论文部分内容阅读
The electrodeposited Y2O3-dispersedγ-Ni+γ′-Ni3Al coatings on Ni substrates were developed by the conversion of electrodeposited Ni-Al-Y2O3 films with dispersed Al microparticles in Ni matrix into Ni3Al by vacuum annealing at 800℃for 3 h. For comparison,Y2O3-freeγ-Ni+γ′-Ni3Al coatings with a similar Al content were also prepared by vacuum annealing the electrodeposited microparticle-dispersed composite coatings of Ni-Al under the same condition.SEM and TEM characterizations show that the electrodeposited Y2O3-dispersedγ+γ′coatings exhibit finer grains,a more homogeneous distribution ofγ′,and a narrowedγ′phase spacing compared with the electrodeposited Y 2 O3-freeγ+γ′coatings.The oxidation at 1 000℃shows that the addition of Y2O3 significantly improves the oxidation resistance of the electrodepositedγ+γ′coatings.The effect of Y2O3 particles on the microstructure and oxidation behavior of the electrodepositedγ+γ′coatings was discussed in detail.
The electrodeposited Y2O3-γγ-Ni + γ’-Ni3Al coatings on Ni films were developed by the conversion of electrodeposited Ni-Al-Y2O3 films with dispersed Al microparticles in Ni matrix into Ni3Al by vacuum annealing at 800 ℃ for 3 h. , Y2O3-free γ-Ni + γ’-Ni3Al coatings with a similar Al content were also prepared by vacuum annealing the electrodeposited microparticle-dispersed composite coatings of Ni-Al under the same conditions. SEM and TEM characterizations show that the electrodeposited Y2O3-yielded γ + γ’coatings exhibit finer grains, a more homogeneous distribution of γ ’, and a narrowedγ’phase spacing compared with the electrodeposited Y 2 O3-freeγ + γ’coatings.The oxidation at 1 000 ° C shows that the addition of Y2O3 significantly improves the oxidation resistance of the electrodepositedγ + γ’coatings.The effect of Y2O3 particles on the microstructure and oxidation behavior of the electrodepositedγ + γ’coatings was discussed in detail.