Evaluation of microstructural evolution of thermal barrier coatings exposed to Na2SO4 using impedance spectroscopy
Evaluation of microstructural evolution of thermal barrier coatings exposed to Na2SO4 using impedance spectroscopy
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DOI：
10.1016/j.corsci.2010.12.023
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发表时间：
2011-04
影响因子：
8.3
通讯作者：
Hui Huang;Chao Liu;L. Ni;Chungen Zhou
中科院分区：
文献类型：
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作者：
Hui Huang;Chao Liu;L. Ni;Chungen Zhou
采用阻抗谱技术研究了热障涂层在950°C Na 2SO 4作用下的显微组织演变。结果表明，氧化钇稳定氧化锆面漆的电阻和电容随腐蚀时间的延长而增大。热生长氧化物（TGO）的电阻从20到60 h缓慢下降，这表明TGO的组成变化不大。TGO的电阻从60 h到100 h的快速下降可能对应于TGO的组成随腐蚀时间从a-Al_2 O_3到更导电的NiO和Ni（Cr，Al）_2 O_4的变化。
Impedance spectroscopy as a non-destructive evaluation technique was employed to study the microstructural evolution of thermal barrier coatings exposed to Na2SO4at 950°C. The results showed that the resistance and capacitance of yttria-stabilized zirconia top coat increased with corrosion time. The resistance of thermally growth oxide (TGO) from 20 to 60h decreased slowly, which indicates there is little change in the composition of TGO. The fast decrease in the resistance of TGO from 60 to 100h may correspond to the compositional change of TGO from a-Al2O3to more conductive NiO and Ni(Cr, Al)2O4with corrosion time.