Low-temperature synthesis of nanodispersed titanium, zirconium, and hafnium carbides

被引：39
|
作者：
Sevastyanov, V. G. [1 ,2 ]
Simonenko, E. P. [1 ,2 ]
Ignatov, N. A. [1 ]
Ezhov, Yu S. [3 ]
Simonenko, N. P. [2 ]
Kuznetsov, N. T. [1 ]
机构：
[1] Russian Acad Sci, NS Kurnakov Gen & Inorgan Chem Inst, Moscow 119991, Russia
[2] Lomonosov State Acad Fine Chem Technol, Moscow 117571, Russia
[3] Russian Acad Sci, Joint Inst High Pressures, Inst Thermophys Extreme States, Moscow 127412, Russia
来源：
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY | 2011年 / 56卷 / 05期
关键词：
AB-INITIO; SOL-GEL; TI-C; POWDERS; PLASMA; NANOPARTICLES; NANOPOWDERS; FABRICATION; PRECURSORS; COMPOSITE;
D O I：
10.1134/S0036023611050214
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Nanosized refractory titanium, zirconium, and hafnium carbides were manufactured from highly dispersed metal dioxide-carbon starting mixtures at moderate temperatures of 1200A degrees C or lower. The products were characterized by powder X-ray diffraction, elemental analysis, and transmission electron microscopy. The average size of particles (in nanometers) manufactured at 1200A degrees C was as follows: for TiC, 13 +/- 4; for ZrC, 17 +/- 3; and for HfC, 16 +/- 3; the average crystallite size (in nanometers) was as follows: for TiC, 8 +/- 2; for ZrC, 5 +/- 2; and for HfC, 8 +/- 3. Thermodynamic modeling was performed for the synthesis of Group IVB carbides via carbothermal reduction of the corresponding oxides. The results show that in the titanium dioxide-carbon system, for example, titanium monocarbide formation is possible at a temperature as low as 850A degrees C (p = 10(-4) MPa). Highly dispersed metal dioxide-carbon starting mixtures were prepared using solgel technology from metal alkoxyacetylacetonates in the presence of a polymeric carbon source.
引用
收藏
页码：661 / 672
页数：12
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