Investigation on carbonizing behaviors of nanometer-sized Cr2O3 particles on alumina particles by metalorganic chemical vapor deposition in fluidized bed

Hao Tung Lin, Jow Lay Huang, Wen Tse Lo, Wen Cheng J. Wei

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9 Citations (Scopus)

Abstract

Nanoscaled Cr2O3 powder with an average particle size of 20-40 nm, coated on alumina particles, has been produced by means of chemical vapor deposition (CVD) in a fluidized chamber, using the pyrolysis of Cr(CO)6 precursor. Amorphous and crystalline Cr2O3 particles were obtained when the temperatures of the pyrolysis were 300 and 400 °C, respectively. To prepare nanoscaled Cr3C2 powder from the nanometer-sized Cr2O3, carbonizing behavior of the Cr2O3 particles was investigated. It was found that, when amorphous Cr2O3 powders were carbonized in graphite furnace at 1150 °C for 2 h in vacuum (10-3 Torr), the powder was transformed into Cr3C2, while the crystalline Cr2O3 was transformed into a mixture of Cr7C3 and Cr3C2. The examinations by x-ray diffraction, transmission electron microscopy, and energy dispersive spectroscopy confirmed the transformation of the nano-sized Cr3C2 powders. The results of thermogravimetry and differential thermal analysis indicated that the transformation temperature was ∼1089 °C for amorphous Cr2O3 and ∼1128 °C for crystalline Cr2O3.

Original languageEnglish
Pages (from-to)2154-2160
Number of pages7
JournalJournal of Materials Research
Volume20
Issue number8
DOIs
Publication statusPublished - 2005 Aug

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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