材料科学
烧结
微观结构
晶粒生长
多孔性
晶界
兴奋剂
复合材料
晶粒异常长大
化学工程
光电子学
工程类
作者
Jongwon Woo,Sunghyun Kim,S.I. Hong,Jong‐Won Kim,Kyoung‐Seok Moon,Dong‐Yeol Yang,Sang‐Chae Jeon
标识
DOI:10.1016/j.jmrt.2024.03.168
摘要
Mechanical stability of freeze-casted porous alumina can be achieved by the stimulation of densification with control of the grain growth during sintering. To tailor the porous microstructure beneficially, in this study TiO2 was added and its segregation effect on the densification and its grain growth behaviors were investigated. As a result, abnormal grain growth was observed with faceted interfaces and explained by grain boundary structure dependent grain growth theory. In terms of densification, a higher bulk density was obtained with the addition of 1.5 wt% TiO2 (41.76 %TD) compared to that without doping (36.02 %TD). The benefit was evident at 1400 °C, whereas the bulk density decreased even with an addition of TiO2 above 1500 °C. This temperature dependence could be understood by a change in the dominant densification mechanism at 1500 °C, solving the puzzle of the enhanced densification only at low temperature.
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