CaO-MgO-Al2O3-SiO2 (CMAS) Corrosion of Gd2Zr2O7 and Sm2Zr2O7. Issue 10 (8th August 2016)

• Record Type: Journal Article
• Authors: Wang, Honglong; Bakal, Ahmet; Zhang, Xingxing; Tarwater, Emily; Sheng, Zhizhi; Fergus, Jeffrey W.
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 10(2016)
• Page Start: C643
• Page End: C648
• Publication Date: 2016-08-08
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0301610jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Ceramic thermal barrier coatings are applied to superalloys used in gas turbine engineering to increase the operating temperature and the energy conversion efficiency. However, dust consisting of CaO-MgO-Al2 O3 -SiO2 (CMAS) from the air can be injected into the engines and corrode the thermal barrier coatings. Lanthanide zirconates are promising materials in thermal barrier coatings due to their low thermal conductivities, good phase stability and good corrosion resistance. However, the corrosion resistance mechanism of CMAS on lanthanide zirconates is still not clearly understood. In this work, the corrosion mechanism of Gd2 Zr2 O7 and Sm2 Zr2 O7 in CMAS is studied. The results show that the CMAS can easily react with lanthanide zirconate thermal barrier coatings to form a dense layer, which can resist further corrosion.