锆英粉型壳与DD6单晶合金的界面反应  

Interface Reactions between Zircon Mold and DD6 Single Crystal Superalloy

作　　者：饶洋 姚建省 王丽丽 李鑫 牛书鑫 Rao Yang;Yao Jiansheng;Wang Lili;Li Xin;Niu Shuxin(Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Material)

机构地区：[1]中国航发北京航空材料研究院先进高温结构材料重点实验室

出　　处：《特种铸造及有色合金》2018年第4期408-411,共4页Special Casting & Nonferrous Alloys

摘　　要：采用扫描电镜、能谱分析等手段研究了DD6单晶合金与锆英粉型壳的界面反应。结果表明,DD6高温合金与锆英粉型壳的界面反应产物为Al_2O_3、HfO_2、Nb/Ta氧化物和单质Si。由于锆英粉的主成分ZrSiO_4高温易分解,界面反应有局部加剧的趋势,反应产物粘附在型壳表面,导致界面处型壳侧生成5~8μm厚的Al_2O_3层,合金表面出现缺陷坑。通过分析"Al元素氧化-ZrSiO_4分解-低熔点富Si液相形成-Al_2O_3颗粒析出"的反应过程,建立了"反应坑"型的界面反应模型。The interface reactions between DD6 single crystal superalloy and ceramic shells were investigated by scanning electron microscopy（SEM）and energy dispersive spectroscopy（EDS）.The results show that the interface reaction products of DD6 superalloy and Zr mold are composed of Al2O3,HfO2,oxide Nb/Ta and Si.The interfacial reactions are enhanced due to the decomposition of ZrSiO4 at high temperature,and the reaction products are adhered to the face coat of the mold to generate Al2O3 reaction layer with 5-8μm in thickness at the mold side.The defects can be observed on the surface of the alloy simultaneously.The＂reaction pitting＂model was established by analyzing the reaction process of＂Al element oxidation-ZrSiO4 decomposition-a low melting point of Si-rich liquid phase formation-Al2O3 particle precipitation＂.

关 键 词：DD6单晶合金 锆英粉型壳 界面反应 

分 类 号：TG214[金属学及工艺—铸造] TG249.5[机械工程—精密仪器及机械]