Degradation of Thermal Barrier Coatings by Fuel Impurities and CMAS: Thermochemical Interactions and Mitigation Approaches

被引：55

作者：

Mohan, Prabhakar ^{[1
,2
]}

Patterson, Travis ^{[1
,2
]}

Yao, Bo ^{[1
,2
]}

Sohn, Yongho ^{[1
,2
]}

机构：

[1] Univ Cent Florida, AMPAC, Orlando, FL 32816 USA

[2] Univ Cent Florida, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA

来源：

JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2010年 / 19卷 / 1-2期

关键词：

air plasma spray; barrier overlay coatings; CMAS sand; environmental degradation; thermal barrier coatings; vanadium pentoxide; ELECTROPHORETIC DEPOSITION; VANADIUM; TEMPERATURE; DURABILITY; CORROSION;

D O I：

10.1007/s11666-009-9424-0

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Degradation of free-standing yttria-stabilized zirconia (YSZ) and CoNiCrAlY coatings (300 mu m) due to V(2)O(5) and a laboratory-synthesized CMAS was investigated at temperatures up to 1400 A degrees C. Reactions, phase transformations, and microstructural development in coatings were examined by using x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The molten deposits destabilized the YSZ and reacted with the thermally grown oxide with various phase transformations and reaction product formation. A dense, continuous environmental barrier overlay, based on oxides, applied by electrophoretic deposition was effective in mitigating the molten deposit attack. Enriching CMAS composition with Al promoted the crystallization of anorthite platelets and MgAl(2)O(4) spinel, and mitigated CMAS ingression. EPD MgO overlay was also effective in protection against V(2)O(5) melt by formation of magnesium vanadates. EPD alumina overlay deposited on thermal barrier coatings with APS 8YSZ and bond-coated IN939 superalloy retained its adhesion and structural integrity after prolonged furnace thermal cycle test at 1100 A degrees C.

引用

页码：156 / 167

页数：12

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