• Title/Summary/Keyword: Metal Injection Molding

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New Process for Ti Alloy Powder Production by Using Gas Atomization

  • Fujita, Makoto;Arimoto, Nobuhiro;Nishioka, Kazuo;Miura, Hideshi
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09a
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    • pp.12-13
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    • 2006

  • The spherical and high quality Titanium fine powder "Tilop" has been produced with gas atomization furnace, Sumitomo Titanium Corporation originally designed. Recently, a new process which can produce Ti-alloy(Ti-6Al-4V) powders by utilizing our gas atomization process, of which raw material is sponge titanium pre-mixed with alloy chips or granules has been also developed. The particle size of gas atomized Ti-alloy powder and the mechanical properties of sintered Ti-alloy compacts prepared by metal injection molding were discussed in this study.

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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 Surface Science and 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