WANG Yongqing ¹, YANG Wenjing ¹, MA Ji ², WANG Yang ¹, WANG Qikun ¹, WANG Chao ¹, CHANG Qibing ¹
(1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. Jingdezhen KITO Ceramics Co., Ltd., Jingdezhen 333400, Jiangxi, China)

Abstract: In response to the national policy of energy conservation and emissions reduction, to solve higher temperature synthesis of the CoAl₂O₄ pigment, the microemulsion-hydrothermal-coprecipitation (MHC) method was successfully used to synthesize CoAl₂O₄ pigment at 400 °C. The effect of calcination temperature on the properties of CoAl₂O₄ pigment was studied systematically. The experimental results show that cobalt aluminum spinel phase appeared in the pigment when the calcination temperature was 300 °C; the pure spinel phase was synthesized in the pigment when the calcination temperature was 400 °C; the chromatic values were L*=22.26, a*=2.03, b*=7.29, and the color was dark green. The chromatic values of the samples enameled with CoAl₂O₄ pigments (adding 6wt.%) synthesized at 400 °C were L*=21.21, a*=22.91, b*=41.27, and the color was dark blue. The as-prepared pigments show a strong coloring ability.

Key words: CoAl₂O₄ pigment; low temperature; microemulsion-hydrothermal-coprecipitation method