Fabrication of ceramic cores via layered extrusion forming using graphite as pore-forming agent

4th International Conference on Applied Materials and Manufacturing Technology

材料科学;机械制造

Tang, Shiyan^1 ; Yang, Li^1 ; Li, Guanjin^1 ; Liu, Xinwang^1 ; Fan, Zitian^1

Huazhong University of Science, Technology State Key Laboratory of Materials Processing and Die and Mould Technology, Wuhan, Hubei, China^1

关键词: Alumina loading;    Comprehensive performance;    Extrusion forming;    Pore-forming agents;    Rheological behaviour;    Shape retention;    Sintered specimen;    Sintering process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/423/1/012065/pdf
DOI  :  10.1088/1757-899X/423/1/012065

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Graphite powders were introduced in aqueous alumina paste to prepare alumina cores with high porosity using layered extrusion forming, which was a type of additive manufacturing methods. Rheological behaviours of pastes with different solid loading were tested. Paste composed of 50vol.% alumina loading and 5g graphite powders generated specimens with highest shape retention and finest surface quality. During formation and sintering process, basic shapes of rectangular specimens could be well maintained. With the increase of graphite addition, open porosity increased and flexural strength decreased of sintered specimens. Specimens prepared from paste with 50vol.% alumina loading and 10g graphite powders possessed best comprehensive performance, which was promising for application in alloys casting.