Influences of the interface roughness and the bond coat spray method on the adhesion strength in an air plasma snraved thermal barrier coatings

被引：7

作者：

Yamazaki, Yasuhiro ^{[1
]}

Kinebuchi, Toshio ^{[2
]}

Fukanuma, Hirotaka ^{[3
]}

Ohno, Naoyuki ^{[3
]}

机构：

[1] Niigata Inst. of Tech., Fujihashi, Kashiwazaki

[2] Graduate Student, Niigata Inst. of Tech., Fujihashi, Kashiwazaki

来源：

Zairyo/Journal of the Society of Materials Science, Japan | 2008年 / 57卷 / 06期

关键词：

Adhesion strength; Bond coat process; Interface roughness; Thermal barrier coating; Thermal exposure;

D O I：

10.2472/jsms.57.596

中图分类号：

学科分类号：

摘要：

In this work, in order to study the effect of the interface roughness between the bond coating and the top coating, two kinds of the CoNiCrAlY powder with the different particle size were used for spraying the bond coating material. In addition, the bond coat was sprayed by either the low-pressure plasma spray (LPPS) method or the high velocity oxy-fuel (HVOF) one. The adhesion strength of the TBC top coat was evaluated as a function of the isothermal exposure time by means of the modified 4-point bending test. In addition, in-situ observations of the initiation and propagation of delamination cracks were carried out. The experimental results indicated that the delamination cracks initiated and propagated at the intersplat boundaries in the top-coating for the as-sprayed TBC specimens. After isothermal exposure at 1000°C, the microcracks were generated in the top-coating and the thermal grown oxides (TGO) grew at the top-coating/bond-coating interface. The delamination of the thermal exposed specimen occurred by the mixed fracture mode of the microcracks and top-coating/TGO or TGO/bond-coating interfaces. There was little difference of the adhesion strength by the bond-coating process in the as-sprayed conditions. On the other hand, the LPPSed bond coat specimen which has the rough interface exhibited lower adhesion strength compared with other specimens after thermal exposure due to the remarkable growth of the mixed oxide type of the TGO. © 2008 The Society of Materials Science.

引用

页码：596 / 602

页数：6

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