Experimental and numerical life prediction of thermally cycled thermal barrier coatings

被引:49
作者
Liu, Y [1 ]
Persson, C
Wigren, J
机构
[1] Lund Univ, Dept Mech Engn, Div Mat Engn, SE-22100 Lund, Sweden
[2] Volvo Aero Corp, Surface Technol, SE-46181 Trollhuttan, Sweden
关键词
bond coat oxidation; finite element method; in-plane stress range; life prediction model; stress relaxation; thermal shock tests;
D O I
10.1361/10599630420399
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
This article addresses the predominant degradation modes and life prediction of a plasma-sprayed thermal barrier coating (TBC). The studied TBC system consists of an air-plasm a-sprayed bond coat and an air-plasma-sprayed, yttria partially stabilized zirconia top layer on a conventional Hastelloy X substrate. Thermal shock tests of air-sprayed TBC and pre-oxidized TBC specimens were conducted under different burner flame conditions at Volvo Aero Corporation (Trollhiittan, Sweden). Finite element models were used to simulate the thermal shock tests. Transient temperature distributions and thermal mismatch stresses in different layers of the coatings during thermal cycling were calculated. The roughness of the interface between the ceramic top coat and the bond coat was modeled through an ideally sinusoidal wavy surface. Bond coat oxidation was simulated through adding an aluminum oxide layer between the ceramic top coat and the bond coat. The calculated stresses indicated that interfacial delamination cracks, initiated in the ceramic top coat at the peak of the asperity of the interface, together with surface cracking, are the main reasons for coating failure. A phenomenological life prediction model for the coating was proposed. This model is accurate within a factor of
引用
收藏
页码:415 / 424
页数:10
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