Nanomechanical characterization of nanostructured La2(Zr0.75Ce0.25)2O7 thermal barrier coatings by nanoindentation

被引：29
作者：
Zhou, F. F. [1 ,2 ,3 ]
Xu, L. P. [2 ,3 ]
Deng, C. M. [2 ,3 ]
Song, J. B. [2 ,3 ]
Deng, C. G. [2 ,3 ]
Wang, Y. [1 ]
Liu, M. [2 ,3 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Dept Mat Sci, Harbin 150001, Peoples R China
[2] Guangdong Inst New Mat, Natl Engn Lab Modern Mat Surface Engn Technol, Guangzhou 510651, Peoples R China
[3] Guangdong Inst New Mat, Key Lab Guangdong Modern Surface Engn Technol, Guangzhou 510651, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2020年 / 505卷
基金：
中国国家自然科学基金;
关键词：
Nanostructured La-2(Zr0.75Ce0.25)(2)O-7 coatings; Nanomechanical properties; Atmospheric plasma spraying; Indentation work; Microhardness dissipation parameter (MDP); MECHANICAL-PROPERTIES; THERMOPHYSICAL PROPERTIES; BONDING STRENGTH; HEAT-TREATMENT; ABRASIVE WEAR; BEHAVIOR; CONDUCTIVITY; TEMPERATURE; RESISTANCE; SURFACE;
D O I：
10.1016/j.apsusc.2019.144585
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Nanostructured rare-earth zirconates materials have a great potential in next generation ultra high temperature thermal barrier coatings. In this work, the nanostructured La-2(Zr0.75Ce0.25)(2)O-7 coatings were fabricated by atmospheric plasma spraying using as-prepared nanostructured La-2(Zr0.75Ce0.25)(2)O-7 spherical feedstocks and nanomechanical properties of coatings were characterized by nanoindentation in detail. Results indicate that the grain growth of nanostructured coating is not obvious compared with feedstocks. The elastic modulus and nanohardness of coatings, which are sensitive to non-molten zones, are 116.483 +/- 19.236 GPa and 5.715 +/- 1.656 GPa, respectively. The elastic indentation work is 11.465 +/- 0.750 nJ and the plastic indentation work is 23.981 +/- 5.035 nJ. The parameter of energy dissipation during plastic deformation (microhardness dissipation parameter, MDP) is 0.672 +/- 0.042, indicating that outstanding properties under wear conditions for nanostructured La-2(Zr0.75Ce0.25)(2)O-7 coatings.
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页数：6
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