Deformation study of ceramic mold with complex structure by dimensional measurement of Sn-Bi casting

4th International Conference on Applied Materials and Manufacturing Technology

材料科学;机械制造

Wang, Fei^1 ; Li, Fei^1 ; Han, Guoming^1 ; Sun, Baode^1,2 ; Li, Yulong^3

Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiaotong University, Shanghai

200240, China^1

State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai

200240, China^2

Department of Materials Science and Manufacturing Processes, AECC Commercial Aircraft Engine Co., LTD, Shanghai

200241, China^3

关键词: Complex structure;    Constrained structure;    Deformation studies;    Dimensional measurements;    Firing temperature;    Measurement methods;    Microscopic cracks;    Structure features;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/423/1/012177/pdf
DOI  :  10.1088/1757-899X/423/1/012177

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Sn-Bi alloy casting measurement method was used to measure the inner cavity dimensions of molds with unconstrained/constrained structure features. All the external diameters expand, and the inner diameter shrinks after the dewaxing process. As the expansion rate of the inner cavity with thinner thickness is more sensitive to the expansion value, the expansion rate decreases with the increase of the cavity thickness. Compared to the mold dimensions after dewaxing, all the diameters of the fired molds become greater. With the rise of firing temperature, the expansion rate of the mold diameters tends to decrease. The inner diameter has a much lower expansion rate than all the external diameter at a certain temperature. For the uneven radiation heat transfer of the furnace and the complex structure of the mold, the temperature field of the mold is unevenly distributed in firing process. Under the influence of constrained structure, microscopic cracks appear in mold to relieve the unsynchronized deformation, which will cause the expansion of the mold.