High temperature cyclic oxidation behavior of Y2O3-ZrO2 thermal barrier coatings irradiated by high-intensity pulsed ion beam |
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| Authors: | Yi-qi Wang Ming-kai Lei A. M. Afsar J. I. Song |
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| Affiliation: | (1) Department of Mechanical Engineering, Changwon National University, Changwon, 641-773, Korea;(2) School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China |
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| Abstract: | The high-temperature oxidation resistance behavior of 7% (mass fraction) Y2O3-ZrO2 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/cm2 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/cm2 due to the oxidation are found to be 0.8–0.9, 0.6–0.7, and 0.3–0.4 mg/cm2, 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. Foundation item: Projects supported by The 2nd Stage of Brain Korea and Korea Research Foundation |
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| Keywords: | Y2O3 ZrO2 thermal barrier coating high-intensity pulsed ion beam electron beam physical vapor deposition oxidation resistance cyclic oxidation |
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