3D printing and gelcasting process of Ti-6Al-4V porous titanium bone
SHI Yong-liang1，GUO Zhi-meng2，LI Xiu-min1，QI Cui-fen1，YANG Xiao-cai1
（1. Department of Materials Engineering， Hebei College of Industry and Technology， Shijiazhuang 050091，China 2. Institute for Advanced Materials & Technology， University of Science and Technology Beijing， Beijing 100083， China）
Abstract：The method for preparing porous titanium human bone model by 3D scanning， 3D printing and turning?mode was studied. The porous titanium bone model with an original size deviation of 0.5 mm was prepared by water-based gelcasting and vacuum sintering using Ti-6Al-4V powder as raw material and polyvinyl alcohol as pore former. Phase composition， shrinkage ratio， strength， porosity and pore structure change in the process of drying and sintering were investigated. The results show that， the body shrinkage is uniform in the gelcasting and vacuum sintering process， the radial shrinkage rate and axial shrinkage rate is 16.11% and 16.04%， respectively. The optimum performance is obtained at 1 200 ℃ for 2 hours. Under these conditions， the porous Ti has uniform honeycomb structure， pore size of 100-350 μm， micropore size of less than 10 μm， total porosity of 70.56%， open porosity of 65.60%， compressive strength of 194 MPa， and bending strength of 105 MPa. The structure and performance can both meet the requirement of making human skeleton.
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2018, Vol. 28 
