|About this Abstract
||Materials Science & Technology 2011
||Next Generation Biomaterials
||Low Temperature Sintering of Ti-6Al-4V for Orthopedic Implant Applications
||Kyle Crosby, Leon Shaw
|On-Site Speaker (Planned)
Titanium alloys are widely used in orthopedic implants due to their high strength to weight ratio and proven biological stability. However, coatings are often required to improve the bioactivity of Ti-based implants. Another approach to enhancing the bioactivity is to fabricate functionally graded Ti-6Al-4V (Ti)/hydroxyapatite (HA) implants, thus avoiding a sharp interface between the Ti core and HA coating. To fabricate such graded implants, the sintering temperature of Ti must be 1000°C or lower to prevent embrittlement of the Ti alloy. Here we investigate the creation of nanostructured Ti powders via high-energy ball milling, while preventing their oxidation in the subsequent powder pressing and sintering processes. It is found that methods for green body formation can affect the sintered density while the use of nanostructured Ti powder can reduce sintering temperature substantially. These results reveal that nanostructured Ti powders have great potential for achieving functionally graded Ti/HA orthopedic implants.