A strategy for defects healing in 3D printed ceramic compact via cold isostatic pressing: Sintering kinetic window and microstructure evolution
A strategy for defects healing in 3D printed ceramic compact via cold isostatic pressing: Sintering kinetic window and microstructure evolution
复制标题
通过 CIP 修复 3D 打印陶瓷复合体缺陷的策略：烧结动力学窗口和微观结构演化
DOI：
10.1111/jace.16269
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发表时间：
2019-05-01
影响因子：
3.9
通讯作者：
He, Rongxuan
中科院分区：
文献类型：
--
作者：
An, Di;Liu, Wei;He, Rongxuan
在本研究中，我们开发了一种独特的3D打印陶瓷压块的缺陷修复方法，通过冷等静压（CIP）在去胶后进行修复，并对3D打印氧化锆压块的层间界面缺陷的典型特征进行了表征，发现其明显减少。系统地研究了愈合后烧结体的特征烧结动力学窗口和微观结构演变，发现其与传统的成形方法有很大的不同。对三个烧结阶段的特征微观结构细节进行了探讨，如烧结初期表面机械平坦，中期层间界面区微观结构不均匀且孔隙率高，最后阶段微波纹状结构特征并伴有层间缺陷愈合。追踪愈合后3D打印体孔隙结构的演变，并测量杨氏模量、硬度和断裂韧性等力学性能，以了解愈合效果的重要性。
In this study, we developed a unique defect healing method for 3D printed ceramic compact via cold isostatic pressing (CIP) after debinding, and typical features of interlayer interface defects of 3D-printed zirconia compact were characterized and found to be reduced significantly. The characteristic sintering kinetics window and microstructure evolution of the healed sintered bodies were systematically investigated, which was found to be quite different from conventional shaping methods. The three sintering stages are probed by their feature microstructure details such as the mechanically flattening surface at the early sintering stage, the heterogeneous microstructure and high porosity in the interlayer interface region at the middle stage, and the slightly ripple-like structural features combined with the healed interlayer defects at the final stage. The evolution of the pore structure of the healed 3D printed bodies were traced and the mechanical properties such as the Young's modulus, hardness, and fracture toughness were measured to understand the significance of the heal effect.