碳热还原法制取Ti(C,N)的热力学原理  

Thermodynamic principle of preparing Ti(C,N) by carbon-heat reducing

作　　者：方民宪[1] 陈厚生[1] 

机构地区：[1]攀枝花钢铁研究院,攀枝花617000

出　　处：《粉末冶金材料科学与工程》2006年第6期329-336,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：国家863计划资助项目(2003AA33X210)

摘　　要：分析了以TiO2为原料,用碳热还原法制取Ti(C,N)的热力学原理。结果表明钛氧化物的还原是逐级进行的,反应过程伴随着相变,当TiO2粉末和C粉末均匀混合时还原碳化反应主要依赖于CO/CO2传质的气固反应,当TiO2颗粒表面被C包膜时主要是碳和钛氧化物之间的固固反应,当TiO2粉末和C粉末混合压球时则两种反应机理均有。升高温度有利于还原进行,钛氧化物的开始还原温度随气相中的CO分压降低而降低。Ti(C,N)中的C,N含量取决于温度和N2压力。Thermodynamic principle of making Ti（C, N） with TiP2 by carbon-heat reducing is analyzed. The resuh shows that synthesizing process goes along with phase change, the reducing of titanic oxide goes along gradually. When TiO2 powder and carbon grain are mixed, the reductive and carbonized reaction mainly depend on CO/CO2 gas-solid reaction. When surface of TiO2 powder is enveloped by carbon, the reduction is mainly solid-solid reaction between carbon and titanic oxide. When TiP2 powder and carbon grain are mixed and pressed into globosity, the reduction is either gas-solid or solid-solid reaction. It is beneficial to reducing process to increase temperature. The reduction initiative temperature of titanic oxide decreases with decrease of partial pressure of CO. But the content of C, N in Ti（C,N） depends on the temperature and partial pressure of N2.

关 键 词：TI(C N) 碳热还原 热力学 

分 类 号：TF123.3[冶金工程—粉末冶金] O614.411[冶金工程—冶金物理化学]