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J. Korean Ceram. Soc. > Volume 47(6); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(6): 603.
doi: https://doi.org/10.4191/kcers.2010.47.6.603
Co-Doped Willemite 파란색 안료의 합성과 생성기구
황동하, 한경섭1, 이병하
명지대학교 공과대학 신소재공학과
Synthesis and Formation Mechanism of Cobalt Doped Willemite Blue Pigments
Dong-Ha Hwang, Kyong-Sop Han1, Byung-Ha Lee
Department of Material Science & Engineering, Myongji University
1Division of Material Science, KIST
Turquoise blue pigment of Vanadium-zircon blue (DCMA number 14-42-2), which was already commercialized, was stable to be reproduced but insufficient to give strong blue. However, it possible to obtain more intense blue by partially substituting cobalt ions into the willemite($Zn_2SiO_4$) lattice classified into DCMA number 7-10-2 for blue ceramic pigment. By the composition of willemite $Co_xZn_{2-x}SiO_4$(X=0.01, 0.03, 0.05, 0.07, 0.09 mole), this study used reagent grade zinc oxide, cobalt oxide and silicon dioxide as starting materials, carrying out the synthesis with solid reaction method by adding $H_3BO_3$ as a mineralizer. The firing temperature was between $1200^{circ}C$ and $1400^{circ}C$. The characteristics of synthesized pigment were analyzed by X-ray diffraction, Raman spectroscopy and SEM and the characteristics of color tones were analyzed by UV-Vis spectroscopy and CIE-$L^*a^*b^*$ measurement. As a result, the optimal composition was $Zn_{1.95}Co_{0.05}$ with 1wt% of $H_3BO_3$ as a mineralizer and firing condition was $1350^{circ}C$/3 h. $L^*a^*b^*$ value was 29.25, 41.03, -59.93 for on glaze pigment and 37.03, 36.41, -60.03 for under glaze pigment.
Key words: Willemite, $Co_xZn_{2-x}SiO_4$ pigment, Color properties, Blue ceramic pigment
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