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Materials Science in Additive Manufacturing Cold spray additive manufacturing of Cu-based materials

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C

Figure 12. Scanning electron microscopy micrographs and powder size distributions of (A) Cu-5CNT, (B) Cu-5CNT-10SiC, and (C) Cu-5CNT-20SiC .
[45]
(Reprinted from Ceramics International, 41(5), Pialago, E. J. T., Kwon, O. K., and Park, C. W., Cold spray deposition of mechanically alloyed ternary Cu–
CNT–SiC composite powders, 6764 – 6775, 2015, with permission from Elsevier).
copper coatings. The deposition efficiency decreased to effect was not so pronounced in Cu+Al O coating work
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0.12 with the addition of CNT (copper 5CNT coatings). done by Winnicki et al. as mentioned above earlier.
However, copper-5CNT-20AlN coatings had slightly However, after 18 cycles of Kesternich test in a sulfur
better deposition efficiency than copper-5CNT-10AlN dioxide environment, the buckling of copper-SiC coatings
coatings. It was also reported that there were small pores was evident. As reported, the electrolyte having the sulfate
in copper-5CNT-10AlN and copper-10CNT-20AlN that ions was penetrating into the coating. Furthermore, it was
open toward the surface as compared to copper-5CNT claimed by the author that SiC might be serving as an inert
coatings. Furthermore, copper-5CNT-10AlN coatings electrode, facilitating the galvanic corrosion, resulting in
were rougher as well as porous than copper-5CNT-20AlN the delamination of copper-SiC coatings, which is not the
coatings. The pore volumes and surface roughness were case with copper-alumina coatings. This lack of corrosion
the least for copper-5CNT-20AlN coatings compared to resistance also resulted in a decrease in the electrical
the copper-5CNT-10AlN and copper coatings. conductivity of as-sprayed copper-SiC coatings. The
reported electrical conductivity values were 49% IACS for
4.3. Copper-silicon carbide cermet coatings as-sprayed copper-SiC coatings and around 20% IACS for
[30]
Winnicki et al. manufactured and studied the corrosion both cases of corrosion tests (salt spray test and Kesternich
[30]
resistance of copper-SiC coatings. In their work, after test) for copper SiC coatings .
18 cycles of salt spray test, the copper SiC coatings showed Recently, Chen et al. cold-sprayed copper-SiC
[47]
good corrosion resistance and the buckling of coatings coatings along with pure copper, copper- Al O , and
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was not so pronounced. As reported by the author, this copper-WC coatings. The compositions made were pure
could be because of the high amount of SiC particles in the copper, copper-alumina (15 wt.%), copper-SiC (15 wt.%),
coating creating a high amount of ceramic-metal interface, and copper-WC (15 wt.%). As reported, the density of
leading to the penetration of chloride ions in them. This SiC·Al O , WC were 3.2 g/cm , 3.5 g/cm , and 15.63 g/cm .
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Volume 1 Issue 2 (2022) 10 https://doi.org/10.18063/msam.v1i2.12