Powders of Chromium and Chromium Carbides of Different Morphology and Narrow Size Distribution

Powders of Cr and Cr carbides (Cr 2C, Cr 7C 3, and Cr 23C 6) have been prepared by hydrogen reduction of CrO 1.9 and Cr 3C 2 powders of different morphology, texture and specific surface area. The Cr and Cr carbides particles have the morphology of the parent compound and a narrow size distribution....

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Bibliographic Details
Published in:Materials research bulletin 1998-06, Vol.33 (6), p.935-944
Main Authors: Loubière, S, Laurent, Ch, Bonino, J.P, Rousset, A
Format: Article
Language:English
Subjects:
A. carbides
A. oxides
Chemical Sciences
Chemistry
Colloidal state and disperse state
Engineering Sciences
Exact sciences and technology
General and physical chemistry
Material chemistry
Materials
Powders
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Summary:Powders of Cr and Cr carbides (Cr 2C, Cr 7C 3, and Cr 23C 6) have been prepared by hydrogen reduction of CrO 1.9 and Cr 3C 2 powders of different morphology, texture and specific surface area. The Cr and Cr carbides particles have the morphology of the parent compound and a narrow size distribution. Depending on the shape, the average size is of the order of some micrometers or some tens of micrometers. Starting with Cr 3C 2 allows the preparation of Cr powders at a temperature (1000°C) markedly lower than that required when CrO 1.9 is used as the precursor (1300°C). However, a Cr 3C 2 specific surface area of the order of 10 m 2/g is necessary to achieve this within a reasonably short time (6 to 12 h). Powders of the lower carbides are prepared by using a milder hydrogen thermal treatment.
ISSN:0025-5408
1873-4227
DOI:10.1016/S0025-5408(98)00062-2