论文部分内容阅读
为了研究溅射AlY涂层对合金高温氧化行为的影响,在某镍基合金表面上采用磁控溅射方法制备了AlY涂层,并研究了无涂层镍基合金、溅射AlY涂层的镍基合金以及经过预氧化的溅射AlY涂层镍基合金在1100℃空气中的氧化行为。结果表明,无涂层镍基合金形成了疏松、不完整的Al2O3、Cr2O3以及NiO的混合氧化膜,且发生了内氧化;溅射AlY涂层镍基合金形成了均一的α-Al2O3膜,比表面裸露的镍基合金具有更好的抗氧化性能。溅射AlY涂层试样经预氧化后在试样表面优先形成了保护性γ-Al2O3膜,高温氧化时转变为致密的α-Al2O3膜,因此可进一步提高其抗氧化性能。稀土元素Y改善了Al2O3膜与基体的粘附性,提高合金的抗氧化性能。讨论了氧化膜的形成机理。
In order to study the effect of sputtered AlY coating on the high-temperature oxidation behavior of the alloy, AlY coating was prepared on the surface of a nickel-based alloy by magnetron sputtering and the effects of uncoated nickel-base alloy, sputtered AlY coating The oxidation behavior of Ni-based alloy and pre-oxidized sputtered AlY-coated Ni-based alloy in air at 1100 ℃. The results show that the uncoated Ni-based alloy forms a loose and incomplete mixed oxide film of Al2O3, Cr2O3 and NiO and undergoes internal oxidation. The sputtered AlY coating Ni-based alloy forms a uniform α-Al2O3 film with a ratio Surface bare nickel-based alloys have better oxidation resistance. After the pre-oxidation of the sputtered AlY coating sample, a protective γ-Al2O3 film was preferentially formed on the surface of the sample and was transformed into a dense α-Al2O3 film during high-temperature oxidation so as to further improve its oxidation resistance. The rare earth element Y improves the adhesion of Al 2 O 3 film to the matrix and improves the oxidation resistance of the alloy. The formation mechanism of oxide film is discussed.