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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

2022

Vol. 67, iss. 4

1547--1550

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.

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

2019

Vol. 64, iss. 2

547--550

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.