利用包埋渗法在新型铌基超高温合金表面制备了铝改性的硅化物抗氧化涂层,分析了涂层的相组成、结构及其组织形成过程.涂层制备采用先在1150℃包埋渗硅4h,然后再于800～1000℃包埋渗铝4h的方法.结果表明:渗硅后涂层的相组成为(Nb,X)Si2(X代表Ti,Cr和Hf元素);再于各温度包埋渗铝后,(Nb,X)Si2层中的平均铝含量随包埋渗铝温度的升高而增加,最高可达10.84at%;当包埋渗铝温度为860～1000℃时会在渗硅层与基体间形成新的铌铝金属间化合物层,且渗入(Nb,X)Si2层中的铝会在局部形成Nb3Si3Al2相.
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