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1
Content available Microstructure and Pore Characteristics of a SUS316L Gas Filter Fabricated by Wet Powder Spraying
Lee Min-Jeong, Yi Yu-Jeong, Kim Hyeon-Ju, Park Manho, Lee Jungwoo, Yun Jung-Yeul
Archives of Metallurgy and Materials
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2022
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Vol. 67, iss. 4
1547--1550
EN
In this study, a flake-shaped metal powder was coated on a tube shaped pre-sintered 316L stainless steel support using a wet powder spraying process to fabricate a double pore structure, and the pore characteristics were analyzed according to coating time and tube rotation speed. The thickness of the coated layer was checked via optical microscopy, and porosity was measured using image analysis software. Air permeability was measured using a capillary flow porometer. As a result of the experiment, the optimal rotation speed of the support tube was established as 200 rpm. When the rotation speed was fixed, the coating thickness and the coating amount of the double pore structure increased as the coating time increased. The porosity of the double pore structure was increased due to the irregular arrangement of the flake-shaped powder. The air permeability of the double pore structure decreased with increasing fine pore layer thickness.
2
Content available Fabrication of Metal Gas Filter by Material Extrusion Additive Manufacturing Process
Yi Yu-Jeong, Lee Min-Jeong, Yun Su-Jin, Park Manho, Kim Ju-Yong, Lee Jungwoo, Yun Jung-Yeul
Archives of Metallurgy and Materials
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2022
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Vol. 67, iss. 4
1517--1520
EN
Recently, 3D printing processes have been used to manufacture metal powder filters with manufacturing complex-shape. In this study, metal powder filters of various shapes were manufactured using the metal extrusion additive manufacturing (MEAM) process, which is used to manufacture three-dimensional structures by extruding a filament consisting of a metal powder and a binder. Firstly, filaments were prepared by appropriately mixing SUS316 powder with sizes ranging from 7.5 µm to 50 µm and a binder. These filaments were extruded at temperatures of 100℃ to 160℃ depending on the type of filament being manufactured, to form three types of cylindrical filter. Specimens were sintered in a high vacuum atmosphere furnace at 850℃ to 1050℃ for 1 hour after debinding. The specimens were analyzed for permeability using a capillary flow porometer, porosity was determined by applying Archimedes’ law and microstructure was observed using SEM.
3
Content available Fabrication and Pore Properties of SUS316L Membrane with Double-Layered Pore Structures by Wet Powder Spraying
Lee Min-Jeong, Kim Hyeon-Ju, Park Manho, Yun Jung-Yeul
Archives of Metallurgy and Materials
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2022
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Vol. 67, iss. 4
1531--1534
EN
In this study, a SUS316L membrane having double layered pore structures was fabricated, and the pore characteristics were analyzed after coating with a spherical powder and a flake-shaped powder on a disk-shaped SUS316L support using a wet powder spraying process. The thickness of the coated layer was checked using an optical microscope, and air permeability was measured using a capillary flow porometer. When the coating amount was similar, the fine porous layer prepared using flake powder was thicker and showed higher porosity. In the case of a similar thickness, the case of using flake powder was half of the amount of spherical powder used. Therefore, it was confirmed that it is possible to manufacture a metal membrane having a high filter efficiency even with a small coating amount when using the flake powder.
4
Content available Fabrication and Compressive Properties of Open-Cell Ni-Mo-Cr (Hastelloy) Foams Manufactured by Electrostatic Powder Spraying
Kang Tae-Hoon, Kim Kyu-Sik, Lee Min-Jeong, Yun Jung-Yeul, Lee Kee-Ahn
Archives of Metallurgy and Materials
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2020
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Vol. 65, iss. 3
1081--1086
EN
An open-cell Ni-Mo-Cr foam was newly manufactured using electrostatic powder spraying process and its room-temperature compressive properties were investigated in this study. For manufacturing Ni-Mo-Cr foam, Ni-Mo-Cr powders were sprayed on the polyurethane pre-form by electrostatic powder spraying process. And then, Ni-Mo-Cr powder sprayed pre-forms were sintered at 1200°C, 1250°C, and 1300°C, respectively. The relative densities of Ni-Mo-Cr foams were measured at 4 ~ 5%. Room tempera-ture compressive curves of ESP Ni-Mo-Cr foams represented the typical compressive 3-stages (elastic, plateau, densification) of open-cell metallic foam. As a result of observation of deformed specimen, the fracture mode found to be changed from brittle to ductile as sintering temperature increased. Based on these findings, correlations between structural characteristics, microstructure, and compressive deformation behavior were also discussed.
5
Content available Effect of Powder Shape and Sintering Temperature on the Preparation of Ni-Based Porous Metal
Yi Yu-Jeong, Lee Min-Jeong, Kim Hyeon-Ju, Yang Sangsun, Park Man-Ho, Kim Byoung-Kee, Yun Jung-Yeul
Archives of Metallurgy and Materials
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2019
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Vol. 64, iss. 3
917--920
EN
Usually porous metals are known as relatively excellent characteristic such as large surface area, light, lower heat capacity, high toughness and permeability for exhaust gas filter, hydrogen reformer catalyst support. The Ni alloys have high corrosion resistance, heat resistance and chemical stability for high temperature applications. In this study, the Ni-based porous metals have been developed with Hastelloy powder by gas atomization and water atomization in order to find the effects of powder shape on porous metal. Each Hastelloy powder is pressed on disk shape of 2 mm thickness with 12 tons using uniaxial press machine. The specimens are sintered at various temperatures in high vacuum condition. The pore properties were evaluated using Porometer and microstructures were observed with SEM.
6
Content available A Study on Pore Properties of Hastelloy Powder Porous Metal Fabricated by Electrostatic Powder Coating
Lee Min-Jeong, Yi Yu-Jeong, Kim Hyeon-Ju, Park Man-Ho, Kim Byoung-Kee, Yun Jung-Yeul
Archives of Metallurgy and Materials
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2019
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Vol. 64, iss. 2
547--550
EN
Porous metals show not only extremely low density, but also excellent physical, mechanical and acoustic properties. In this study, Hastelloy powders prepared by gas atomization are used to manufacture 3D geometries of Hastelloy porous metal with above 90% porosity using electrostatic powder coating process. In order to control pore size and porosity, foam is sintered at 1200~1300°C and different powder coating amount. The pore properties are evaluated using SEM and Archimedes method. As powder coating amount and sintering temperature increased, porosity is decreased from 96.4 to 94.4%. And foam density is increased from 0.323 to 0.497 g/cm3 and pore size is decreased from 98 to 560 μm. When the sintering temperature is increased, foam thickness and strut thickness are decreased from 9.85 to 8.13 mm and from 366 to 292 μm.
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