|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials 2021
||Effect of SiO2 Sources Addition on the Microstructure and Thermal Shock Performance of Alumina–spinel Castables
||Yang Liu, Min Chen, Shan Wang, Xianglan Yang
|On-Site Speaker (Planned)
Considering the thermal shock resistance of ladle lining castable strongly dependent to the phase composition and microstructure, the influence of SiO2 sources on the thermal shock resistance of alumina–spinel castables was studied by analyzing the microstructural evolution. The results indicate that trace addition of SiO2 was detrimental to the high temperature mechanical properties of the samples, due to the low-melting phase of gehlenite formed at high temperature. However, the formation of gehlenite was potential to improve thermal shock resistance attribute to the loose microstructure stacked by equiaxial plate-like CA6 which owing to its promotion of ion mobility. Meanwhile, it was also confirmed by the samples with the well crystalized fused silica because of the maximum retained moduli values and relatively slight influence on high temperature mechanical properties in contrast with other SiO2 sources addition.
Keywords: SiO2 sources; Microstructural evolution; Mechanical properties; Alumina–spinel castables