Spontaneous adsorption effect of graphitic carbon nitride nanosheets to improve sintering behavior of yttria-stabilized zirconia microbeads
- Authors
- Won Kim, Dong; Kim, Eun-Jeong; Lee, Chul-Lee; Moon, Kyoung-Seok
- Issue Date
- May-2024
- Publisher
- Elsevier BV
- Keywords
- Ceramic microbead; g-C<sub>3</sub>N<sub>4</sub> nanosheet; Spontaneous adsorption; Yttria-stabilized zirconia
- Citation
- Applied Surface Science, v.654
- Indexed
- SCIE
SCOPUS
- Journal Title
- Applied Surface Science
- Volume
- 654
- URI
- https://scholarworks.gnu.ac.kr/handle/sw.gnu/69691
- DOI
- 10.1016/j.apsusc.2024.159447
- ISSN
- 0169-4332
1873-5584
- Abstract
- Yttria-stabilized zirconia (YSZ) is a ceramic material in which the zirconium dioxide structure is stabilized at room temperature by adding yttrium oxide. However, the YSZ formed by the thick film process on a pre-sintered dense substrate suffers from sintering problems such as different sintering shrinkage rates due to phase transitions and thermal conductivity. This in turn can lead to de-bonding, cracking, delamination, and abnormal growth. We prepared a spherical YSZ green body of approximately 38 μm diameter formed by an organic binder based on a sintered YSZ seed with 15 to 20 μm diameter. In addition, the application of two-dimensional g-C3N4 nanosheets that can be adsorbed on the surface and pores of the green body before the sintering process was evaluated. The YSZ green body with adsorbed surface-modified g-C3N4 nanosheets could be synthesized by stable spontaneous adsorption due to zeta-potential attraction onto the surface of zirconia particles in an aqueous solution. Consequentially, the formation of large grains due to abnormal grain growth was reduced as g-C3N4 was adsorbed. The spontaneous adsorption of nanosheets controls the surface diffusion mechanism by sequentially lowering the energy from a high surface energy in the initial stage of sintering. Uniform grain growth thus can be induced according to the activation energy level of the controlled surface diffusion. © 2024 Elsevier B.V.
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