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

Mani Mahajan; Shalini Rajpoot; O. P. Pandey

doi:10.1016/j.ijrmhm.2014.12.010

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

Mani Mahajan, Shalini Rajpoot, O. P. Pandey

Research output: Contribution to journal › Article › peer-review

33 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 language	English
Pages (from-to)	113-119
Number of pages	7
Journal	International Journal of Refractory Metals and Hard Materials
Volume	50
DOIs	https://doi.org/10.1016/j.ijrmhm.2014.12.010
State	Published - Mar 2015
Externally published	Yes

Keywords

Chemical-reduction route
Chromium carbide
Morphology
Thermal stability

Access to Document

10.1016/j.ijrmhm.2014.12.010

Cite this

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title = "In-situ synthesis of chromium carbide (Cr3C2) nanopowders by chemical-reduction route",

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.",

keywords = "Chemical-reduction route, Chromium carbide, Morphology, Thermal stability",

author = "Mani Mahajan and Shalini Rajpoot and Pandey, {O. P.}",

year = "2015",

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T1 - In-situ synthesis of chromium carbide (Cr3C2) nanopowders by chemical-reduction route

AU - Mahajan, Mani

AU - Rajpoot, Shalini

AU - Pandey, O. P.

PY - 2015/3

Y1 - 2015/3

N2 - 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.

AB - 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.

KW - Chemical-reduction route

KW - Chromium carbide

KW - Morphology

KW - Thermal stability

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