Microstructures of La2Ce2O7 coatings produced by plasma spray-physical vapor deposition

被引：28

作者：

Zhao, Cong ^{[1
]}

He, Wenting ^{[1
]}

Wei, Liangliang ^{[1
]}

Guo, Hongbo ^{[1
,2
]}

机构：

[1] Sch Mat Sci & Engn, Beijing, Peoples R China

[2] Beihang Univ, Key Lab High Temp Struct Mat & Protect Coatings, Minist Ind & Informat Technol, 37 Xueyuan Rd, Beijing 100191, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2020年 / 40卷 / 04期

基金：

国家重点研发计划;

关键词：

La2Ce2O7 (LC); Plasma spray-physical vapor deposition (PS-PVD); Thermal barrier coatings (TBCs); Quasi-columnar structure; Deposition mechanism; THERMAL BARRIER COATINGS; STABILIZED ZIRCONIA COATINGS; LANTHANUM-CERIUM OXIDE; CERAMIC COATINGS; PVD; EXPANSION;

D O I：

10.1016/j.jeurceramsoc.2019.11.042

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 (LC) coatings were produced by plasma spray-physical vapor deposition (PS-PVD). To achieve the quasi-columnar microstructure, three spray parameters with different net power, spray distance, and carrier gas flow rate were applied. The relationships between the spray parameters and the microstructures were investigated. It was found that the coatings' microstructure is more sensitive to the net power and carrier gas flow rate rather than the spray distance. The corresponding phase and chemical compositions of coatings were studied by X-ray diffraction (XRD) and energy dispersive spectrometer (EDS), respectively. The results indicate that the lattice parameters of LC phases have positive correlations with average atomic La/Ce ratios of the coatings. The regional characteristics of the optimized coating were investigated by transmission electron microscope (TEM). Super-lattice diffraction patterns of TEM revealed that the coating is pyrochlore phase. "Particle-interruption" mechanisms in the quasi-columnar coating were proposed and discussed.

引用

页码：1462 / 1470

页数：9

共 47 条

[1] Phase relation studies in the CeO2-La2O3 system at 1100-1500°C [J].