Abstract
Cobalt blue pigments were prepared by self-propagating combustion followed by sol-gel method using aluminum nitrate and cobalt nitrate as the raw material. X ray diffraction (XRD), scanning electron microscopy (SEM), fiber optic spectrometer and colorimetric analysis were used to investigate the effect of reaction temperature, metal ion concentration and dispersant upon the gel formation. The results show that the formation of gel network could be promoted by increasing the concentration of metal ion (0.01~0.2 mol/L) and sol-gel reaction temperature (80~90°C), and the disper-sibility and stability of the pigment powder could be improved with dispersing agent. The dried gel precursor was calcined at 1250 °C to form 200~500 nm cobalt aluminum with spinel structure with highly negative value of b*.
Highlights
Inkjet printing technology has been rapidly developed for the ceramic tile decoration
The resulting powder was calcined at 900~1250 °C in a muffle furnace for 60 minutes, and the cobalt blue pigment was obtained after the thermal treatment
We studied the influence of the calcination temperature on the color performance of the pigments
Summary
Inkjet printing technology has been rapidly developed for the ceramic tile decoration. It allows flexible design and control of printing images, inks and substrates with higher surface coverage, and high number of reflectance points[1]. Chemlal et al prepared cobalt aluminate CoAl2O4 by utilizing sol-gel method, where HNO3, Al2O3 and CoCl2·6H2O were selected as raw materials, and discussed the influence of pH value upon the crystallization and surface properties of CoAl2O47. Cobalt blue pigment precursor was prepared by a sol-gel method using aluminum nitrate and cobalt nitrate as raw materials. It is shown that the sol-gel method produces CoAl2O4 powders that have better particle distribution and dispersity than the solid-state reaction method
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