THE SPALLING MODES AND DEGRADATION MECHANISM OF ZRO2-8 WT-PERCENT Y2O3/CVD-AL2O3/NI-22CR-10AL-1Y THERMAL-BARRIER COATINGS

被引：36

作者：

SUN, JH ^{[1
]}

CHANG, E ^{[1
]}

CHAO, CH ^{[1
]}

CHENG, MJ ^{[1
]}

机构：

[1] AERO ENGINE FACTORY,AERO IND DEV CTR,KANG SHAN,TAIWAN

来源：

OXIDATION OF METALS | 1993年 / 40卷 / 5-6期

关键词：

THERMAL-BARRIER COATINGS (TBCS); CVD-AL2O3; BOND COAT; THERMAL-CYCLIC OXIDATION;

D O I：

10.1007/BF00666387

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

State-of-the-art conventional thermal-barrier coatings consist of a thermal-insulating, partially-stabilized ZrO2 top coat and a bond coat. In this study, a continuous alumina-diffusion-barrier layer was deposited and interposed between the top coat and bond coat by chemical-vapor deposition (CVD). Both the conventional and the experimental TBC systems were cyclically tested at 1000-degrees-C, 1050-degrees-C, 1100-degrees-C, and 1150-degrees-C to evaluate and compare oxidation, performance, and fracture behavior. Introduction of the intermediate CVD-Al2O3 layer effectively suppressed the oxidation rate of the bond coat and sufficiently altered its oxidation behavior. The thermal-cyclic life of TBCs was improved by the new system. The failure of the ZrO2-8 wt. % Y2O3/CVD-Al2O3/Ni-22Cr-10Al-1Y TBC specimens was observed to propagate mainly along the lamellar splats of the top coat, and secondarily along the top coat/CVD-Al2O3 interface.

引用

页码：465 / 481

页数：17

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