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Meeting Materials Science & Technology 2019
Symposium Alumina at the Forefront of Technology III
Presentation Title Investigating the Grain Growth Kinetics of Al<sub>2</sub>O<sub>3</sub> During Liquid Phase Sintering in the CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> System
Author(s) Sarah Whipkey, William Carty
On-Site Speaker (Planned) Sarah Whipkey
Abstract Scope Industrial Al<sub>2</sub>O<sub>3</sub> typically contains 5-14 wt% liquid phase. The extent to which this glass phase contributes to microstructure evolution is not well-described. This study investigates the grain growth behavior of Al<sub>2</sub>O<sub>3</sub> with liquid phase additives in the CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> system with SiO<sub>2</sub>:CaO molar ratios > 1. While average grain size was observed to change significantly with varying glass phase chemistry, the quantity of glass present was not observed to affect grain growth over the range of 4-12 wt% glass content. To evaluate the role of varying glass composition on grain growth, the point where exaggerated grain growth began was assumed to be at the same point of densification (>97% theoretical) across each system. From a normalized densification dependence, the grain growth rates were not observed to change significantly across the glass phase chemistries investigated, however, the onset of exaggerated grain growth was strongly dependent on glass phase chemistry.
Proceedings Inclusion? Definite: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advances in Additive Manufacturing of High Strength Alumina and Alumina-derived Ceramics
Alumina Ceramics at Elevated Temperatures
Corrosion Stability of Alumina in Water
From Micro to Macro: Crack Evolution in Alumina under Compressive Loading
Grain Boundary Complexion Engineering: Lessons Learned in Alumina
Investigating the Dependence of Microstructure Evolution during Liquid Phase Sintering on Grain Boundary Chemistry in Al2O3
Investigating the Grain Growth Kinetics of Al2O3 During Liquid Phase Sintering in the CaO-Al2O3-SiO2 System
Ribbon Ceramics

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