日本金属学会誌

J. Japan Inst. Metals, Vol. 36, No. 12 (1972),
pp. 1257-1263

Hydrolysis of Titanium Nitrides and Carbides

Bunkei Kyo1, Kumao Uchida1 and Shosuke Imoto2

1Department of Nuclear Engineering, Faculty of Science and Engineering, Kinki University, Higashiosaka
2Department of Nuclear Engineering, Faculty of Engineering, Osaka University, Suita

Abstract:

Studies were made on the hydrolysis of the titanium mononitride and carbide by superheated steam kept at temperatures from 600 to 950°C. In the case of TiN the reaction products were mainly N2, H2 and the solid residue TiO2. The amount of NH3 was too little to be traced for the change of the reaction. The predominant reaction equation for the hydrolysis of TiN0.81 was found to be:

TiN0.81+2H2O → TiO2+0.81 α NH3+0.41(1-α)N2+(4-2.43 α)/2H2
where α covered from 0.02 to 0.08. A small amount of NO gas was also observed. Upon the hydrolysis of TiC, CO, CO2, H2 and a small amount of CH4 were produced and the initiation temperature of the reaction was lower than that for TiN. The amount of CO was the largest at the highest hydrolysis temperature, and CO2 the lowest. The reaction could be given by the equation:
TiC+(4-β)H2O → TiO2+β CO+(1-β)CO2+(4-β)H2
where β varied with temperature from 0.04 at 600°C to 0.76 at 950°C. In the hydrolysis at higher temperatures, it was observed that a larger amount of H2 than that expected from the above equation evolved preceding the CO2 evolution. One possible explanation for this might be that some amount of CO produced at the early stage of the hydrolysis was contained within the solid residue and later converted into CO2 by the steam-gas reaction.


(Received 1972/9/2)

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