Mechanical strength of extrusion freeformed calcium phosphate filaments
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- Yang, H.Y., Chi, X.P., Yang, S. et al. J Mater Sci: Mater Med (2010) 21: 1503. doi:10.1007/s10856-010-4009-5
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Hydroxyapatite–tricalcium phosphate mixtures of various compositions were extruded by a solid freeforming process to form lattice structures to serve as hard tissue scaffolds. The unwelded filaments, sintered at temperatures from 1100 to 1300°C, had radii from 115 to 135 μm and were tested in three point flexural loading using a purpose-built fixture. Flexural strength ranged from 20 to 100 MPa depending on composition and sintering temperature. Weibull moduli up to 13 were obtained. Compositions with 50% or more tri-calcium phosphate did not develop strengths much above 40 MPa and the strength of most compositions fell when the sintering temperature exceeded 1250°C. Multiple layer lattice structures were created and tested in compression.