Enhanced compressive strength of porous alumina realized by synergy between La-doping and two-step sintering
- Authors
- Kim, Sung-Hyun; Woo, Jong-Won; Hong, Sang-Min; Kim, Jong-Won; Moon, Kyoung-Seok; Yang, Dong-Yeol; Jeon, Sang-Chae
- Issue Date
- May-2024
- Publisher
- American Ceramic Society
- Keywords
- alumina; densification; freeze-casting; grain growth; porous materials
- Citation
- Journal of the American Ceramic Society, v.107, no.5, pp 2849 - 2860
- Pages
- 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of the American Ceramic Society
- Volume
- 107
- Number
- 5
- Start Page
- 2849
- End Page
- 2860
- URI
- https://scholarworks.gnu.ac.kr/handle/sw.gnu/69357
- DOI
- 10.1111/jace.19647
- ISSN
- 0002-7820
1551-2916
- Abstract
- Sintering phenomena, densification, and grain growth are crucial for proper control of the microstructure for good mechanical strength. Here, materials and processing parameters, the addition of La2O3, and two-step sintering (TSS) were combined to lead to higher strength in the porous alumina prepared by freeze-casting. Based on grain growth and densification behaviors with the La2O3 doping, a beneficial thermal profile was designed for the TSS. As a result, higher relative density levels and smaller grain size were obtained compared with the results with conventional sintering (CS): 38.56% and 0.82 µm at 1500°C by CS; 40.78% and 1.78 µm at 1600°C by CS; 41.43% and 0.87 µm by TSS. The microstructural benefits provided ∼1.4 times higher compressive strength (5.46 MPa) from TSS than from the CS sample (3.92 MPa), highlighting the synergetic effect of La2O3 doping and the TSS strategy. © 2024 The American Ceramic Society.
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