熔融沉积法3D打印制备氧化锆陶瓷及其力学性能研究

在传统熔融沉积方法的基础上,采用颗粒混合料和螺杆挤出机构3D打印制备了致密和多孔氧化锆陶瓷,系统研究了颗粒原料的打印性能、坯体显微结构特征和陶瓷材料的力学性能。研究结果表明,该方法可以实现倾角达165°和跨度为5.5mm的无支撑结构的打印成型。研究了两种打印路径对致密氧化锆陶瓷抗弯强度及抗弯强度Weibull模数的影响,结果表明与传统单线填充模式相比,"单线+矩形"复合填充模式可以得到更高致密度和更优力学性能的陶瓷(抗弯强度达到637.8 MPa, Weibull模数达到9.10)。研究了不同气孔率多孔氧化锆陶瓷的压缩力学行为,结果表明陶瓷的抗压强度和气孔率之间存在复合指数规律,低气孔率时异面压缩的应力–应变曲线只呈现弹性阶段,高气孔率时出现弹性阶段和坍塌阶段,均未出现密实阶段。

3D Printed Zirconia Ceramics via Fused Deposit Modeling and Its Mechanical Properties

Dense and porous zirconia ceramics were 3 D printed with granular feedstock and screw extrusion mechanism on the basis of the traditional fused deposition method. The printability of granular feedstock, microstructure of the body and mechanical properties of ceramic materials were studied. The unsupported structure with maximum inclination 165° and span 5.5 mm were obtained. Effects of the two filling modes of printing on the flexural strength and Weibull modulus of the dense zirconia ceramics were compared. The results showed that the "single line+rectangle" filling mode was more conducive to achieve higher density and better mechanical properties than the traditional single line filling mode. Materials with bending strength of 637.8 MPa and Weibull modulus of 9.1 were obtained. The compressive behavior of porous zirconia ceramics prepared with different porosities were studied, showing an exponential law between compressive strength and porosity. There was only elasticity stage on the stress-strain curve for the samples with high porosity, while collapse stage may appear for the samples with low porosity. There was no collapse stage for both samples.