Oxidation behavior of a plasma-sprayed functionally graded 7rO2/Al2O3 thermal barrier coating

被引：60

作者：

Widjaja, S ^{[1
]}

Limarga, AM ^{[1
]}

Yip, TH ^{[1
]}

机构：

[1] Nanyang Technol Univ, Div Sci Mat, Singapore 639798, Singapore

来源：

MATERIALS LETTERS | 2002年 / 57卷 / 03期

关键词：

thermal barrier coating; oxidation behavior; residual stress; phase transformation; alumina; zirconia; thermally grown oxide;

D O I：

10.1016/S0167-577X(02)00842-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermally grown oxide (TGO) scales can provide high temperature oxidation protection if they are slow growing, sound and adherent to the substrate. In thermal barrier coatings (TBCs), failure occurs near or at the interface between the metallic bondcoat and its thermally grown alumina layer. Oxide scales consisting mainly of alumina were grown on duplex (ZrO2/bondcoat) and functionally graded (ZrO2/Al2O3/bondcoat) systems through static heat treatment at 1050 degreesC. Electron microscopy was used to analyze the microstructures of oxide layers grown on various TBC systems. The difference in thickness of grown oxide scale that resulted from oxidation of various TBC systems was discussed in the light of the effectiveness of alumina interlayer functioning as an additional oxidation barrier. Spallation observed at higher temperature in a functionally graded system was due to phase transformation of gamma-Al2O3 to alpha-Al2O3, inducing additional residual stress causing a premature failure. However, TBC systems with a thin layer of Al2O3 were found to be effective in improving oxidation resistance of protective coatings. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：628 / 634

页数：7

共 18 条

[1] MICROSTRUCTURAL INVESTIGATIONS OF PLASMA-SPRAYED YTTRIA PARTIALLY-STABILIZED ZIRCONIA TBC (IN RELATION TO THERMOMECHANICAL RESISTANCE AND HIGH-TEMPERATURE OXIDATION MECHANISMS) [J].

ALPERINE, S ;

LELAIT, L .

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, 1994, 116 (01) :258-265

[2]

[Anonymous], COAT HIGH TEMP STRUC

[3]

Brindley WJ, 1997, J THERM SPRAY TECHN, V6, P3, DOI 10.1007/BF02646305

[4] Nondestructive evaluation of the oxidation stresses through thermal barrier coatings using Cr3+ piezospectroscopy [J].

Christensen, RJ ;

Lipkin, DM ;

Clarke, DR ;

Murphy, K .

APPLIED PHYSICS LETTERS, 1996, 69 (24) :3754-3756

[5] The evolution of oxidation stresses in zirconia thermal barrier coated superalloy leading to spalling failure [J].

Clarke, DR ;

Christensen, RJ ;

Tolpygo, V .

SURFACE & COATINGS TECHNOLOGY, 1997, 94-5 (1-3) :89-93

[6] Micromechanics model for the detachment of residually compressed brittle films and coatings [J].

Evans, AG ;

Hutchinson, JW ;

He, MY .

ACTA MATERIALIA, 1999, 47 (05) :1513-1522

[7]

Haynes JA, 1996, SURF COAT TECH, V86, P102, DOI 10.1016/S0257-8972(96)02985-4

[8] Phase transformation and bond coat oxidation behavior of plasma-sprayed zirconia thermal barrier coating [J].

Lee, CH ;

Kim, HK ;

Choi, HS ;

Ahn, HS .

SURFACE & COATINGS TECHNOLOGY, 2000, 124 (01) :1-12

[9] Concept of functionally graded materials for advanced thermal barrier coating applications [J].

Lee, WY ;

Stinton, DP ;

Berndt, CC ;

Erdogan, F ;

Lee, YD ;

Mutasim, Z .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1996, 79 (12) :3003-3012

[10]

Levin I, 1998, J AM CERAM SOC, V81, P1995, DOI 10.1111/j.1151-2916.1998.tb02581.x

← 1 2 →