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.
[1] 王燎, 戴尅戎. 骨科个体化治疗与3D打印技术[J].医用生物力学,2014,29(3): 256-260[2] 罗丽娟, 余森, 于振涛, 等. 3D打印钛及钛合金医疗器械的优势及临床应用现状[J]. 生物骨科材料与临床研究, 2015,12(6):72-75[3] Peter H, Lenka M, Carolin K, et al. Cellular Ti-6Al-4V structures with interconnected macro porosity for bone implants fabricated by selective electron beam melting[J].Acta Biomaterialia, 2008, 4(5): 1536-1544[4] Leuders S, Thone M, Riemer A, et al. On the mechanical behavior of titanium alloy TiAl6V4 manufactured by selective laser melting: Fatigue resistance and crack growth performance[J]. International Journal of Fatigue, 2013, 48(6): 300-307.[5]Che ZG, Yang J, Tang N,et al.Research on laser peening of TC21 titanium alloy with high energy laser[J].Rare Metal Materials and Engineering,2014, 43(12):2962-2965.[6] Murr L E, Martinez E, Amato K N, et al. Fabrication of Metal and Alloy Components by Additive Manufacturing: Examples of 3D Materials Science[J]. Journal of Materials Research and Technology, 2012, 1(1): 42-54[7] 王栋, 陈岁元, 魏明炜, 等. 激光3D打印用TC21钛合金粉末制备及其成形性研究[J]. 热加工工艺, 2016, 45(22):1-6[8] 陆亮亮,张少明,徐骏,等. 球形钛粉先进制备技术研究进展[J]. 稀有金属,2017, 41(1):94-101[9] 肖健, 邱贵宝, 廖益龙, 等. 尿素作为造孔剂制备泡沫钛的结构和力学性能[J]. 稀有金属材料与工程,2015,44(7):1725-1729.[10] 杨栋华, 邵慧萍, 樊联鹏, 等. 凝胶注模成形多孔Ti-7.5Mo合金的孔隙及力学性能[J].北京科技大学学报,2011,22(9):1122-1126