Particle size effect on the magneto-rheological behavior of powder injection molding feedstock

Title
Particle size effect on the magneto-rheological behavior of powder injection molding feedstock
Author(s)
정임두[정임두]박장민여지훈[여지훈]강태곤[강태곤]김시조[김시조]박성진[박성진]
Keywords
MIXTURES
Issue Date
201408
Publisher
ELSEVIER SCIENCE INC
Citation
MATERIALS CHARACTERIZATION, v.94, pp.19 - 25
Abstract
Powder injection molding is one of the important manufacturing technologies for the net-shape production of metallic and ceramic components. This technology can also be a promising process for mass production of magnetic parts with complex geometries. In the magnetic powder injection molding process, powder characteristics and magneto-rheological behavior of the feedstock are significant factors affecting the final product quality. In the present study, we've investigated the magnetorheological behaviors of 17-4 PH feedstock by using a rotational rheometer. Particularly, the effects of particle size and magnetic flux density on the magneto-rheology of the feedstock were studied in detail. An upper limit on viscosity increase with the external magnetic field was found, which depended on the shear rate and the size of magnetic particles. Higher shear rate reduced the viscosity of feedstock, while larger particles with a wider distribution in size showed relatively lower viscosity. These magnetorheological behaviors were characterized with our empirical models, which can be directly applied to the process optimization of powder injection molding for magnetic components. (C) 2014 Elsevier Inc. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/31148http://dx.doi.org/10.1016/j.matchar.2014.05.004
ISSN
1044-5803
Appears in Collections:
공과대학 > 기계공학부 > Articles
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