Fabrication of Metallic Particle Dispersed Ceramic Based Nanocomposite Powders by the Spray Pyrolysis Process Using Ultrasonic Atomizer and Reduction Process

  • Choa, Y.H. (Division of new Materials Eng., Chonbuk National University) ;
  • Kim, B.H. (Division of New Materials Eng., Chonbuk National University) ;
  • Jeong, Y.K. (Korea Institute of Ceramic Engineering and Technology) ;
  • Chae, K.W. (Dept. of Materials Sci. & Eng., Hoseo University) ;
  • T.Nakayama (Institute of Scientific and Industrial Research, Osaka University) ;
  • T. Kusunose (Institute of Scientific and Industrial Research, Osaka University) ;
  • T.Sekino (Institute of Scientific and Industrial Research, Osaka University) ;
  • K. Niibara (Institute of Scientific and Industrial Research, Osaka University)
  • Published : 2001.09.01

Abstract

MgO based nanocomposite powder including ferromagnetic iron particle dispersions, which can be available for the magnetic and catalytic applications, was fabricated by the spray pyrolysis process using ultra-sonic atomizer and reduction processes. Liquid source was prepared from iron (Fe)-nitrate, as a source of Fe nano-dispersion, and magnesium (Mg)-nitrate, as a source of MgO materials, with pure water solvent. After the chamber were heated to given temperatures (500~$^800{\circ}C$), the mist of liquid droplets generated by ultrasonic atomizer carried into the chamber by a carrier gas of air, and the ist was decomposed into Fe-oxide and MgO nano-powder. The obtained powders were reduced by hydrogen atmosphere at 600~$^800{\circ}C$. The reduction behavior was investigated by thermal gravity and hygrometry. After reduction, the aggregated sub-micron Fe/MgO powders were obtained, and each aggregated powder composed of nano-sized Fe/MgO materials. By the difference of the chamber temperature, the particle size of Fe and MgO was changed in a few 10 nm levels. Also, the nano-porous Fe-MgO sub-micron powders were obtained. Through this preparation process and the evaluation of phase and microstructure, it was concluded that the Fe/MgO nanocomposite powders with high surface area and the higher coercive force were successfully fabricated.

Keywords

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