Molten-salt assisted synthesis and characterization of ZrSiO4 coated carbon core-shell structure pigment

A core-shell structure zirconium silicate encapsulated carbon (C@ZrSiO 4 ) pigment was synthesized by a molten-salt assisted method. The experimental results indicated that the Na 2 WO 4 molten-salt associated with the synthesis of ZrSiO 4 at low temperature and controlled the morphology of the encapsulation pigment simultaneously. The encapsulated pigment prepared with the assistance of Na 2 WO 4 molten-salt showed regular microcubes about 3.0 μm, while the pigment in the absence of molten-salt have serious aggregation with a particle size of 12.78 μm. Moreover, the maximum addition amount of carbon black was increased significantly from 15 wt% to 40 wt% after adding molten-salt, while the chromatic value L * of C@ZrSiO 4 pigment decreased from 68.21 to 33.08 accordingly. The pigment exhibited excellent thermal stability at high temperature, making it a promising candidate for ceramic decoration.