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Membranes 2017, 7(3), 40; doi:10.3390/membranes7030040

Preparation of Porous Stainless Steel Hollow-Fibers through Multi-Modal Particle Size Sintering towards Pore Engineering

1
Deakin University, Institute for Frontier Materials, Geelong, VIC 3216, Australia
2
Tecnalia, Energy and Environment Division, Mikeletegi Pasealekua 2, 20009 San Sebastian-Donostia, Spain
*
Author to whom correspondence should be addressed.
Received: 31 May 2017 / Revised: 11 July 2017 / Accepted: 31 July 2017 / Published: 4 August 2017
(This article belongs to the Special Issue Seven Years of Membranes: Feature Paper 2017)
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Abstract

The sintering of metal powders is an efficient and versatile technique to fabricate porous metal elements such as filters, diffusers, and membranes. Neck formation between particles is, however, critical to tune the porosity and optimize mass transfer in order to minimize the densification process. In this work, macro-porous stainless steel (SS) hollow-fibers (HFs) were fabricated by the extrusion and sintering of a dope comprised, for the first time, of a bimodal mixture of SS powders. The SS particles of different sizes and shapes were mixed to increase the neck formation between the particles and control the densification process of the structure during sintering. The sintered HFs from particles of two different sizes were shown to be more mechanically stable at lower sintering temperature due to the increased neck area of the small particles sintered to the large ones. In addition, the sintered HFs made from particles of 10 and 44 μm showed a smaller average pore size (<1 μm) as compared to the micron-size pores of sintered HFs made from particles of 10 μm only and those of 10 and 20 μm. The novel HFs could be used in a range of applications, from filtration modules to electrochemical membrane reactors. View Full-Text
Keywords: porous stainless steel hollow-fiber; metal membrane; multi-modal distributions; coalescence; neck formation porous stainless steel hollow-fiber; metal membrane; multi-modal distributions; coalescence; neck formation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Allioux, F.-M.; David, O.; Etxeberria Benavides, M.; Kong, L.; Pacheco Tanaka, D.A.; Dumée, L.F. Preparation of Porous Stainless Steel Hollow-Fibers through Multi-Modal Particle Size Sintering towards Pore Engineering. Membranes 2017, 7, 40.

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