Fracture characteristics of freestanding 8 wt% Y2O3-ZrO2 coatings by single edge notched beam and Vickers indentation tests

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:581

Article

Wan, J.^1,2  Zhou, M.^1,2  Yang, X. S.^1,2  Dai, C. Y.^1,2  Zhang, Y.^1,2  Mao, W. G.^1,2  Lu, C.³ 

[1] Xiangtan Univ, Key Lab Low Dimens Mat & Applicat Technol, Minist Educ, Xiangtan 411105, Hunan, Peoples R China

[2] Xiangtan Univ, Fac Mat Optoelect & Phys, Xiangtan 411105, Hunan, Peoples R China

[3] Curtin Univ, Dept Mech Engn, Perth, WA 6845, Australia

关键词: Thermal barrier coating;    Fracture toughness;    Single edge notched beam;    Vickers indentation;    Digital image correlation;   

DOI  :  10.1016/j.msea.2013.05.086

来源: Elsevier

【 摘 要 】

The freestanding 8 wt% Y2O3-ZrO2 (8YSZ) samples prepared by an air plasma sprayed technique were measured by single edge notched bending tests. The strain evolution and cracking near a pre-existed notch region were in-situ monitored by digital image correlation. With the help of digital image data, the critical bending loads of these notched freestanding 8YSZ samples can be accurately determined. The fracture toughness and micro-hardness of freestanding 8YSZ samples were tested by Vickers indentations. The normalized fracture toughness calculated according to the Weibull statistics is in agreement with the testing and available data. These results are instructive in predicting the lifetime and durability of thermal barrier coatings with irregular geometric structures. (c) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

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