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CC BY V4.0, Open Access
Thesis
COPPER-ADDED STAINLESS STEEL AND TITANIUM ALLOYS FOR BACTERIAL RESISTANCE IN BIOMEDICAL DEVICES
Washington State University
Master of Science (MS), Washington State University
05/2025
DOI:
https://doi.org/10.7273/000007432
Abstract
In response to the growing demand for advanced materials with inherent infection resistance, this research investigates the material properties of 316L stainless steel and Ti6Al4V (Ti64) alloys with copper addition, produced through laser-directed energy deposition additive manufacturing. This study focuses on three stainless steel compositions (316L, 316L-3Cu, and 316L-5Cu) and four titanium compositions (Ti64, Ti32-10Ta-3Cu, Ti32-10Ta-5Cu, and Ti32-10Ta-7Cu). Compressive strength measurements and Vickers hardness tests were conducted to assess mechanical properties, while microstructural characterization and X-ray diffraction analysis provided insights into the material’s physical properties. Copper showed minimal effect on strength and hardness in 316L but significantly increased mechanical properties of Ti-Ta-Cu alloys, increasing yield strength by 22% and hardness by 13% when compared to Ti64. This research extends beyond mechanical and physical properties by exploring the on-contact antibacterial efficacy against Staphylococcus aureus and Pseudomonas aeruginosa for up to 72 hours. Copper addition resulted in significant bacterial resistance against both strains, with 316L-Cu alloys displaying up to 88% efficacy against S. aureus and 97% against P. aeruginosa. In comparison, Ti-Ta-Cu alloys exhibited up to 98% and 93% at the maximum time points. The findings of this investigation have the potential to benefit biomedical devices, contributing to both the structural and biofunctional properties of materials.
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Details
- Title
- COPPER-ADDED STAINLESS STEEL AND TITANIUM ALLOYS FOR BACTERIAL RESISTANCE IN BIOMEDICAL DEVICES
- Creators
- Michael B. Myers
- Contributors
- Amit Bandyopadhyay (Chair)Susmita Bose (Committee Member)Arda Gozen (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- School of Mechanical and Materials Engineering
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 75
- Identifiers
- 99901220469901842
- Language
- English
- Resource Type
- Thesis