Compaction behavior of bimodal iron nanopowder agglomerate

Title
Compaction behavior of bimodal iron nanopowder agglomerate
Author
이재성
Keywords
Fe nanopowder; Spherical agglomerate; Bimodal size distribution; Compaction behavior
Issue Date
2018-07
Publisher
ELSEVIER SCIENCE BV
Citation
POWDER TECHNOLOGY, v. 338, Page. 333-341
Abstract
The compaction behavior of structure-modified Fe nanopowders having agglomerates of spherical shape and a bimodal particle size distribution was investigated in terms of the particle packing and microstructure during compaction process. To fabricate the structure-modified Fe nanopowders, the spray-dried Fe2O3 nanopowder was hydrogen reduced at 400, 450 and 550 degrees C to control the degree of particle growth in agglomerates. The compaction behavior of fabricated Fe nanopowders was investigated by two different ways. In die compaction experiments, it was found that the bimodal nanopowder reduced at 550 degrees C showed higher green density compared to nanopowders reduced at 400 and 450 degrees C over the entire range of compacting pressure. Furthermore, the compact of the bimodal nanopowder achieved a remarkable green density over 80% of theoretical density (TD) at 1000 MPa pressure without any defects due to the effective packing by filling the interstices between the large nanoparticles with small nanoparticles. The obtained density-pressure data was fitted by the Panelli and Ambrozio Filho equation to compare the densification capacity between the fabricated Fe nanopowders. To investigate the agglomerate deformation occurrence at the low pressure range, a continuous compaction experiment was conducted; the observations were explained in terms of microstructural development on the basis of the apparent yield pressure obtained from continuous densification curves. (C) 2018 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0032591018304819http://repository.hanyang.ac.kr/handle/20.500.11754/81221
ISSN
0032-5910
DOI
10.1016/j.powtec.2018.06.041
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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