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铌基合金表面Al-B包埋共渗层的组织及抗氧化性能 被引量:5

Microstructure and Oxidation Resistance of Al-B Co-Deposition Coatings on Nb-Based Alloy Prepared by Pack Cementation Process
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摘要 为提高铌基合金的抗氧化性能,采用包埋共渗法在铌基合金表面于780,860,940℃保温4 h包埋共渗Al-B涂层,采用扫描电镜、X射线衍射仪分析共渗层形貌及结构,采用能谱仪分析其成分;采用高温氧化试验研究渗层的抗高温氧化性能。结果表明:渗层主要形成了Nb Al3,Nb B2和Nb5B6三相,其中在940℃形成的渗层中形成了Al B12相,Al B12在高温下对渗层起到了一定的修复作用;经1 000℃氧化20 h后,渗层保持原始的相组成,并在表面形成由Al Nb O4,Nb O2,B2O3和Al2O3组成的致密混合氧化膜,且与基体结合良好;Al-B共渗层一定程度上改善了铌基合金的抗氧化性能。 In order to improve the oxidation resistance of the Nb-based alloy,Al-B co-deposition coatings were prepared on the alloys at 780,860,940 ℃ for 4 h by pack cementation process. The structure and composition of the coatings were analyzed by scanning electron microscopy( SEM)equipped with energy dispersive spectroscopy( EDS) and X-ray diffractometry( XRD),and the high-temperature oxidation resistance of the coatings was studied by high-temperature oxidation tests. Results showed that the coating was mainly composed of NbA l3,NbB2 and Nb5B6 phases,and AlB 12 phase only formed in the coating at 940 ℃ which could repair the coating at high temperature in a certain degree. After oxidation at 1 000 ℃ for 20 h,the Al-B coatings retained the original constituent phases and adense mixed oxide film composed of AlN bO 4,NbO2,B2O3 and Al2O3was formed and adhered to the substrate well. The Al-B co-deposition coating could improve the oxidation resistance of Nb-based alloys at a certain degree.
出处 《材料保护》 CAS CSCD 北大核心 2015年第7期15-19,共5页 Materials Protection
基金 国家自然科学基金(51371059 51001032) 广西自然科学基金(2014GXNSF-CA118013 0731013) 广西高等学校高水平创新团队项目(第二批) 广西自然科学基金创新研究团队项目(2011GXNSFF018001)资助
关键词 铌基合金 Al-B共渗涂层 组织结构 抗氧化性能 Nb-based alloy Al-B co-deposition coatings structure oxidation resistance
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