中文摘要：

采用电子束物理气相沉积（EB—PVD）方法在DZ125镍基高温合金上制备了CoCrAlY涂层，经过高温氧化扩散处理后，通过物理方法去除不同深度的涂层，采用相同的工艺重新制备了CoCrAlY涂层．研究了高温扩散过程中再涂覆CoCrAlY涂层与DZ125合金基体界面的互扩散行为及涂层的高温氧化行为．结果表明，去除涂层的深度对再涂覆涂层与合金界面的扩散行为以及涂层的高温氧化性能有重要影响．再涂覆涂层经高温氧化后形成的贫A1区厚度均小于首次涂覆涂层，且去除的深度越浅，贫A1区的厚度越薄．当涂层去除至互扩散区（IDz）底部时，再涂覆涂层经高温氧化后形成的IDz厚度与首次涂覆涂层相当，且氧化膜厚度较薄．

英文摘要：

The thermal barrier coatings （TBCs） are widely used in gas turbines which could lower the surface operating temperature and improve the service life of the coated part component. When repair or refurbishment of these coated components, it is necessary to remove the coating and replace it with a new coatings. The CoCrAIY coatings were deposited by EB-PVD on the directionally solidified nickel-based superalloy DZI25. The coatings were removed via physical methods in varying thicknesses and recoated subsequently. The results showed that the depth of the removal had a significant impact on the inter-diffusion behavior as well as the oxidation resistance. The thickness of Al-depleted zone formed in the recoated coatings after oxidation are thinner than the first coated coatings. Moreover, the more the coating was removed, the thinner the Al-depleted zone was formed. The recoated coatings deposited on the substrate removed the entirely inter-diffusion zone （IDZ） showed the best oxidation resistance, and the IDZ formed after oxidation was similar to the first coated coatings.