【摘要】 采用低压固体粉末包埋渗铝方法在M38镍基高温合金上制备钯改性铝化物涂层,利用热重分析(TGA)、扫描电镜(SEM)、X射线衍射(XRD)等方法,研究其1100℃的高温氧化行为,结果表明,(Ni,Pd)Al涂层的恒温氧化动力学近似符合抛物线氧化规律。与NiAl涂层相比,(Ni,Pd)Al涂层具有更优良的抗高温氧化性能,退化过程与NiAl涂层类似,添加改性元素Pd有利于稳定β相,延缓涂层的退化,有益于提高铝化物涂层的抗高温氧化性能。更多还原

【Abstract】 The 1100 ℃ oxidation behavior of (Ni,Pd)Al coating prepared by low pressure pack cementation on the nickel-based superalloy M38, was studied by thermal gravimetric analysis (TGA), X-ray diffraction (XRD), SEM. The results show that the oxidation kinetics of (Ni, Pd)Al coating obeys parabolic law and its performance of high temperature oxidation resistance is better than that of plain aluminide coating. The degradation mechanism is similar to NiAl. The addition of Pd is in favor of stabilizing the β phase, retarding the degradation of coating, and increasing the high temperature oxidation resistance of coating.更多还原