(1. 福州大學(xué) 機(jī)械工程及自動(dòng)化學(xué)院，福州 350108；
2. 福州大學(xué) 材料科學(xué)與工程學(xué)院，福州350108；
3. 福建工程學(xué)院 材料科學(xué)與工程系，福州 350108)
摘 要: 采用SEM、EDS和DSC等方法研究稀土氧化物對(duì)采用氟鹽法制備Al-Ti-C-RE的熱力學(xué)影響。結(jié)果表明：Al與K2TiF6發(fā)生鋁熱放熱反應(yīng)生成TiA13及部分游離態(tài)[Ti]，在鋁熱反應(yīng)的作用下，稀土氧化物Ce2O3與C發(fā)生碳熱反應(yīng)，生成大量的CeC2，該相與游離態(tài)[Ti]易反應(yīng)生成TiC和原子態(tài)[Ce]，反應(yīng)生成的[Ce]為表面活性元素，吸附在TiA13相上形成Al2Ti20Ce。DSC分析結(jié)果表明，添加稀土氧化物Ce2O3可在1 120 ℃左右自發(fā)產(chǎn)生碳熱反應(yīng)。因此，在鋁熱反應(yīng)的基礎(chǔ)上，利用稀土氧化物與石墨粉之間的碳熱反應(yīng)，不僅可以降低制備Al-Ti-C-RE細(xì)化劑的反應(yīng)溫度，同時(shí)還可提高C與鋁熔體的潤(rùn)濕性，促進(jìn)TiC粒子的生成。
關(guān)鍵字: Al-Ti-C-RE；稀土氧化物Ce2O3；熱力學(xué)分析
（1. College of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China;
2. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;
3. Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350108, China）
Abstract:The effects of the rare earth oxide on the thermodynamics of Al-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 Al melt and K2TiF6 occurs to produce the TiA13 and [Ti] atoms. Then, based on the aluminothermy reaction, the rare earth oxide Ce2O3 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 [Ce] atom is a kind of surface active elements, and easily adsorbs on the TiA13 phases to form the new rare earth compounds Al2Ti20Ce. The DSC analysis results show that the rare earth oxide Ce2O3 has spontaneous carbo-thermal reaction at 1 120 ℃, which decreases the reacting temperature to manufacture Al-Ti-C-RE master alloys, improves the wettability between carbon and aluminum melts and promotes the formation of TiC particles.
Key words: Al-Ti-C-RE; rare earth oxide Ce2O3; thermodynamic analysis
