Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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The Hydrogen Reduction Behavior of Ultrasonic Ball-milled WO3-CuO Nanopowder

초음파 밀링한 WO3-CuO 나노혼합분말의 수소환원 거동

  • Jung, Sung-Soo (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Yoon, Eui-Sik (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Lee, Jai-Sung (Department of Metallurgy and Materials Science, Hanyang University)
  • 정성수 (한양대학교 금속재료공학과) ;
  • 윤의식 (한양대학교 금속재료공학과) ;
  • 이재성 (한양대학교 금속재료공학과)
  • Received : 2009.05.15
  • Published : 2009.09.25
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Abstract

The hydrogen reduction behavior of ultrasonic ball-milled $WO_3-CuO$ nanopowder, which is highly related with micro-pore structure, was investigated by thermogravimetry(TG) and hygrometry system. EDS and TEM results represented that the ultrasonic ball-milled $WO_3-CuO$ nanopowder consisted of the agglomerates which was confirmed as a homogeneous mixture of $WO_3$ and CuO particles. It was found that the reduction reaction of CuO was retarded by initial micro-pores which are smaller than 40 nm in the ultrasonic ball-milled $WO_3-CuO$ nanopowder. The earlier agglomeration of Cu particles at comparably low temperature decreased the volume of micro-pores in the $WO_3-CuO$ nanopowder which caused the retardation of $WO_3$ reduction reaction. These results clearly explain that the micro-pore structure significantly affected the reduction reaction of $WO_3$ and CuO in the $WO_3-CuO$ nanopowder.

Keywords

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