Interface Reactions between Zircon Mold and DD6 Single Crystal Superalloy

Rao Yang; Yao Jiansheng; Wang Lili; Li Xin; Niu Shuxin

doi:10.15980/j.tzzz.2018.04.017

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Interface Reactions between Zircon Mold and DD6 Single Crystal Superalloy
Vol. 38, Issue 4, Pages: 408-411(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.04.017

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[1]饶洋,姚建省,王丽丽,李鑫,牛书鑫.锆英粉型壳与DD6单晶合金的界面反应[J].特种铸造及有色合金,2018,38(04):408-411.

Rao Yang, Yao Jiansheng, Wang Lili, et al. Interface Reactions between Zircon Mold and DD6 Single Crystal Superalloy. [J]. Special Casting & Nonferrous Alloys 38(4):408-411(2018)
[1]饶洋,姚建省,王丽丽,李鑫,牛书鑫.锆英粉型壳与DD6单晶合金的界面反应[J].特种铸造及有色合金,2018,38(04):408-411. DOI： 10.15980/j.tzzz.2018.04.017.

Rao Yang, Yao Jiansheng, Wang Lili, et al. Interface Reactions between Zircon Mold and DD6 Single Crystal Superalloy. [J]. Special Casting & Nonferrous Alloys 38(4):408-411(2018) DOI： 10.15980/j.tzzz.2018.04.017.

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

、HfO

、Nb/Ta氧化物和单质Si。由于锆英粉的主成分ZrSiO

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

μm厚的Al

层

合金表面出现缺陷坑。通过分析"Al元素氧化-ZrSiO

分解-低熔点富Si液相形成-Al

颗粒析出"的反应过程

建立了"反应坑"型的界面反应模型。

Abstract

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 Al

HfO

oxide Nb/Ta and Si.The interfacial reactions are enhanced due to the decomposition of ZrSiO

at high temperature

and the reaction products are adhered to the face coat of the mold to generate Al

reaction layer with 5

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-ZrSiO

decomposition-a low melting point of Si-rich liquid phase formation-Al

particle precipitation".