3D打印模具法制备磷酸三钙点阵支架工艺研究

Research on the Preparation of Tricalcium Phosphate Lattice Scaffolds by 3D Printing Mold Method

通过数字光处理(DLP)3D打印技术制备模具,并与凝胶注模成型工艺相结合,制备了固含量为60%的OP、QD两种形式的β-磷酸三钙(β-TCP)点阵结构支架。分析了两种点阵结构支架的物相、微观形貌、孔隙率、收缩率以及力学性能。实验结果表明:点阵结构支架在烧结之后没有发生物相变化,晶粒之间链接紧密。支架的孔隙直径为540~570μm;OP点阵结构支架的总孔隙率为65.06%,QD结构为64.18%;两种形式支架的收缩率接近,分别为15.25%和15.84%;OP结构支架的最大抗压强度6.95 MPa,QD结构支架为4.26 MPa。两种点阵结构支架力学性能都松质骨的抗压强度范围内。

The mold is prepared by digital light processing(DLP)3D printing technology with a combination with the gel injection molding process,theβ-Tricalcium phosphate(β-TCP)lattice scaffolds with a solid content of 60%of OP and QD have been prepared.The phase,micro morphology,porosity,shrinkage and mechanical properties of the two lattice structure scaffolds were analyzed.The experimental results showed that the lattice scaffolds had not changed after sintering,and the links between the grains were tight.The pore diameter of the scaffolds were 540~570μm,the total porosity of the OP lattice scaffolds was 65.06%,and the QD scaffolds was 64.18%.The strength of the OP scaffolds was 6.95 MPa,and the QD scaffolds was 4.26 MPa.The compressive strength of the lattice scaffolds were within the pressure range of the compressive strength of the bone.