Effect of annealing treatment on cyclic-oxidation of electrodeposited Ni-Al nanocomposite

来源期刊：中国有色金属学报(英文版)2011年第2期

论文作者：周月波 张海军

文章页码：322 - 329

关键词：电镀；纳米涂层；循环氧化

Key words：electrodeposition; nanocomposite; cyclic oxidation

摘    要：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。

Abstract: An electrodeposited Ni-Al nanocomposite having a nanocrystalline Ni matrix dispersing Al nanoparticles was annealed in vacuum at 500 °C for different time (3, 5 and 8 h, respectively). The results show that the annealing treatment leads to the reaction of Ni and Al to form intermetallics and the coarsened Ni grains that are doped with a certain amount of Al atoms diffused from the nanoparticles. Cyclic oxidation in air at 1 000 °C indicates that the scale spallation resistance of the annealed Ni-Al nanocomposite increases with the increase of annealing time, due to prevention of the composite intergranular cracking during the cycling, reduction of numerous surface NiO nodules formed on the scale spalled area and prevention of internal oxidation.