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利用Y_2O_3/CeO_2纳米颗粒替代部分Al_2O_3粉作为填充剂,在Ni基体上,600℃低温渗铝10 h,制备了Y_2O_3/CeO_2改性的低温渗铝涂层。作为对比,采用相同的工艺在Ni基体上利用纯Al_2O_3粉制备了普通渗铝涂层。对比研究了Y_2O_3/CeO_2是如何影响氧化铝的相变以及渗铝涂层的1000℃时的循环氧化性能。结果发现,Y_2O_3和CeO_2对θ-α相变具有不同的作用:Y_2O_3抑制θ-Al_2O_3的长大,而CeO_2促进θ-α相变。与普通渗铝涂层相比,Y_2O_3/CeO_2改性的渗铝涂层形成粘附性更好的氧化铝膜,提高了渗铝涂层的循环氧化性能。文中对Y_2O_3/CeO_2是如何影响θ-α相变以及渗铝涂层的循环氧化性能进行了分析。
Y_2O_3 / CeO_2 modified aluminized low temperature coatings were prepared by replacing part of Al_2O_3 powder with Y_2O_3 / CeO_2 nanoparticles as fillers and aluminizing at 600 ℃ for 10 h on Ni substrate. In contrast, the same process was used to prepare common aluminized coatings using pure Al 2 O 3 powder on a Ni matrix. The effect of Y_2O_3 / CeO_2 on the phase transformation of alumina and the cyclic oxidation behavior at 1000 ℃ of aluminized coatings were investigated. The results show that Y_2O_3 and CeO_2 have different effects on θ-α phase transformation: Y_2O_3 suppresses the growth of θ-Al_2O_3 and CeO_2 promotes θ-α phase transition. Compared with the common aluminized coating, Y2O3 / CeO2-modified aluminized coating formed a more adherent alumina film, which improved the cyclic oxidation properties of the aluminized coating. In this paper, the effect of Y_2O_3 / CeO_2 on θ-α phase transformation and the cyclic oxidation properties of aluminized coatings were analyzed.