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。
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 Al_(2)O_(3) powders as the matrix and liquid silicone resin as the precursor,the Al 2O 3-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 Al_(2)O_(3)-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℃.
作者
杨志彬
张阳
蒲发源
冯浩
康婷
贾文锐
余建波
YANG Zhibin;ZHANG Yang;PU Fayuan;FENG Hao;KANG Ting;JIA Wenrui;YU Jianbo(School of Metallurgy and Materials Engineering,Jiangsu University of Science and Technology,Zhangjiagang 215600,China;State Key Laboratory of Advanced Special Steels,Department of Material Science and Engineering,Shanghai University,Shanghai 200072,China)
出处
《中国材料进展》
CAS
CSCD
北大核心
2021年第7期535-541,共7页
Materials China
基金
国家自然科学基金项目(51404148,51690162,U15060202)。
关键词
液态硅树脂
氧化铝
陶瓷型芯
抗弯强度
线性收缩率
liquid silicone resin
Al_(2)O_(3)
ceramic core
bending strength
length shrinkage