Abstract
Copper–chromium carbide composites containing a carbide phase of 20–30 vol% were obtained with the use of solid- and liquid-phase mechanosyntheses, followed by magnetic pulse compaction (MPC) and spark plasma sintering. The morphology, structural-phase composition, density, hardness and electrical conductivity of the composites were investigated. The structure of composites obtained by MPC represents regions of copper matrix hardened by superfine carbide precipitates surrounded by a layer of chromium carbide. In the composites obtained by spark plasma sintering, the copper matrix hardened by superfine carbide precipitates was divided into areas surrounded by a copper–chromium layer. A composite obtained by the MPC of the powders synthesized using solid-phase mechanosynthesis (MS) (copper, chromium and graphite) had the highest values of Vickers microhardness (4.6 GPa) and Rockwell hardness (HRA 69). The best value of electrical conductivity (36% IACS) was achieved using liquid-phase MS (copper, chromium and xylene) and spark plasma sintering. Liquid-phase MS is the only way to synthesize the powder with a small amount of the carbide phase and without contamination.
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Acknowledgements
This work was supported by the Government of the Russian Federation (Federal Agency for Scientific Organizations) under the themes of the state task, no. 0389-2014-0002 and no. 0428-2014-0002 and by the Program of UD RAS, Project reg. no. AAAA-A17-117040610324-3.
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Eryomina, M.A., Lomayeva, S.F., Paranin, S.N. et al. Effect of the method for producing \(\hbox {Cu}\)–\(\hbox {Cr}_{3}\hbox {C}_{2}\) bulk composites on the structure and properties. Bull Mater Sci 40, 1021–1028 (2017). https://doi.org/10.1007/s12034-017-1457-2
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DOI: https://doi.org/10.1007/s12034-017-1457-2