| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Biomaterials for Biomedical Implants
|
| Presentation Title |
Functionally Gradient Nitinol Structure with Pure Titanium Layers and Hydroxyapatite Over-Coating for Orthopedic Implant Applications |
| Author(s) |
Jeongwoo Lee, S Akin, Julia Walsh, Martin Jun, Hyowon Lee, Yung C. Shin |
| On-Site Speaker (Planned) |
Yung C. Shin |
| Abstract Scope |
Functionally-gradient multi-layer coatings are developed on the Nitinol surface for orthopedic implant applications to eliminate potentially toxic Ni ion release and to improve biocompatibility. Using the direct-energy deposition technique, both the core Nitinol and titanium gradient layers are manufactured with high purity. The completely alloyed microstructure without defects provides superior bonding strength compared to other metal coating techniques that rely on particle-to-particle bonding. Additionally, hydroxyapatite was deposited on the outer surface of the gradient structure using the cold-spray technique to enhance biocompatibility without compromising high crystallinity. The resultant bonding strength of hydroxyapatite coating exceeded the minimum adhesion strength requirement by the ISO-13779 standard. The in-vitro test on Nickel ion release revealed that the Ni release rate from the entire gradient Nitinol structure is an order of magnitude smaller than commercial Nitinol orthodontic wires, thereby suggesting a promising potential of the novel Nitinol structure in orthopedic and other implantable applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Biomaterials, Surface Modification and Coatings |