添加AlF_(3)·3H_(2)O对精密铸造用陶瓷型壳组织与性能的影响  

Effect of AlF_(3)·3H_(2)O addition on microstructure and properties of ceramic shell for investment casting

作　　者：李治辉 赵彦杰[1] 陈晓燕[1] 戚诚康 来俊华 陆亮亮 李飞[1,2] LI Zhihui;ZHAO Yanjie;CHEN Xiaoyan;QI Chengkang;LAI Junhua;LU Liangliang;LI Fei(Shanghai Key Laboratory for High Temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of Metal Matrix Composities,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学上海市先进高温材料及其精密成型重点实验室,上海200240 [2]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《材料工程》2024年第12期188-195,共8页Journal of Materials Engineering

基　　金：航空发动机及燃气轮机重大专项基础研究项目(J2019-Ⅵ-0004-0117);国家自然科学基金项目(52074183);国家重点基础研究发展计划项目(2022YFB3706300);航空发动机及燃气轮机基础科学中心项目(2022-A-Ⅰ-001-002)。

摘　　要：以电熔刚玉粉为原料、硅溶胶为黏结剂和三水合氟化铝为莫来石相转化促进剂,设计涡轮叶片定向凝固成型用陶瓷型壳背层浆料配方,并制备陶瓷型壳。研究型壳的微观结构与相组成、高温透气性、热膨胀、高温力学及抗高温变形等性能。结果表明:经1200℃的焙烧,在三水合氟化铝的催化作用下,型壳中的氧化铝与二氧化硅发生反应而生成莫来石晶须;与未添加三水合氟化铝的陶瓷型壳相比,其透气性提升约1倍,热扩散系数增加且热膨胀系数有所降低,同时三水合氟化铝的添加还使型壳的高温强度降低到合适的范围内,提高型壳的高温退让性,并使型壳仍保持良好的抗高温变形性能。Using fused corundum powder as raw material,silica sol as a binder,and aluminum fluoride trihydrate as mullite phase conversion promoter,the slurry composition of the ceramic shell for directional solidification molding of turbine blades was designed,and the ceramic shell was prepared.The microstructure and phase composition,high-temperature permeability,thermal expansion,hightemperature mechanics,and resistance to high-temperature deformation of the shell were studied.The results show that after sintering at 1200℃,with the help of the catalysis of aluminum fluoride trihydrate,the alumina in the shell reacts with silicon dioxide to produce a mullite whisker.Compared with the ceramic shell without aluminum fluoride trihydrate,the permeability of the shell is increased by about 1 time,the thermal diffusion coefficient is increased,and the thermal expansion coefficient is decreased.At the same time,the addition of aluminum fluoride trihydrate also reduces the high-temperature strength of the shell to a suitable range,improves the high-temperature yield of the shell,and makes the shell maintain a good high-temperature deformation resistance.

关 键 词：涡轮叶片 定向凝固 陶瓷型壳 三水合氟化铝 莫来石晶须 

分 类 号：TG24[金属学及工艺—铸造] TB32[一般工业技术—材料科学与工程]