Effects of Cu-Coated SiC Content on Microstructure and Properties of Laser Cladding SiCp/Al–Si Composite Coatings
Abstract
:1. Introduction
2. Materials and Methods
2.1. Substrate and Cladding Material
2.2. Electroless Plating of SiC Particles
2.3. Laser Cladding Experiment
3. Results and Discussion
3.1. Phase Analysis
3.2. Microstructural Analysis
3.3. Microhardness
3.4. Wear Properties
4. Conclusions
- 1)
- SiCp-reinforced aluminum matrix composite coatings with high microhardness can be successfully obtained on the surface of 4032 aluminum alloy by the laser cladding process. Electroless copper plating on SiCp can improve the properties of SiCp/Al–Si composite coating.
- 2)
- The microstructure of the SiCp-Cu/Al–Si laser cladding layer consisted of undissolved SiCp, lump-like primary Si, lump-like Al2Cu, plate-like Al4SiC4, and Al–Si–Cu ternary eutectic. Meanwhile, the microstructure became finer with the increasing of SiCp-Cu content due to the fast solidification.
- 3)
- The microhardness of the laser cladding layer increased with the increasing of SiCp-Cu content. It increased from 145 HV0.05 to 508 HV0.05 due to the presence of Al4SiC4 and Al–Cu intermetallic and finer microstructure.
- 4)
- The wear resistance of the laser cladding layer increased with the increasing of SiCp-Cu content. The LCL reinforced with a SiCp-Cu content of 30 wt.% exhibits the best wear resistance. When the SiCp-Cu content reached 40-50 wt.%, the wear resistance of the LCLs decreased due to the spalling of SiCp-Cu during the wear test.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Number | SiCp-Cu (wt.%) | SiCp (wt.%) | Al (wt.%) |
---|---|---|---|
1 | 0 | / | 100 |
2 | 10 | / | 90 |
3 | 20 | / | 80 |
4 | 30 | / | 70 |
5 | 40 | / | 60 |
6 | 50 | / | 50 |
7 | / | 20 | 80 |
Roughening Solution | Sensitizing Solution | Activating Solution | Plating Bath | |
---|---|---|---|---|
HF (40%) | 1.15 M | / | / | / |
HCl (37%) | / | 1.20 M | 0.24 M | / |
SnCl2 · 2H2O | / | 0.22 M | / | / |
PdCl2 | / | / | 2.82 mM | / |
CuSO4 · 5H2O | / | / | / | 40 mM |
NiSO4 · 6H2O | / | / | / | 5.42 mM |
NaH2PO4 · H2O | / | / | / | 0.38 M |
Na3C6H5O7 · 2H2O | / | / | / | 0.14 M |
H3BO3 | / | / | / | 0.48 M |
T (°C) | 25~30 | 25~30 | 25~30 | 65 |
pH | / | / | / | 10.5 |
t (min) | 15 | 15 | 15 | 10 |
SiCp-Cu (wt.%) | 2θ (°) | Intensity | FWHM | 2θ (°) | Intensity | FWHM |
---|---|---|---|---|---|---|
standard | 38.47 | 44.72 | ||||
10 | 38.49 | 1080 | 0.240 | 44.77 | 1817 | 0.262 |
20 | 38.56 | 1027 | 0.250 | 44.81 | 1005 | 0.283 |
30 | 38.53 | 1134 | 0.262 | 44.76 | 1467 | 0.284 |
40 | 38.48 | 449 | 0.294 | 44.74 | 226 | 0.356 |
50 | 38.41 | 630 | 0.252 | 44.66 | 326 | 0.304 |
Detection Positions | Al (wt.%) | Si (wt.%) | C (wt.%) | Cu (wt.%) |
---|---|---|---|---|
a | 26.03 | 50.01 | 2.40 | 21.56 |
b | 45.01 | 10.80 | 3.87 | 40.32 |
c | 32.30 | 11.15 | 36.94 | 20.62 |
d | 55.74 | 4.09 | 2.37 | 37.81 |
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Liu, Y.; Li, G.; Jiang, W. Effects of Cu-Coated SiC Content on Microstructure and Properties of Laser Cladding SiCp/Al–Si Composite Coatings. Materials 2019, 12, 1537. https://doi.org/10.3390/ma12091537
Liu Y, Li G, Jiang W. Effects of Cu-Coated SiC Content on Microstructure and Properties of Laser Cladding SiCp/Al–Si Composite Coatings. Materials. 2019; 12(9):1537. https://doi.org/10.3390/ma12091537
Chicago/Turabian StyleLiu, Yang, Guodong Li, and Wenting Jiang. 2019. "Effects of Cu-Coated SiC Content on Microstructure and Properties of Laser Cladding SiCp/Al–Si Composite Coatings" Materials 12, no. 9: 1537. https://doi.org/10.3390/ma12091537