《China Foundry》
Title:Fabrication of silica-based ceramic cores with internal lattice structures by stereolithography
Author:Ke-hui Hu1, 2, Hao-yuan Wang1, 2, Kuan Lu3, Qian Feng1, 2, Dao-ding Yang4, Jian Cao4, Bo Zhang4, *Zhi-gang Lü1, 2, 5, and **Xing Ran2, 4
Address: 1. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China; 2. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; 3. Ten Dimensions (Guangdong) Technology Co., Ltd., Foshan 528225, Guangdong, China; 4. Guizhou Anji Aviation Investment Casting Co., Ltd., Anshun 561003, Guizhou, China; 5. Key Laboratory of Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China
Key words:silica; ceramic cores; stereolithography; lattice structure; investment casting
CLC Nmuber:TG221
Document Code:A
Article ID:1672-6421(2022)05-369-11
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.