在M38镍基高温合金上电镀Pd-20 mass%Ni合金，采用低压固体粉末包埋渗铝方法制备钯改性铝化物涂层，XRD分析表明，涂层主要由β-(Ni,Pd)Al相组成.利用TGA、SEM等方法，研究了涂层在800℃、900℃和1100℃的高温氧化行为表明，β-(Ni,Pd)Al涂层恒温氧化动力学遵循抛物线规律；1000℃氧化动力学则不遵循抛物线规律.在800℃和900℃下，β-(Ni,Pd)Al 涂层表面氧化产物包括α-Al2O3、θ-Al2O3和少量的γ-Al2O3；在1000℃下，涂层表面存在α-Al2O3和θ-Al2O3两种氧化物；在1100℃下，涂层表面氧化产物主要是α-Al2O3.此外，在各温度下涂层表面的氧化产物中都含有少量的TiO2，随着温度升高，其含量增加.
(Ni,Pd)Al coating prepared by low pressure pack cementation on nickel-based superalloy M38 predeposited with Pd-20mass% Ni alloy,is composed of β-(Ni,Pd)Al phase.The isothermal oxidation behavior of the coating at 800℃-1100℃ was investigated by TGA、SEM.It was found that the oxidation kinetics accorded preferably with parabolic law at 800℃,900℃ and 1100℃,but not at 1000℃.θ-Al2O3 and α-Al2O3 were the main oxidation product and γ-Al2O3 was very little at 800℃ and 900℃,θ-Al2O3 and α-Al2O3 at 1000℃,and only α-Al2O3 at 1100℃.In addition,there was a little TiO2 on the coating surface,and the content of TiO2 was increasing with rising of the temperature.
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