Freeform Extrusion Fabrication of Titanium Fiber Reinforced Bioactive Glass Scaffolds

dc.creatorThomas, Albin
dc.creatorKolan, Krishna C.R.
dc.creatorLeu, Ming C.
dc.creatorHilmas, Gregory E.
dc.description.abstractAlthough implants made with bioactive glass have shown promising results for bone repair, their application in repairing load-bearing long bones is limited due to their low fracture toughness and fairly fast degradation response in vivo. In this paper, we describe our investigation of freeform extrusion fabrication of silicate based 13-93 bioactive glass scaffolds reinforced with titanium fibers. A composite paste was prepared with 13-93 bioactive glass filled with titanium fibers (~16 µm in diameter and aspect ratio of ~250) having a volume fraction of 0.4 vol. %. This paste was then extruded to fabricate scaffolds with an extrudate diameter of about ~0.8 mm. The sintered scaffolds, with and without titanium fibers, had measured pore sizes ranging from 400 to 800 µm and a porosity of ~50%. Scaffolds produced with 0.4 vol. % titanium fibers were measured to have a fracture toughness of ~0.8 MPa•m1/2 and a flexural strength of ~15 MPa. Bioactive glass scaffolds without titanium fibers had a toughness of ~ 0.5 MPa•m1/2 and strength of ~10 MPa. The addition of titanium fibers increased the fracture toughness of the scaffolds by ~70% and flexural strength by ~40%. The scaffolds’ biocompatibility and their degradation in mechanical properties, in vitro were assessed by immersing the scaffolds in a simulated body fluid over a period of one to four weeks.en_US
dc.description.departmentMechanical Engineeringen_US
dc.publisherUniversity of Texas at Austinen_US
dc.relation.ispartof2015 International Solid Freeform Fabrication Symposiumen_US
dc.subjectfreeform extrusion fabricationen_US
dc.subjectbioactive glass scaffoldsen_US
dc.subjecttitanium fibersen_US
dc.subjectfiber reinforcementen_US
dc.titleFreeform Extrusion Fabrication of Titanium Fiber Reinforced Bioactive Glass Scaffoldsen_US
dc.typeConference paperen_US

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