Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

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 8.13mm and from 366 to 292 μm.

Go to article

Authors and Affiliations

Min-Jeong Lee
Yu-Jeong Yi
Hyeon-Ju Kim
Manho Park
Byoung-Kee Kim
Jung-Yeul Yun
Download PDF Download RIS Download Bibtex

Abstract

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.

Go to article

Authors and Affiliations

Yu-Jeong Yi
Min-Jeong Lee
Hyeon-Ju Kim
Sangsun Yang
Manho Park
Byoung-Kee Kim
Jung-Yeul Yun
Download PDF Download RIS Download Bibtex

Abstract

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.
Go to article

Authors and Affiliations

Yu-Jeong Yi
1 2
ORCID: ORCID
Min-Jeong Lee
1 2
ORCID: ORCID
Su-Jin Yun
1
ORCID: ORCID
Manho Park
3
ORCID: ORCID
Ju-Yong Kim
4
ORCID: ORCID
Jungwoo Lee
2
ORCID: ORCID
Jung-Yeul Yun
1
ORCID: ORCID

  1. Korea Institute of Materials Science (KIMS), Metal Powder Department, Changwon, 51508, Republic of Korea
  2. Pusan National University, Department of Materials Science and Engineering, Busan, 46241, Republic of Korea
  3. R&D Center, ASFLOW CO. Ltd, Hwasung, 16648, Republic of Korea
  4. 3DP R&D Center, REPROTECH, Suwon, 16229, Republic of Korea
Download PDF Download RIS Download Bibtex

Abstract

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.
Go to article

Authors and Affiliations

Min-Jeong Lee
1 2
ORCID: ORCID
Yu-Jeong Yi
1 2
ORCID: ORCID
Hyeon-Ju Kim
1
ORCID: ORCID
Manho Park
3
ORCID: ORCID
Jungwoo Lee
2
ORCID: ORCID
Jung-Yeul Yun
1
ORCID: ORCID

  1. Korea Institute of Materials Science (KIMS), Metal Powder Department, Changwon, 51508, Republic of Korea
  2. Pusan National University, Department of Materials Science and Engineering, Busan, 46241, Republic of Korea
  3. R&D Center, ASFLOW Co. Ltd, Hwasung, 16648, Republic of Korea

This page uses 'cookies'. Learn more