Abstract
An experimental study has been made on the carbothermic reaction of ThN with graphite in the form of loose powder mixture in vacuo. The effects of reaction temperature and particle size were examined. The graphite and ThN powders were mixed in proportions representing molecular ratios of about unity. Three kinds of samples of different particle sizes were utilized. Gravimetric measurements on the reaction were made sothermally in the temperature range of 1,420°~1,630°C. For these samples of different particle sizes, the reaction kinetics were represented in common by first-order plots for the early part of the reaction. The apparent activation energies were about 60kcal/mol for the three samples. X-ray examination revealed the reaction products to be mainly ThCxN1-x′ with some ThC2 and/or ThC1-x′ N1-x′ in the case of the fine and the medium particle size samples. As for the coarse powder, the products were identified to be ThCx′N1-x and ThCx′N1-x′ without any ThC2. As the reaction proceeded, each carbonitride took up more carbon and at the same time the carbon-rich carbonitride increased in quantity and the other decreased.
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