Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 33, Issue 10, Pages 2023-2029Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.02.011
Keywords
SiC coating; Carbon black; Molten salt synthesis; Water-wettability; Carbon-containing castable
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Funding
- UK Engineering and Physical Sciences Research Council (EPSRC)
- Centre for Advanced Structural Ceramics (CASC) at Imperial College London
- University of Sheffield
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Silicon carbide (SiC) coatings were prepared on carbon black (CB) particles after 6 h at 1100 degrees C by a molten salt synthesis (MSS) technique. By controlling the Si to CB ratio (Si/C) in the initial batch mixture, the SiC coating thickness could be readily tailored to meet practical requirements in real castable systems. True densities of CB particles after SiC coating increased with Si/C. The zeta potential values indicated that their dispersivity was improved evidently over a wide range of pH. At a given shear rate, the apparent viscosity of a water suspension containing SiC-coated CB was significantly lower than that of a water suspension containing as-received uncoated CB, indicating the improved fiowability of SiC-coated CB in water. The improvements in both the water-dispersivity and fiowability of SiC coated CB particles would make them a promising candidate carbon material for future castable applications. (C) 2013 Elsevier Ltd. All rights reserved.
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