High temperature oxidation resistance of TNM alloy coated with/without 8YSZ/NiCoCrAlY thermal barrier coatings

被引：15

作者：

Zhang, Yefei ^{[1
]}

Jiang, Haitao ^{[1
]}

Tian, Shiwei ^{[1
]}

Xu, Wei ^{[1
]}

Wang, Tianxiang ^{[1
]}

Zhang, Siyuan ^{[1
]}

Zeng, Shangwu ^{[2
]}

Luo, Wei ^{[1
]}

Zhang, Yun ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Natl Engn Res Ctr Adv Rolling & Intelligent Mfg, Beijing 100083, Peoples R China

[2] China Met Informat & Standardizat Res Inst, Beijing 100025, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2023年 / 611卷

基金：

中国国家自然科学基金;

关键词：

Oxidation resistance; Thermal barrier coating; Interdiffusion mechanism; Thermal growth oxide; TNM alloy; COMPOSITE COATINGS; MCRALY COATINGS; TGO GROWTH; HIGH NB; BEHAVIOR; CR; AL; NI; MICROSTRUCTURE; MO;

D O I：

10.1016/j.apsusc.2022.155704

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The oxidation resistance of the TNM alloy (Ti-44Al-4Nb-1.5Mo (B, Y) (at. %)) coated with/without 8YSZ/NiCoCrAlY thermal barrier coating (TBC) was conducted through cyclic oxidation at 950 degrees C. The formation mechanism of oxide scale, interface interdiffusion mechanism, and evolution law of thermal growth oxide (TGO) were systematically investigated. Results show that the weight gains of the TNM alloy coated with/without TBC are 2.45 mg/cm2 and 6.98 mg/cm2, respectively. The Ti-Al-N layer and the (Nb, Mo)-rich layer near the surface play a role in blocking the internal diffusion of air and the external diffusion of metal ions. After a comprehensive analysis of EPMA and SEM results, it is concluded that the diffusion rate of elements in NiCoCrAlY is Ni > Co > Cr. At the same time, the relationship between the interface diffusion layer thickness and oxidation time is built based on Fick's first law. In addition, as the oxidation time increases, TGO evolves from a dense Al2O3 layer to CS (chromia, spinel oxide) layer, and CSN (chromia, spinel, and nickel oxide) cluster oxides. The mixed oxides induce crack nucleation and growth, thereby reducing TBC lifetime.

引用

页数：13

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