Hot corrosion behavior of Sc2O3-Y2O3-ZrO2 thermal barrier coatings in presence of Na2SO4 + V2O5 molten salt

被引：80
作者：
Liu, Huai-fei [1 ]
Xiong, Xiang [2 ]
Li, Xiao-bin [1 ]
Wang, Ya-lei [2 ]
机构：
[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Peoples R China
[2] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
来源：
CORROSION SCIENCE | 2014年 / 85卷
基金：
中国国家自然科学基金;
关键词：
Ceramic; SEM; XRD; Hot corrosion; YTTRIA-STABILIZED ZIRCONIA; TETRAGONAL PHASE-STABILITY; HIGH-TEMPERATURE CORROSION; EVOLUTION; CONDUCTIVITY; RESISTANCE; SCANDIA; YSZ;
D O I：
10.1016/j.corsci.2014.04.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Sc2O3, Y2O3-stabilized ZrO2 (ScYSZ) thermal barrier coatings (TBCs) were prepared on nickel-based super-alloys by air plasma spraying. Hot corrosion behavior of the ScYSZ TBCs was investigated in presence of Na2SO4 + V2O5 salt at 1000 degrees C. Results show that the ScYSZ coating exhibits superior chemical stability and improved phase stability in comparison with traditional YSZ coating. During corrosion, the destabilization of ScYSZ is attributed to the deficiency of stabilizers resulted from the synergic mineralization effect of vanadium-containing compounds. The tetragonal-to-monoclinic phase transformation of zirconia can induce the formation of cracks in ScYSZ coating, which is responsible for the degradation of the TBCs. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：87 / 93
页数：7
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