Low temperature synthesis of Cr7C3-V8C7-MgCr2O4 nanocomposite via a magnesiothermic-assisted mechanochemical method. Issue 17 (1st December 2018)

• Record Type: Journal Article
• Authors: Eilbeigi, S.; Hassanzadeh-Tabrizi, S.A.; Khodaivandi, A.
• Is Part Of: Ceramics international. Volume 44:Issue 17(2018)
• Page Start: 21437
• Page End: 21441
• Publication Date: 2018-12-01
• Subjects: Mechanochemical -- Nanocomposite -- Magnesiothermic reaction, Metal carbides; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.08.203
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In the present research, Cr7 C3 -V8 C7 - MgCr2 O4 nanocomposite was directly synthesized via a one-step magnesiothermic-assisted mechanochemical method from V2 O5 –CrO3 –Mg–C mixture. The reduction of metal oxides to metal carbides was done during milling without any further heat treatment. Transmission electron micrographs revealed that Cr7 C3 -V8 C7 -MgCr2 O4 composite with a particle size ranging from 40 to 300 nm can be synthesized after 3 min of milling via a mechanically induced self-sustaining reaction. Leaching treatment with hydrochloric acid removed MgO and purified the composite particles. Based on the experimental results and thermodynamic calculations, reaction mechanism for the formation of Cr7 C3 -V8 C7 -MgCr2 O4 composite is discussed.