Crack-Growth Behavior in Thermal Barrier Coatings with Cyclic Thermal Exposure

被引：15

作者：

Song, Dowon ^{[1
]}

Song, Taeseup ^{[1
]}

Paik, Ungyu ^{[1
]}

Lyu, Guanlin ^{[2
]}

Jung, Yeon-Gil ^{[2
]}

Choi, Baig-Gyu ^{[3
]}

Kim, In-Soo ^{[3
]}

Zhang, Jing ^{[4
]}

机构：

[1] Hanyang Univ, Dept Energy Engn, Seoul 133791, South Korea

[2] Changwon Natl Univ, Sch Mat Sci & Engn, Chang Won 641773, Gyeongnam, South Korea

[3] Korea Inst Mat Sci, High Temp Mat Res Grp, 797 Changwondaero, Chang Won 641831, Gyeongnam, South Korea

[4] Indiana Univ Purdue Univ, Dept Mech & Engn, Indianapolis, IN 46202 USA

来源：

COATINGS | 2019年 / 9卷 / 06期

关键词：

thermal barrier coating; cyclic thermal fatigue; crack growth; initial crack length; failure; HIGH HEAT-FLUX; FRACTURE-TOUGHNESS; FAILURE MECHANISMS; RESIDUAL-STRESSES; ANALYTICAL-MODEL; PART; MULTILAYER; DELAMINATION; DURABILITY; SYSTEMS;

D O I：

10.3390/coatings9060365

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Crack-growth behavior in yttria-stabilized zirconia-based thermal barrier coatings (TBCs) is investigated through a cyclic thermal fatigue (CTF) test to understand TBCs' failure mechanisms. Initial cracks were introduced on the coatings' top surface and cross section using the micro-indentation technique. The results show that crack length in the surface-cracked TBCs grew parabolically with the number of cycles in the CTF test. Failure in the surface-cracked TBC was dependent on the initial crack length formed with different loading levels, suggesting the existence of a threshold surface crack length. For the cross section, the horizontal crack length increased in a similar manner as observed in the surface. By contrast, in the vertical direction, the crack did not grow very much with CTF testing. An analytical model is proposed to explain the experimentally-observed crack-growth behavior.

引用

页数：12

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