• Title/Summary/Keyword: Powder technology

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Review on Characterization Method and Recent Research Trend about Metal Powder for Powder Bed Fusion (PBF) Process (금속 Powder Bed Fusion(PBF) 공정용 분말의 특성평가 방법 및 관련 연구 동향)

  • Lee, Bin;Kim, Dae-Kyeom;Kim, Young Il;Kim, Do Hoon;Son, Yong;Park, Kyoung-Tae;Kim, Taek-Soo
    • Journal of Powder Materials
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    • v.27 no.6
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    • pp.509-519
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    • 2020
  • A well-established characterization method is required in powder bed fusion (PBF) metal additive manufacturing, where metal powder is used. The characterization methods from the traditional powder metallurgy process are still being used. However, it is necessary to develop advanced methods of property evaluation with the advances in additive manufacturing technology. In this article, the characterization methods of powders for metal PBF are reviewed, and the recent research trends are introduced. Standardization status and specifications for metal powder for the PBF process which published by the ISO, ASTM, and MPIF are also covered. The establishment of powder characterization methods are expected to contribute to the metal powder industry and the advancement of additive manufacturing technology through the creation of related databases.

A Study on the Roll Manufacturing Technology Applying Powder Flame Spray Coating Technology of Ni-Based Alloy Powder (Ni계 합금분말 용사 코팅기술을 적용한 롤 제조기술 연구)

  • Park, Ji Woong;Kim, Soon Kook;Ban, Gye Bum
    • Journal of Powder Materials
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    • v.29 no.2
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    • pp.123-131
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    • 2022
  • The purpose of this study is to improve the mechanical properties and develop manufacturing technology through self-soluble alloy powder flame spray coating on the surface of a run-out table roller for hot rolling. The roller surface of the run-out table should maintain high hardness at high temperatures and possess high wear, corrosion, and heat resistances. In addition, sufficient bonding strength between the thermal spray coating layer and base material, which would prevent the peel-off of the coating layer, is also an important factor. In this study, the most suitable powder and process for roll manufacturing technology are determined through the initial selection of commercial alloy powder for roll manufacturing, hardness, component analysis, and bond strength analysis of the powder and thermal spray coating layer according to the powder.

Insulation and Magnetic Properties of Iron Powder Coated by Wet Chemical Method

  • Son, Hyeon-Taek;Yun, Cheol-Ho;Cha, Hyun-Rok;Kang, Chang-Seog;Bae, Jung-Chan
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1167-1168
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    • 2006
  • In this study, the pure iron powder was treated with aqueous phosphoric acid to produce phosphate insulating layer on the surface. After drying the powder, it was compacted in a mold with a diameter of 20mm at 800MPa. The powder compacts were then heat treated at $500^{\circ}C$ for 1 hour. The results showed that insulated iron powder was obtained with uniform phosphate layer by chemical reaction. With increased amount of phosphate layer, the core loss and density of compacts were decreased. It was also found that the addition of ethyl alcohol during insulating reaction resulted in improved core loss value.

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Research on Powder Metallurgy Technology in Fusion Materials in China

  • Ge, Chang-Chun;Zhou, Zhang-Jian;Du, Juan;Song, Shu-Xiang
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.896-897
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    • 2006
  • In the viewpoint of engineering, materials problem is a key problem, which determines whether the exploitation of fusion energy will be success. The most important class of fusion materials is plasma-facing materials (PFM). W, as high Z high melting-point metal is one of the most important candidate materials due to its high plasma erosion resistance. Improving the ductility of W and W based alloy, lowering its ductile-brittleness transition temperature for meeting the requirements of fusion application is an important task. In this paper, severalpowder meatllurgy methods of fabricating W and W based materials are being investigated.

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A Study on Residual Powder Removing Technique of Multi-Layered Graphene Based on Graphene One-Step Transfer Process (그래핀 원스텝 전사(Graphene One-Step Transfer) 공정 기반 다층 그래핀 잔여분말 제거 기술 연구)

  • Woo, Chae-young;Jo, Yeongsu;Hong, Soon-kyu;Lee, Hyung Woo
    • Journal of Powder Materials
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    • v.26 no.1
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    • pp.11-15
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    • 2019
  • In this study, a method to remove residual powder on a multi-layered graphene and a new approach to transfer multi-layered graphene at once are studied. A graphene one-step transfer (GOST) method is conducted to minimize the residual powder comparison with a layer-by-layer transfer. Furthermore, a residual powder removing process is investigated to remove residual powder at the top of a multi-layered graphene. After residual powder is removed, the sheet resistance of graphene is decreased from 393 to 340 Ohm/sq in a four-layered graphene. In addition, transmittance slightly increases after residual powder is removed from the top of the multi-layered graphene. Optical and atomic-force microscopy images are used to analyze the graphene surface, and the Ra value is reduced from 5.2 to 3.7 nm following residual powder removal. Therefore, GOST and residual powder removal resolve the limited application of graphene electrodes due to residual powder.

Enhancement of Microstructural Homogeneity of W-Cu Pseudo-alloy by Adding W-Cu Composite Powder in Infiltration Process

  • Hong, Moon-Hee;Choi, Jae-Ho;Lee, Seong;Kim, Eun-Pyo;Noh, Joon-Woong;Lee, Sung-Ho;Kim, Young-Moo
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.948-949
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    • 2006
  • An infiltration technique using W-Cu composite powder has been developed to enhance microstructural uniformity of W-Cu pseudo-alloy. W-Cu composite powder, manufactured by reduction from $WO_3$ and CuO powder mixtures, were blended with W powder and then cold iso-statically pressed into a cylindrical bar under 150 MPa. The pressed samples were pre-sintered at $1300^{\circ}C$ for 1 hour under hydrogen to make a skeleton structure. This skeleton structure was more homogeneous than that formed by using W and Cu powder mixtures. The skeleton structures were infiltrated with Cu under hydrogen atmosphere. The infiltrated W-Cu pseudo-alloy showed homogeneous microstructure without Cu rich region

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Powder Metallurgy of Tungsten Alloy

  • Ke, Zhang;Chun, Ge-Chang
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1151-1152
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    • 2006
  • Preparation of tungsten powder, sorts of tungsten alloys and their application in economy are made a summary in this paper.

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