液态硅树脂对氧化铝基陶瓷型芯性能的影响-中国材料进展

文章信息/Info

Title:: Effect of Liquid Silicone Resin on the Properties of Al2O3 Based Ceramic Core

作者:: 杨志彬1; 张阳1; 蒲发源1; 冯浩1; 康婷1; 贾文锐1; 余建波2; （1. 江苏科技大学冶金与材料工程学院，江苏张家港 215600）（2. 上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室，上海 200072）

Author(s):: YANG Zhibin1; ZHANG Yang1; PU Fayuan1; FENG Hao1; KANG Ting1; JIA Wenrui1; YU Jianbo2; (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)

Keywords:: liquid silicone resin; Al2O3; ceramic core; bending strength; length shrinkage

摘要:: 航空发动机上的叶片是航空发动机的“心脏”部件，叶片性能的好坏对航空发动机的性能起决定性作用。高性能空心叶片的制备对生产综合性能高的陶瓷型芯提出了更高的要求。以球形氧化铝粉末为基体材料，液态硅树脂为粘结剂，利用干压法制备陶瓷型芯素坯并使用管式电炉在空气气氛中烧结。系统研究了不同烧结温度和液态硅树脂含量对陶瓷型芯相组成、显微组织和烧结性能的影响。结果表明，添加液态硅树脂对陶瓷型芯抗弯强度、线性收缩率、显气孔率和体积密度影响显著。相同烧结温度下，陶瓷型芯样品线性收缩率和抗弯强度随液态硅树脂量的增大而增大，而显气孔率和体积密度则相应减小。当液态硅树脂质量分数为0.8%时，陶瓷型芯显气孔率和体积密度变化最为稳定，线性收缩率也能保证良好的尺寸精度；当烧结温度为1550 ℃时，抗弯强度达到最大值50.76 MPa。

Abstract:: 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 ballshaped 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 ℃.