Fabrication of stable Al2O3 slurries and dense green bodies using soft-energy milling process

• Published in: Journal of the European Ceramic Society Vol. 29; no. 5; pp. 869 - 874
• Main Authors: Hotta, Y., Tsunekawa, K., Shirai, T., Sato, K., Yasuoka, M., Watari, K.
• Format: Journal Article
• Language: English
• Published: 01.03.2009
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2008.07.013

Wet-jet milling and planetary homogenising processes as soft-energy milling methods were employed to prepare stable Al2O3 slurries. The viscosity of the slurries prepared from the soft-energy milling was constant and had long term stability when compared to ball-milled slurries. The Al2O3 particles surfaces yielded more hydroxyl groups after ball milling, but the Al2O3 particles surfaces after the soft-energy milling were similar to the raw particles. Relative density of the green bodies prepared from the wet-milled slurries was about 67% and was independent of the slurry solids content. However, the relative density of the green bodies prepared from the ball-milled slurries increased with increasing solids content. Linear shrinkage of the sintered bodies prepared from the soft-energy milled slurries was independent of the slurry solids content, whereas that of the sintered bodies prepared from the ball-milled slurries increased with decreasing solids content.