Slip casting of highly concentrated ZnO suspensions: Rheological studies, two-step sintering and resistivity measurements

Piotr Wieciński , Anna Więcław-Midor

Abstract

The paper presents research on elaboration of well dispersed and stable aqueous suspensions of ZnO fine powder. Within the work the influence of the type and concentration (0.2 wt% - 1.2 wt%) of selected dispersing agents (i.a. poly(acrylic acid)-based polyelectrolyte and tetramethylammonium hydroxide), solid loading (30 - 50 vol%) and milling time (1–3 h) on the rheological properties of the slurries was investigated. Two-step sintering (970/920 °C, 2 h) was applied to sinter the green bodies obtained by slip casting. The lowest viscosity of ZnO suspensions was obtained for the addition of 0.4 wt% of poly(acrylic acid)-based polyelectrolyte (PAA) and TMAH. ZnO suspension containing PAA had negative zeta potential in the whole pH range. The highest solid loading obtained in the study was 50 vol%. The applied two-step sintering allowed to obtain samples of high density (above 96% of TD) and homogeneous microstructure of average grain size of 640 nm. ZnO sintered bodies were characterized by different electric properties at the core part and outer part of the sample which was caused by the differences in concentration of oxygen vacancies.

Author Piotr Wieciński (FC / CChT)
Piotr Wieciński,,
- Chair of Chemical Technology
, Anna Więcław-Midor (FC / CChT)
Anna Więcław-Midor,,
- Chair of Chemical Technology
Journal seriesCeramics International, ISSN 0272-8842, e-ISSN 1873-3956
Issue year2020
Vol46
No12
Pages19896-19903
Publication size in sheets0.5
Keywords in EnglishZnO, Slip casting, Rheology, TMAH, Two-step sintering
ASJC Classification1508 Process Chemistry and Technology; 2503 Ceramics and Composites; 2504 Electronic, Optical and Magnetic Materials; 2505 Materials Chemistry; 2508 Surfaces, Coatings and Films
DOIDOI:10.1016/j.ceramint.2020.05.051
URL https://www.sciencedirect.com/science/article/pii/S0272884220313389
Languageen angielski
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 22-07-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.279; WoS Impact Factor: 2018 = 3.45 (2) - 2018=3.187 (5)
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