Corrosion behavior of Sc2O3–Y2O3 co-stabilized ZrO2 thermal barrier coatings with CMAS attack. Issue 12 (15th August 2019)

• Record Type: Journal Article
• Authors: Fan, W.; Bai, Y.; Liu, Y.F.; Kang, Y.X.; Wang, Y.; Wang, Z.Z.; Tao, W.Z.
• Is Part Of: Ceramics international. Volume 45:Issue 12(2019)
• Page Start: 15763
• Page End: 15767
• Publication Date: 2019-08-15
• Subjects: Thermal barrier coating -- Sc2O3–Y2O3–ZrO2 -- Corrosion -- CMAS; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.05.063
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Traditional viewpoints state that defects, such as pores or cracks, that generally exist in plasma sprayed thermal barrier coatings (TBCs) can provide fast infiltration channels for molten calcia-magnesia-alumino-silicate (CMAS). In contrast with this viewpoint, results from this study suggest that the effect of defects on the CMAS infiltration of the yttria stabilized zirconia (YSZ) coating is limited, even though the dense YSZ bulk material still cannot inhibit the infiltration of CMAS. However, a few additions of Sc2 O3 can significantly improve the CMAS resistance of the YSZ coating owing to the lower solubility of Sc 3+ in the CMAS. Our findings provide key insights for the development of CMAS-resistant TBCs.