| Photosensitive Al2O3 slurry with high solid content and low viscosity |
| Xu Zhang1, Jingde Zhang1,2, Yuhang Tian1, Shikang Xiao1, Jianzhang Li3, Guifang Han1 |
1Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China
2Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250100, China
3National Engineering Research Centre of Ceramic Matrix Composite Manufacture Technology, Xi’an Golden Mountain Ceramic Composites Co., Ltd. , Xi’an 710118, China |
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Received: October 22, 2022; Revised: January 10, 2023 Accepted: January 24, 2023. Published online: February 16, 2023. |
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| ABSTRACT |
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Slurries with high solid content and low viscosity are highly necessary to lower the sintering shrinkage and avoid possible defects for ceramic components fabricated by vat photopolymerization technique. However, the viscosity of slurry dramatically arises with the increase of solid content, which severely affects the printing process and the quality of preformance. To solve this issue, a novel combined strategy of powder surface modification and selection of dispersant was proposed to significantly increase the solid load without too much increase in viscosity. The surface of Al2O3 particles was modified by Silane A174 to improve its wettability with resins, and then the use of KOS 110 formed steric hindrance between particles achieving good dispersion. The synergistic effect of the modifier and dispersant was realized. Al2O3 slurry with a high solid loading up to 65 vol% and low viscosity of 20.0 Pa·s at 30 s−1 was prepared for stereolithography-based DLP 3D printing, which had among the highest performance in photosensitive Al2O3 slurries. |
| Key words:
Photosensitive ceramic slurry · Low viscosity · High solid content · Synergistic effect |
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