Preparation of PEKK powder and its application in selective laser sintering
Polyetherketoneketone(PEKK)powder for 3D printing was prepared via thermally induced phase sep-aration(TIPS).The obtained powder was characterized by differential scanning calorimetry(dsc),fourier infra-red spectroscopy(FTIR),scanning electron microscopy(SEM),laser diffraction particle sizing and other in-struments.PEKK powder prepared by TIPS method had desired flowability and high density.The mean particle size of powder was 49.1μm.The Angle of Repose(AOR)was 34.3°.The bulk density of powder increased from 0.2 g/cm3 to 0.34 g/cm3 by heat treatment in oven at 190℃for 3 hours.Double melting peaks of PEKK pow-der were observed by DSC,which resulted from the polycrystalline of PEKK.FTIR test demonstrated that PEKK powder produced by TIPS method has similar chemical structure as raw PEKK material.High quality single-lay-er film of PEKK was prepared by optimizing SLS processing parameters,e.g.laser powder and scanning speed.The maximum tensile strength of single layer was 7.3 MPa which can be obtained by using 5.6 W laser power and 1 172 mm/s scanning speed.However,the thermal degradation and surface damage of PEKK film occurred when laser energy input was too high.
万方数据
维普
