Hot corrosion studies on plasma sprayed bi-layered YSZ/La2Ce2O7 thermal barrier coating fabricated from synthesized powders

被引：32

作者：

Lashmi, P. G. ^{[1
]}

Ananthapadmanabhan, P. V. ^{[2
]}

Chakravarthy, Y. ^{[2
]}

Unnikrishnan, G. ^{[3
]}

Balaji, N. ^{[1
]}

Aruna, S. T. ^{[1
]}

机构：

[1] CSIR, Nat Aerosp Labs, Surface Engn Div, Bangalore 560017, Karnataka, India

[2] Bhabha Atom Res Ctr, Laser & Plasma Technol Div, Plasma Spray Technol Sect, Bombay 400085, Maharashtra, India

[3] Natl Inst Technol, Polymer Sci & Technol Lab, Calicut 673601, Kerala, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 711卷

关键词：

Thermal barrier coating (TBC); Bilayer; Atmospheric plasma spraying (APS); Hot corrosion; Microstructure; CYCLING BEHAVIOR; ZIRCONIA COATINGS; LA2CE2O7; OXIDE; TRANSITION; STABILITY;

D O I：

10.1016/j.jallcom.2017.04.022

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：

La2Ce2O7 (LCO) with a pyrochlore structure has been considered as a propitious thermal barrier coating (TBC) system possessing high temperature (>1200 degrees C) phase stability. In the present study, double ceramic layer of yttria stabilized zirconia (YSZ) and lanthanum cerium oxide (La2Ce2O7, LCO) TBCs are fabricated by atmospheric plasma spraying (APS). Individual LCO and 8YSZ and bilayered LCO/YSZ coatings are developed using flowable YSZ and LCO powders synthesized by co-precipitation and combustion routes respectively and are characterized for phase and microstructure. The coatings subjected to hot corrosion (Na2SO4+V2O5 salt at 910 degrees C for 30 h) are characterized by X-ray Diffractometry and Scanning Electron Microscopy and Energy Dispersive X-Ray Spectroscopy. XRD shows the phase transformation of YSZ from tetragonal to monoclinic zirconia accompanied by the formation of LaVO4 and YVO4 as hot corrosion products. Considerable decrease in volume fraction of monoclinic zirconia phase has been observed for bilayered LCO/YSZ coating compared to 8YSZ single layer. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：355 / 364

页数：10

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