Microstructure and thermo-physical properties of yttria stabilized zirconia coatings with CMAS deposits

被引：209

作者：

Wu, Jing ^{[1
]}

Guo, Hong-bo ^{[1
]}

Gao, Yu-zhi ^{[1
]}

Gong, Sheng-kai ^{[1
]}

机构：

[1] Minist Educ, Key Lab Aerosp Mat & Performance, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2011年 / 31卷 / 10期

关键词：

Thermal barrier coatings (TBCs); Calcium-magnesium-alumina-silicate (CMAS); Microstructure; Thermal diffusivity; Microhardness; BARRIER COATINGS; MECHANISMS; TEMPERATURE; DURABILITY; POROSITY;

D O I：

10.1016/j.jeurceramsoc.2011.04.006

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) are used to protect hot-components in aero-engines from hot gases. In this paper, the microstructure and thermo-physical and mechanical properties of plasma sprayed YSZ coatings under the condition of calcium-magnesium-alumina-silicate (CMAS) deposits were investigated. Si and Ca in the CMAS rapidly penetrated the coating at 1250 degrees C and accelerated sintering of the coating. At the interface between the CMAS and YSZ coating, the YSZ coating was partially dissolved in the CMAS, inducing the phase transformation from tetragonal phase to monoclinic phase. Also, the porosity of the coating was reduced from similar to 25% to 5%. As a result, the thermal diffusivity at 1200 degrees C increased from 0.3 mm(2)/s to 0.7 mm(2)/s, suggesting a significant degradation in the thermal barrier effect. Also, the coating showed a similar to 40% increase in the microhardness. The degradation mechanism of TBC induced by CMAS was discussed. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1881 / 1888

页数：8

共 30 条

[1] Novel thermal barrier coatings that are resistant to high-temperature attack by glassy deposits [J].

Aygun, Aysegul ;

Vasiliev, Alexander L. ;

Padture, Nitin P. ;

Ma, Xinqing .

ACTA MATERIALIA, 2007, 55 (20) :6734-6745

[2] Role of environmental deposits and operating surface temperature in spallation of air plasma sprayed thermal barrier coatings [J].

Borom, MP ;

Johnson, CA ;

Peluso, LA .

SURFACE & COATINGS TECHNOLOGY, 1996, 86 (1-3) :116-126

[3] Calcium-magnesium-alumina-silicate (CMAS) delamination mechanisms in EB-PVD thermal barrier coatings [J].

Chen, X .

SURFACE & COATINGS TECHNOLOGY, 2006, 200 (11) :3418-3427

[4] Mechanisms controlling the durability of thermal barrier coatings [J].

Evans, AG ;

Mumm, DR ;

Hutchinson, JW ;

Meier, GH ;

Pettit, FS .

PROGRESS IN MATERIALS SCIENCE, 2001, 46 (05) :505-553

[5] Mechanics-based scaling laws for the durability of thermal barrier coatings [J].

Evans, AG ;

He, MY ;

Hutchinson, JW .

PROGRESS IN MATERIALS SCIENCE, 2001, 46 (3-4) :249-271

[6] Thermal barrier coatings for aeroengine applications [J].

Gleeson, B .

JOURNAL OF PROPULSION AND POWER, 2006, 22 (02) :375-383

[7] Effect of hollow spherical powder size distribution on porosity and segmentation cracks in thermal barrier coatings [J].

Guo, H. B. ;

Murakami, H. ;

Kuroda, S. .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2006, 89 (12) :3797-3804

[8] Segmented thermal barrier coatings produced by atmospheric plasma spraying hollow powders [J].

Guo, HB ;

Kuroda, S ;

Murakami, H .

THIN SOLID FILMS, 2006, 506 :136-139

[9] Effects of heat treatment on microstructures and physical properties of segmented thermal barrier coatings [J].

Guo, HB ;

Murakami, H ;

Kuroda, S .

MATERIALS TRANSACTIONS, 2005, 46 (08) :1775-1778

[10] Thermophysical properties and thermal cycling behavior of plasma sprayed thick thermal barrier coatings [J].

Guo, HB ;

Vassen, R ;

Stöver, D .

SURFACE & COATINGS TECHNOLOGY, 2005, 192 (01) :48-56

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