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| Preparation of Cr2(C,N) powders by carbothermal reduction-nitridation method in open system |
| CHEN Zhenlei1，MA Shiqing1，2，ZHANG Luokun1，WANG Yiman1，JIAO Penggang1，
YANG Zhigang1，2 |
| 1. School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2. Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment, Shijiazhuang
050043, China |
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Abstract Single phase Cr2(C,N) powder was prepared by carbothermal reduction nitridation method, with carbon
black and chromium oxide as raw materials in an open system. By means of TG-DSC, XRD and SEM, the effects
of synthesis parameters, including heating temperature, holding time and nitrogen flow rate on the preparation of
Cr2(C,N) were studied. The results show that with the heating temperatures increase, the phase evolution follows
the sequences of Cr2O3→(Cr2O3, Cr3C2 and Cr6.2C3.5N0.3)→Cr2(C,N). When temperatures reach 1 100 ℃, the single
phase Cr2(C,N) powder can be obtained. The optimal parameters of synthesis Cr2(C,N) powders, with the prefer
phase constitution, particle size and nitrogen content, are 1 200 ℃ for 2 h under the nitrogen flow rate of 2.5 L/min.
It contributes to increasing the nitrogen content of Cr2(C,N), while increase synthesis temperatures, prolong holding
time and improve the nitrogen flow rate appropriately.
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Received: 08 July 2021
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Corresponding Authors:
马世卿（1989—），男，博士，副教授，主要研究方向为硬质材料及其在轨道交通中的应用。
E-mail: shiqing_ma@stdu.edu.cn
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2022, Vol. 32 
