|About this Abstract
||Materials Science & Technology 2019
||Alumina at the Forefront of Technology III
||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
||Sarah Whipkey, William Carty
|On-Site Speaker (Planned)
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.
||Definite: At-meeting proceedings