Additive manufacturing of Al2O3 ceramic core with applicable microstructure and mechanical properties via digital light processing of high solid loading slurry |
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| Affiliation: | 1. Key Laboratory of Space Manufacturing Technology (SMT), Technology and Engineering Centre of Space Utilization, Chinese Academy of Sciences, Beijing, 100094, PR China;2. University of Chinese Academy of Sciences, Beijing, 100049, PR China;1. State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan, 030051, China;2. Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan, 030051, China;3. Key Laboratory of Instrumentation Science and Dynamic Measurement, Ministry of Education, North University of China, Taiyuan, 030051, China;4. The 48th Research Institute of China Electronics Technology Group Corporation, Changsha, 410002, China;1. Instituto de Física y Matemáticas, Universidad Tecnológica de la Mixteca, Carretera a Acatlima Km. 2.5, CP 69000, Huajuapan de León, Oaxaca, Mexico;2. Benemérita Universidad Autónoma de Puebla, Postgrado en Física Aplicada, Facultad de Ciencias Físico-Matemáticas, Av. San Claudio y Av. 18 sur, Col. San Manuel Ciudad Universitaria, Puebla, Pue, C. P. 72570, Mexico;3. Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Física, CDMX, 09340, Mexico;1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China;2. National Center for International Research of Clean Metallurgy, Central South University, Changsha, 410083, China;3. Guangdong Guangqing Metal Technology Co. Ltd., Yangjiang, Guangdong, 529500, China |
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| Abstract: | Ceramic cores are essential intermediate mediums in casting superalloy hollow turbine blades. The developing of additive manufacturing (AM) technology provides a new approach for the preparation of ceramic cores with complex structure. In this study, alumina oxide (Al2O3) ceramic cores with fine complex geometric shapes were fabricated by digital light processing (DLP) in high resolution. The maximum solid content of 70 vol% of ceramic slurry was adopted in the printing process, which is important for the regulation of deformations and mechanical properties. The effects of the printing parameters, including exposure intensity, printing layer thickness and sintering temperature on the microstructures and mechanical properties of printed samples were investigated. The decrease of residual stress and similar shrinkage in X, Y, and Z directions could be obtained by adjusting the printing parameters, which are crucial to prepare complex ceramic cores with high quality. Besides, the flexure strength and open porosity of ceramic cores reached 34.84 MPa and 26.94%, respectively, which were supposed to meet the requirement of ceramic cores for the fabrication of superalloy blades. |
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| Keywords: | High solid loading DLP Layer thickness Low shrinkage |
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