Lead-free 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3 powder surface treated against hydrolysis - a key for a successful aqueous processing
authors Kaushal, A; Olhero, SM; Ferreira, JMF
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY C
keywords PARTICLE PACKING; SUSPENSIONS; CERAMICS; AGGREGATION; NETWORKS; RHEOLOGY
abstract The properties of functional ceramics and their performance in industrial applications are strongly affected by the processing treatments. We report on long term stability of aqueous 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3 (BZT-BCT) suspensions. The effects of aging time on pH and on the leaching extents of Ba, Zr and Ca elements were systematically investigated for the naked, and the surface treated particles against hydrolysis. Suspensions with solid loadings (Phi) up to 60 vol%, pseudoplastic flow behaviours and long term colloidal stability could be achieved from the surface treated powder. A fractal dimension (D) of similar to 1.97 to 1.98 was estimated for the BZT-BCT suspensions from the yield stress (tau(y)) versus (Phi) dependence, suggesting a reaction limited cluster aggregation (RLCA) type of particle aggregation with a substantial rearrangement occurring in the aggregates under shearing. The maximum solid loading (Phi(m)) approximate to 61 vol% was determined. The concentrated and stable suspensions represent a stride for successful processing of functional BZT-BCT ceramic components via various aqueous colloidal shaping methods (slip casting, gel-casting, etc.) for large scale industrial applications.
publisher ROYAL SOC CHEMISTRY
issn 2050-7526
year published 2013
volume 1
issue 32
beginning page 4846
ending page 4853
digital object identifier (doi) 10.1039/c3tc30741g
web of science category Materials Science, Multidisciplinary; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000322254100006
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journal impact factor 7.059
5 year journal impact factor 6.404
category normalized journal impact factor percentile 85.94
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