident angle of 90°. The results could be discussed in terms of the deformation modes of pure Cu particles and interface properties of the coatings.
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The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (Nos.12075071 and 11875119) and Heilongjiang Touyan Innovation Team Program (HITTY-20190013).
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Zhou, C., Gong, C., Wang, Z. et al. Effect of Particle Incident Angle on the Hardness and Thermal Conductivity of Cu Coating Applied to a Cr-Zr-Cu Substrate using High-Pressure Cold Spray. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09189-w
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DOI: https://doi.org/10.1007/s11665-024-09189-w