随着科技的发展,功能梯度材料能够更好地满足实际应用的需求,例如梯度掺杂结构的激光陶瓷能够很好的缓解热效应。然而,通过传统方法制备梯度结构材料通常是困难的。3D打印具有成型复杂构型的能力,可以很好地适应于功能梯度材料制备。本文提出了一种基于直书写3D打印激光陶瓷的主动混合打印头,并选用了纯YAG和025 at Yb∶YAG陶瓷浆料来验证该混料喷头的混合性能。首先,探究了两种浆料的流变性能。然后,采用Ansys Fluent软件对混合过程进行了计算机流体力学(CFD)仿真,探究了混合转速对混合均匀性的影响。此外,通过扫描电镜(SEM)结合能谱(EDS)面扫描检测了不同混合转速下混料喷头挤出线条截面上Yb元素的分布,并将实验结果与数值模拟结果进行了比较,验证了模拟的正确性。最后,将该混料喷头与直书写装备相结合,成功制备了梯度掺杂Yb∶YAG激光陶瓷。总之,混料直书写打印为制备梯度掺杂Yb∶YAG激光陶瓷提供了更多可能性。
As technology improves by leaps and bounds,functionally gradient materials can better meet the needs of practical applications,such as laser ceramics with gradient doping can well alleviate the thermal effects.However,it is often difficult to prepare gradient structural materials by traditional methods.3D printing has the ability to form complex structures and can be well adapted to the preparation of functionally gradient materials.In this paper,an active mixing printhead based on direct ink writing for 3D printing laser ceramics is proposed,and pure YAG and 0.25 at% Yb:YAG slurries are selected to verify the mixing performance of the printhead.Firstly,the rheological properties of the two slurries are investigated.Then,the mixing process is simulated by computer fluid dynamics (CFD)using Ansys Fluent software to explore the effect of mixing speed on mixing uniformity.In addition,the distribution of Yb elements on the extrusion lines section of the printhead at different mixing speeds are detected by SEM andEDS mapping and theexperimental results are compared with the numerical simulation results to verify the correctness of the simulations.Finally,the gradient doped Yb:YAG laser ceramics are successfully fabricated by combining the printhead with a direct ink writing device.In conclusion,direct ink writing with active mixing provides more possibilities for gradient doped Yb:YAG laser ceramics fabrication.
XIE Meng-meng, JI Hao-hao, DENG Jia-jie, WANG Hao-ran, ZHANG Jian, LIU Yu, CHEN Nian-jiang, LIANG Xing-bo. Research on the active mixing printhead for 3Dprinting gradient doped laser ceramics[J]. LASER & INFRARED,2023,53(11):1665~1670