High-temperature hot corrosion behavior of gadolinium zirconate by vanadium pentoxide and sodium sulfate in air

被引：39
作者：
Liu, Zhan-Guo [1 ]
Ouyang, Jia-Hu [1 ]
Zhou, Yu [1 ]
Li, Sa [1 ]
机构：
[1] Harbin Inst Technol, Dept Mat Sci, Inst Adv Ceram, Harbin 150001, Heilongjiang, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2010年 / 30卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Gd2Zr2O7; Hot corrosion; V2O5; Na2SO4; THERMAL BARRIER COATINGS; CONDUCTIVITY; YTTRIA; OXIDES; DEGRADATION;
D O I：
10.1016/j.jeurceramsoc.2010.05.002
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：
Gadolinium zirconate (Gd2Zr2O7) prepared by solid state reaction exhibited a defect fluorite-type structure. Reactions between Gd2Zr2O7 ceramic and vanadium pentoxide (V2O5), sodium sulfate (Na2SO4), and V2O5 + Na2SO4 mixture were investigated from 700 to 1000 degrees C in air using an X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). V2O5 reacts with Gd2Zr2O7 to form gadolinium vanadate (GdVO4) and monoclinic zirconia (m-ZrO2) at 900 and 1000 degrees C in air. However, no chemical reaction product between Na2SO4 and Gd2Zr2O7 is found at 900 and 1000 degrees C in air. V2O5 reacts with equal molar Na2SO4 to form sodium vanadate (NaVO3) at 610 degrees C. In the temperature range of 700-1000 degrees C, Na2SO4 + V2O5 mixture reacts with Gd2Zr2O7 in air to form the final reaction products of GdVO4 and m-ZrO2. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2707 / 2713
页数：7
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