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Fabrication of Gradient Pore TiO 2 Sheets by a Novel Freeze–Tape‐Casting Process
Author(s) -
Ren Linlin,
Zeng YuPing,
Jiang Dongliang
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01833.x
Subject(s) - slurry , microstructure , materials science , tape casting , porosity , composite material , foil method , fabrication , ceramic , green body , casting , substrate (aquarium) , medicine , alternative medicine , pathology , oceanography , geology
Gradient pore structure TiO 2 sheets were fabricated by a novel freeze–tape‐casting process. Aqueous TiO 2 ceramic slurries were prepared by the traditional tape‐casting processing and were then cast onto an aluminum foil carrier. The slurries were immediately frozen on the substrate, whose temperature was about −18°C. After freezing completely, the green sheets were then dried in a lyophilizer. Freeze–tape casting led to formation of a gradient pore microstructure of the TiO 2 sheet. The results showed that the solid loading of slurry considerably affected the pore microstructure, pore morphology, and the porosity. Solid loadings of 10, 20, 30, 40, and 50 wt% slurries were used, respectively, and the gradient pore structure TiO 2 sheets with different porosities of 75%–88% were obtained.