(1. School of Metallurgy and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, China) (2. State Key Laboratory of Advanced Special Steels, Department of Material Science and Engineering, Shanghai University, Shanghai 200072, China)
The blades on an aero engine are the “heart” components of an aero engine. The properties of the blades plays a decisive role in the performance of the aero engine. The preparation of high-performance hollow blades puts forward higher requirements for the production of ceramic cores with high comprehensive performance.With ballshaped Al2O3 powders as the matrix and liquid silicone resin as the precursor, the Al2O3-based ceramic core biscuits were prepared by dry pressing method and sintered in air atmosphere by tube electric furnace.Effects of silicone resin content and sintering temperature on phase composition, microstructure and properties of the Al2O3-based ceramic cores were investigated. The results showed that the effect of liquid silicone resin on the bulk density, apparent porosity and bending strength is significant. As the content of liquid silicone resin increases, the length shrinkage and bending strength increase while the bulk density and apparent porosity decrease. When the content of liquid silicone resin is 0.8wt%, the change of apparent porosity and bulk density of ceramic core is the most stable, and the length shrinkage can also ensure good dimensional accuracy. At the same time, the bending strength reaches the maximum value of 50.76 MPa at the sintering temperature of 1550 ℃.