研究了包埋共渗温度和渗剂中Al含量对Nb-Ti-Si基超高温合金表面Si-Al-Y共渗层显微组织的影响.采用组成为10Si-10Al-3Y-5NaF-72Al2O3(wt%)的渗剂,分别在1050、1080和1150℃保温10h所制备的渗层具有相似的结构,由(Nb,X)Si2(X代表Ti,Cr和Hf)外层、(Nb,X)5Si3中间层、(Cr,Al)2(Nb,X)和(Nb,X)Al3相构成的次内层及(Nb,X)2Al内层组成.在1050℃/10h所制备渗层的外层和中间层的组成相随渗剂中Al含量增加而变化,但次内层和内层的组成相不改变.当渗剂中Al含量为15wt%时,渗层外层仍为(Nb,X)Si2,但中间层却件1(Nb,X)Al3和(No,X)5Si3两相组成;当渗剂中Al含量为20wt%时,渗层外层转变为由(Nb,X)Si2和(Nb,X)3Si5Al2两相组成.对1050℃/10h所制备的渗层(采用Al含量为15wt%的渗剂)进行1250℃/0.5h氧化,氧化膜厚度约为10pm,主要由Al2O3、TiO2和SiO2组成.
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