Thermal Cyclic Oxidation and Inter-Diffusion Behaviors of MCrAlY-Coated Single Crystal Superalloy DD6

LIU Jiuxiang; CUI Xiangzhong; GAO Wei; ZHOU Guodong

doi:10.16080/j.issn1671-833x.2017.08.037

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Thermal Cyclic Oxidation and Inter-Diffusion Behaviors of MCrAlY-Coated Single Crystal Superalloy DD6

更新时间：2026-04-17

- Thermal Cyclic Oxidation and Inter-Diffusion Behaviors of MCrAlY-Coated Single Crystal Superalloy DD6
- Aeronautical Manufacturing Technology Vol. 60, Issue 8, Pages: 37-43(2017)
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- DOI：10.16080/j.issn1671-833x.2017.08.037
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- Published：2017
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刘九香，崔向中，高巍，周国栋，姜春竹. 两种MCrAlY涂层/DD6合金的循环氧化和互扩散行为[J]. 航空制造技术, 2017, 60(8): 37-43.

LIU Jiuxiang, CUI Xiangzhong, GAO Wei, ZHOU Guodong, JIANG Chunzhu. Thermal Cyclic Oxidation and Inter-Diffusion Behaviors of MCrAlY-Coated Single Crystal Superalloy DD6. Aeronautical Manufacturing Technology, 2017, 60(8): 37-43.
刘九香，崔向中，高巍，周国栋，姜春竹. 两种MCrAlY涂层/DD6合金的循环氧化和互扩散行为[J]. 航空制造技术, 2017, 60(8): 37-43. DOI： 10.16080/j.issn1671-833x.2017.08.037.

LIU Jiuxiang, CUI Xiangzhong, GAO Wei, ZHOU Guodong, JIANG Chunzhu. Thermal Cyclic Oxidation and Inter-Diffusion Behaviors of MCrAlY-Coated Single Crystal Superalloy DD6. Aeronautical Manufacturing Technology, 2017, 60(8): 37-43. DOI： 10.16080/j.issn1671-833x.2017.08.037.

摘要

在DD6 单晶高温合金基体上，利用电子束物理气相沉积（EB-PVD）技术制备NiCoCrAlY 涂层，采用低压等离子喷涂（LPPS）技术制备NiCoCrAlYHfSi 涂层，通过扫描电镜（SEM）、X 射线能谱（EDS）、X 射线衍射（XRD）、电子探针显微分析（EPMA）等手段研究了在1100℃下的热循环氧化和互扩散行为。结果表明，涂层显著提高了 DD6 基体的抗氧化能力，经100h 的循环氧化后，涂层表面氧化层主要成分仍为α-Al2O3，依然发挥着较好的抗氧化保护作用。这两种涂层与基体之间形成了互扩散区（IDZ）和二次反应区（SRZ），IDZ 和SRZ 的厚度均随着循环氧化时间延长而增大；SRZ 中析出的棒状与颗粒状的拓扑密堆相（TCP）含有W、Re、Mo 等高熔点元素，其质量分数分别高达37.51%、14.22% 和10.61%，TCP 含量随着氧化时间而增多。活性元素Si、Hf 对涂层中富 Cr 相和TGO 的增长速率均有一定的抑制作用。

Abstract

Two types of MCrAlY coatings NiCoCrAlY and NiCoCrAlYHfSi were deposited on DD6 specimens by electron beam physical vapor deposition (EB-PVD) and low pressure plasma spray (LPPS) respectively. The coating surface

cross-section morphologies and phase structures of the specimens were investigated by scanning electron microscopy (SEM)

energy dispersive spectroscopy (EDS)

electron probe micro-analyzer (EPMA) and X ray diffraction (XRD) after 1100℃ cyclic oxidation for different time. The utilization of NiCoCrAlY and NiCoCrAlYHfSi coatings prominently enhance the oxidation resistance of DD6 alloy. After 100h oxidation

α-Al2O3 is still the major phase in the oxide scales formed on the coated specimens. Inter-diffusion occurs between the coatings and the substrate

which leads to the formation of the interdifusion zone (IDZ) and second reaction zone (SRZ). The rod-like TCP phase and the granular TCP phases precipitated in the SRZ

which are rich in W

Mo. Reactive elements (RE) Si

Hf have suppression action on the formation of Cr-rich phase and the growth rate of TGO.

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