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Publication Detail
Mechanical strength of extrusion freeformed calcium phosphate filaments
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Yang HY, Chi XP, Yang S, Evans JRG
  • Publisher:
    SPRINGER
  • Publication date:
    05/2010
  • Pagination:
    1503, 1510
  • Journal:
    J MATER SCI-MATER M
  • Volume:
    21
  • Issue:
    5
  • Print ISSN:
    0957-4530
  • Language:
    EN
  • Keywords:
    RAPID PROTOTYPING TECHNIQUES, HARD-TISSUE SCAFFOLDS, POROUS HYDROXYAPATITE, FUSED DEPOSITION, CERAMICS, SUBSTITUTE, PART
  • Addresses:
    Evans, JRG
    UCL
    Dept Chem
    London
    WC1H 0AJ
    England
Abstract
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 1300A degrees C, had radii from 115 to 135 mu m 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 1250A degrees C. Multiple layer lattice structures were created and tested in compression.
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