Thesis
Improving wear resistance and bioactivity of Ti64 alloy for biomedical applications
Washington State University
Master of Science (MS), Washington State University
2017
Handle:
https://hdl.handle.net/2376/101431
Abstract
Titanium and its alloys, specifically Ti-6Al-4V (Ti64), have become a common material of choice for biomedical applications. From its use in the dental industry to the complete replacement of hip and knee joints, Ti64 has become a popular material choice for its excellent specific strength, resistance to corrosion, superior biocompatibility, and resistance to fatigue deformation. However, Ti64 still possess a few weaknesses that limits its full potential for use in biomedical devices. Mainly, Ti64 is a soft metal with poor wear resistance. Secondly, although biocompatible, Ti64 is also a bioinert material i.e., for bone replacement applications, Ti64 will not establish strong osseointegration and will rather develop fibrous tissue in the local environment, isolating the implant, reducing the implants efficacy and lifespan. Two studies have been conducted in seeking to improve said weaknesses of the Ti64 alloy and are distinguished by Chapters II and Chapters III in this document. Chapter II focuses on a novel method for improving the wear resistance of Ti64 by using laser-based additive manufacturing - specifically LENS™ - to deposit Ti64 coatings with simultaneous additions of carbon nanotubes (CNTs) and calcium phosphate (CaP). Results show in situ carbide formation resulting in increased surface hardness and improved wear resistance, where addition of CaP allows for preferential formation of protective tribofilms, noted by reduced ion-release concentrations, lower coefficient of friction and reduced wear rates. Chapter III addresses improving the wear resistance of Ti64 but also focuses on improving the bioactivity by depositing dense and porous composite structures of Ti64 and CaP using LENS™. Results show increased surface hardness and tribofilm formation both equating to significantly improved wear resistance while porous samples show higher shear modulus values signifying improvements to early stage osseointegration.
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Details
- Title
- Improving wear resistance and bioactivity of Ti64 alloy for biomedical applications
- Creators
- Kevin Lee Stenberg
- Contributors
- Amit Bandyopadhyay (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525274201842
- Language
- English
- Resource Type
- Thesis