中等氧分压下CaO-SiO_2-Al_2O_3-FeO_x体系的液相线及平衡相关系

Liquidus and Phase Equilibria in CaO-SiO_2-Al_2O_3-FeO_x System at Intermediate Oxygen Partial Pressure

采用高温平衡实验方法研究了10.13 Pa氧分压下,温度对CaO-Al2O3-FeOx及SiO2-Al2O3-FeOx两三元系液相线及平衡相关系的影响.平衡试样的EPMA(电子探针显微分析)、SEM(扫描电镜)检测结果表明,对CaO-Al2O3-FeOx体系而言,随着温度由1 450℃升至1 550℃,液相区向高Al2O3区域扩展,且两个温度条件下其高Al2O3区域的平衡相关系均包括两相平衡共存以及三相平衡共存.另一方面,对于SiO2-Al2O3-FeOx体系,其液相区随温度升高向高铁区及莫来石初晶区扩展,同时该体系1 450℃下靠近SiO2-FeOx侧的平衡相关系与1 550℃下不同.此外,实验测定的液相线与基于FactSage的计算值表现出较好的一致性.

A high temperature equilibrium experiment was carried out to investigate the effects of temperature on the liquidus lines and equilibrium phase relations of the CaO-Al2O3-FeOx and the SiO2-Al2O3-FeOx ternaries at intermediate oxygen partial pressure of 10.13 Pa.The results of electron probe microanalysis（EPMA） and scanning electron microscope（SEM） showed that the liquidus region of CaO-Al2O3-FeOx system extended to the high Al2O3 region with the temperature increasing from 1 450 to 1 550 ℃,and the equilibrated coexisting phases with two-phase and three-phase coexistence were found in the high Al2O3-containing region for the two temperatures.While for the SiO2-Al2O3-FeOx system,the liquidus area expanded to the high iron oxide as well as to the primary region of mullite with the temperature increasing,and the equilibrium phase relations at 1 450 ℃ were different from those at 1 550 ℃.In addition,the present experimental results agree well with the FactSage predictions.