Abstract
In this study, nano-hydroxypatite (n-HAP) bone scaffolds are prepared by a homemadeselective laser sintering (SLS) system based on rapid prototyping (RP) technology. TheSLS system consists of a precise three-axis motion platform and a laser with itsoptical focusing device. The implementation of arbitrary complex movementsbased on the non-uniform rational B-Spline (NURBS) theory is realized in thissystem. The effects of the sintering processing parameters on the microstructureof n-HAP are tested with x-ray diffraction (XRD), Fourier transform infrared(FTIR) spectroscopy and scanning electron microscopy (SEM). The particles ofn-HAP grow gradually and tend to become spherical-like from the initial needle-likeshape, but still maintain a nanoscale structure at scanning speeds between 200 and300 mm min − 1 when the laser power is 50 W, the light spot diameter 4 mm, and the layer thickness 0.3 mm.In addition, these changes do not result in decomposition of the n-HAP during thesintering process. The results suggest that the newly developed n-HAP scaffoldshave the potential to serve as an excellent substrate in bone tissue engineering.
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