摘要
通过热力学计算,探讨了埋炭气氛下碳热、铝热和硅热还原TiO2生成Ti(C,N)的可能性、生成途径、生成产物的相对稳定性以及对3种还原反应进行了对比。结果表明:埋炭气氛下,3种还原反应均可发生且生成的钛的非氧化物是以Ti(C,N)形式存在;在铝热和硅热反应中,不稳定的中间产物AlN和Al4C3会转为稳定的刚玉相,而Si3N4则转化为稳定的碳化硅或方石英;通过比较发现,碳热还原TiO2法是制备钛的非氧化物陶瓷最经济有效的方法。
Titanium carbonitride （ Ti （ C, N） ） was obtained from reduction of TiO2 by carbon, aluminum and silicon in the presence of CO and N2. In this paper, the possibility, route and stability of resultants in different systems under the nitrogen and carbon monoxide were investigated by the thermodynamic calculation. The comparison of preparing Ti （C, N） for C-TiO2 system, Al-TiO2 system and Si-C-TiO2 system was carried out. The results indicate that Ti（ C, N） can be produced in the three systems and the carbothermal reduction of TiO2 is one of the most effective method to prepare Ti（ C, N）. In the Al-TiO2 system, the possible intermediate phases of AlN, Al4C3 are converted to α-Al2O3, in the Si-C-TiO2 system, the possible intermediate phase of Si3 N4 is translated into cristobalite or SiC.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2007年第1期162-167,共6页
Bulletin of the Chinese Ceramic Society
基金
湖北省自然科学基金资助
关键词
碳热法
铝热法
硅热法
热力学
埋炭气氛
carbothermal method
aluminothermal method
silicothermal method
thermodynamics
reducing atmosphere
