• Title/Summary/Keyword: Metal Injection Molding

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Hydrogen Perm-Selectivity Property of the Palladium Hydrogen Separation Membranes on Porous Stainless Steel Support Manufactured by Metal Injection Molding (금속 사출성형 방식의 다공성 스테인리스 강 지지체에 형성된 팔라듐 수소 분리막의 투과 선택도 특성)

  • Kim, Se-Hong;Yang, Ji-Hye;Lim, Da-Sol;Kim, Dong-Won
    • Journal of the Korean institute of surface engineering
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    • v.50 no.2
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    • pp.98-107
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    • 2017

  • Pd-based membranes have been widely used in hydrogen purification and separation due to their high hydrogen diffusivity and infinite selectivity. However, it has been difficult to fabricate thin and dense Pd-based membranes on a porous stainless steel(PSS) support. In case of a conventional PSS support having the large size of surface pores, it was required to use complex surface treatment and thick Pd coating more than $6{\mu}m$ on the PSS was required in order to form pore free surface. In this study, we could fabricate thin and dense Pd membrane with only $3{\mu}m$ Pd layer on a new PSS support manufactured by metal injection molding(MIM). The PSS support had low surface roughness and mean pore size of $5{\mu}m$. Pd membrane were prepared by advanced Pd sputter deposition on the modified PSS support using fine polishing and YSZ vacuum filling surface treatment. At temperature $400^{\circ}C$ and transmembrane pressure difference of 1 bar, hydrogen flux and selectivity of $H_2/N_2$ were $11.22ml\;cm^{-2}min^{-1}$ and infinity, respectively. Comparing with $6{\mu}m$ Pd membrane, $3{\mu}m$ Pd membrane showed 2.5 times higher hydrogen flux which could be due to the decreased Pd layer thickness from $6{\mu}m$ to $3{\mu}m$ and an increased porosity. It was also found that pressure exponent was changed from 0.5 on $6{\mu}m$ Pd membrane to 0.8 on $3{\mu}m$ Pd membrane.

  • https://doi.org/10.5695/JKISE.2017.50.2.98 인용 PDF KSCI

Fabrication of Equiatomic CoCrFeMnNi High-Entropy Alloy by Metal Injection Molding Process Using Coarse-Sized Powders

  • Eun Seong Kim;Jae Man Park;Ji Sun Lee;Jungho Choe;Soung Yeoul Ahn;Sang Guk Jeong;Do Won Lee;Seong Jin Park;Hyoung Seop Kim
    • Journal of Powder Materials
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    • v.30 no.1
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    • pp.1-6
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    • 2023

  • High-entropy alloys (HEAs) are attracting attention because of their excellent properties and functions; however, they are relatively expensive compared with commercial alloys. Therefore, various efforts have been made to reduce the cost of raw materials. In this study, MIM is attempted using coarse equiatomic CoCrFeMnNi HEA powders. The mixing ratio (powder:binder) for HEA feedstock preparation is explored using torque rheometer. The block-shaped green parts are fabricated through a metal injection molding process using feedstock. The thermal debinding conditions are explored by thermogravimetric analysis, and solvent and thermal debinding are performed. It is densified under various sintering conditions considering the melting point of the HEA. The final product, which contains a small amount of non-FCC phase, is manufactured at a sintering temperature of 1250℃.

  • https://doi.org/10.4150/KPMI.2023.30.1.1 인용 PDF

Development of Direct Metal Tooling (DMT) Process for Injection Mold Core with Curved Conformal Cooling Channel (곡선형 형상적응형 냉각채널을 갖는 금형 코어 제작을 위한 DMT 공정개발)

  • Han, Ji Su;Yu, Man Jun;Lee, Min Gyu;Lee, Yoon Sun;Kim, Woo-Sung;Lee, Ho Jin;Kim, Da Hye;Sung, Ji Hyun;Cha, Kyoung Je
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.11
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    • pp.103-108
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    • 2019

  • The cooling rate and the uniformity of mold temperature, in the injection molding process, possess great influences on the productivity and quality of replications. The conformal cooling channel, which is of a uniform spacing from the mold cavity by the metal additive manufacturing process, receives much attention recently. The purpose of this study is to develop a mold core with a curved conformal cooling channel for a pottery-shaped thick-wall cosmetic container through the hybrid method of direct metal tooling (DMT) process. In this study, we design a mold core that contains the curved cooling channel for the container. A method that divides the cavity is proposed and the DMT process is carried out to form the curved cooling channel. The test mold core, with the curved conformal cooling channel, has been fabricated by the proposed method to confirm the feasibility of the design concept. We show that no leakage is observed for the additive manufactured test mold core, and its physical properties demonstrate that it can be sufficiently used as the injection mold core.

  • https://doi.org/10.14775/ksmpe.2019.18.11.103 인용 PDF KSCI