INITIATION OF SURFACE CRACKS IN MULTILAYER CERAMIC THERMAL BARRIER COATINGS UNDER THERMAL LOADS

被引：42

作者：

KOKINI, K

TAKEUCHI, YR

机构：

[1] Purdue University, Ray W. Herrick Laboratories, School of Mechanical Engineering, West Lafayette

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1994年 / 189卷 / 1-2期

关键词：

D O I：

10.1016/0921-5093(94)90428-6

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The initiation of surface cracks in thick ceramic thermal barrier coatings systems was studied by using controlled experiments and the corresponding analysis. The experimental boundary conditions consisted of a concentrated heat flux at the surface of the coating and water cooling at the bottom of the substrate. The results showed that tensile stresses were formed at the surface during cooling following stress relaxation during steady state heating. A parametric study showing that a low Young's modulus and a low coefficient of thermal expansion for the coating would reduce these tensile stresses and increase its durability.

引用

页码：301 / 309

页数：9

共 26 条

[1]

AKEUCHI YR, 1994, J ENG GAS TURB POWER, V116, P266

[2]

ALEXANDER WD, 1988, 3RD P INT C CER MAT, P1449

[3] FAILURE DURING THERMAL CYCLING OF PLASMA-SPRAYED THERMAL BARRIER COATINGS [J].