Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Formation of Hybridized Porous Structure of Al Alloy by Alkali Surface Modification

알칼리 표면개질을 통한 다공성 알루미늄 합금의 하이브리드 기공구조 형성

  • Seo, Young-Ik (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Young-Moon (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Young-Jung (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Dae-Gun (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Kyu-Hwan (Computational Science Center, Korea Institute of Science and Technology) ;
  • Kim, Young-Do (Division of Materials Science and Engineering, Hanyang University)
  • 서영익 (한양대학교 신소재공학부) ;
  • 김영문 (한양대학교 신소재공학부) ;
  • 이영중 (한양대학교 신소재공학부) ;
  • 김대건 (한양대학교 신소재공학부) ;
  • 이규환 (한국과학기술연구원) ;
  • 김영도 (한양대학교 신소재공학부)
  • Published : 2009.02.28
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Abstract

To improve the filtration efficiency of porous materials used in filters, an extensive specific surface area is required to serve as a site for adsorption of impurities. In this paper, a method for creating a hybridized porous alloy using a powder metallurgical technique to build macropores in an Al-4 wt.% Cu alloy and subsequent surface modification for a microporous surface with a considerably increased specific surface area is suggested. The macropore structure was controlled by granulation, compacting pressure, and sintering; the micropore structure was obtained by a surface modification using a dilute NaOH solution. The specific surface area of surface-modified specimen increased about 10 times compare to as-sintered specimen that comprised of the macropore structure. Also, the surface-modified specimens showed a remarkable increase in micropores larger than 10 nm. Such a hybridized porous structure has potential for application in water and air purification filters, as well as membrane pre-treatment and catalysis.

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