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Plasma surface engineering and characterisation of biomedical stainless steels

Buhagiar, Joseph (2008)
Ph.D. thesis, University of Birmingham.

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Abstract

Low temperature plasma surface alloying with nitrogen (nitriding), carbon (carburising) and both (carbonitriding) has been successfully employed in hardening medical grade ASTM F138, ASTM F1586 and ASTM F2581 as well as engineering grade AISI 316 by the formation of a modified layer better known as S-phase or expanded austenite. In this study, systematic plasma treatments and characterisation were performed on medical grade stainless steel in order to establish the optimised treatment conditions, especially temperature, which can maximise the hardened case depth without any detriment in corrosion resistance. The surface of a biomaterial must not adversely affect its biological environment and return the material surface must not be adversely affected by the surrounding host tissue and fluids. Experimental results have shown that this duality of concern can be addressed by creating S-phase. It has been shown that low-temperature nitriding (430°C), carburising (500°C) and carbonitriding (430°C) improved the localised corrosion, corrosion-wear and fretting-wear resistance of these medical grade stainless. Also biocompatibility studies have proved that these hardened surfaces were biocompatible under the realms of the tests conducted in this study therefore the use of hardened medical grade austenitic stainless steel might be suitable in implant applications.

Type of Work:Ph.D. thesis.
Supervisor(s):Dong, Hanshan and Bell, Tom
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Keywords:biocompatibility; S-phase; Expanded austenite; Plasma nitriding; Plasma carburising; Plasma nitrocarburising; Corrosion-wear; Stainless steel; Pitting corrosion; Hardening; Crevice corrosion; Low Temperature Plasma; Carbo-Nitriding; Hybrid; Austenitic Stainless Steel; Corrosion; Wear-Corrosion; Medical Grade; ASTM F138; ASTM F1586; ASTM F2581; AISI 316; Ringer's Solution; surface engineering; biomedical; corrosion; Nickel free austenitic stainless steel; Medical austenitic stainless steel; Fretting-wear; Intergranular corrosion; Low temperature plasma alloying; Tribocorrosion; TEM; XTEM; tribology; Fretting wear; wear
Subjects:Q Science (General)
TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:3744
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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