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Metals 2017, 7(4), 120; doi:10.3390/met7040120

Rheological Characterization of Powder Mixture Including a Space Holder and Its Application to Metal Injection Molding

1
School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
2
Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Manoj Gupta
Received: 23 February 2017 / Revised: 28 March 2017 / Accepted: 28 March 2017 / Published: 30 March 2017
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Abstract

Metal injection molding (MIM) with the space holder technique is becoming one of the important fabrication methods for a net-shape production of micro-sized, porous, complex-shaped metal parts. For a successful injection molding step, rheological behavior of MIM feedstock is essential, which includes peculiar characteristics, such as a wall slip phenomenon. SUS 316L stainless steel powder, binder systems (paraffin wax, polypropylene, polyethylene, stearic acid) and three different sizes of spherically-shaped polymethyl methacrylate (PMMA) as a space-holder were used for this study. The porosity was controlled by varying the volume fraction of the space holder and a total of six different feedstocks were prepared. Rheological characteristics of the feedstock was investigated, especially on viscosities, including wall slip quantification by using a capillary rheometer. By thermogravimetric analysis, the debinding process for completely removing the space holder was proposed. Finally, the shrinkage and porosity of the tensile specimen produced through the sintering process were analyzed and the ultimate tensile strength was obtained. View Full-Text
Keywords: metal injection molding; rheological characterization; feedstock rheology; space holder; porous metal injection molding; slip phenomena; highly-filled suspension flow metal injection molding; rheological characterization; feedstock rheology; space holder; porous metal injection molding; slip phenomena; highly-filled suspension flow
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MDPI and ACS Style

Park, S.J.; Kim, D.; Lin, D.; Park, S.J.; Ahn, S. Rheological Characterization of Powder Mixture Including a Space Holder and Its Application to Metal Injection Molding. Metals 2017, 7, 120.

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