The contribution of graphite powder to water-soluble cores in investment casting

作者：Zhou Tingting, Niu Shuxin, Li Xin, Si Yuan, Wang Yue, Shi Zhenmei, Guo Xinlong, Zhong Yulong · 发表于：Journal of Physics Conference Series · 年份：2025 · DOI：10.1088/1742-6596/2956/1/012049 · 研究领域：Material Properties and Applications、Materials Engineering and Processing、Additive Manufacturing and 3D Printing Technologies

Abstract Single crystal high-temperature alloy hollow blades are crucial components in aircraft engines, utilizing ceramic cores for their internal structure. Turbine blade designs have evolved from simple solid structures to complex hollow and multi-layered wall structures. The fabrication of multi-layered wall structures necessitates the use of water-soluble cores. In this study, the addition of graphite powder enhances the bending strength and toughness of water-soluble cores while reducing linear shrinkage and dissolution rates. Moreover, increasing the particle size of graphite powder enhances the core’s strength, with the highest bending strength reaching 20 MPa. However, larger graphite particle sizes correspondingly increase dissolution rates, with a maximum of 0.37 g/min observed. Notably, using 20-mesh graphite powder results in minimal linear shrinkage at 0.27%. Water cores modified with graphite powder exhibit low moisture absorption, facilitating smooth surfaces on multi-layered ceramic cores suitable for complex core preparations.