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Effect of Particle Size on the Blue Chromate Pigment CoAl₂O₄

Y. Wang, Q. Wang, Q. Chang, S. Hu, X. Wang, K. Yang

Journal of Ceramic Science and Technology, Vol. 9, No. 1 (2018), pp. 43-46

DOI: 10.4416/JCST2017-00060

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Abstract

A stable ceramic ink for inkjet printing requires ultrafine pigment powders. However, the decreased particle size of the ceramic pigment has an uncertain effect on the chromate. To understand this effect, a series of CoAl2O4 powders with different particle sizes was prepared with the nitrate-glycine combustion method followed by bead milling. The results show that the average particle size (d50) of the CoAl2O4 powder decreases from 6.4 μm to 0.33 μm after milling for 10 h. The particle size has a clearly negative effect on the color of CoAl2O4 pigment. The chromate value changes from L* = 49.82, a* = 0.05, b* = -50.90 to L* = 56.42, a* = -13.15, b* = -28.02. Accordingly, the CoAl2O4 pigment changes from dark blue into sky blue. However, this rule is weak for CoAl2O4 pigment used in transparent glaze. The chromate of glaze changes only from L* = 29.65, a*= 25.07, b* = -52.12 to L* = 20.61, a* = 22.28, b* = -41.35. The glaze changes from dense blue into bright blue.

Keywords

Inkjet printing, pigment, CoAl2O4, particle size, chromate

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