研究在500℃真空扩散不同时间条件下的扩散合金化对Ni-Al纳米复合镀层的结构与抗循环氧化性能的影响。结果表明:扩散不仅导致Ni-Al纳米复合镀层的基体Ni晶粒粗化,还导致Al固溶在基体Ni中,Ni与Al之间形成金属化合物;随着扩散合金化时间的延长,Ni-Al合金涂层中的空洞减少,从而减少了合金涂层在循环氧化过程中出现的穿透性裂纹和内氧化,抑制了氧化膜剥落区瘤状NiO的形成,提高了Ni-Al合金涂层的抗循环氧化性能。 The effects of diffusion alloying on the structure and cyclic oxidation resistance of Ni-Al nano-composite coatings were investigated at 500 ℃ for different time. The results show that diffusion not only results in the coarsening of the Ni grains in the matrix of Ni-Al nano-composite coating, but also leads to the solid solution of Al in the matrix Ni and the formation of metal compounds between Ni and Al. With the diffusion alloying time prolonging, Al alloy coating reduces voids, thereby reducing the alloy coating in the cyclic oxidation process occurs through the penetration cracks and internal oxidation, inhibited the oxide film peeling off the formation of tumor NiO, Ni-Al alloy coating to improve the coating Anti-cyclic oxidation performance.