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

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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.

keywords

PARTICLE PACKING; SUSPENSIONS; CERAMICS; AGGREGATION; NETWORKS; RHEOLOGY

subject category

Materials Science; Physics

authors

Kaushal, A; Olhero, SM; Ferreira, JMF

our authors

foto Ajay Kaushal

Ajay Kaushal

Post-Doc Fellowship
foto José Maria da Fonte Ferreira

José Maria da Fonte Ferreira

Retired Professor
foto Susana Maria Henriques Olhero

Susana Maria Henriques Olhero

Assistant Professor

Groups

G5 - Biomimetic, Biological and Living Materials

Projects

Development of microelectromechanical systems by gelcasting - GELMEMS (PTDC/CTM/099489/2008)

acknowledgements

The authors are thankful to the Foundation for Science and Technology of Portugal (FCT) for the financial support under the project PTDC/CTM/099489/2008, and the post-doc grants of S. M. Olhero SFRH/BPD/87486/2012 and A. Kaushal (SFRH/BPD/77598/2011). The support from CICECO, University of Aveiro, is also acknowledged.

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Publication Details

type
Journal Article
year
2013
journal
JOURNAL OF MATERIALS CHEMISTRY C
volume
1
publisher
ROYAL SOC CHEMISTRY
issn
2050-7526
issue
32
digital object identifier
10.1039/c3tc30741g
web of science article identifier
WOS:000322254100006

Journal Metrics (JCR 2019)

Journal Impact Factor
7.059
Journal Impact Factor (5 yrs)
6.404
category normalized journal percentile
85.94

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