立体光刻增材制造中固含量对Al2O3陶瓷性能的影响

doi:10.15541/jim20210636

无机材料学报 ›› 2022, Vol. 37 ›› Issue (3): 353-360.DOI: 10.15541/jim20210636

所属专题：增材制造专题(2022)

• 研究快报 • 上一篇

立体光刻增材制造中固含量对Al₂O₃陶瓷性能的影响

刘国仟¹(), 闫长海¹, 张可强², 金华³, 何汝杰²()

1.中国运载火箭技术研究院空间物理重点实验室, 北京 100076
2.北京理工大学先进结构技术研究院, 北京 100081
3.厦门大学航空航天学院, 厦门 361005

收稿日期:2021-10-17 修回日期:2021-11-09 出版日期:2022-03-20 网络出版日期:2021-12-24
通讯作者: 何汝杰, 副教授. E-mail: herujie@bit.edu.cn
作者简介:刘国仟(1980-), 男, 高级工程师. E-mail: 15201631565@163.com

Effect of Solid Loading on the Property of Al₂O₃ Ceramics in Stereolithographic Additive Manufacturing

LIU Guoqian¹(), YAN Changhai¹, ZHANG Keqiang², JIN Hua³, HE Rujie²()

1. Science and Technology on Space Physics Laboratory, China Academy of Launch Vehicle Technology, Beijing 100076, China
2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
3. School of Aerospace Engineering, Xiamen University, Xiamen, 361005, China

Received:2021-10-17 Revised:2021-11-09 Published:2022-03-20 Online:2021-12-24
Contact: HE Rujie, associate professor. E-mail: herujie@bit.edu.cn
About author:LIU Guoqian (1980-), male, senior engineer. E-mail: 15201631565@163.com
Supported by:
National Natural Science Foundation of China(51772028)

摘要/Abstract

摘要：

对于陶瓷立体光刻增材制造技术, 光敏树脂浆料的固含量发挥着重要的作用。本工作首先制备了不同固含量的Al₂O₃陶瓷浆料, 并采用立体光刻增材制造技术, 制备了Al₂O₃陶瓷, 并研究了Al₂O₃浆料的固含量与陶瓷性能的关联关系。其次, 探索了固含量对Al₂O₃浆料的流变行为、固化性能, 以及对Al₂O₃陶瓷的微观结构、力学性能的影响规律。结果表明, 随着固含量增加, 浆料的粘度和剪切应力均增大。在光固化增材制造过程中, 高固含量导致浆料的粘度高于其自流平的临界值, 且Al₂O₃浆料的固化性能与固含量高度相关。此外, 固含量明显影响光固化增材制造的Al₂O₃陶瓷的缺陷。这些制造缺陷对于Al₂O₃陶瓷的力学性能有重要影响。最后, 本工作总结了光敏Al₂O₃浆料的流变行为、固化性能与Al₂O₃陶瓷的微观结构和力学性能之间的关联关系。浆料的高粘度造成陶瓷的微观结构不均匀, 最终导致其力学强度较差。本研究结果可为陶瓷的光固化增材制造提供一定的参考。

关键词: Al₂O₃陶瓷, 固含量, 光固化, 增材制造

Abstract:

For ceramic stereolithographic (SL) additive manufacturing, the solid loading of ceramic photosensitive slurry plays an important role during the SL process. In this study, Al₂O₃ ceramics were fabricated by SL additive manufacturing from photosensitive Al₂O₃ slurries with various solid loadings, and the solid loading-property relationships of Al₂O₃ ceramic were performed. The effects of solid loading on not only the rheological behavior and curing property of the photosensitive Al₂O₃ slurry but also the microstructure and mechanical properties of the Al₂O₃ ceramic were investigated. The results showed that both the viscosity and shear stress increased with the increase of the solid loading. High viscosity was greater than the critical value for self-leveling during the SL process. The curing properties of photosensitive Al₂O₃ slurries were highly depended on the sold loading. Moreover, clear effects on the defect characteristics of Al₂O₃ ceramics manufactured from various photosensitive slurries were observed. These manufactured defects are critical for the mechanical behavior of Al₂O₃ ceramic. In addition, the relationship between rheological behavior and curing property of photosensitive Al₂O₃ slurry. Meanwhile, the resulting microstructure and mechanical properties of the Al₂O₃ ceramic were also illustrated. Inhomogeneous structure caused by high viscosity can lead to a sintered ceramic with poor strength. These findings provide fundamental understanding for SL additive manufacturing of ceramics.

Key words: Al₂O₃, solid loading, stereolithography, additive manufacturing

中图分类号:

TQ174

刘国仟, 闫长海, 张可强, 金华, 何汝杰. 立体光刻增材制造中固含量对Al₂O₃陶瓷性能的影响[J]. 无机材料学报, 2022, 37(3): 353-360.

LIU Guoqian, YAN Changhai, ZHANG Keqiang, JIN Hua, HE Rujie. Effect of Solid Loading on the Property of Al₂O₃ Ceramics in Stereolithographic Additive Manufacturing[J]. Journal of Inorganic Materials, 2022, 37(3): 353-360.

图/表 9

Fig. 1 (a, b) Schematic diagram of slicing model and (c, d) green bodies of rectangular bar and cylinder

Fig. 2 (a) Apparent viscosity and (b) shear stress vs shear rate curves of photosensitive Al2O3 slurries with different solid loadings (c) relative viscosity dependence on solid loading at the shear rate of 200 s-1

Table 1 Herschel-Bulkley model parameters of Al2O3 slurries

Solid loading /% (in volume)	τ₀/Pa	K	n	R²
45	1.24243	0.41855	0.99596	0.99825
50	1.43614	0.37397	1.09476	0.99871
55	1.77148	0.37481	1.14081	0.99883
60	2.26134	0.57750	1.25022	0.99975
65	3.97074	1.87845	1.22798	0.99992

Fig. 3 Curing thickness vs exposure time of Al2O3 slurries with different solid loadings

Fig. 4 Flexural strength and relative density of sintered Al2O3 ceramics varied with solid loading

Fig. 5 Fracture microstructures of sintered Al2O3 ceramics (a) A45; (b) A50; (c, d) A55; (e) A60; (f) A65

Fig. 6 (a) Curing thickness vs logarithm of input density of energy, (b) depth of penetration, critical density of energy and interparticle spacing vs solid loading for Al2O3 slurries

Fig. 7 X-CT reconstructed images of sintered Al2O3 ceramics (a) A45; (b) A50; (c) A55; (d) A60; (e) A65

Fig. 8 Linear shrinkage of the rectangular Al2O3 sintered ceramics in different directions

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立体光刻增材制造中固含量对Al₂O₃陶瓷性能的影响

Effect of Solid Loading on the Property of Al₂O₃ Ceramics in Stereolithographic Additive Manufacturing

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