Prof. Jai-Sung Lee

Prof. Jai-Sung Lee

Department of Metallurgy and Materials Science, Hanyang University-ERICA, Ansan, Korea

 

Advances in processing of Ferrous PM Microcomponents using Nano powders

Microsystem technology (MST) components have been used for commercial application such as sensor in automobiles and medical devices. In the last few years, micro-powder injection molding (PIM) has been explored as a fabrication method of microcomponents for application such as microsystems technology. Such a net-shaping process of microcomponents using powder technology inevitably needs ultrafine powders as a raw material. Those powders are expected to be in a nanoscale alloyed or composite state with uniform chemical composition and so reach easily full density by pressureless sintering. However, the consolidation of a low green density compact as the brown part by pressureless sintering has troubles with satisfying full densification as well as fine microstructure.
In this presentation our recent works on a breakthrough PM technology for processing net-shaped ferrous PM microcomponents using nano powders are introduced. The key idea of this technology is based upon the optimization of structure design and full density processing of agglomerated nano powders into either 2-dimensional or 3-dimensional microcomponents. In this case it is essential to understand the roles of hierarchical interfaces in nanopowder agglomerates on full density nanopowder materials even only by pressureless sintering. Entire processes during net-shaping of iron based nano powders are discussed in terms of microstructures and related material properties.

 

 

Prof. Jai-Sung Lee

Department of Metallurgy and Materials Science, Hanyang University-ERICA,

55 Hanyangdaehak-ro, Sangnok-gu, Ansan Kyeonggi-do, 426-791, Korea

 

email jslee[at]hanyang.ac.kr

URL www.hanyang.ac.kr