Sintering and creep behavior of plasma-sprayed zirconia- and hafnia-based thermal barrier coatings

被引：174

作者：

Zhu, DM ^{[1
]}

Miller, RA ^{[1
]}

机构：

[1] NASA, Lewis Res Ctr, Ohio Aerosp Inst, Cleveland, OH 44135 USA

来源：

SURFACE & COATINGS TECHNOLOGY | 1998年 / 108卷 / 1-3期

关键词：

thermal barrier coatings; ceramic sintering and creep; defect structure; dilatometry;

D O I：

10.1016/S0257-8972(98)00669-0

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The sintering and creep of plasma-sprayed ceramic thermal barrier coatings under high temperature conditions are complex phenomena. Changes in thermomechanical and thermophysical properties and in the stress response of these coating systems as a result of the sintering and creep processes are detrimental to coating thermal fatigue resistance and performance. In this paper, the sintering characteristics of ZrO2-8wt%Y2O3, ZrO2-25wt%CeO2-2.5wt%Y2O3, ZrO2-6w%NiO-9wt%Y2O3, ZrO2-6wt%Sc2O3-2wt%Y2O3 and HfO2-27wt%Y2O3 coating materials were investigated using dilatometry. It was found that the KfO(2)-Y2O3 and baseline ZrO2-Y2O3 exhibited the best sintering resistance, while the NiO-doped ZrO2-Y2O3 showed the highest shrinkage strain rates during the tests. Higher shrinkage strain rates of the coating materials were also observed when the specimens were tested in Ar+5%H-2 as compared to in air. This phenomenon was attributed to an enhanced metal cation interstitial diffusion mechanism under the reducing conditions. It is proposed that increased chemical stability of coating materials will improve the material sintering resistance. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：114 / 120

页数：7

共 25 条

[1]

[Anonymous], THERMAL CONDUCTIVITY

[2]

[Anonymous], 1983, NONSTOICHIOMETRY DIF

[3] POLYMORPHIC TRANSFORMATION OF T' PHASE IN YTTRIA PARTIALLY STABILIZED ZIRCONIA [J].

CHEN, S ;

SHEN, P .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1990, 123 (01) :145-152

[4]

CHOI SR, 1998, INT S ADV SYNTH PROC

[5] Mechanical properties testing and results for thermal barrier coatings [J].

Cruse, TA ;

Johnsen, BP ;

Nagy, A .

JOURNAL OF THERMAL SPRAY TECHNOLOGY, 1997, 6 (01) :57-66

[6]

CRUSE TA, 1988, GAS TURBINE AEROENGI, P1

[7]

DINWIDDIE RB, 1996, INT GAS TURB AER C E, P1

[8] SINTERING STUDIES OF PLASMA-SPRAYED ZIRCONIA [J].

EATON, HE ;

NOVAK, RC .

SURFACE & COATINGS TECHNOLOGY, 1987, 32 (1-4) :227-236

[9]

FIRESTONE RF, 1982, 6 ANN C COMP ADV CER, P758

[10]

FIRESTONE RF, 1982, CR167868 NASA

← 1 2 3 →