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Agar‐Based Aqueous Gel Casting of Barium Titanate Ceramics
Author(s) -
Munro Cameron D.,
Plucknett Kevin P.
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02466.x
Subject(s) - materials science , casting , barium titanate , ceramic , aqueous solution , agar , suspension (topology) , particle size , aqueous suspension , tape casting , chemical engineering , composite material , metallurgy , chemistry , mathematics , homotopy , biology , bacteria , pure mathematics , engineering , genetics
Agar was used for gel casting barium titanate (BaTiO 3 ) ceramics. Aqueous suspensions of bimodal BaTiO 3 powders, with 500 and 100 nm nominal particle sizes, were prepared with a 85:15 coarse:fine ratio. BaTiO 3 suspensions were mixed with agar solutions from 2 to 8 wt%, with 0.5 or 1.0 wt% agar (as a function of BaTiO 3 solids content) in the final gel‐casting suspension. BaTiO 3 green densities up to ∼53.2% of theoretical were obtained. Gel casting of high aspect ratio features (up to 7:1) could be routinely performed. Cast bodies were also amenable to computer‐numerical‐controlled based green machining.