Application of biofuel impurities and effect on the hot corrosion of yttria-stabilized zirconia thermal barrier coatings

SURFACE & COATINGS TECHNOLOGY

卷:358

Article

Velasco, Jorge H. Ramirez¹  Kilaz, Gozdem²  Kenttamaa, Hilkka I.³  Trice, Rodney W.¹ 

[1] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA

[2] Purdue Univ, Sch Engn Technol, W Lafayette, IN 47907 USA

[3] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA

关键词: YSZ;    TBC;    CMAS;    Biofuel;    Corrosion;   

DOI  :  10.1016/j.surfcoat.2018.10.019

来源: Elsevier

【 摘 要 】

The contaminants found in biofuels include alkali and alkaline metals along with sulfur, phosphorus and silicon oxides. Furthermore, while calcium-magnesium-aluminum silicates (CMAS) are typically ingested as particulate in middle-east theaters, the impurity list in biofuels includes the necessary elements to form CMAS without exposure to any environment. This is significant as CMAS is particularly destructive for operating temperatures above its melting temperature (similar to 1250 degrees C), particularly affecting the lifetime of 7 wt%Y2O3-ZrO2 (YSZ) thermal barrier coatings (TBCs). In the work reported currently, solutions containing the individual and unreacted constituents of CMAS were prepared and sprayed onto either air plasma sprayed (APS) or electron beam physically deposited (EB-PVD) TBCs and subsequently subjected to dynamic heating up to 1400 degrees C, simulating the deposit and thermal conditions of the biofuel impurities during combustion. Microstructure analysis revealed that the individual constituents of CMAS accelerated degradation of the TBCs compared to the same samples heated without impurities.

【 授权许可】

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