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Analysis of the rheological behavior of Fe trimodal micro-nano powder feedstock in micro powder injection molding

Title
Analysis of the rheological behavior of Fe trimodal micro-nano powder feedstock in micro powder injection molding
Author
이재성
Keywords
mu-PIM; Fe trimodal powder feedstock; Powder loading; Torque rheometer; Viscosity; Moldability; NONSPHERICAL PARTICLES; MICROSTRUCTURAL DEVELOPMENT; SINTERING BEHAVIOR; TERNARY MIXTURES; PACKING; NANOPOWDER; VISCOSITY; MIM; TECHNOLOGY; PARAMETERS
Issue Date
2017-06
Publisher
ELSEVIER SCIENCE BV
Citation
POWDER TECHNOLOGY, v. 319, Page. 253-260
Abstract
The rheological behavior of Fe trimodal powder feedstock for mu-PIM was investigated using torque rheometer analysis. The feedstock was prepared by mixing Fe micropowder (-4 mu m) and nanopowder agglomerates containing discrete particles with sizes of similar to 300 nm and similar to 30 nm, with low viscosity wax-based binders. During the feedstock mixing, a significant increase in mixing torque was observed at powder content above 72 vol% in the feedstock, indicating the critical powder loading. The results obtained from the torque rheometer experiment at selected powder loadings of 66-74 vol% were used as fundamental rheological parameters including flow behavior index (n), flow activation energy (E), and general moldability index (alpha(stv)). In addition, the influence of shear rate, temperature, and powder loading on feedstock viscosity was evaluated. It was found that the feedstock with 72 vol% powder loading exhibited the best rheological behavior with the highest moldability parameter and homogeneous microstructure. Due to the lack of research on the trimodal system in the field of powder metallurgy and powder technology, this paper provides the possibility of applying the trimodal powder mixture to a near net-shape production technique such as PIM. (C) 2017 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0032591017305132https://repository.hanyang.ac.kr/handle/20.500.11754/72149
ISSN
0032-5910; 1873-328X
DOI
10.1016/j.powtec.2017.06.056
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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