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OALib Journal期刊
ISSN: 2333-9721
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催化剂对Nb-Ti-Si-Cr基超高温合金表面Si-Zr-Y共渗层组织的影响
DOI: 10.3724/SP.J.1037.2012.00404, PP. 1394-1402
Keywords: Nb-Ti-Si-Cr基超高温合金,Si-Zr-Y共渗层,组织形成,平衡气相分压
Abstract:
使用不同种类催化剂(NaF,NH4F,NH4Cl,NaBr和NaCl)经1250℃保温8h扩散共渗,在新型Nb-Ti-Si-Cr基超高温合金表面制备了Si-Zr-Y共渗层,分析了各共渗层的结构及相组成,并对其组织形成过程进行了讨论.结果表明不同种类催化剂制备的共渗层由外至内均由(Nb,X)Si2(X表示元素Ti,Cr和Hf)外层,(Ti,Nb)5Si4过渡层及富Al,Cr和Y的(Nb,X)5Si3内层组成.在5种催化剂中,采用NaF和NH4F时制备的共渗层较厚、组织致密,且采用NaF时所制备的共渗层中Zr和Y的含量较高;采用NH4Cl,NaBr和NaCl时制备的共渗层较薄且表面分布有大量的孔洞以及ZrO2和HfO2氧化物.渗包内Si的卤化物平衡气相分压较高时制备的共渗层较厚且组织致密;而Zr和Y的卤化物平衡气相分压对其在共渗层中的含量没有显著影响.
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