(1. 昆明理工大學(xué) 理學(xué)院，昆明 650500；
2. 昆明理工大學(xué) 冶金與能源工程學(xué)院 真空冶金國家工程實驗室，昆明650093)
摘 要: 固態(tài)氧化鋁碳熱還原反應(yīng)在陶瓷材料及鋁冶金領(lǐng)域得到廣泛的應(yīng)用和研究，但其反應(yīng)機(jī)理至今未能得到統(tǒng)一的認(rèn)識。介紹氧化鋁碳熱還原過程形成的固態(tài)、氣態(tài)產(chǎn)物，闡述3種主要反應(yīng)機(jī)理。提出固-固相反應(yīng)機(jī)理缺乏直接證據(jù)，氣-固相反應(yīng)機(jī)理與熱力學(xué)分析及實驗不符，而氧化鋁分解反應(yīng)機(jī)理較合理。可能的反應(yīng)機(jī)理如下：氧化鋁分解為含鋁氣體和氧氣，碳與氧氣反應(yīng)以降低氧分壓，含鋁氣體再次反應(yīng)形成最終產(chǎn)物，在減壓或氬氣下形成碳化鋁、碳氧化鋁等，在氮?dú)庀滦纬傻X。并提出了系統(tǒng)解釋固態(tài)氧化鋁碳熱還原反應(yīng)需要繼續(xù)研究的方向。
關(guān)鍵字: 固態(tài)氧化鋁；碳熱還原；反應(yīng)機(jī)理
（1. Faculty of Science, Kunming University of Science and Technology, Kunming 650500, China;
2. National Engineering Laboratory of Vacuum Metallurgy, Faculty of Metallurgy and Energy Engineering,<）
Abstract:The carbothermal reduction of solid alumina is used and studied extensively in ceramic material and aluminum smelting; however, there still exist different viewpoints on its mechanism. The solid and gaseous products of the carbothermal reduction of alumina are introduced and the three main mechanisms are presented in this work. It is suggested that the alumina decomposition mechanism is reasonable, whilst the solid-solid reaction mechanism lacks for direct evidences, and the gas-solid reaction mechanism disagrees with the thermodynamic analysis and the experimental results. The possible mechanism is proposed as follows: alumina decomposes to Al-containing gases and oxygen, then carbon reacts with oxygen to reduce oxygen partial pressure, and the Al-containing gases react further to form the final products being aluminum carbide, aluminum oxycarbide and etc at reduced pressures or in argon, and being aluminum nitride in nitrogen. Furthermore, some future research directions are recommended for the systematic interpretation on the mechanism of the carbothermal reduction of solid alumina.
Key words: solid alumina; carbothermal reduction; reaction mechanism
