目的 提高Nb-TiAl合金的抗高温氧化性能.方法 采用NaF为催化剂、1080℃下Si-Y扩散共渗5h的方法,在高Nb-TiA1表面制备了Y改性硅化物渗层,利用SEM、EDS和XRD分析了渗剂中Y2O3含量对共渗层组织及相组成的影响.结果 采用不同含量Y2O3所制备的Si-Y共渗层具有多层复合结构,共渗层的厚度随Y元素的添加呈先增大后减小的趋势,共渗层的内层均由γ-TiAl相组成;当渗剂中Y2O3含量为2％和3％(质量分数)时,共渗层的外层主要为(Ti,Nb)Si2相,中间层分为上下两层,分别为(Ti,Nb)5Si4相和(Ti,Nb)sSi3相,其中2％Y2O3的Si-Y共渗层有一层富A1的(Ti,Nb)5Si4和(Ti,Nb)5Si3相组成的浅表层;当渗剂中Y2O3含量为0％、1％和5％时,共渗层外层以(Ti,Nb)5Si4相为主,中间层主要为(Ti,Nb)5Si3相.结论 稀土Y元素质量分数为2％～3％时具有明显的促渗作用,且获得的Si-Y渗层组织结构致密,但添加过量的稀土元素会抑制Si元素的吸附与扩散,使得Si-Y共渗层中产生较多的孔洞,同时渗层的组织结构发生了改变.
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