Nb-Ti-Si基超高温合金表面Si-Al-Y共渗层的组织形成

doi:10.3724/SP.J.1077.2010.01209

无机材料学报 ›› 2010, Vol. 25 ›› Issue (11): 1209-1216.DOI: 10.3724/SP.J.1077.2010.01209 CSTR: 32189.14.SP.J.1077.2010.01209

Nb-Ti-Si基超高温合金表面Si-Al-Y共渗层的组织形成

张超峰, 郭喜平

(西北工业大学凝固技术国家重点实验室, 西安 710072)

收稿日期:2010-03-10 修回日期:2010-05-22 出版日期:2010-11-20 网络出版日期:2010-11-01
基金资助:
国家自然科学基金(50871087); 凝固技术国家重点实验室自主研究课题(07-TP-2008)

Microstructure of Si-Al-Y Co-deposition Coatings on an Nb-Ti-Si Based Ultrahigh Temperature Alloy

ZHANG Chao-Feng, GUO Xi-Ping

(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China)

Received:2010-03-10 Revised:2010-05-22 Published:2010-11-20 Online:2010-11-01
Supported by:
National Natural Science Foundation of China (50871087); Research Fund of the State Key Laboratory of Solidification Processing (07-TP-2008)

摘要/Abstract

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-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, 但中间层却由(Nb,X)Al₃和(Nb,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10μm, 主要由Al₂O₃、TiO₂和SiO₂组成.

关键词: Nb-Ti-Si基合金, 包埋共渗, Si-Al-Y共渗层, 氧化膜

Abstract: The oxidation-resistant Si-Al-Y co-deposition coatings on a Nb-Ti-Si based ultrahigh temperature alloy were prepared by halide activated pack cementation processes. SEM, EDS and XRD analyses were used to study the influences of the holding temperature and the content of Al in pack mixtures on the microstructural formation of the coatings. The results show that the coatings prepared with the pack mixture of 10Si-10Al-3Y-5NaF-72Al₂O₃ (wt%) at different temperatures (1050℃, 1080℃ and 1150℃, respectively) have a similar structure, consisting of a (Nb,X)Si₂(X represents Ti, Cr and Hf elements) outer layer, a (Nb, X)5Si3 mid layer, a sub-inner layer composed of (Cr,Al)₂(Nb,X) and (Nb,X)Al₃ phases, and a very thin inner layer consisting of (Nb,X)2Al phase. The microstructure of the coatings prepared at 1050℃ for 10h changes evidently with the content of Al in the pack mixtures (10Si-xAl-3Y-5NaF-(82-x)Al₂O₃ (wt%) (x=10, 15, 20, respectively)). Increasing the content of Al in the pack mixture to 15wt%, the constituent phases of the mid layer of the coating change into (Nb,X)Al₃ and (Nb,X)₅Si₃, but the constituent phases remain unchanged in the outer layer, sub-inner layer and inner layer in the coating. The main constituent phases of the outer layer of the coating prepared with the pack mixture containing 20wt% Al are (Nb,X)Si₂ and (Nb,X)₃Si₅Al₂, while the constituents phases of the other layers in this coating are the same as those in the coating prepared with the pack mixture containing 15wt% Al. The scale developed on Si-Al-Y co-deposition coating which was prepared with 10Si-15Al-3Y-5NaF-67Al₂O₃ (wt%) pack mixture at 1050℃ for 10h, upon oxidation at 1250℃ for 0.5h, is about 10μm thick, and composed of Al₂O₃, TiO₂ and SiO₂.

Key words: Nb-Ti-Si based alloy, pack cementation, Si-Al-Y co-deposition coating, scale formation

中图分类号:

TB174

张超峰, 郭喜平. Nb-Ti-Si基超高温合金表面Si-Al-Y共渗层的组织形成[J]. 无机材料学报, 2010, 25(11): 1209-1216.

ZHANG Chao-Feng, GUO Xi-Ping. Microstructure of Si-Al-Y Co-deposition Coatings on an Nb-Ti-Si Based Ultrahigh Temperature Alloy[J]. Journal of Inorganic Materials, 2010, 25(11): 1209-1216.

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Nb-Ti-Si基超高温合金表面Si-Al-Y共渗层的组织形成

Microstructure of Si-Al-Y Co-deposition Coatings on an Nb-Ti-Si Based Ultrahigh Temperature Alloy

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