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Wednesday, August 25, 2004
POST 1.10

Recent Developments in the Generation of Porous TiNi Foams as Biomedical Implant Materials

A. P. Jardine, Shape Change Technologies LLC, Thousand Oaks, CA

The use of porous Shape Memory Effect and Superelastic TiNi as an implant material is exciting, due to the innate actuation that is possessed by the material, and its potential capacity to adapt to changing structural morphologies. The most common manufacturing technique to date has been Self-Propagating High Temperature Synthesis (SHS), which allows for open celled porosities and relative densities of between 30 to 40% of the fully dense alloy. Although a very successful process, the use of Ti and Ni powders as feedstock necessarily adds both oxygen and nitrogen into the alloy, resulting in a poorer quality TiNi as compared to actuator grade material, currently used in stents and other biomedical devices. Undesirable embrittled regions, rough surface morphologies and extraneous phases may be present in SHS generated foams. In addition, the lack of morphological control of the microstructure impedes its implementation into products requiring mechanically less rigid, less dense foam structures. Shape Change Technologies has been working on manufacturing foams utilizing differing feed stocks and alternative methodologies to generate foams made from higher quality material. Results will be presented demonstrated improvements in the SHS process allowing for higher quality foams.