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℃～1100℃的初期高温氧化行为.结果表明 ，80 0℃、900℃和1100℃下，氧化动力学遵循抛物线规律，1000℃则不是；在800℃和900℃中等 温度下，(Ni,Pd)Al涂层表面氧化产物除θ-Al2O3和α-Al2O3外，还含有 少量的γ- Al2O3；在1000℃下，涂层表面存在θ-Al2O3和α-Al2O3两种氧化物 ；在110 0℃下，涂层表面氧化产物主要是α-Al2O3.另外，在各温度下涂层表面的氧化产物 中都含有少量的TiO2，并且随着温度升高，含量增加.
(Ni,Pd)Al coating prepared by low pressure pack cem entation on the nickel-based superalloy M38 predeposited Pd-20mass%Ni alloy,is c omposed by β-(Ni,Pd)Al phase,and the earlier stage isothermal oxidation beh avior is investigated by TGA、SEM at 800℃-1100℃.It is found that oxidation ki netics accord preferably with parabolic law at 800℃，900℃and 1100℃,but not at 1000℃.θ-Al2O3 and α-Al2O3 are mainly the oxidation product a nd γ-Al2O3 is very little at 800℃～900℃,θ-Al2O3 and α-A l2O3 at 1000℃,and only α-Al2O3 at 1100℃.In addition,a little of T iO2 exists on the coating surface,and the content of TiO2 is increases with rising of the temperature.
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