Nb/NbCr<sub>2</sub>合金表面硅化物涂层的高温抗氧化性能<sup>*</sup>

doi:10.11901/1005.3093.2014.548

材料研究学报

2015, Vol. 29

Issue (6): 410-416 DOI: 10.11901/1005.3093.2014.548

本期目录 | 过刊浏览

Nb/NbCr₂合金表面硅化物涂层的高温抗氧化性能^*

乔彦强,李懋源,郭喜平(

)

西北工业大学凝固技术国家重点实验室西安 710072

High Temperature Oxidation Resistance of Silicide Coatings on Nb/NbCr₂ Alloy

Yanqiang QIAO,Maoyuan LI,Xiping GUO(

)

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

引用本文:

乔彦强,李懋源,郭喜平. Nb/NbCr₂合金表面硅化物涂层的高温抗氧化性能^*[J]. 材料研究学报, 2015, 29(6): 410-416.
Yanqiang QIAO, Maoyuan LI, Xiping GUO. High Temperature Oxidation Resistance of Silicide Coatings on Nb/NbCr₂ Alloy[J]. Chinese Journal of Materials Research, 2015, 29(6): 410-416.

全文: PDF(5944 KB) HTML

摘要:

用扩散渗法在Nb/NbCr₂合金表面制备硅化物涂层, 研究了基体合金和涂层在1250℃的氧化行为。结果表明：在Nb/NbCr₂合金表面渗Si所得硅化物涂层由(Nb, Cr)Si₂和(Cr, Nb)Si₂两相组成, 过渡层为(Nb, Cr)₅Si₃, 涂层的生长动力学服从抛物线规律。基体合金在1250℃氧化形成的氧化膜为Nb₂O₅和CrNbO₄交替分布的疏松组织, 与基体有剥离现象。渗Si涂层在1250℃氧化形成的氧化膜较为致密完整, 与残留涂层结合良好, 为SiO₂和CrNbO₄混合氧化膜, 改善了合金的高温抗氧化性能。

关键词 ：材料失效与保护, Laves相NbCr₂, 扩散渗, 硅化物涂层, 抗氧化性能

Abstract：

Silicide coatings on Nb/NbCr₂ alloy were prepared by pack cementation method. The oxidation behavior of the bare- and coated-alloy was examined by isothermal test at 1250 ℃ in static air. The results show that the silicide coatings are composed of (Nb, Cr)Si₂ and (Cr, Nb)Si₂ phases. There exist a transitional layer of (Nb, Cr)₅Si₃ in between the main coating and substrate. The coating growth kinetics at 1250℃ fits to parabolic law. The oxidation of Nb/NbCr₂ alloy resulted in alternate layers of Nb₂O₅ and CrNbO₄ with porous structure, which was wrinkling even spalling off after oxidation. The scale formed on the silicide coating after oxidation at 1250℃ was mainly composed of SiO₂ and CrNbO₄. The scale was relatively dense and had a good bond with the residual coating, thus showing an excellent oxidation resistance.

Key words： materials failure and protection Laves phase NbCr₂ pack cementation process silicide coating oxidation resistance

收稿日期: 2014-09-28

基金资助:^* 国家自然科学基金51401166和51371145,陕西省自然科学基金2014JQ6215和凝固技术国家重点实验室西北工业大学自主研究课题116-QP-2014资助项目。

作者简介: 郭喜平, 教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.548 或 https://www.cjmr.org/CN/Y2015/V29/I6/410

图1 Nb/NbCr2合金铸态组织的BSE像

图2 经1250℃制备渗Si涂层的XRD谱

图3 经1250 ℃保温不同时间所制备渗Si涂层横截面的BSE像

图4 在1250 ℃保温8 h渗Si涂层的高倍BSE像

图5 在1250℃保温涂层厚度与保温时间(t)的关系

图6 基体合金和渗Si试样 (8 h) 在1250 ℃氧化10 h后氧化膜表面的XRD谱

图7 基体合金在1250℃氧化10 h后横截面的BSE像

图8 渗Si涂层 (8 h) 在1250℃氧化10 h后横截面的BSE像

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