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Materials 2017, 10(11), 1257; https://doi.org/10.3390/ma10111257

Electrochemical Synthesis of Core–Shell-Structured NbC–Fe Composite Powder for Enforcement in Low-Carbon Steel

1
Liaoning Key Laboratory for Metallurgical Sensor and Technology, School of Metallurgy, Northeastern University, Shenyang 110819, China
2
State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
3
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
*
Authors to whom correspondence should be addressed.
Received: 22 September 2017 / Revised: 27 October 2017 / Accepted: 30 October 2017 / Published: 1 November 2017
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Abstract

An NbC–Fe composite powder was synthesized from an Nb2O5/Fe/C mixture by electrochemical reduction and subsequent carbonization in molten CaCl2–NaCl. The composite has a core–shell structure, in which NbC acts as the cores distributing in the Fe matrix. A strong bonding between NbC and Fe is benefit from the core–shell structure. The sintering and electrochemical reduction processes were investigated to probe the mechanism for the reactions. The results show that NbC particles about several nanometers were embraced by the Fe shell to form a composite about 100 nm in size. This featured structure can feasibly improve the wettability and sinterability of NbC as well as the uniform distribution of the carbide in the cast steel. By adding the composite into steel in the casting process, the grain size of the casted steel was markedly deceased from 1 mm to 500 μm on average, favoring the hardening of the casted steel. View Full-Text
Keywords: NbC–Fe composite; core–shell-structured; electrochemical reduction; molten chloride; cast NbC–Fe composite; core–shell-structured; electrochemical reduction; molten chloride; cast
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Li, H.; Song, Q.; Xu, Q.; Chen, Y.; Xu, L.; Man, T. Electrochemical Synthesis of Core–Shell-Structured NbC–Fe Composite Powder for Enforcement in Low-Carbon Steel. Materials 2017, 10, 1257.

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