Al对Nb-Ti-Si基合金表面Si-Al-Y<sub>2</sub>O<sub>3</sub>共渗层的影响

doi:10.3724/SP.J.1037.2010.00044

金属学报

2010, Vol. 46

Issue (7): 821-831 DOI: 10.3724/SP.J.1037.2010.00044

论文

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Al对Nb-Ti-Si基合金表面Si-Al-Y₂O₃共渗层的影响

张平, 郭喜平

西北工业大学凝固技术国家重点实验室, 西安 710072

EFFECTS OF Al ON Si-Al-Y₂O₃ CO-DEPOSITION COATINGS ON Nb-Ti-Si BASE ULTRAHIGH TEMPERATURE ALLOY

ZHANG Ping, GUO Xiping

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072

引用本文:

张平郭喜平. Al对Nb-Ti-Si基合金表面Si-Al-Y₂O₃共渗层的影响[J]. 金属学报, 2010, 46(7): 821-831.
, . EFFECTS OF Al ON Si-Al-Y₂O₃ CO-DEPOSITION COATINGS ON Nb-Ti-Si BASE ULTRAHIGH TEMPERATURE ALLOY[J]. Acta Metall Sin, 2010, 46(7): 821-831.

全文: PDF(1680 KB)

摘要:

采用Si-Al-Y₂O₃包埋共渗工艺在Nb-Ti-Si基超高温合金表面制备Y改性的Si-Al共渗层, 分析了渗剂中Al粉含量对渗层组织和相组成的影响, 并研究了其在1250℃的抗氧化性能. 结果表明: 采用不同Al粉含量的渗剂在1050℃所制备的Si-Al-Y₂O₃共渗层均具有多层复合结构, 且渗层的内层都是由Al₃(Nb, X)(X代表Ti, Cr和Hf)和 (Cr, Al)₂(Nb, Ti)相组成; 当渗剂中Al粉含量为10%(质量分数)时, 渗层的外层以(Nb, X)Si₂相为主, 中间层以(Nb, X)₅Si₃相为主; 当渗剂中Al粉含量为15%时, 渗层中间层由 (Nb, X)₅Si₃及Al₃(Nb, X)两相组成, 而外层组成相相对于渗剂中Al粉含量为10%时的未发生变化; 当渗剂中Al粉含量为20\%时, 渗层的外层以 (Nb, X)₃Si₅Al₂相为主, (Nb, X)Si₂相弥散分布其中, 中间层则以Al₃(Nb, X)为基体相, (Nb, X)₅Si₃相弥散分布其中, 并在其上部分布较少而下部较密集. Y在渗层中的分布不均匀, 并且随着渗剂中Al粉含量的提高, 渗层各层中的Y含量均增加. Si-Al-Y₂O₃共渗层的形成是一个在合金表面先沉积Al、后沉积Si的有序过程, 其生长服从抛物线规律. 在1250℃下氧化5 h后, 渗层表面生成了致密的Al₂O₃膜.

关键词 ： Nb-Ti-Si基超高温合金, Si-Al-Y₂O₃共渗层, 有序沉积, 复合结构, 抗氧化性能

Abstract：

Si-Al-Y₂O₃ co-deposition coatings on an Nb-Ti-Si base ultrahigh temperature alloy were prepared by pack cementation processes at 1050℃. The effects of Al content (mass fraction) in pack mixtures on the microstructure and constituent phases of the co-deposition coatings were studied, and the oxidation-resistant performance of the coating was investigated. The results show that all coatings prepared at 1050℃with pack mixtures containing different Al contents have a multiple layer structure, and the inner layers of all coatings are composed of Al₃(Nb, X) (X represents Ti, Cr and Hf) and (Cr, Al)₂(Nb, Ti) phases. The outer layer of the coating prepared at 1050℃ for 10 h with the pack mixture containing 10% Al is composed of (Nb, X)Si₂, and the middle layer is composed of (Nb, X)₅Si₃. However, the constituent phases change into Al₃(Nb, X) and (Nb, X)₅Si₃ in the middle layer of the coating prepared with the pack mixture containing 15%Al. (Nb, X)₃Si₅Al₂ and (Nb, X)Si₂ phases have been detected in the outer layer of the coating prepared with the pack mixture containing 20%Al, and Al₃(Nb, X) is the main phase constituent in its middle layer with dispersed (Nb, X)₅Si₃ particles in it. EDS analysis reveals that the distribution of Y in the coatings is not uniform, with its content increasing with the rising of Al content in the pack mixtures. Co-deposition of Al and Si occurs in a sequential manner during the deposition process and the growth of the coatings obeys a parabolic kinetics. After oxidation at 1250℃ for 5 h, dense Al₂O₃ scales have formed on the coatings, which prevent the oxygen from diffusion into the substrate effectively.

Key words： Nb-Ti-Si base ultrahigh temperature alloy Si-Al-Y₂O₃ co-deposition coating sequential deposition multiple layer structure oxidation-resistant performance

收稿日期: 2010-01-24

基金资助:

国家自然科学基金项目50871087和凝固技术国家重点实验室自主研究课题项目07-TP-2008资助

作者简介: 张平, 男, 1984年生, 博士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00044 或 https://www.ams.org.cn/CN/Y2010/V46/I7/821

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