A Study on the Kinetics of Carbothermal Reduction & Nitridation of Titanium Dioxide

• Main Authors: Cheng-Kuo Yu, 余建國
• Other Authors: Chun-I Lin
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/00891119641732068943

碩士 === 國立臺灣科技大學 === 化學工程研究所 === 83 === Carbothermal reduction and nitridation of titanium dioxide was investigated by X-rey diffraction and gas chromatograph. The effect of the following factors on the formation rate of TiNxCY has been studied:(1)flow rate of nitrogen(2)sample height(3)rea ction temperature(4)C/TiO2 molar ratio(5)grain size(6)initial bulk density of solid sample(7)carbon source and(8)TiO2 source. Experimental results indicated that anatase was transformated to rutile before it was reacted to produce TiN. The solid product of the reaction is the solid solution of TiN and TiC. The amount of TiN in the solution product may be increased by increasing the reaction temperature or decreasing the initial molar ratio of C/TiO2 . The gas products of the reaction are mostly CO and trace amount of CO2. The reaction rate was found to be increased by increasing the nitrogen flow rate , molar ratio of C/TiO2 or reaction temperature. The rate was also observed to be increased by decreasing the sample height , the grain size of carbon or titanium dioxide or initial bulk density Experimental results showed that a chemical reaction control region can be reached if the flow rate of nitrogen is higher than 1.5E-5 m3/s and the sample height is kept under 0.004 m . Empirical rate expressions of the yoeld of TiNxCy were also determined shown.