Production of Yttria Ceramics by Gelcasting

The production of yttria ceramics by green-gelcasting technique was developed through： （1） optimization of aqueous yttria slurries; （2） optimization of the gelcasting process; （3） thermal treatments and characterization of the final microstructures. Different dispersants were tested. Zeta potential...

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Bibliographic Details
Published in:Journal of materials science and engineering. B 2011-11, Vol.1 (5), p.641-648
Main Authors: Sangiorgi, A, Costa, AL, Pinasco, P, Sanson, A, Ballarin, B
Format: Article
Language:chi ; eng
Subjects:
Ceramics
Density
Dispersants
Gelation
Microstructure
Scanning electron microscopy
Sintering
Yttrium oxide
凝胶注模成型工艺
动态光散射
扫描电子显微镜
氧化钇陶瓷
注凝成型
流变测量
真空条件
陶瓷生产
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Summary:The production of yttria ceramics by green-gelcasting technique was developed through： （1） optimization of aqueous yttria slurries; （2） optimization of the gelcasting process; （3） thermal treatments and characterization of the final microstructures. Different dispersants were tested. Zeta potential characterization of the dispersed state was performed. Dynamic light scattering （DLS） measurements on the suspensions showed a strong aging effect ofpolyacrylate dispersants. Rheological measurements identified the exact Tg temperatures of the gelling agent. The yttria suspensions were ball milled with the dispersant for 24 h and heated at 65 ℃, while the gelling agent as added to the ceramic suspension after solubilization in a separate solvent at 90 ℃. The resulting mixture was de-aired under vacuum and casted into PE or silicon moulds. The casted bodies were dewatered, debonded at 500 ℃ and sintered in air or under vacuum at 1,660-1,700 ℃. The microstructure of the sintered bodies with final relative density between 90%-95% was analyzed by scanning electron microscope （SEM）.
ISSN:2161-6221