Preparation and hot corrosion behavior of plasma sprayed nanostructured Gd2Zr2O7-LaPO4 thermal barrier coatings

被引：33
作者：
Guo, Lei [1 ,2 ,3 ]
Li, Mingzhu [1 ,2 ]
He, Sixian [1 ,2 ]
Zhang, Chenglong [1 ,2 ]
Wang, Qi [1 ]
Ye, Fuxing [1 ,2 ,3 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin, Peoples R China
[2] Tianjin Univ, Tianjin Key Lab Adv Joining Technol, Tianjin, Peoples R China
[3] Tianjin Univ, Minist Educ, Key Lab Adv Ceram & Machining Technol, 92 Weijin Rd, Tianjin 300072, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 698卷
基金：
中国国家自然科学基金;
关键词：
Thermal barrier coatings (TBCs); Air plasma spraying (APS); Microstructure; Nanozones; Hot corrosion; STABILIZED ZIRCONIA COATINGS; PHYSICAL VAPOR-DEPOSITION; MECHANICAL-PROPERTIES; PHASE-STABILITY; YSZ COATINGS; DEGREES-C; EB-PVD; TEMPERATURE; CERAMICS; EVOLUTION;
D O I：
10.1016/j.jallcom.2016.12.241
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 30 mol% LaPO4 doped Gd2Zr2O7 (Gd2Zr2O7-LaPO4) thermal barrier coatings (TBCs) were prepared by air plasma spraying (APS). The chemical composition of the coating is close to that of the agglomerated particles used for thermal spray. Nanozones were obviously found in the coating microstructure. Hot corrosion tests were conducted in V2O5 and Na2SO4+V2O5 salts at 900 degrees C to study the corrosion resistance of the coatings. Results indicated that the coating exhibited excellent corrosion resistance in both salts, but it performed better in V2O5 salt. After 4 h corrosion tests, a continuous, dense reaction layer formed on the coating surfaces, effectively arresting further penetration of the molten salt. By comparison, Na2SO4+V2O5 salt corrosion caused thinner reaction layer than V2O5 corrosion, and some NaVO3 trace was found in the inner regions of the coating. Furthermore, the nanozones in the coating have positive function on reducing the molten salts infiltration. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：13 / 19
页数：7
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