|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Real Time Optical Imaging
||In-situ Microscopic Study of Natural Hematite over Repeated Reduction-oxidation Gas Exposures
||Anna Nakano, Jinichiro Nakano, James Bennett
|On-Site Speaker (Planned)
In this work, the real-time behavior of natural hematite particles was investigated over repeated reduction-oxidation gas exposures at 800 °C and 1200 °C simulating chemical looping applications. Conventional microscopic imaging techniques to investigate surface changes at elevated temperatures typically require withdrawal and quenching of materials for subsequent analysis, which would induce unexpected physical and chemical modifications in materials, complicating interpretation of resulting microstructures. To minimize such artifact, the present work utilized a customized heat chamber attached to a commercial confocal scanning laser microscope with the capability of white light application. Natural hematite particles were isothermally exposed to redox gas cycles at designated temperatures to study real time alterations in surface morphology and physical properties. Surface lateral phase transformation kinetics, volume changes, materials degradation, and agglomeration behaviors during the redox gas cycles are discussed.
||Planned: Supplemental Proceedings volume