The structure and phase composition acquired by coatings deposited in optimum mode by the plasma arc spraying process were examined. The spraying materials were wires with a steel sheath and nB4C + 100 – n(Cr, Fe)7C3 cores. The coatings have a ferrite matrix doped with Cr, B, and C and hardened with Fe3(B, C), Cr2B, FeCr, and boron carbide particles. When the (Cr, Fe)7C3 amount in the wire increases from 30 to 50 wt.%, the matrix phase (α-Fe-based solid solution) content decreases from 65.8 to 37.6 wt.% and the weight content of the hardening phases increases from 28.2 to 59.3%. These processes improve hardness of the coatings to 6.25 and 8.6 GPa, respectively. All coatings are characterized by a fine lamellar structure and high adhesion to the substrate. They exhibit high density and low porosity (<2.5%) and their hardness exceeds that of the wire steel sheath by 4.0 to 5.5 times. The plasma arc coatings can be used as wear-resistant materials for protection of chemical engineering equipment against abrasive wear, in the production of parts for pumps, compressors, and other machines, and for the recovery of worn parts.
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Translated from Poroshkova Metallurgiya, Vol. 58, Nos. 5–6 (527), pp. 82–97, 2019.
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Grigorenko, G.M., Adeeva, L.I., Tunik, A.Y. et al. Structurization of Coatings in the Plasma Arc Spraying Process Using B4C + (Cr, Fe)7C3-Cored Wires. Powder Metall Met Ceram 58, 312–322 (2019). https://doi.org/10.1007/s11106-019-00080-1
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DOI: https://doi.org/10.1007/s11106-019-00080-1