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Investigation on Carbonizing Behaviors of Nanometer-sized Cr2O3 Particles Dispersed on Alumina Particles by Metalorganic Chemical Vapor Deposition in Fluidized Bed

Published online by Cambridge University Press:  01 August 2005

Hao-Tung Lin ,
Jow-Lay Huang ,
Wen-Tse Lo  and
Wen-Cheng J. Wei
Hao-Tung Lin
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan, Republic of China
Jow-Lay Huang*
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan, Republic of China
Wen-Tse Lo
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan, Republic of China
Wen-Cheng J. Wei
Affiliation:
Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China
*
a) Address all correspondence to this author.e-mail: JLH888@mail.ncku.edu.tw
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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.

Keywords

CarbonizationChemical vapor deposition (CVD)Nanoscale
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 8 , August 2005 , pp. 2154 - 2160
Copyright
Copyright © Materials Research Society 2005

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