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Hydrogen Reduction Behavior of Al2O3/CuO Powder Mixtures Prepared from Different Raw Powders and Their Microstructural Characteristics

원료분말에 따른 Al2O3/CuO 분말혼합체의 수소환원 거동 및 미세조직 특성

  • Oh Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Technology) ;
  • Kim Jung-Nam (Department of Materials Science and Engineering, Seoul National University of Technology) ;
  • Kang Kae-Myung (Department of Materials Science and Engineering, Seoul National University of Technology)
  • 오승탁 (서울산업대학교 신소재공학과) ;
  • 김정남 (서울산업대학교 신소재공학과) ;
  • 강계명 (서울산업대학교 신소재공학과)
  • Published : 2004.10.01

Abstract

The reduction behavior of $Al_{2}O_3/CuO$ powder mixtures, prepared from $Al_{2}O_3/CuO$ or $Al_{2}O_3/Cu-nitrate$, was investigated by using thermogravimetry and hygrometry. The powder characteristics were examined by BET, XRD and TEM. Also, the influence of powder characteristics on the microstructure and properties of hot-pressed composites was analyzed. The formation mechanism of nano-sized Cu dispersions was explained based on the powder characteristics and reduction kinetics of oxide powders. In addition, the dependence of the microstructure and mechanical properties of hot-pressed composites on powder characteristics is discussed in terms of the initial size and distribution of Cu particles. The practical implication of these results is that an optimum processing condition for the design of homogeneous microstructure and required properties can be established.

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  1. with Nano-Sized Cu Dispersions vol.23, pp.1, 2013, https://doi.org/10.3740/MRSK.2013.23.1.067