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J. Korean Ceram. Soc. > Volume 60(6); 2023 > Article
Journal of the Korean Ceramic Society 2023;60(6): 935-949.
doi: https://doi.org/10.1007/s43207-023-00317-1
Surface passivation of α-Al2O3 powder using water vapor to achieve consistent slurry viscosity
Eun Chae You, Dang-Hyok Yoon
School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 38541, South Korea
Correspondence  Dang-Hyok Yoon ,Email: dhyoon@ynu.ac.kr
Received: April 20, 2023; Revised: June 8, 2023   Accepted: July 5, 2023.  Published online: July 18, 2023.
Based on the significant viscosity variations in the aqueous α-Al2O3 slurries depending on the powder pre-treatments and slurry retention, this study examined the surface chemistry of α-Al2O3 to determine the factors affecting viscosity. An aqueous slurry prepared with the α-Al2O3 powder exposed to air revealed a much higher viscosity than those prepared with heat treatment or exposure to moisture; the opposite trend was observed for a non-aqueous slurry. Surface analysis using Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy combined with viscosity measurements showed that the viscosity depended strongly on the amount of hydroxyl ions and carbonates adsorbed on the powder surface. Through surface passivation using water vapor at 750 °C for α-Al2O3 powder, the viscosity of aqueous slurry decreased significantly with less variation, owing to the increased amount of firmly attached isolated hydroxyl ions on the α-Al2O3 surface.
Key words: Al2O3 · Viscosity · Hydroxyl ions · Carbonates · Surface chemistry
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