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Preparation of porous stainless steel hollow-fibers through multi-modal particle size sintering towards pore engineering

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journal contribution
posted on 2017-08-04, 00:00 authored by F-M Allioux, O David, M Etxeberria Benavides, Lingxue KongLingxue Kong, D A Pacheco Tanaka, Ludovic DumeeLudovic Dumee
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.

History

Journal

Membranes

Volume

7

Issue

3

Article number

40

Pagination

1 - 15

Publisher

MDPI AG

Location

Basel, Switzerland

ISSN

2077-0375

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2017, by the authors