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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Advanced Real Time Optical Imaging
Presentation Title In-situ Microscopic Study of Natural Hematite over Repeated Reduction-oxidation Gas Exposures
Author(s) Anna Nakano, Jinichiro Nakano, James Bennett
On-Site Speaker (Planned) Anna Nakano
Abstract Scope 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.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Agglomeration Behavior of Non-metallic Inclusions in Liquid High Carbon Steel
Agglomeration of Non-metallic Inclusions at the Liquid Steel/Ar Gas Interface: A Summary of In-situ Observation Experiments and a Theoretical Study
Current State Art of Double Hot Thermocouple Technology—Novel Way for the Study of Mold Flux High-temperature Properties
Determining Metastable Phase Transformation Temperature between Al4Sm-beta and Al4Sm-gamma
Direct Observation of Iron Solidification under Molten Slag
High-temperature Microscopy Incorporating Differential Thermal Analysis
In-situ Microscopic Study of Natural Hematite over Repeated Reduction-oxidation Gas Exposures
In-situ Observation of Reduction or Oxidation of Molten CaO-FeOx-SiO2 Oxides at 1573 K
In-situ Observation of Sulfide Formation during Solidification in Fe-Cr-Ni-Mn-S Alloys
In-situ Studies of Selective Oxidation in Advanced High Strength Steels
In Situ Observation of Dissolution of Oxide Inclusions in Steelmaking Slags
Insitu Tensile Performance of P91 Steel in CO2 Environment, Utilizing Small Samples and a Confocal Microscope
Introduction to Advanced Real Time Optical Imaging
Investigation of Integrated Recycling Waste Heat and Slag Resources Using Single Hot Thermocouple Technique
Localized Concentration of Metal Cations of Steelmaking Slags and its Visualization Using Confocal Laser Scanning Microscope
Mass Transfer in High-temperature Laser Confocal Microscopy
Observations of Ferrite Formation and Growth in Inclusion-engineered Low Alloy Steels during In-situ Heat Treatments
Real-time Observation of Solution Growth Interface of SiC Using Alloy Solvent
Real Time Observation of High Temperature Metallurgical Phenomenon at the University of Leuven
Thermal Imaging Furnace for the Investigation of the Molten State
Using High-temperature Confocal Scanning Laser Microscopy to Study Transient Phenomena: Swelling and Spontaneous Emulsification
Wettability of Graphite-alumina Composites against Molten CaO-SiO2-Al2O3-MgO Slags
Wetting, Spreading and Penetrating Behavior of Slags in Contact with Refactory Ceramics

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