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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Al2O3、HfO2、Nb/Ta氧化物和单质Si.由于锆英粉的主成分ZrSiO4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5～8 μm厚的Al2O3层,合金表面出现缺陷坑.通过分析“Al元素氧化-ZrSiO4分解-低熔点富Si液相形成-Al2O3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 5～8 μm 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-Al2 O3 particle precipitation”.