Ultrafine carbide powders of Fe-Si-C and WC
1-x were prepared utilizing a new radiofrequency thermal plasma system and their chemical properties were examined.
Ultrafine Fe-Si-C powders were prepared in the plasma from the reactant gases of SiH
4-CH
4-Fe(CO)
5. Phases of powders were classified to two groups; one is composed of β-FeSi
2, which was very active for the selective formation of olefin in the Fischer-Tropsch reaction, the other is of α-Fe, Fe
3Si and Fe
5Si
3, which gave high CO conversion. Ultrafine WC
1-x powder in the phase of 90-95 wt% with the particle diameter of 5-20nm was obtained from the reactant gases in the mole ratio of CH
4/WO
3 with over than 15. It was stable thermally below 1, 000°C under Ar atmosphere but it began to decompose to W
2C over 1, 000°C. Ultrafine WC
1-x powder promoted catalytically the formation of n-butane in the hydrogenation of cis-2-butene.
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