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

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2013, 23(5), pp.255-264
  • DOI : 10.6111/JKCGCT.2013.23.5.255
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : August 26, 2013
  • Accepted : September 23, 2013

Ki-Chan Lee 1,  Jong-Won Yoon 2,  Jinho Kim 1,  Kwangtaek Hwang 1,  Han Kyu Sung 1

1한국세라믹기술원
2단국대학교

Accredited

ABSTRACT

Cobalt aluminate (CoAl2O4) 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, CoAl2O4 is generally used as a coloring agent to decorate porcelain products, glass, paints and plastics. Here, CoAl2O4 pigments were synthesized by polymerized complex method and solid state reaction. Then CoAl2O4 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 CoAl2O4 show single phase spinel structure. The particle size of CoAl2O4 measured by FE-SEM, TEM and PSA analysis was in the range of 100~200 nm. The blue color of obtained CoAl2O4 pigments could be confirmed through CIE L*a*b* measurement.

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