重力对 3D 打印粉末部件烧结的影响,Journal of the American Ceramic Society

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重力对 3D 打印粉末部件烧结的影响
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2021-07-28 , DOI: 10.1111/jace.18056
E. Torresani ₁ , R. M. German ₁ , R. Huff ₂ , E. A. Olevsky ₁

Affiliation

当前复杂形状粉末组件的增材制造技术（如粘合剂喷射、立体光刻、机器人铸造等）需要对应用于高孔隙度 3D 打印产品的烧结进行微调。低密度、复杂形状的致密化需要控制与重力相关的现象，以确保几乎完全和无变形的致密化。本研究通过参与全面的有限元模拟、确定增材制造的粉末试样的烧结行为以及对描述 3D 打印物体烧结的开发模型进行实验验证来解决这些问题。该论文描述了基于连续介质力学建模的数值方法的应用，该方法对 3D 打印粉末部件烧结过程中的重力引起的变形进行了建模。该模型的验证是通过与使用陶瓷立体光刻技术印刷的梁形元件烧结获得的实验结果进行比较来进行的。推导出了一个实用的半解析标准，可用于烧结 3D 打印零件的适用于各种材料系统的设计建议。基于获得的设计标准，开发了一个设计图，指示允许的 3D 打印元素的配置，从而避免过度的重力引起的形状扭曲。该模型的验证是通过与使用陶瓷立体光刻技术印刷的梁形元件烧结获得的实验结果进行比较来进行的。推导出了一个实用的半解析标准，可用于烧结 3D 打印零件的适用于各种材料系统的设计建议。基于获得的设计标准，开发了一个设计图，指示允许的 3D 打印元素的配置，从而避免过度的重力引起的形状扭曲。该模型的验证是通过与使用陶瓷立体光刻技术印刷的梁形元件烧结获得的实验结果进行比较来进行的。推导出了一个实用的半分析标准，可用于烧结 3D 打印零件的适用于各种材料系统的设计建议。基于获得的设计标准，开发了一个设计图，指示允许的 3D 打印元素的配置，从而避免过度的重力引起的形状扭曲。

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Influence of gravity on sintering of 3D-printed powder components

Present technologies of additive manufacturing (such as binder-jetting, stereolithography, robocasting, etc.) of complex-shape powder-components necessitate fine-tuning of sintering as applied to highly porous 3D-printing products. The densification of low-density, complex shapes requires control of the gravity-related phenomena to ensure a nearly full and distortion-free densification. The present study addresses these issues through the involvement of comprehensive finite element simulations, the determination of the additively manufactured powder specimens’ sintering behavior, and the experimental validation of the developed models describing sintering of 3D-printed objects. The paper describes the application of a numerical approach based on continuum mechanics-based modeling of the gravity-induced distortions during sintering of 3D-printed powder components. The validation of the model is conducted through the comparison with the experimental results obtained for the sintering of the beam-shape components printed using ceramic stereolithography technology. A practical semi-analytical criterion, which can be used for sintered 3D-printed parts’ design recommendations applicable to various material systems, is derived. Based on the obtained design criterion, a design map is developed indicating the allowable 3D-printed elements’ configurations enabling the avoidance of the excessive gravity-induced shape distortions.

更新日期：2021-07-28

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