A key paper of latest issue (Vol.19 No.5) of CHINA FOUNDRY
Time：2022-11-27 Hits：883
Title: Fabrication of silica-based ceramic cores with internal lattice structures by stereolithography
DOI: https://doi.org/10.1007//s41230-022-2048-4
Author: Ke-hui Hu, Hao-yuan Wang, Kuan Lu, Qian Feng, Dao-ding Yang, Jian Cao, Bo Zhang, *Zhi-gang Lü, and **Xing Ran
*Zhi-gang Lü: Born in 1972, Ph.D, Professor. His research interests mainly focus on investment casting and additive manufacturing of ceramic materials.
E-mail: lvzg@tsinghua.edu.cn
**Xing Ran:
E-mail: ranxing257@163.com
Abstract: Ceramic cores are widely used in investment casting, and ideal properties of cores are essential for high-quality castings. Under the circumstances requiring thick cores, solid cores are likely to encounter deformation and cracking defects due to the accumulation of shrinkage. Therefore, with the superiority of ceramic stereolithography in producing complex ceramic parts, hollow cores with lattice structures were designed and fabricated. The dimensional accuracy and properties of the green and sintered bodies were evaluated. Results show the dimensional accuracy of sintered cores is controlled within ±0.25 mm benefited from the precise green bodies. The mechanical properties are not obviously deteriorated. The bending strength reaches 11.94 MPa at room temperature and 12.87 MPa at 1,500 °C with a creep deformation of 0.345 mm. Furthermore, casting verifications prove that the hollow cores meet the requirements of investment casting. Smooth casting surfaces are obtained, at the same time, the core-removal efficiency is improved by over 3 times.
If you'd like to learn more, please get it free at the following website: https://www.springer.com/journal/41230 or http://www.foundryworld.com/en/indexzhong.php/zazhishe/chinaguokan/type/3