2O3結晶相,并含有少量的Fe、Nd和P元素。微弧氧化處理后,燒結NdFeB的表面粗糙度有所增加,耐蝕性較基體提高了1個數量級。然后,微弧氧化處理后,燒結NdFeB磁體的剩磁和最大磁能積較未處理NdFeB有所下降。"/>

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燒結NdFeB永磁體表面微弧氧化涂層的制備及性能
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南昌航空大學,南昌航空大學,南昌航空大學,江西理工大學,哈爾濱工程大學生物醫(yī)學材料與工程研究中心,哈爾濱工程大學生物醫(yī)學材料與工程研究中心,哈爾濱工程大學生物醫(yī)學材料與工程研究中心

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中國博士后科學基金


Fabrication and properties of micro-arc oxidation coatings on sintered NdFeB permanent magnets
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Nanchang Hangkong University,School of Materials Science and Engineering,Nanchang Hangkong University,School of Materials Science and Engineering,Nanchang Hangkong University,The Institute for Rare Earth Magnetic Materials and Devices,Jiangxi University of Science and Technology,Center for Biomedical Materials and Engineering,Harbin Engineering University,Center for Biomedical Materials and Engineering,Harbin Engineering University,Center for Biomedical Materials and Engineering,Harbin Engineering University

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    摘要:

    為了提高燒結NdFeB永磁體的耐蝕性,本文在鋁酸鹽溶液中采用二步微弧氧化工藝在燒結NdFeB永磁體表面制備了氧化鋁陶瓷涂層。微弧氧化過程中,電壓-時間曲線可大致分為四個階段,與閥金屬處理的曲線基本一致。燒結NdFeB表面制備的涂層呈現出典型的微弧氧化多孔形貌,厚度大約為5 μm。涂層中僅含有Al2O3結晶相,并含有少量的Fe、Nd和P元素。微弧氧化處理后,燒結NdFeB的表面粗糙度有所增加,耐蝕性較基體提高了1個數量級。然后,微弧氧化處理后,燒結NdFeB磁體的剩磁和最大磁能積較未處理NdFeB有所下降。

    Abstract:

    In order to improve the corrosion resistance of the sintered NdFeB permanent magnets, Al2O3 ceramic coatings were prepared by a two-step micro-arc oxidation process in an aluminate solution. During the micro-arc oxidation process, the voltage-time curve could be divided into four regions consistent with the valve metals. The coating exhibited a typical micro-arc oxidation porous surface with the thickness of ~5 μm, and was only composed of Al2O3 crystalline phase with some Fe elements and a few Nd and P elements. The surface roughness of coated NdFeB magnets was higher than that of uncoated sample, while the corrosion resistance was enhanced by one order of magnitude. Unfortunately, the magnetic properties (remanence and maximum energy product) of coated NdFeB sample decreased in different degrees.

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徐吉林,肖奇飛,梅丁丁,鐘震晨,佟運祥,鄭玉峰,李莉.燒結NdFeB永磁體表面微弧氧化涂層的制備及性能[J].稀有金屬材料與工程,2018,47(4):1059~1063.[Jilin Xu, Qifei Xiao, Dingding Mei, Zhenchen Zhong, Yunxiang Tong, Yufeng Zheng, Li Li. Fabrication and properties of micro-arc oxidation coatings on sintered NdFeB permanent magnets[J]. Rare Metal Materials and Engineering,2018,47(4):1059~1063.]
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  • 收稿日期:2016-09-06
  • 最后修改日期:2018-04-18
  • 錄用日期:2016-11-11
  • 在線發(fā)布日期: 2018-05-31
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