一种镍基定向凝固高温合金与陶瓷铸模的界面反应研究  

Interface Reaction Between Ni-Based Directional Solidification Superalloy and Ceramic Mold

作　　者：张俊[1] 黄嘉鹏[2] 尚根峰 汪航[3] 

机构地区：[1]中国航空工业集团公司北京航空材料研究院,北京100095 [2]江西理工大学材料科学与工程学院,江西赣州341000 [3]江西理工大学工程研究院,江西赣州341000

出　　处：《铸造技术》2017年第5期1069-1074,共6页Foundry Technology

基　　金：国家自然科学基金资助项目(51401095);江西省科技厅留学归国人员扶助计划(20161BBH80030);江西理工大学博士启动基金(jxxjbs15001)

摘　　要：采用扫描电子显微镜和能谱等分析手段研究了某镍基定向凝固高温合金与SiO_2基陶瓷型壳以及Al_2O_3基陶瓷型芯的界面反应。实验结果表明,该镍基定向凝固合金与SiO_2基陶瓷型壳会发生较严重的界面反应,在合金与SiO_2基型壳之间有一层约3~5μm厚的白色HfO_2层和一层稀薄的Al_2O_3层,反应产物的富集可以抑制界面反应的进一步进行;而与Al_2O_3基型芯几乎不发生界面反应,只有微量的HfO_2在界面处零星分布。同时,这一结果符合了界面反应的热力学关系。虽然Al_2O_3基型芯能有效减少界面反应,但Al_2O_3基型芯存在较多的空隙,合金熔液在凝固时渗入其中增加了合金表面的粗糙度,提高Al_2O_3基铸型的致密度有利于提高合金铸件表面品质。The interface reaction between a Ni-based directional solidification superalloy and ceramic mold（SiO2-base shell or Al2O3-base core） was studied by scanning electron microscopy（SEM） and energy dispersive spectroscopy（EDS）. The results show that there is a serious interface reaction between the Ni-based superalloy and SiO2-base ceramic shell, the reaction products is a white layer of HfO2 about 3 5 μm thick and a thin layer of Al2O3. As the reaction products are enriched in the interface of alloy/mold, the interface reactions were inhibited. But there is hardly a interface reaction between the superalloy and Al2O3-based core, only a tiny amounts of HfO2 disperse at the interfaces. At the same time, the results accord with thermodynamics relations. Although Al2O3-based core can effectively reduce the interface reaction, the holes in Al2O3-based core increase the surface roughness of alloy because of melting liquid infiltrates during solidification,improving the density of Al2O3-base mold is helpful to improve the surface quality of castings.

关 键 词：镍基定向凝固合金 SiO2基型壳 Al2O3基型芯 界面反应 

分 类 号：TG214[金属学及工艺—铸造]