In-situ synthesis of chromium carbide (Cr3C2) nanopowders by chemical-reduction route

Mani Mahajan, Shalini Rajpoot, O. P. Pandey

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Chromium carbide nanopowder (Cr3C2) has been synthesized from chromium oxide (Cr2O3) by chemical-reduction route under autogenic pressure of hydrogen and CO gases at 87 MPa. The reduction of Cr2O3 to Cr3C2 has taken place at a relatively low temperature (700 °C) in the presence of Mg in an autoclave. The increased pressure of hydrogen and CO gases facilitates the reduction and carburization simultaneously which helps in reducing the reaction temperature. The nanopowder shows faceted morphology as observed in TEM. High resolution transmission electron micrographs reveal that the size of Cr3C2 powders varies in the range of 30-40 nm and is coated by 12-13 layers of carbon with average thickness of 3.5-4 nm. Thermal stability of the as-obtained product was investigated by TGA/DTA analysis. Based on the experimental results, possible reaction mechanism for the transformation and formation of nanopowder is discussed in the light of the obtained structure.

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalInternational Journal of Refractory Metals and Hard Materials
Volume50
DOIs
StatePublished - Mar 2015
Externally publishedYes

Keywords

  • Chemical-reduction route
  • Chromium carbide
  • Morphology
  • Thermal stability

Fingerprint

Dive into the research topics of 'In-situ synthesis of chromium carbide (Cr3C2) nanopowders by chemical-reduction route'. Together they form a unique fingerprint.

Cite this