Erosion behavior of CMAS/VA infiltrated EB-PVD Gd2Zr2O7 TBCs: Special emphasis on the effect of mechanical properties of the reaction products

被引：6

作者：

Steinberg, Lars ^{[1
]}

Mikulla, Christoph ^{[2
]}

Naraparaju, Ravisankar ^{[2
,6
]}

Pavlov, Paul ^{[3
]}

Loffler, Markus ^{[4
]}

Schulz, Uwe ^{[2
]}

Leyens, Christoph ^{[1
,5
]}

机构：

[1] Tech Univ Dresden, Inst Mat Sci IfWW, D-01062 Dresden, Germany

[2] German Aerosp Ctr DLR, Inst Mat Res, D-51170 Cologne, Germany

[3] Anton Paar Germany GmbH, D-73760 Ostfildern, Germany

[4] Tech Univ Dresden, Ctr Adv Elect Dresden cfaed, Dresden Ctr Nanoanal DCN, D-01062 Dresden, Germany

[5] Fraunhofer Inst Mat & Beam Technol IWS, D-01277 Dresden, Germany

[6] German Aerosp Ctr e V DLR, D-51147 Cologne, Germany

来源：

WEAR | 2022年 / 506卷

关键词：

CMAS; TBC; Erosion; EB-PVD; Gd2Zr2O7; THERMAL-BARRIER COATINGS; VOLCANIC ASH; TOP COAT; DEGRADATION; MICROSTRUCTURE; CONDUCTIVITY; ZIRCONIA; GD; TURBINE; MULTILAYER;

D O I：

10.1016/j.wear.2022.204450

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Aero-engines operating in sand-laden (CMAS/CaO-MgO-Al2O3-SiO2) environments often encounter severe problems with thermal barrier coatings (TBCs) due to CMAS infiltration and erosion damage. This study focuses on a deeper understanding of the erosion behavior of CMAS-infiltrated EB-PVD Gd2Zr2O7 TBCs. The study includes isothermal infiltration of different CMAS and subsequent erosion tests at room temperature. In addition to the erosion behavior of the entire coating, the influence of different reaction products within the reaction layer on erosion failure was investigated by measuring the hardness and Young's modulus of the individual phases using in-situ REM-Nanoindentation. It was found that a garnet layer above the reaction layer and spinel inclusions within a thick apatite/fluorite reaction layer, can improve the erosion resistance of this reaction layer by 30-40%. Furthermore, a correlation between the erosion behavior and the hardness vs. Young's modulus relation, obtained from nanoindentation over the entire coating, was observed for a consistent microstructure.

引用

页数：16

共 43 条

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