Metall. Res. Technol.
Volume 118, Number 3, 2021
|Number of page(s)||8|
|Published online||07 May 2021|
Study on the phase evolution and element migration of vanadium oxide during the nitridation process
College of Materials Science and Engineering, Chongqing University,
Chongqing, PR China
2 Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing University, Chongqing, PR China
* e-mail: firstname.lastname@example.org
Accepted: 23 March 2021
In this paper, a series of nitriding experiments were carried out to investigate the phase evolution and element migration in the nitriding process. The results show that it undergoes a low temperature reducing stage firstly. High valent vanadium oxides are reduced to V2O3 between room temperature and 770 °C. In Ar atmosphere, V2O3 reacts with C to form VC in the temperature interval of 770 °C∼1080 °C. In N2 atmosphere, V2O3 reacts directly with N2 and C to form VN in the interval of 670 °C∼1050 °C. During 1050 °C∼1270 °C, part of the VN obtained in the previous reaction stage will react with C to form VC. High temperature is beneficial to the removal of impurity element sulfur. The volatilization of alkali metal elements in the pellet mainly occurs between 670 °C and 1270 °C. However, there are about 20% of sodium and potassium remain in the nitriding product. The volatile alkali metal vapor would react with other gases at the furnace cover to form a white sediment and deposits on the cover. The sediment mainly consists of Na2CO3, K2CO3, Na2SO4, K2SO4, KCl, etc.
Key words: vanadium-nitrogen alloy / phase evolution / migration / alkali metal / volatilization
© EDP Sciences, 2021
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