In this decade, metallic materials have been rapidly developed for the biomedical purpose after the discovery of good biocompatibility on the Ti metal. The most popular applications of the Ti alloys (e.g. pure (cp) Ti, Ti-6Al-4V and Ti-6Al-7Nb) as biomedical implant materials is in the field of trauma and orthopedic surgery. Recently, several novel Ti-based metallic glasses (Ti-MGs) with superior biomedical properties compared to its crystalline material counterpart has also been developed. These Ti-MGs have no crystal structural defects (such as dislocations, grain boundaries or twins), homogenous chemical composition, higher strength, lower Young’s modulus, and much better corrosion resistance. Although the Ti-MGs present better biomedical properties than the crystalline Ti alloys. However, based on the long-term durability and health concerns, two serious problems still exist in the above-mentioned two kinds of Ti-based materials. The problems are (1) The mismatch of the Young’s modulus (E) between the bone (E=10~30 GPa for cortical bone) and the implant (E=110~120 GPa for Ti-6Al-4V alloys, 80~90 GPa for Ti-MG). Large modulus mismatch will cause stress-shielding on the bone nearby the implant and induced tissue loss and increasing recovery time. (2) The release of toxic metallic ions and/or particles through corrosion and wear processes. Some harmful elements are frequently added in the Ti alloy systems in order to improve mechanical properties and glass-form ability (GFA) (Al, V for Ti-6Al-4V alloys, Ni, Cu for Ti-MG). Accordingly, in this study, we are going to select the non-toxic Ti-based metallic glass (Ti42Zr35Ta3Si5Co12.5Sn2.5) which was invented and got patent from our previous study) as the based alloy to prepare the metallic glass powder. Then, these metallic glass powder can be fabricated into a gradient porosity metallic glass foam via thermoplastic forming process with spacer method for application on the biomedical implant. In the 1st year, In the 2nd year, the major work will focus on the process study of MG powder manufacturing and thermoplastic forming. The microstructure changes of hot-pressed Ti-based bulk metallic glass foam (BMG) will be investigated and working window of thermoplastic forming process will be established. For the 2nd year, based on the experimental results of 1st year study on the thermoplastic forming process. The effect of different spacer materials on the hot-pressing process for fabricating the uni-porosity bulk metallic glass foam (BMGF) with different porosity ratio (30~60 vol.%) will be systematic investigated. The optimum spacer material and working window of hot-pressing process will be figured out. The 3rd year, the experimental results of 2nd year study on the selection of optimum spacer material and working window of hot-compressing process for fabricating the uni-porosity metallic glass foam will be applied on the structure design of gradient porosity and the investigation of working window for producing the gradient porosity bulk metallic glass foam. Hopefully, the Ti-based BMGFs could be applied into the biomedical implant in the future.
|Effective start/end date||1/08/20 → 31/07/21|
UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):
- Metallic glass
- Young’s modulus
- thermoplastic forming
- bulk metallic glass foam
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