Abstract

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.

Meeting Name

22nd Annual International Solid Freeform Fabrication Symposium -- An Additive Manufacturing Conference (2011: Aug. 8-10, Austin, TX)

Department(s)

Mechanical and Aerospace Engineering

Second Department

Materials Science and Engineering

Research Center/Lab(s)

Intelligent Systems Center

Comments

This research was funded by the U.S. Navy under SBIR phase I award N00014-11-M- 0113 to Mo-Sci Corporation and by the Intelligent Systems Center at Missouri University of Science and Technology.

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

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type

text

Language(s)

English

Publication Date

10 Aug 2011

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