Low temperature enhancement of densification in freeze-casted porous alumina upon the addition of TiO2

Jong-Won Woo; Sung-Hyun Kim; Sang-Min Hong; Jong-Won Kim; Kyoung-Seok Moon; Dong-Yeol Yang; Sang-Chae Jeon

Journal of Materials Research and Technology (May 2024)

Low temperature enhancement of densification in freeze-casted porous alumina upon the addition of TiO2

Jong-Won Woo,
Sung-Hyun Kim,
Sang-Min Hong,
Jong-Won Kim,
Kyoung-Seok Moon,
Dong-Yeol Yang,
Sang-Chae Jeon

Affiliations

Jong-Won Woo: Department of Materials Convergence and System Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do, 51140, Republic of Korea
Sung-Hyun Kim: Department of Materials Convergence and System Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do, 51140, Republic of Korea
Sang-Min Hong: School of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do, 51140, Republic of Korea
Jong-Won Kim: School of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do, 51140, Republic of Korea
Kyoung-Seok Moon: School of Materials Science and Engineering, Gyeongsang National University, 501 Jinjudae-ro, Jinju, Gyeongnam-do, 52828, Republic of Korea; Department of Materials Engineering and Convergence Technology, Gyeongsang National University, 501 Jinjudae-ro, Jinju, Gyeongnam-do, 52828, Republic of Korea
Dong-Yeol Yang: Department of 3D Printing Materials, Korea Institute of Materials Science, 797 Changwondae-ro, Gyeongsangnam-do, 51508, Republic of Korea
Sang-Chae Jeon: Department of Materials Convergence and System Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do, 51140, Republic of Korea; School of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do, 51140, Republic of Korea; Corresponding author. Department of Materials Convergence and System Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do, 51140, Republic of Korea.

Journal volume & issue: Vol. 30
pp. 2589 – 2595

Abstract

Read online

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.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

About the journal

Abstract

Keywords