HOU Yuxuan 1, LI Yan 1, LU Bingheng 2, 4, HOU Ruikai 3，LI Yanxia 5, SONG Suocheng 3, 4
(1. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, Shaanxi, China; 2. School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China; 3. Materials Innovation Design Center, School of Materials, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China; 4. National Additive Manufacturing Innovation Center, Xi'an 710117, Shaanxi, China; 5. Beijing Remote Sensing Equipment Research Institute, Beijing 100854, China)
Abstract: Due to the high light transmittance of fused silica, there is a serious over curing phenomenon in the process of light curing of ceramic slurry. In order to eliminate this over curing and improve the molding accuracy and performance, it is necessary to prepare fused silica ceramic slurry with high absorbance and low viscosity. The viscosity of slurry is improved by modifying fused silica powder and adjusting the content of dispersant BYK-9076. Meanwhile, B4C particles with high strength, high UV light absorption and ability to inhibit the high-temperature crystallization of fused silica are added to realize the comprehensive optimization of fused silica ceramic slurry. It is indicated that, with 4 wt.% dispersant, viscosity of the slurry was reduced by 93%, leading to low viscosity fused silica ceramic slurry with a solid content of 57 vol.%. When the B4C content is 2.5 wt.% and the exposure time is 5 s, the curing depth increases from 1325 μm to 230 μm. In this case, the cured film has the optimal accuracy in the X and Y directions, both of which are 0.01 mm.
Key words: fused silica; stereolithography; overcure; rheological properties; boron carbide