锆英粉矿化剂对氧化铝基陶瓷型芯性能的影响  

Effect of Zircon Powder on Properties of Alumina-Based Ceramic Core

作　　者：刘孝福[1] 娄延春[1] 苏贵桥[1] 于波[1] 郭新力[1] 李彪[1] 李长春[1] 税国彦[1] 关洋[1] 

机构地区：[1]沈阳铸造研究所,辽宁沈阳110022

出　　处：《铸造》2015年第10期994-1000,共7页Foundry

基　　金：科技部国家国际科技合作项目(2011DFR70820)

摘　　要：采用电熔刚玉粉为主体材料,研究了矿化剂锆英粉的不同含量对氧化铝陶瓷型芯烧成收缩率、室温抗弯强度、高温抗弯强度、高温变形量等性能的影响。从热力学和动力学角度分析了莫来石的形成机理。测试了氧化铝陶瓷型芯的热膨胀性能。利用研制的大尺寸氧化铝陶瓷型芯,在液态金属冷却定向凝固炉上拉制出了某重型燃气轮机大尺寸定向叶片。Electro-fused corundum is used as main material to study the effects of different zircon powder contents on properties of alumina-based ceramic core, such as sintering shrinkage, room temperature flexural strength, high temperature flexural strength, high temperature deformation, and so on. Formation mechanism of mullite is analyzed from thermodynamics and kinetic, and the thermal expansion property of alumina ceramic core is also tested. With the developed alumina ceramic core, large-sized blades for heavy duty gas turbine were fabricated in the process of liquid metal cooling directional solidification.

关 键 词：氧化铝型芯 矿化剂 莫来石 重型燃机 定向叶片 

分 类 号：TG24[金属学及工艺—铸造]