A comparative study on hot corrosion resistance of three types of thermal barrier coatings:: YSZ, YSZ + Al2O3 and YSZ/Al2O3

被引：215

作者：

Afrasiabi, Abbas ^{[2
]}

Saremi, Mohsen ^{[2
]}

Kobayashi, Akira ^{[1
]}

机构：

[1] Osaka Univ, Welding & Joining Res Inst, Osaka 5670047, Japan

[2] Univ Tehran, Fac Engn, Sch Met & Mat Engn, Tehran, Iran

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 478卷 / 1-2期

关键词：

hot corrosion; TBC; plasma spray; YSZ/Al2O3; composite;

D O I：

10.1016/j.msea.2007.06.001

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

Hot corrosion is one of the main destructive factors in thermal barrier coatings (TBCs) which comes as a result of molten salt effect on the coating-gas interface. Hot corrosion behavior of three types of plasma sprayed TBCs was evaluated: (a) usual YSZ (yttria-stabilized zirconia), (b) particle composite of (YSZ + Al2O3) and (c) layer composite of (YSZ/Al2O3) in which Al2O3 was as a topcoat on YSZ layer. Hot corrosion tests were carried out on the surface of coatings in molten salt (Na2SO4 + V2O5) at 1050 degrees C for 40h. Spallation was observed in YSZ and (YSZ + Al2O3) coatings. The formation of monoclinic ZrO2 and YVO4 Crystals as hot corrosion products caused the degradation of mentioned TBCs. Although monoclinic ZrO2 decreased in (YSZ + Al2O3) in comparison with usual YSZ, dendritic YVO4 crystals had main role in degradation of (YSZ + Al2O3) coating. Alumina coating as outer layer in YSZ/Al2O3 reduced the penetration of molten salt into YSZ and resulted in the further resistance of TBC against hot corrosion, because the hot corrosion products considerably decreased in YSZ/Al2O3. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：264 / 269

页数：6

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