Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques

This work aims to investigate the mechanical performance and biodegradation behaviour of magnesium-zinc/hydroxyapatite (Mg-Zn/HA) composite that was fabricated via different powder mixing techniques. The powder mixing techniques of the composite was mainly divided into two, the first one is single s...

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Main Author:	Rodzi, Siti Nur Hazwani Mohamad
Format:	Thesis
Language:	English
Published:	2015
Subjects:	T Technology
Online Access:	http://eprints.usm.my/46685/1/Properties%20Of%20Biocompatible%20Mg-Zn%20Hydroxyapatite%20Composites%20Fabricated%20By%20Different%20Powder%20Mixing%20Techniques.pdf
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spelling	my-usm-ep.466852021-11-17T03:42:19Z Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques 2015 Rodzi, Siti Nur Hazwani Mohamad T Technology TA401-492 Materials of engineering and construction. Mechanics of materials This work aims to investigate the mechanical performance and biodegradation behaviour of magnesium-zinc/hydroxyapatite (Mg-Zn/HA) composite that was fabricated via different powder mixing techniques. The powder mixing techniques of the composite was mainly divided into two, the first one is single step processing which involved the mechanical alloying and mechanical milling techniques, while the second is double step processing which involved the combination of mechanical alloying and mechanical milling. The optimum mechanical properties and biodegradation behaviour of the composite was achieved when the powders were prepared using mechanical alloying technique with the milling time of 4 hours and milling speed of 220 rpm. The composite prepared through the mechanical alloying technique was then subjected to various milling time to investigate the effect of milling time towards the properties of the composite. Mg-Zn/HA composite which was fabricated through the mechanical alloying technique and milled for 6 hours attained the best combination of improved corrosion behaviour as well as mechanical properties which is due to lowest corrosion rate (0.1487 mm/year by electrochemical polarization and 0.34 x 10-3 mm/year by immersion test) and acceptable microhardness (64 HV) and compressive strength (193 MPa). Fabrication of the biodegradable composite through the mechanical alloying technique within the 6 hours milling time was found to be suitable for the implant application, due to good mechanical strength and biodegradation behaviour. In term of biocompatibility, generally Mg-Zn/HAcomposite possessed good bioactivity characteristics through the immersion test, however immersion time of 24 hours was found to be insufficient to produce composites that can satisfy the initial bone mineralization which the Ca:P ratio in the range of 1:1 to 1:1.67. However, Mg-Zn/HA composite that was fabricated through single step processing of mechanical milling (Ca:P ratio of 1.76) was found to have the highest bioactivity over the other two composites that was fabricated through single step processing of mechanical alloying and double step processing. 2015 Thesis http://eprints.usm.my/46685/ http://eprints.usm.my/46685/1/Properties%20Of%20Biocompatible%20Mg-Zn%20Hydroxyapatite%20Composites%20Fabricated%20By%20Different%20Powder%20Mixing%20Techniques.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology T Technology
spellingShingle	T Technology T Technology Rodzi, Siti Nur Hazwani Mohamad Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques
description	This work aims to investigate the mechanical performance and biodegradation behaviour of magnesium-zinc/hydroxyapatite (Mg-Zn/HA) composite that was fabricated via different powder mixing techniques. The powder mixing techniques of the composite was mainly divided into two, the first one is single step processing which involved the mechanical alloying and mechanical milling techniques, while the second is double step processing which involved the combination of mechanical alloying and mechanical milling. The optimum mechanical properties and biodegradation behaviour of the composite was achieved when the powders were prepared using mechanical alloying technique with the milling time of 4 hours and milling speed of 220 rpm. The composite prepared through the mechanical alloying technique was then subjected to various milling time to investigate the effect of milling time towards the properties of the composite. Mg-Zn/HA composite which was fabricated through the mechanical alloying technique and milled for 6 hours attained the best combination of improved corrosion behaviour as well as mechanical properties which is due to lowest corrosion rate (0.1487 mm/year by electrochemical polarization and 0.34 x 10-3 mm/year by immersion test) and acceptable microhardness (64 HV) and compressive strength (193 MPa). Fabrication of the biodegradable composite through the mechanical alloying technique within the 6 hours milling time was found to be suitable for the implant application, due to good mechanical strength and biodegradation behaviour. In term of biocompatibility, generally Mg-Zn/HAcomposite possessed good bioactivity characteristics through the immersion test, however immersion time of 24 hours was found to be insufficient to produce composites that can satisfy the initial bone mineralization which the Ca:P ratio in the range of 1:1 to 1:1.67. However, Mg-Zn/HA composite that was fabricated through single step processing of mechanical milling (Ca:P ratio of 1.76) was found to have the highest bioactivity over the other two composites that was fabricated through single step processing of mechanical alloying and double step processing.
format	Thesis
qualification_level	Master's degree
author	Rodzi, Siti Nur Hazwani Mohamad
author_facet	Rodzi, Siti Nur Hazwani Mohamad
author_sort	Rodzi, Siti Nur Hazwani Mohamad
title	Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques
title_short	Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques
title_full	Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques
title_fullStr	Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques
title_full_unstemmed	Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques
title_sort	properties of biocompatible mg-zn hydroxyapatite composites fabricated by different powder mixing techniques
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral
publishDate	2015
url	http://eprints.usm.my/46685/1/Properties%20Of%20Biocompatible%20Mg-Zn%20Hydroxyapatite%20Composites%20Fabricated%20By%20Different%20Powder%20Mixing%20Techniques.pdf
_version_	1747821712337010688

Properties Of Biocompatible Mg-Zn Hydroxyapatite Composites Fabricated By Different Powder Mixing Techniques

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