Particle size, binder content and the post-processing schedule are important parameters that affect the microstructure, and, hence, the mechanical properties of parts produced using the indirect selective laser sintering process. 13-93 bioactive glass, with mean particle sizes ranging from 10 μm to 44 μm, is mixed with different amounts of stearic acid binder to fabricate green scaffolds. Through the design of the post-processing schedule, the time required for postprocessing the green scaffolds is reduced from the initial 80 hrs to 12 hrs. The compressive strength varies from 41 MPa for a part with~60% porosity to 157 MPa for a part with no designed porosity. Several batches of 13-93 scaffolds are soaked in a simulated body fluid for different time intervals ranging from 1 week to 6 weeks. The amount of hydroxyapatite formed and subsequent mechanical properties are provided and discussed.
K. C. Kolan et al., "Effect of Particle Size, Binder Content and Heat Treatment on Mechanical Properties of 13-93 Bioactive Glass Scaffolds," Proceedings of the 22nd Annual International Solid Freeform Fabrication Symposium (2011, Austin, TX), pp. 523-535, University of Texas at Austin, Aug 2011.
22nd Annual International Solid Freeform Fabrication Symposium -- An Additive Manufacturing Conference (2011: Aug. 8-10, Austin, TX)
Mechanical and Aerospace Engineering
Materials Science and Engineering
Intelligent Systems Center
Keywords and Phrases
3D printers; Binders; Bioactive glass; Compressive strength; Laser heating; Manufacture; Mechanical properties; Particle size; Porosity; Binder content; Mean particle size; Post processing; Selective laser sintering; Simulated body fluids; Time interval; Scaffolds
Article - Conference proceedings
10 Aug 2011