Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Die Compaction and Sintering Behavior of Fe Micro-nano-powder Feedstock for Micro-PIM

마이크로 PIM용 Fe 마이크로-나노 혼합분말 피드스톡의 다이성형 및 소결거동

  • You, Woo-Kyung (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Choi, Joon-Phil (Department of Metallurgy and Materials Science, Hanyang University) ;
  • Lee, Jai-Sung (Department of Metallurgy and Materials Science, Hanyang University)
  • 유우경 (한양대학교 금속재료공학과) ;
  • 최준필 (한양대학교 금속재료공학과) ;
  • 이재성 (한양대학교 금속재료공학과)
  • Received : 2010.08.02
  • Published : 2011.01.25
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Abstract

The present investigation was performed on the die compaction and sintering behavior of Fe micro-nano mixed powder with a mixed binder for powder injection molding. Warm die compaction of the feedstock for simulation of the static injection molding process was conducted using a cylindrical mold of 10 mm diameter at $100^{\circ}C$ under 4MPa. The die compaction of the micro-nanopowder feedstock underwent a uniform molding behavior showing a homogeneous distribution of nanopowders among the micropowders without porosity and distortion. After debinding, the powder compact maintained a uniform structure without crack and distortion, leading to a high green density of 64.2% corresponding to the initial powder loading of 65%. The sintering experiment showed that the micro-nanopowder compact underwent a near full and isotropic densification process during sintering. It was observed that the nanopowders effectively suppressed the growth of micropowder grains during densification process. Conclusively, the use of nanopowder for PIM feedstock might provide a new concept for processing a full density PIM parts with fine microstructure.

Keywords

Acknowledgement

Grant : 마이크로 기능성 초정밀 핵심요소부품 제조기반기술개발-PIM 기술을 이용한 마이크로 무빙 제어부품 초정밀 제조기술

Supported by : 지식경제부

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