Electrical Characterization of Carbon Nanotube Reinforced Silver and Copper Composites for Switching Contacts
Abstract
:1. Introduction
2. Materials and Methods
2.1. MMC Production
- CNT dispersion and metallic powder mixture (colloidal mixing process);
- Cold pressing (consolidation of green pellet);
- Sintering (densification via HUP).
2.2. Characterization Techniques
3. Results and Discussions
3.1. Powder Characterization
3.2. Characterization of Sintered MMC
3.3. Electrical Tests
3.3.1. Load-Dependent ECR
3.3.2. Fatigue Cycles
4. Conclusions
- Not only does particle size play an important role in CNT integration but also particle morphology, with the larger-sized copper powder showing better CNT deposition than the smaller-sized silver powder;
- Green pellets formed with silver flakes present an abundance of internal micro-pores. Consequently, a re-pressing post process with prolonged isothermal holding times was required to achieve acceptable silver composite densities;
- The MMC produced did not show the reinforcement effect due to the prolonged sintering process at relatively elevated temperatures. As a consequence, the composites showed low hardness values, which in turn allowed the hard counter electrode to imprint onto the composites’ surfaces—an effect that was more noticeable in the softer silver composites. Nonetheless, the addition of CNT reduced the contact resistance throughout all normal loads measured, with higher concentrations producing the lowest resistance values. Higher CNT concentrations also produced highly reproducible contact surfaces;
- All MMC outperformed the reference material in fatigue tests, rapidly reaching steady-state ECR values and maintaining low resistance throughout the 20 fatigue cycles measured.
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Reinforcement Concentration/wt.% | Ag-p * | Ag ** | Cu | |
---|---|---|---|---|
Relative density/% | 0.5 | 64 | 99 | 95 |
0.75 | 74 | 92 | 99 | |
1 | 78 | 99 | 99 | |
Hardness/MPa | 0 *** | 847 ± 61 | - | 1335 ± 82 |
0.5 | - | 515 ± 21 | 582 ± 93 | |
0.75 | - | 351 ± 18 | 467 ± 96 | |
1 | - | 505 ± 37 | 619 ± 88 |
Roughness Prior to ECR/nm | Roughness Post-ECR/nm | Imprint Diameter/µm | |
---|---|---|---|
Ag 0% | 10 ± 10 | 40 ± 10 | 47.7 ± 4.4 |
Ag 0.5% | 20 ± 10 | 100 ± 10 | 87.2 ± 1.5 |
Ag 0.75% | 40 ± 10 | 130 ± 20 | 119.9 ± 5.1 |
Ag 1% | 60 ± 10 | 110 ± 10 | 98.2 ± 2.1 |
Cu 0.5% | 10 ± 10 | 110 ± 20 | 95.2 ± 5.9 |
Cu 0.75% | 10 ± 10 | 120 ± 20 | 101.5 ± 3.6 |
Cu 1% | 10 ± 10 | 110 ± 20 | 94.2 ± 2.8 |
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Alderete, B.; Mücklich, F.; Suarez, S. Electrical Characterization of Carbon Nanotube Reinforced Silver and Copper Composites for Switching Contacts. J. Compos. Sci. 2023, 7, 284. https://doi.org/10.3390/jcs7070284
Alderete B, Mücklich F, Suarez S. Electrical Characterization of Carbon Nanotube Reinforced Silver and Copper Composites for Switching Contacts. Journal of Composites Science. 2023; 7(7):284. https://doi.org/10.3390/jcs7070284
Chicago/Turabian StyleAlderete, Bruno, Frank Mücklich, and Sebastian Suarez. 2023. "Electrical Characterization of Carbon Nanotube Reinforced Silver and Copper Composites for Switching Contacts" Journal of Composites Science 7, no. 7: 284. https://doi.org/10.3390/jcs7070284