Preparation of Y-Ce_2S_3@ZrO_2 Red Pigment by Hydrolysis Combined Hydrothermal Two Steps Method

摘要

The core-shell red pigment ?-Ce_2S_3@ZrO_2 was prepared by a two steps method. ?-Ce_2S_3 was pre-coated at 30癈 with hydrolysis, followed by hydrothermal reaction at 180 癈 for further coating and crystallization. The effect of preparation method, hydrolysis dropping speed and the number of hydrothermal process on the microstructure of the ZrO_2 layer was observed. The influence of coating layer to chromaticity, heat resistance and acid stability was also investigated. The results show that a complete layer at nearly 90 nm coated on the surface of the ?-Ce_2S_3 particles. The as-prepared pigment exhibited pure red color (L* = 44.38, a* = 31.94, b* = 23.14). Moreover, this coating layer can provide protection to pigment particles. The core-shell pigment can remain red color (L* = 42.71, a* = 26.23, b* =18.38) after calcined in air at 380 癈, while uncoated pigment turned togrey dark at 360 癈.