SUN Guoliang, WU Guoliang

(Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)

Abstract: Tea dust glazes with augite as the main crystalline phase were prepared, using AR SiO₂, Al₂O₃, MgO, CaO, and Fe₂O₃ as raw materials, and fired at different temperatures. The phase composition, microstructure and chroma of the crystalline glazes were analyzed by X-ray diffraction, scanning electron microscopy and colorimeter, respectively. The results showed that, with the firing temperature increasing, the content of augite and anorthite in the glazes firstly increased and then decreased, the morphology gradually changed from regular long columnar, flaky, and granular to irregular short columnar and tabular with holes in the center, and finally grew into irregular crystals, the overall size of the crystals firstly increased slowly and then decreased significantly, and the color of the samples turned from dark yellow into

dark yellow-green and light yellow-green.

Key words: tea dust glaze; firing temperature; crystallization; chrominance