Correlation between porosity and permeability of stainless steel filters with gradient porosity produced by SLS/SLM
ISSN: 1355-2546
Article publication date: 15 August 2019
Issue publication date: 8 January 2020
Abstract
Purpose
Porous structures have been widely used in filtration, medical implants and aerospace field. In the filtration field, the study of permeability of the porous structures is of great importance. This paper aims to study the influence of selective laser sintering/melting (SLS/SLM) process parameters on porosity and permeability of stainless steels filters with gradient porosity (FGM).
Design/methodology/approach
AISI 316L stainless steel powder was used to manufacture FGM filters by varying the hatch distance while other process parameters were fixed. The relationship between porosity and permeability of such FGM filters was investigated by means of Archimedes’ and Forchheimer’s laws. The gradient of porosity was also analyzed by means of micro-computed tomography.
Findings
The results have confirmed the ability of SLS/SLM in controlling porosity of the final product by varying the hatch distance. Further, the results allow to assume that FGM filters will have particle retention capacity related to lowest porosity value (which in turn is associated with the lowest hatch distance value used), while it will work at lower pressure drops – or at higher flow rates for equal pressure drop – when compared to a filter without gradient porosity.
Originality/value
Some research found in recent literature has showed the relationship between SLS/SLM process parameters and permeability of stainless steel porous structures. However, this paper fulfils the need to understand the relationship between SLS/SLM process parameters, porosity and permeability behavior of functionally graded porous structures (FGM filters).
Keywords
Acknowledgements
The authors gratefully acknowledge the financial support from PETROBRAS (through the Human Resources Training Program – PFRH), from CNPQ and from Federal Institute of Education, Science and Technology of Santa Catarina (through the Intern Qualification Program – PIQIFC) and the technical support from CERMAT-UFSC, CERTI, ALKIMAT, HOGANAS, WEG and IFSC.
Citation
Fogliatto, A.A.B., Ahrens, C.H., Wendhausen, P.A.P., Santos, E.C. and Rodrigues, D. (2020), "Correlation between porosity and permeability of stainless steel filters with gradient porosity produced by SLS/SLM", Rapid Prototyping Journal, Vol. 26 No. 1, pp. 73-81. https://doi.org/10.1108/RPJ-09-2018-0224
Publisher
:Emerald Publishing Limited
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