Nanosized chromium carbide has been prepared by metal-organic chemical vapour deposition (MOCVD) method in a fluidized bed and carburized in the mixture of CH4/H2 atmosphere in temperature range 700-850°C. The carburization process involves carbon deposition on the outer surface of the Cr2O3 powder, followed by carbon diffusion into the powder, leading to formation of metastable Cr3C2-x phase and stable Cr3C2. The phase transformation from Cr2O3 to Cr3C2 via an intermediate state Cr3C2-x has been identified using electron-energy loss spectroscopy (EELS) and micro-Raman spectroscopy. We could hypothesize that the formation of carbon nanofilms surrounding the carbide crystallites provides the stress and assist the phase transformation from metastable Cr3C2-x to stable Cr3C2.
|Number of pages||7|
|Journal||Journal of the European Ceramic Society|
|Publication status||Published - 2011 Nov|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry