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首页> 外文期刊>ISIJ international >Phase Diagram Study of the CaO–CaF2 System
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Phase Diagram Study of the CaO–CaF2 System

机译：CaO–CaF 2 系统的相图研究

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Key phase diagram experiments for the CaO–CaF_(2) system were conducted using an equilibration and quenching technique and thermal analysis. Equilibration and quenching experiments using sealed Pt capsules followed by FE-SEM EDS compositional analysis and XRD phase analysis were performed to determine the CaO and CaF_(2) liquidii and the solubility of CaO in solid CaF_(2). Thermal analyses with DSC and TGA were used to determine the temperatures of the eutectic and the α - to β -CaF_(2) polymorphic transition. For the first time, noticeable solubility of CaO in α - and β -CaF_(2) solids is observed above 1000°C. The maximum solubility of CaO in solid CaF_(2) is about 5 mol% at the eutectic temperature (about 1361°C) while no solubility of CaF_(2) in solid CaO is detected. Based on the thermodynamic optimization using the present CaO and CaF_(2) liquidii and the eutectic temperature measurements, it is concluded that the CaO–CaF_(2) binary is a simple eutectic system with the eutectic reaction L_((CaO = 15 mol%)) → CaO_((pure solid)) + CaF_(2(solid solution with CaO = 5 mol%)) at 1361°C. The α - to β -CaF_(2) polymorphic transition is located at about 1146°C and the melting point of CaF_(2) at 1420°C.
机译：CaO–CaF_（2）系统的关键相图实验是使用平衡和淬火技术以及热分析进行的。使用密封的Pt胶囊进行平衡和淬灭实验，然后进行FE-SEM EDS组成分析和XRD相分析，以确定CaO和CaF_（2）液相以及CaO在固体CaF_（2）中的溶解度。使用DSC和TGA进行热分析，以确定共晶温度和从α-到β-CaF_（2）多晶型转变。首次在1000°C以上观察到CaO在α-和β-CaF_（2）固体中的明显溶解度。在共晶温度（约1361℃）下，CaO在固体CaF_（2）中的最大溶解度约为5mol％，而未检测到CaF_（2）在固体CaO中的溶解度。基于目前的CaO和CaF_（2）液体的热力学优化和共晶温度测量结果，得出的结论是CaO–CaF_（2）二元体系是具有共晶反应L _（（CaO = 15 mol％ ））→CaO _（（纯固体））+ CaF_（2（CaO = 5 mol％的固溶体））。 α-至β-CaF_（2）多晶型转变位于约1146℃，CaF_（2）的熔点在1420℃。

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