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论文类型：期刊论文

发表时间：2009-02-01

发表刊物：JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：16

期号：1

页面范围：13-17

ISSN号：1005-9784

关键字：Y2O3; ZrO2; thermal barrier coating; high-intensity pulsed ion beam; electron beam physical vapor deposition; oxidation resistance; cyclic oxidation

摘要：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 degrees 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.