Synthesis of (Cr,V)2(C,N) solid solution powders by thermal processing precursors

Liu, Anrui; Liu, Ying; Ma, Shiqing; Qiu, Yuchong; Rong, Pengcheng; Ye, Jinwen

doi:10.1016/j.matchemphys.2017.02.025

Cited by 10 publications

(2 citation statements)

References 21 publications

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“…Zhao et al [21] synthesized VN nanopowders by thermal nitridation of the precursor obtained by physically drying an aqueous solution of ammonium vanadate (NH 4 VO 3 ) and nanometer carbon black. (Cr,V) 2 (C,N) solid solution powders were synthesized by CRN of the precursor, prepared by heating admixtures of ammonium dichromate ((NH 4 ) 2 Cr 2 O 7 ), NH 4 VO 3 , and carbon black in distilled water with continuous stirring [22]. These methods can reduce the synthesizing temperature greatly, but the production cost remained high due to the use of de-ionized water, NH 4 VO 3 and nanometer carbon black, indicating the strong demand of a simple, low-cost and low-temperature approach to synthesize VN.…”

Section: Introductionmentioning

confidence: 99%

“…After solvent extraction and stripping, vanadium can be precipitated from the stripping solution with acidic ammonium salt [29]. In view of the preparation method of precursor [7,21,22] in the synthesis of VN, and the application of the precipitation method [30] to synthesize Pb(Mg 1/3 Nb 2/3 )O 3 ceramic, it may be feasible to prepare the precursor during the vanadium precipitation from the stripping solution in the process of vanadium extraction from black shale, to synthesize VN. This method revealed the merits of a low reaction temperature, short period, and a widely available, cheap vanadium source, which make it more practical, economical and efficient in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Vanadium Nitride Using a Thermally Processed Precursor with Coating Structure

Han

Zhang

Liu

et al. 2017

Metals

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Abstract:A new effective method is proposed to prepare vanadium nitride (VN) via carbothermal reduction-nitridation (CRN) of the precursor, obtained by adding carbon black (C) to the stripping solution during the vanadium recovery from black shale. VN was successfully prepared at a low temperature of 1150 • C for only 1 h with a C/V 2 O 5 mass ratio of 0.30 in N 2 atmosphere, but a temperature of 1300-1500 • C is required for several hours in the traditional CRN method. The low synthesis temperature and short period for the preparation of VN was due to the vanadium-coated carbon structure of the precursor, which enlarged the contact area between reactants significantly and provided more homogeneous chemical composition. In addition, the simultaneous direct reduction and indirect reduction of the interphase caused by the coating structure obviously accelerated the reaction. The phase evolution of the precursor was as follows: (NH 4 The precursor converted to V 6 O 13 and VO 2 completely after being calcined at 550 • C, indicating that the pre-reduction of V 2 O 5 in the traditional CRN method can be omitted. This method combined the synthesis of VN with the vanadium extraction creatively, having the advantages of simple reaction conditions, low cost and short processing time.

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Section: Introductionmentioning

confidence: 99%