Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy

Biomedical grade of titanium alloys are prone to undergo degradation in body fluid environment. Surface coating such as Physical Vapor Deposition (PVD) can serve as one of the alternatives to minimize this issue. Past reports highlighted that coated PVD layer consists of pores, pin holes and columna...

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Main Author:	Abdullah, Arman Shah
Format:	Thesis
Language:	English
Published:	2015
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/54826/1/ArmanShahAbdullahPFKM2015.pdf
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id	my-utm-ep.54826
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spelling	my-utm-ep.548262020-11-08T06:58:03Z Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy 2015-10 Abdullah, Arman Shah TJ Mechanical engineering and machinery Biomedical grade of titanium alloys are prone to undergo degradation in body fluid environment. Surface coating such as Physical Vapor Deposition (PVD) can serve as one of the alternatives to minimize this issue. Past reports highlighted that coated PVD layer consists of pores, pin holes and columnar growth which act as channels for the aggressive medium to attack the substrate. Duplex and multilayer coatings seem able to address this issue at certain extent but at the expense of manufacturing time and cost. In the present work, the effect of ultrasonic vibration parameters on PVD-Titanium Nitride (TiN) coated Ti-13Zr-13Nb biomedical alloy was studied. Disk type samples were prepared and coated with TiN at various conditions: bias voltage (-125V), substrate temperature (100 to 300 ºC) and nitrogen gas flow rate (100 to 300 sccm). Ultrasonic vibration was then subsequently applied on extreme high and low conditions of TiN coated samples at two different frequencies (8 kHz, 16 kHz) and three set of exposure times (5 min, 8 min, 11 min). Encouraging results of PVD coating are observed on the samples coated at higher polarity of nitrogen gas flow rate (300 sccm) and substrate temperature (300 ºC) in terms of providing better surface morphology and roughness, coating thickness and adhesion strength. All TiN coated samples treated with ultrasonic vibration exhibit higher corrosion resistance than the untreated ones. Microstructure analysis under (Field Emission Scanning Electron Microscopy (FESEM) confirms that the higher ultrasonic frequency (16 kHz) and the longer exposure time (11 minutes) produce the most compact coating. It is believed that hammering effect from ultrasonic vibration reduces the micro channels’ size in the coating and thus decelerates the corrosion attack. Nano indentation test conducted on the ultrasonic treated samples provides a higher Hardness/Elasticity (H/E) ratio than untreated ones. This suggests that the ultrasonic vibration treated samples could also have a lower wear rate. 2015-10 Thesis http://eprints.utm.my/id/eprint/54826/ http://eprints.utm.my/id/eprint/54826/1/ArmanShahAbdullahPFKM2015.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:96008 phd doctoral Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Abdullah, Arman Shah Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy
description	Biomedical grade of titanium alloys are prone to undergo degradation in body fluid environment. Surface coating such as Physical Vapor Deposition (PVD) can serve as one of the alternatives to minimize this issue. Past reports highlighted that coated PVD layer consists of pores, pin holes and columnar growth which act as channels for the aggressive medium to attack the substrate. Duplex and multilayer coatings seem able to address this issue at certain extent but at the expense of manufacturing time and cost. In the present work, the effect of ultrasonic vibration parameters on PVD-Titanium Nitride (TiN) coated Ti-13Zr-13Nb biomedical alloy was studied. Disk type samples were prepared and coated with TiN at various conditions: bias voltage (-125V), substrate temperature (100 to 300 ºC) and nitrogen gas flow rate (100 to 300 sccm). Ultrasonic vibration was then subsequently applied on extreme high and low conditions of TiN coated samples at two different frequencies (8 kHz, 16 kHz) and three set of exposure times (5 min, 8 min, 11 min). Encouraging results of PVD coating are observed on the samples coated at higher polarity of nitrogen gas flow rate (300 sccm) and substrate temperature (300 ºC) in terms of providing better surface morphology and roughness, coating thickness and adhesion strength. All TiN coated samples treated with ultrasonic vibration exhibit higher corrosion resistance than the untreated ones. Microstructure analysis under (Field Emission Scanning Electron Microscopy (FESEM) confirms that the higher ultrasonic frequency (16 kHz) and the longer exposure time (11 minutes) produce the most compact coating. It is believed that hammering effect from ultrasonic vibration reduces the micro channels’ size in the coating and thus decelerates the corrosion attack. Nano indentation test conducted on the ultrasonic treated samples provides a higher Hardness/Elasticity (H/E) ratio than untreated ones. This suggests that the ultrasonic vibration treated samples could also have a lower wear rate.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abdullah, Arman Shah
author_facet	Abdullah, Arman Shah
author_sort	Abdullah, Arman Shah
title	Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy
title_short	Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy
title_full	Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy
title_fullStr	Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy
title_full_unstemmed	Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy
title_sort	influence of ultrasonic vibration on tin coated biomedical ti-13zr-13nb alloy
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2015
url	http://eprints.utm.my/id/eprint/54826/1/ArmanShahAbdullahPFKM2015.pdf
_version_	1747817736283619328

Influence of ultrasonic vibration on TiN coated biomedical TI-13Zr-13Nb alloy

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