【摘要】 以Al(NO3)3乙醇溶液为电解液,采用阴极微弧放电沉积方法,在TiAl合金表面制备连续的Al2O3薄膜,并对膜的结构与性能进行研究。利用扫描电镜(SEM)观察到样品表面分布着熔融状颗粒,颗粒的平均直径约20μm,颗粒中间有小孔存在。X射线衍射(XRD)分析表明氧化膜的相成分主要为α-Al2O3和γ-Al2O3相,还有少量的ε-Al2O3相;氧化膜中α-Al2O3和γ-Al2O3的相对含量随着制备电压改变而变化。显微划痕实验测得膜与TiAl基体之间结合力大于20 N,表明制得的氧化膜与基体有良好的结合力。900℃的高温氧化实验表明氧化膜能够有效地提高基体的抗氧化性能。更多还原

【Abstract】 Continuous Al2O3 coating was fabricated on TiAl alloy by cathodic microarc deposition method with Al(NO2)3 ethanol solution as electrolyte.Morphology and constitution structure were analyzed by X-ray diffraction(XRD) and scanning electronic microscope(SEM).The experimental results showed that the coating is mainly consisted of α-Al2O3 and γ-Al2O3 phases besides low contents of ε-Al2O3 phase,the adhesive force between the coating and substrate is over 20 N measured by micro-scratch tester.Isothermal oxidation at 900 ℃ revealed that the oxidation resistance of the coated TiAl is improved.更多还原