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以氧化铝(Al2O3)和石墨(C)为原料,采用碳热还原工艺合成铝氧碳(Al4O4C),借助于X射线衍射仪和场发射扫描电子显微镜研究了加热温度和保温时间对合成铝氧碳(Al4O4C)的影响。结果表明:提高加热温度,可加快Al2O3和C反应生成Al4O4C的反应速率;延长保温时间可增大Al2O3和C反应生成Al4O4C的反应程度。在反应初期主要为固-固反应,Al2O3和C直接接触反应生成Al4O4C和一氧化碳(CO);后期主要为气-固反应,Al2O3和CO气体反应生成Al4O4C和二氧化碳(CO2)。计算得到气-固反应的频率因子和活化能分别为338.66和264.19kJ/mol。
Alumina (Al4O4C) was synthesized by the carbothermal reduction process using alumina (Al2O3) and graphite (C) as raw materials. The effect of heating temperature and holding time on the mechanical properties of synthetic aluminum oxide Carbon (Al4O4C) effects. The results show that increasing the heating temperature can accelerate the reaction rate of Al2O3 and C to Al4O4C. Extending the holding time can increase the reaction of Al2O3 and C to produce Al4O4C. In the initial reaction stage, the main reaction is solid-solid reaction, and Al2O3 and C are in direct contact with each other to form Al4O4C and carbon monoxide (CO). The latter stage is mainly gas-solid reaction and Al2O3 and CO gas react to form Al4O4C and carbon dioxide (CO2). The calculated gas-solid reaction frequency and activation energy were 338.66 and 264.19 kJ / mol, respectively.