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Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications

The mismatch between elastic modulus of metal implants and bones which is also known as stress shielding, remains an unresolved issue. Porous metals are one of the most effective ways of reducing stiffness mismatches and achieving stable longterm fixation via full bone in-growth. In this work, porou...

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Main Author: Mat Noor, Fazimah
Format: Thesis
Language:English
Published: 2018
Subjects:
T Technology (General)
Online Access:http://eprints.utm.my/id/eprint/96247/1/FazimahMatNoorPRZK2018.pdf.pdf
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spelling my.utm.962472022-07-05T07:09:05Z http://eprints.utm.my/id/eprint/96247/ Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications Mat Noor, Fazimah T Technology (General) The mismatch between elastic modulus of metal implants and bones which is also known as stress shielding, remains an unresolved issue. Porous metals are one of the most effective ways of reducing stiffness mismatches and achieving stable longterm fixation via full bone in-growth. In this work, porous SS316L is produced using the foam replication technique. The samples were each produced with different compositions of SS316L powders and sintered at various sintering parameters including the sintering temperature, sintering time, heating rate and cooling rate. Scanning electron microscopy (SEM) was used to characterise the microstructure while a compression test was used to determine the mechanical properties of the samples. The physical properties including porosity and density were measured according to the Archimedes principles. The biocompatibility test showed that the porous SS316L produced, exhibited no cytotoxicity reactivity. Furthermore, the optimisations of the sintering parameters were performed using the Taguchi method. The optimised porosity of porous SS316L prepared by ball milling method was 85.44% and achieved using sintering time of 60 minutes, sintering temperature of 1200?C, heating rate of 1?C/min, SS316L composition of 60 wt% and cooling rate of 1?C/min. Whereas, for samples prepared by mechanical stirring method, the optimum porosity was 79.46% and occurred for the samples sintered within 60 minutes at 1200?C of sintering temperature, with the cooling and heating rates of 1?C/min and 2?C/min respectively, and prepared with 70 wt% of SS316L composition. In addition, porous SS316L prepared by ball milling method with modulus of elasticity of 0.08 GPa was obtained by using optimum sintering temperature of 1250?C, sintering time of 60 minutes, heating rate of 2?C/min, SS316L composition of 65 wt% and cooling rate of 1?C/min. Whereas, the modulus of elasticity of 0.05 GPa for porous SS316L prepared by mechanical stirring method was obtained by using the optimum cooling rate of 5?C/min, sintering temperature of 1200?C, sintering time of 120 minutes, SS316L composition of 70 wt% and heating rate of 0.5?C/min respectively. Following optimisation, the porous SS316L produced was found to have attractive mechanical and physical properties much like human bone. Notwithstanding, this included interconnected and open porosity in the range of 79.46 to 85.44 %, density in the range of 1.53-1.76 g/cm3, pore size in the range of 247–470 µm, modulus of elasticity in the range of 0.05-0.08 GPa, yield strength in the range of 0.52–0.82 MPa and compression strength in the range of 35.87-64.43 MPa. 2018 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/96247/1/FazimahMatNoorPRZK2018.pdf.pdf Mat Noor, Fazimah (2018) Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications. PhD thesis, Universiti Teknologi Malaysia. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:142873
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic T Technology (General)
spellingShingle T Technology (General)
Mat Noor, Fazimah
Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications
description The mismatch between elastic modulus of metal implants and bones which is also known as stress shielding, remains an unresolved issue. Porous metals are one of the most effective ways of reducing stiffness mismatches and achieving stable longterm fixation via full bone in-growth. In this work, porous SS316L is produced using the foam replication technique. The samples were each produced with different compositions of SS316L powders and sintered at various sintering parameters including the sintering temperature, sintering time, heating rate and cooling rate. Scanning electron microscopy (SEM) was used to characterise the microstructure while a compression test was used to determine the mechanical properties of the samples. The physical properties including porosity and density were measured according to the Archimedes principles. The biocompatibility test showed that the porous SS316L produced, exhibited no cytotoxicity reactivity. Furthermore, the optimisations of the sintering parameters were performed using the Taguchi method. The optimised porosity of porous SS316L prepared by ball milling method was 85.44% and achieved using sintering time of 60 minutes, sintering temperature of 1200?C, heating rate of 1?C/min, SS316L composition of 60 wt% and cooling rate of 1?C/min. Whereas, for samples prepared by mechanical stirring method, the optimum porosity was 79.46% and occurred for the samples sintered within 60 minutes at 1200?C of sintering temperature, with the cooling and heating rates of 1?C/min and 2?C/min respectively, and prepared with 70 wt% of SS316L composition. In addition, porous SS316L prepared by ball milling method with modulus of elasticity of 0.08 GPa was obtained by using optimum sintering temperature of 1250?C, sintering time of 60 minutes, heating rate of 2?C/min, SS316L composition of 65 wt% and cooling rate of 1?C/min. Whereas, the modulus of elasticity of 0.05 GPa for porous SS316L prepared by mechanical stirring method was obtained by using the optimum cooling rate of 5?C/min, sintering temperature of 1200?C, sintering time of 120 minutes, SS316L composition of 70 wt% and heating rate of 0.5?C/min respectively. Following optimisation, the porous SS316L produced was found to have attractive mechanical and physical properties much like human bone. Notwithstanding, this included interconnected and open porosity in the range of 79.46 to 85.44 %, density in the range of 1.53-1.76 g/cm3, pore size in the range of 247–470 µm, modulus of elasticity in the range of 0.05-0.08 GPa, yield strength in the range of 0.52–0.82 MPa and compression strength in the range of 35.87-64.43 MPa.
format Thesis
author Mat Noor, Fazimah
author_facet Mat Noor, Fazimah
author_sort Mat Noor, Fazimah
title Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications
title_short Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications
title_full Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications
title_fullStr Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications
title_full_unstemmed Foam replicated porous 316l stainless steel based on Taguchi method for biomedical applications
title_sort foam replicated porous 316l stainless steel based on taguchi method for biomedical applications
publishDate 2018
url http://eprints.utm.my/id/eprint/96247/1/FazimahMatNoorPRZK2018.pdf.pdf
http://eprints.utm.my/id/eprint/96247/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:142873
_version_ 1738510342719275008
score 13.211869

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