FU Wei ¹, YUAN Zhi ², CHEN Kaiyuan ¹, LIU Laijun ¹
(1. College of Material Science and Engineering, Guilin University of Technology, Guilin 541000, Guangxi, China; 2. Collage of Energy and Building Environment, Guilin University of Aerospace Technology, Guilin 541000, Guangxi, China)

Abstract: Spinel CoAl₂O₄ blue colorant is one of the most widely used pigments in blue ceramic ink. Using Al₂O₃ and CoO, the pigment material CoAl₂O₄ is prepared by solid phase method, then analyzed by XRD, SEM, UV-Visible spectrophotometer, etc., to study the effects of different mass ratios of raw materials, holding time and calcination temperature on the degree of crystallization and coloration of CoAl₂O₄ to obtain the optimum process parameters for reducing production cost and saving energy. The results show that the optimum conditions for the preparation of cobalt blue material with good color are as follows: m(CoO) : m(Al₂O₃)=0.540, the calcination temperature is 1200 °C, and the holding time is 2 h. At the same time, the colorant has good visible light response and fluorescence effect.

Key words: CoAl₂O₄; high temperature solid phase method; spinel; fluorescence effect