稀土氧化物Ce_2O_3制备Al-Ti-C-RE的热力学分析  

Thermodynamics analysis of Al-Ti-C-RE prepared by rare earth oxide Ce_2O_3

作　　者：王连登[1,2] 魏喆良[1] 杨小宝[1] 朱定一[2] 陈晓[1] 陈永禄[3] 洪丽华[3] 李秋菊[1] 

机构地区：[1]福州大学机械工程及自动化学院,福州350108 [2]福州大学材料科学与工程学院,福州350108 [3]福建工程学院材料科学与工程系,福州350108

出　　处：《中国有色金属学报》2013年第10期2928-2935,共8页The Chinese Journal of Nonferrous Metals

基　　金：福建省科技厅重点项目(2010H0002);福州大学科技发展基金资助项目(600117);福建省科技计划项目(2010H0002)

摘　　要：采用SEM、EDS和DSC等方法研究稀土氧化物对采用氟盐法制备Al-Ti-C-RE的热力学影响。结果表明:Al与K2TiF6发生铝热放热反应生成TiA13及部分游离态[Ti],在铝热反应的作用下,稀土氧化物Ce2O3与C发生碳热反应,生成大量的CeC2,该相与游离态[Ti]易反应生成TiC和原子态[Ce],反应生成的[Ce]为表面活性元素,吸附在TiA13相上形成Al2Ti20Ce。DSC分析结果表明,添加稀土氧化物Ce2O3可在1 120℃左右自发产生碳热反应。因此,在铝热反应的基础上,利用稀土氧化物与石墨粉之间的碳热反应,不仅可以降低制备Al-Ti-C-RE细化剂的反应温度,同时还可提高C与铝熔体的润湿性,促进TiC粒子的生成。The effects of the rare earth oxide on the thermodynamics of A1-Ti-C-RE master alloy prepared by mixing the potassium titanium fluoride and carbon into aluminum melt were studied by means of SEM, EDS and DSC. The results show that the aluminothermy reaction of the A1 melt and KaTiF6 occurs to produce the TiA13 and [Ti] atoms. Then, based on the aluminothermy reaction, the rare earth oxide Ce203 reacts with carbon to produce the carbothermy reaction and abundant CeC2 phases form, which react with [Ti] atoms easily to produce the TiC particles and [Ce] atoms. The reacted ICe] atom is a kind of surface active elements, and easily adsorbs on the TiA13 phases to form the new rare earth compounds A12Ti20Ce. The DSC analysis results show that the rare earth oxide Ce203 has spontaneous carbo-thermal reaction at 1 120 ℃, which decreases the reacting temperature to manufacture A1-Ti-C-RE master alloys, improves the wettability between carbon and aluminum melts and promotes the formation of TiC particles.

关 键 词：Al-Ti-C-RE 稀土氧化物Ce2O3 热力学分析 

分 类 号：TG146.2[一般工业技术—材料科学与工程]