Thermal shock resistance and mechanical properties of La2Ce2O7 thermal barrier coatings with segmented structure

被引：115
作者：
Wang, Yi [1 ,2 ]
Guo, Hongbo [1 ,2 ]
Gong, Shengkai [1 ,2 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Beijing Univ Aeronaut & Astronaut, Beijing Key Lab Adv Funct Mat & Thin Film Technol, Beijing 100083, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2009年 / 35卷 / 07期
基金：
中国国家自然科学基金;
关键词：
La2Ce2O7 (LCO); Thermal barrier coatings (TBCs); Segmentation cracks; Thermal shock; MICROSTRUCTURE; STABILITY; BEHAVIOR;
D O I：
10.1016/j.ceramint.2009.02.025
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
La2Ce2O7 (LCO) is a promising candidate material for thermal barrier coatings (TBCs) application because of its higher temperature capability and better thermal insulation property relative to yttria stabilized zirconia (YSZ). In this work, La2Ce2O7 TBC with segmentation crack structure was produced by atmospheric plasma spray (APS). The mechanical properties of the sprayed coatings at room temperature including microhardness, Young's modulus, fracture toughness and tensile strength were evaluated. The Young's modulus and microhardness of the segmented coating were measured to be about 25 and 5 GPa, relatively higher than those of the non-segmented coating, respectively. The fracture toughness of the LCO coating is in a range of 1.3-1.5 MPa m(1/2) about 40% lower than that of the YSZ coating. The segmented TBC had a lifetime of more than 700 cycles, improving the lifetime by nearly two times as compared to the non-segmented TBC. The failure of the segmented coating occurred by chipping spallation and delamination cracking within the coating. (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：2639 / 2644
页数：6
相关论文
共 15 条
[1]   Plasma-sprayed glass-ceramic coatings on ceramic tiles: microstructure, chemical resistance and mechanical properties [J].
Bolelli, G ;
Cannillo, V ;
Lusvarghi, L ;
Manfredini, T ;
Siligardi, C ;
Bartuli, C ;
Loreto, A ;
Valente, T .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2005, 25 (11) :1835-1853
[2]   Ceramic materials for thermal barrier coatings [J].
Cao, XQ ;
Vassen, R ;
Stoever, D .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2004, 24 (01) :1-10
[3]  
Cao XQ, 2001, J AM CERAM SOC, V84, P2086, DOI 10.1111/j.1151-2916.2001.tb00962.x
[4]   Effect of hollow spherical powder size distribution on porosity and segmentation cracks in thermal barrier coatings [J].
Guo, H. B. ;
Murakami, H. ;
Kuroda, S. .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2006, 89 (12) :3797-3804
[5]   Segmented thermal barrier coatings produced by atmospheric plasma spraying hollow powders [J].
Guo, HB ;
Kuroda, S ;
Murakami, H .
THIN SOLID FILMS, 2006, 506 :136-139
[6]   Plasma spraying of functionally graded hydroxyapatite/Ti-6Al-4V coatings [J].
Khor, KA ;
Gu, YW ;
Quek, CH ;
Cheang, P .
SURFACE & COATINGS TECHNOLOGY, 2003, 168 (2-3) :195-201
[7]   Plasma-sprayed hydroxyapatite (HA) coatings with flame-spheroidized feedstock: microstructure and mechanical properties [J].
Kweh, SWK ;
Khor, KA ;
Cheang, P .
BIOMATERIALS, 2000, 21 (12) :1223-1234
[8]   The thermal cycling behavior of Lanthanum-Cerium Oxide thermal barrier coating prepared by EB-PVD [J].
Ma, W ;
Gong, SK ;
Xu, HB ;
Cao, XQ .
SURFACE & COATINGS TECHNOLOGY, 2006, 200 (16-17) :5113-5118
[9]   On improving the phase stability and thermal expansion coefficients of lanthanum cerium oxide solid solutions [J].
Ma, W ;
Gong, SK ;
Xu, HB ;
Cao, XQ .
SCRIPTA MATERIALIA, 2006, 54 (08) :1505-1508
[10]   EB-PVD process and thermal properties of hafnia-based thermal barrier coating [J].
Matsumoto, Kazuhide ;
Itoh, Yoshiyasu ;
Kameda, Tsuneji .
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 2003, 4 (02) :153-158
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