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Fabrication of high-strength silica-based ceramic cores enhanced by SiC support structures and powder-filling

Xue CuiSchool of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, PR ChinaTongqi ZhangSchool of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, PR ChinaXin XieSchool of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, PR ChinaZhisheng NongSchool of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, PR ChinaQiangang XuSchool of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, PR ChinaHongliang ZhangSchool of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, PR ChinaTeng LiuSchool of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, PR ChinaTiannan ManSchool of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, PR ChinaAbsanov AkhmadSamarkand State University named after Sharof Rashidov, Samarkand 140104, Republic of UzbekistanJingchuan ZhuSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, PR China

2026en

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Litsenziya: cc-by-nc-nd

ABI

Annotatsiya

Ceramic cores play a critical role in the manufacturing of turbine blades for aero-engines. However, current silica-based ceramic cores suffer from insufficient flexural strength. In this study, nano-SiC was introduced as a reinforcing phase to regulate the microstructure and enhance the mechanical properties. The slurry viscosity increased with increasing SiC content (10–20 wt.%), while the slurry containing 15 wt.% SiC exhibited relatively good stability. The sintered ceramic reached a maximum flexural strength of 33.77 MPa at 15 wt.% SiC. This enhancement was mainly attributed to the formation of interconnected SiC support frameworks within large pores and the filling of smaller pores by nano-SiC particles, thereby reducing stress concentration and improving load transfer. Thermal analysis showed mass gains of approximately 1.845% in N 2 and 2.209% in air between 1000 and 1200 °C, suggesting enhanced oxidation-related reactions in air. Alkaline leaching tests further showed that the 15 wt.% SiC sample exhibited a weight loss of approximately 30.5% after 24 h. In addition, the relative energetic stability of different SiC polytypes was further evaluated using first-principles calculations. These findings are expected to provide theoretical guidance for the subsequent development of high-strength silica-based ceramic cores.

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DOI: 10.1016/j.jmrt.2026.11.009

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