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http://dx.doi.org/10.6111/JKCGCT.2013.23.5.255

Preparation and characterization of CoAl2O4 blue ceramic nano pigments by attrition milling  

Lee, Ki-Chan (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Yoon, Jong-Won (Department of Advanced Materials Science and Engineering, Dankook University)
Kim, Jin-Ho (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Hwang, Kwang-Taek (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Han, Kyu-Sung (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.23, no.5, 2013 , pp. 255-264 More about this Journal
Abstract
Cobalt aluminate ($CoAl_2O_4$) is a highly stable pigment with excellent resistance to light, weather, etc., which has resulted in widespread use as a ceramic pigment. Due to the unique optical characteristics, $CoAl_2O_4$ is generally used as a coloring agent to decorate porcelain products, glass, paints and plastics. Here, $CoAl_2O_4$ pigments were synthesized by polymerized complex method and solid state reaction. Then $CoAl_2O_4$ pigment were grinded using the attrition milling with 1 mm size zirconia ball for 3 hours. The attrition milling process was performed at the constant speed of 800 rpm and ball to powder weight ratio (BPR) was 100 : 1. The characteristics of synthesized pigment were analyzed by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), particle size analyser (PSA) and CIE $L^*a^*b^*$. The XRD patterns of $CoAl_2O_4$ show single phase spinel structure. The particle size of $CoAl_2O_4$ measured by FE-SEM, TEM and PSA analysis was in the range of 100~200 nm. The blue color of obtained $CoAl_2O_4$ pigments could be confirmed through CIE $L^*a^*b^*$ measurement.
Keywords
$CoAl_2O_4$; Polymerized complex method; Solid state reaction; Ceramic pigment; attrition milling;
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