Process and performance study of Ti6AI4V titanium alloy porous scaffolds by direct writing 3D printing
In this paper,a novel hot-melt-quick-frozen polyvinyl alcohol(PVA)hydrogel was developed,which can be used as a binder for slurry direct 3D printing of Ti6Al4V titanium alloy porous scaffolds.The titanium al-loy slurry was obtained by mixing the hot-melt-quick-freezing PVA hydrogel binder with titanium alloy powder,and the titanium alloy porous scaffold blanks were prepared by direct 3D printing,and then the titanium alloy porous scaffolds were prepared by high-temperature sintering to form the titanium alloy porous scaffold sintered bodies.The rheological properties of the titanium alloy slurry were analyzed by rotational rheometer,the micro-structure of the titanium alloy porous stent blanks and sintered bodies were observed by scanning electron micro-scope,and the mechanical properties of the titanium alloy porous stent blanks and sintered bodies were exam-ined by electronic universal testing machine.The results show that the Ti6Al4V titanium alloy slurry in hot-melt-frozen PVA hydrogel system has the characteristic of"shear thinning",and has the optimal printing effect when the volume fraction of solid phase is 70％.Using the slurry direct writing 3D printing can be prepared titanium alloy porous scaffold blanks,printing fiber microporous structure and flocculent PVA.The mechanical properties of 1 200 ℃ high-temperature sintering titanium alloy porous scaffolds sintered body matches with the human cancellous bone.The microstructure of the sintered body shows a porous structure with microporous size less than 10 μm and a porosity of 62.37％.
direct writing 3D printingTi6Al4V titanium alloyPVA hydrogeltitanium alloy porous scaffoldporous structure
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