High temperature cyclic oxidation behavior of Y2O3-ZrO2 thermal barrier coatings irradiated by high-intensity pulsed ion beam

• Published in: Journal of Central South University of Technology. Science & technology of mining and metallurgy Vol. 16; no. 1; pp. 13 - 17
• Main Authors: Wang, Yi-qi, Lei, Ming-kai, Afsar, A. M., Song, J. I.
• Format: Journal Article
• Language: English
• Published: Heidelberg Central South University 01.02.2009
• Subjects: Engineering; Metallic Materials; thermal barrier coating; cyclic oxidation; ZrO; electron beam physical vapor deposition; Y; oxidation resistance; high-intensity pulsed ion beam; O
• ISSN: 1005-9784; 1993-0666
• DOI: 10.1007/s11771-009-0002-x

The high-temperature oxidation resistance behavior of 7% (mass fraction) Y 2 O 3 -ZrO 2 thermal barrier coatings (TBCs) irradiated by high-intensity pulsed ion beam (HIPIB) was investigated under the cyclic oxidation condition of 1 050 °C and 1 h. The columnar grains in the TBCs disappear after the HIPIB irradiation at ion current densities of 100–200 A/cm 2 and the irradiated surface becomes smooth and densified after remelting and ablation due to the HIPIB irradiation. The thermally grown oxide (TGO) layer thickness of the irradiated TBCs is smaller than that of the original TBCs. After 15 cycles, the mass gains of the original TBCs and those irradiated by ion current densities of 100 and 200 A/cm 2 due to the oxidation are found to be 0.8–0.9, 0.6–0.7, and 0.3–0.4 mg/cm 2 , respectively. The inward diffusion of oxygen through the irradiated TBCs is significantly impeded by the densified top layer formed due to irradiation, which is the main reason for the improved overall oxidation resistance of the irradiated TBCs.