Research on the low-temperature synthesis of cobalt aluminum spinel type blue pigments

In this paper, CuxCo1-xAl2O4 (x = 0.1-0.5) blue pigments have been successfully synthesized by combustion method at a low temperature (700 degrees C). Replacing Cu2+ for Co2+ in CoAl2O4 pigment enhanced the violence of the combustion reaction and the spinel-type precursor can be directly obtained. Therefore, it is conducive to synthesis of CoAl2O4 pigment at a low temperature. The intensity of blue hue of CuxCo1-xAl2O4 (x = 0.1-0.5) pigments decreases with increase of the Cu/Co ratio, and it increases with increase of the calcination temperature. When the x is the optimal value of 0.1, the CuxCo1-xAl2O4 pigment prepared at 700 degrees C exhibited excellent color performance similar to the previously reported CoAl2O4 pigment, which the chromatic value is L* = 39.51, a* = -16.67, b* = -21.58, C* = 27.27. After applying the pigments in transparent glaze and ceramic ink, the pigments exhibit high tinting strength and stability, indicating its potential application in ceramic decoration and ceramic ink-jet printing technology. This work provides a facile strategy of synthesis spinel-type powder at a low temperature. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This paper successfully synthesized CuxCo1-xAl2O4 blue pigments, suitable for ceramic decoration and ceramic ink-jet printing technology. The intensity of blue hue of the pigments decreases with increase of the Cu/Co ratio, while it increases with increase of the calcination temperature.