To make the mechanical properties of 3D printed polyetheretherketone(PEEK)artificial bones better match with those of human bones
and to improve the bioactivity of PEEK materials
the parameters for printing PEEK/HA composites through fused deposition molding(FDM)are optimized using PEEK fiber with bioactivity enhanced by hydroxyapatite(HA). Orthogonal experiments are designed to study the effects of important factors such as filling direction
printing speed
layer thickness and printing temperature on the mechanical properties of the specimens. In the mechanical experiment
the strain field of the specimens is measured with the three-dimensional full-field strain measurement and analysis system
and the internal defects of the specimens are analyzed with micron X-ray three-dimensional imaging system to find out the influences of various factors on the mechanical properties of the specimens
so the optimized printing parameters are obtained. The biocompatibility of PEEK/HA material was tested by cell adhesion and proliferation experiment. The experimental results show that the factors rank in this order in terms of their influences on the tensile strength: printing speed
filling direction
delamination thickness
printing temperature
and the maximum tensile strength is 69.63 MPa; and rank in this order in terms of their influences on the bending strength: filling direction
printing speed
delamination thickness
printing temperature
and the maximum bending strength is 99.5 MPa. The PEEK/HA specimens printed with optimized parameters have equivalent mechanical properties of human cortical bone
and have good bioactivity.
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references
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