Investigation of a novel SLM-BMG for knee implants

The project will investigate novel Selective Laser Melted Bulk Metallic Glass alloys for knee implants. The motivation behind this research stems from the high prevalence of knee-related issues, such as arthritis and injuries, which often require total joint replacements. The research will directly address the limitations of existing implant materials by exploring the use of advanced materials known as Bulk Metallic Glasses (BMGs) and their composites for knee implants. BMGs offer unique properties such as high strength, elasticity, corrosion resistance, and biocompatibility, making them attractive for biomedical applications. However, there are challenges associated with the development of Zr-based BMGs specifically for knee implants, including size limitations, brittle behaviour, and long-term biosafety concerns. The proposed research aims to overcome these challenges through various approaches, including the addition of suitable elements, partial crystallization of amorphous materials, and the use of new manufacturing techniques like Selective Laser Melting (SLM). The scientific objectives of this proposal are to assess the fabrication of metallic glass knee implants using SLM, investigate their mechanical properties, corrosion, and tribocorrosion behaviour, and evaluate their potential as durable and cost-effective load-bearing implants. The research also focuses on developing Ni-free Zr-Nb-Al-Ti-(Cu/Ag) and Zr-Nb-Al-Fe-(Cu/Ag) metallic glasses with enhanced biocompatibility and wear resistance, aiming to reduce revision surgeries. The proposed methodology involves selecting suitable alloy systems, producing amorphous powders through gas atomization, performing SLM experiments to fabricate BMGs, and characterizing the samples using various techniques such as X-ray diffraction, electron microscopy, and thermal analysis. The biocompatibility, corrosion resistance, wear resistance, and mechanical behaviour of the fabricated BMGs will be extensively studied. This methodology is based on the existing knowledge in biomaterials and additive manufacturing and is expected to contribute to the development of high-quality metal glass knee implants. Overall, this research proposal aims to address the limitations of current knee implants by exploring the use of novel Selective Laser Melted Bulk Metallic Glasses. The findings from this study have the potential to significantly improve the quality and longevity of knee implants, benefiting millions of people suffering from knee-related issues worldwide.