Nb-Ti-Si基超高温合金表面Si-Al-Y共渗层的组织形成
作者： Chao-Feng ZHANG , Xi-Ping GUO
DOI: 10.3724/SP.J.1077.2010.01209
关键词:
摘要: 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-72Al 2 O 3 (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)Si (X代表Ti, Cr和Hf)外层、(Nb,X) 5 Si 中间层、(Cr,Al) (Nb,X)和(Nb,X)Al 相构成的次内层及(Nb,X) Al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)Si , 但中间层却由(Nb,X)Al 和(Nb,X) 两相组成; 当渗剂中Al含量为20wt%时, 渗层外层转变为由(Nb,X)Si Al 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10μm, 主要由Al 、TiO 和SiO 组成.
chinasciencejournal.com参考文章(10)
Jie Geng, Panos Tsakiropoulos, Guosheng Shao, A study of the effects of Hf and Sn additions on the microstructure of Nbss/Nb5Si3 based in situ composites Intermetallics. ,vol. 15, pp. 69- 76 ,(2007) , 10.1016/J.INTERMET.2006.03.001
Xiaodong Tian, Xiping Guo, Structure and oxidation behavior of Si-Y co-deposition coatings on an Nb silicide based ultrahigh temperature alloy prepared by pack cementation technique Surface & Coatings Technology. ,vol. 204, pp. 313- 318 ,(2009) , 10.1016/J.SURFCOAT.2009.07.031
A. Hellwig, M. Palm, G. Inden, Phase equilibria in the AlNbTi system at high temperatures Intermetallics. ,vol. 6, pp. 79- 94 ,(1998) , 10.1016/S0966-9795(97)00043-5
Kamal Mahdouk, Jean-Claude Gachon, A thermodynamic study of the Al–Cr–Nb ternary system Journal of Alloys and Compounds. ,vol. 321, pp. 232- 236 ,(2001) , 10.1016/S0925-8388(01)00961-6
Xiaodong Tian, Xiping Guo, Structure of Al-modified silicide coatings on an Nb-based ultrahigh temperature alloy prepared by pack cementation techniques Surface & Coatings Technology. ,vol. 203, pp. 1161- 1166 ,(2009) , 10.1016/J.SURFCOAT.2008.10.018
B. P. Bewlay, M. R. Jackson, P. R. Subramanian, J. -C. Zhao, A review of very-high-temperature Nb-silicide-based composites Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science. ,vol. 34, pp. 2043- 2052 ,(2003) , 10.1007/S11661-003-0269-8
Z.D. Xiang, P.K. Datta, Conditions for pack codeposition of Al and Hf on nickel-base superalloys Surface & Coatings Technology. ,vol. 179, pp. 95- 102 ,(2004) , 10.1016/S0257-8972(03)00790-4
Z.D. Xiang, S.R. Rose, P.K. Datta, Codeposition of Al and Si to form oxidation-resistant coatings on γ-TiAl by the pack cementation process Materials Chemistry and Physics. ,vol. 80, pp. 482- 489 ,(2003) , 10.1016/S0254-0584(02)00551-5
T. C. Munro, B. Gleeson, The deposition of aluminide and silicide coatings on γ-TiAl using the halide-activated pack cementation method Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science. ,vol. 27, pp. 3761- 3772 ,(1996) , 10.1007/BF02595625
Honghui Xu, Yong Du, Hailin Chen, Yuehui He, Zhu Pan, J.C. Schuster, Richu Wang, Isothermal section at 1000°C of the Nb–Ti–Si system Journal of Alloys and Compounds. ,vol. 394, pp. 235- 239 ,(2005) , 10.1016/J.JALLCOM.2004.11.016