A metastable chromium carbide powder obtained by carburization of a metastable chromium oxide
A metastable chromium carbide powder obtained by carburization of a metastable chromium oxide
复制标题
DOI：
10.1016/s0925-8388(96)02384-5
复制
发表时间：
1996-10
影响因子：
6.2
通讯作者：
S. Loubière;C. Laurent;J. Bonino;A. Rousset
中科院分区：
文献类型：
--
作者：
S. Loubière;C. Laurent;J. Bonino;A. Rousset
A metastable Cr3C2−xcarbide powder is prepared by carburization of a metastable chromium oxide in H2CH4atmosphere under the appropriate conditions (temperature, dwell time and CH4content). A very high specific surface area (greater than 210 m2g1) of the starting oxide is necessary to avoid the formation of the sole stable Cr3C2phase. The transformation from the stable Cr3C2−xto the metastable Cr3C2, is observed for the first time. The driving force could be an epitaxial effect between Cr3C2−xand the surrounding graphite layer. This is consistent with the observation that the formation of graphite layers by CH4cracking is easier in the Cr3C2−x-containing powders.
