Isothermal oxidation resistance and microstructure evolution of VPS-TiAlCrY coating on TiAl single crystals at 1100–1200 °C. (November 2022)

• Record Type: Journal Article
• Authors: Han, Dijuan; Pan, Yangyang; Niu, Yaran; Chen, Yang; Qi, Zhixiang; Pan, Xi; Zheng, Xuebin; Chen, Guang
• Is Part Of: Corrosion science. Volume 208(2022)
• Publication Date: 2022-11
• Subjects: TiAlCrY coating -- TiAl single crystals -- Vacuum plasma spray -- Oxidation resistance -- Microstructure evolution; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110664
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: TiAlCrY coating was fabricated on TiAl single crystals by vacuum plasma spray (VPS) technique to investigate the oxidation resistance and microstructure evolution via isothermal oxidation tests at 1100 and 1200 ℃, respectively. The results indicated that the oxidation resistance of TiAlCrY coating was excellent with the maximum spallation degree of oxide layer extremely below the critical value of coating failure. The oxide growth kinetic curves of the TiAlCrY coating complied well with parabolic law, and the oxidation rate constants were comparable to those of typical MCrAlY coatings on nickel superalloys. In particular, the strong α-Al2 O3 formation ability in the initial oxidation process and the great chemical compatibility at coating-substrate interface contributed to the durable oxidation resistance of TiAlCrY coating. This work highlights the potential application of VPS-TiAlCrY coating for TiAl single crystals at 1100–1200 ℃. Highlights: It is the first time to investigate the oxidation resistance of VPS-TiAlCrY coating on TiAl single crystals. The oxidation resistance of TiAlCrY coating on TiAl single crystals was excellent. The chemical compatibility at TiAlCrY-TiAl interface was better than that of the conventional MCrAlY coated TiAl systems.