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On the resistance of rare earth oxide-doped YSZ to high temperature volcanic ash attack
Xia J; Yang L; Wu RT; Zhou YC; Zhang L; Yin BB; Wei YG(魏悦广); Yang, L; Zhou, YC (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Key Film Mat & Applicat Equipment Hunan P, Xiangtan 411105, Hunan, Peoples R China.
Source PublicationSURFACE & COATINGS TECHNOLOGY
2016
Volume307Pages:534-541
ISSN0257-8972
AbstractThermal barrier coatings (TBCs), such as 7-8 wt.% yttria stabilized zirconia (YSZ), are widely used to reduce the temperature of coated materials. However, when a turbine operates in a harsh environment, for example a volcanic ash attack, sand and ash particles ingested by the engine could be deposited on the TBC surfaces as molten calcium-magnesium-alumino-silicate (CMAS). CMAS melts and penetrates into TBCs at high temperatures, which causes a loss of strain tolerance and results in the premature failure of the top coat. It is recognized that the formation of CMAS is inevitable due to exposing the turbine to sand and ash; therefore, CMAS mitigation solutions are among the top challenges for materials scientists. To some extent, CMAS is the biggest weakness of the traditional 7-8YSZ TBC material. The thermochemical interactions between YSZ and real volcanic ash are investigated in this paper as a means to alleviate the volcanic ash attack by understanding the underlying mechanisms. 7YSZ, 0.5Gd-8YSZ and 3Er-7YSZ powders and free-standing plates were prepared, respectively. The effect of the volcanic ash on the three different samples was investigated using an X-ray diffraction, scanning electron microscopy, a scanning transmission electron microscopy, and a differential scanning calorimetry. The phase transformations and reaction of TBCs materials subjected to a volcanic ash attack were examined and the volcanic ash degradation and mitigation mechanisms were discussed. It was found that rare earth-doped YSZ samples suffered less damage from the volcanic ash attack than the standard 7YSZ. The results demonstrate that rare earth-doped YSZ may be effectively utilized to mitigate a volcanic ash attack. (C) 2016 Published by Elsevier B.V.
KeywordThermal Barrier Coatings Rare Earth-doped Ysz Volcanic Ash Cmas
DOI10.1016/j.surfcoat.2016.09.033
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000390622200064
WOS KeywordThermal barrier coatings ; Rare earth-doped YSZ ; Volcanic ash ; CMAS
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Coatings & Films ; Physics, Applied
Funding OrganizationNational Natural Science Foundation of China [51590891, 11272275, 11472237, 11432014]
DepartmentLNM新型材料及结构的多尺度力学
Classification二类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59975
Collection非线性力学国家重点实验室
Corresponding AuthorYang, L; Zhou, YC (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Key Film Mat & Applicat Equipment Hunan P, Xiangtan 411105, Hunan, Peoples R China.
Recommended Citation
GB/T 7714
Xia J,Yang L,Wu RT,et al. On the resistance of rare earth oxide-doped YSZ to high temperature volcanic ash attack[J]. SURFACE & COATINGS TECHNOLOGY,2016,307:534-541
APA Xia J.,Yang L.,Wu RT.,Zhou YC.,Zhang L.,...&Zhou, YC .(2016).On the resistance of rare earth oxide-doped YSZ to high temperature volcanic ash attack.SURFACE & COATINGS TECHNOLOGY,307,534-541.
MLA Xia J,et al."On the resistance of rare earth oxide-doped YSZ to high temperature volcanic ash attack".SURFACE & COATINGS TECHNOLOGY 307(2016):534-541.
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