|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||F-73: Study on the High Temperature Phase Equilibrium Relationship in CaO-SiO2-10%La2O3-Nb2O5 System
||Jiyu Qiu, Chengjun Liu, Zhaoyun Wang, Junjie Shi, Lifeng Sun
|On-Site Speaker (Planned)
Phase diagram is widely used as the most intuitive thermodynamic tool, the partition of independent region is the decisive factor to determine equilibrium relationship for sub-solid phases. The comprehensive utilization of REE-Nb-Fe deposits is severly restricted due to the lack of thermodynamic research on the phase equilibrium relationships. In this paper, the independent regions within the specific composition range of CaO-SiO2-La2O3-Nb2O5 system were distinguished and the phase equilibrium relationship for 10%La2O3 section was determined using the slow cooling experiment and high temperature equilibrium experiment. It was found the independent triangle region contain SiO2, CaO·Nb2O5 and CaO·SiO2 in CaO-SiO2-Nb2O5 ternary phase diagram changed as an independent tetrahedral region which contain SiO2, CaO·Nb2O5, CaO·SiO2 and CaO-Nb2O5-La2O3 ternary compounds with the addition of 10% La2O3. Meanwhile, the low melting temperature region became larger and the eutectic line and eutectic point moved toward higher SiO2 composition after La2O3 addition.
||Planned: Supplemental Proceedings volume