RGO/Cu – Zr – La alloy produced by repeated pressing and sintering is studied. The effect of the reduced graphene oxide (RGO), Zr and La components on the microstructure, mechanical properties, conductivity, and oxidation resistance of the alloy is studied. It is shown that precipitation of RGO and Zr on grain boundaries hinders displacement of the grain boundaries. The mechanical characteristics of the RGO/Cu – Zr – La alloy grow as a result of redistribution of high loads and the Orowan mechanism. As compared to pure Cu, the microhardness and the rupture strength of alloy RGO/Cu – Zr – La increases by 51.4% and 27.1% respectively. The oxidation resistance of the alloy increases too. The main causes of these effects are the layer of lanthanum oxide surrounding the Cu particles and the barrier effect of the RGO lamellas between oxygen and the Cu matrix.
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IACS (International Annealed Copper Standard) is the ratio (in %) of the conductivity of the material studied to that of pure copper at 20°C.
References
X. Qiao, Q. Shen, L. Zhang, et al., “A Novel method for the preparation of Ag/SnO2 electrical contact materials,” Rare Met. Mater. Eng., 43, 2614 – 2618 (2014).
X.Wang, Y. Hao, C. Mei, et al., “Fabrication and arc erosion behaviors of AgTiB2 contact materials,” Powder Technol., 256, 20 – 24 (2014).
M. Zhang, X. H. Wang, X. H. Yang, et al., “Arc erosion behaviors of AgSnO2 contact materials prepared with different SnO2 particle sizes,” J. Nonferr. Metal. Soc., 26, 783 – 790 (2016).
Z. Y. Pan, J. B. Chen, and L. I. Jin-Fu, “Microstructure and properties of rare earth-containing Cu – Cr – Zr alloy,” J. Nonferr. Metal. Soc., 25, 1206 – 1214 (2015).
J. Zhou, D. Zhu, L. Tang, et al., “Microstructure and properties of powder metallurgy Cu – 1% Cr – 0.65% Zr alloy prepared by hot pressing,” Vacuum, 131, 156 – 163 (2016).
S. Stankovich, S. A. Dikin, R. D. Piner, et al., “Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide,” Carbon, 45, 1558 – 1565 (2007).
F. Y. Chen, K. M. Ying, Y. F. Yang, et al., “Effects of graphene content on the microstructure and properties of copper matrix composites,” Carbon, 96, 836 – 842 (2016).
X. M. Liu, S. L. Wu, P. K. Chu, et al., “Effects of coating process on the characteristics of AgSnO2 contact materials,” Mater. Sci. Eng. A, 98, 477 – 480 (2006).
L. Dong,W. Chen, N. Deng, et al., “Investigation on arc erosion behaviors and mechanism of W70Cu30 electrical contact materials adding graphene,” Alloys Compd., 696, 923 – 930 (2017).
H. J. Noh, J. W. Kim, S. M. Lee, et al., “Effect of grain size on the electrical failure or copper contacts in fretting motion,” Tribol. Int., 111, 39 – 45 (2017).
T. Varol and A. Canakci, “Microstructure, electrical conductivity and hardness of multilayer graphene/copper nanocomposites synthesized by flake powder metallurgy,” Met. Mater. Int., 21, 704 – 712 (2015).
W. Zhai, X. Shi, M. Wang, et al., “Grain refinement: A mechanism for graphene nanoplatelets to reduce friction and wear of Ni3Al matrix self-lubricating composites,” Wear, 310, 33 – 40 (2014).
J. Hwang, T. Yoon, S. H. Jin, et al., “Enhanced mechanical properties of graphene/copper nanocomposites using a molecular-level mixing process,” Adv. Mater., 25, 6724 – 6729 (2013).
C. Zhou, H. Kang,W.Wang, et al., “Effect of La addition on the particle characteristics, mechanical and electrical properties of in situ Cu – TiB2 composites,” Alloys Compd., 687, 312 – 319 (2016).
L. I. Hai-Yan, X. Zhou, L. U. Xue-Qiong, et al., “Effect of La on arc erosion behaviors and oxidation resistance of Cu alloys,” J. Nonferr. Metal. Soc., 27, 102 – 109 (2017).
The authors are obliged to the anonymous reviewers for extremely helpful comments and would like to acknowledge the support from the Natural Science Foundation of the Jiangxi Province (Grant No. 20171BAB206006), the Key Project of the Science and Technology Project of the Jiangxi Provincial Education Department (Grant No. GJJ160678), the Foundation of the Jiangxi Educational Committee (GJJ160684, GJJ161363), and the Key Laboratory of Nondestructive Testing of the Ministry of Education (ZD201529006).
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 50 – 54, March, 2020.
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Cai, R., Li, G., Hu, L. et al. Effect of Reduced Graphene Oxide on the Properties of Cu – Zr – La Alloy for Electrical Contacts. Met Sci Heat Treat 62, 229–233 (2020). https://doi.org/10.1007/s11041-020-00540-1
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DOI: https://doi.org/10.1007/s11041-020-00540-1