摘要
为了提高烧结NdFeB永磁体的耐蚀性,在铝酸盐溶液中采用二步微弧氧化工艺在烧结NdFeB永磁体表面制备了氧化铝陶瓷涂层。微弧氧化过程中,电压-时间曲线可大致分为4个阶段,与阀金属处理的曲线基本一致。烧结NdFeB表面制备的涂层呈现出典型的微弧氧化多孔形貌,厚度大约为5μm。涂层中仅含有Al_2_O3结晶相,并含有少量的Fe、Nd和P元素。微弧氧化处理后,烧结NdFeB的表面粗糙度有所增加,耐蚀性较基体提高了1个数量级。然而,微弧氧化处理后烧结NdFeB磁体的剩磁和最大磁能积较未处理NdFeB有所下降。
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. Results show that the coating exhibits a typical micro-arc oxidation porous surface with the thickness of-5 μm, and is only composed of Al2O3 crystalline phase with some Fe elements and a few Nd and P elements. The surface roughness of coated NdFeB magnets is higher than that of uncoated sample, while the corrosion resistance is enhanced by one order of magnitude. Unfortunately, the magnetic properties（remanence and maximum energy product） of coated NdFeB sample decrease in different degrees.
作者
徐吉林
肖奇飞
梅丁丁
钟震晨
佟运祥
郑玉峰
李莉
Xu Jilin;Xiao Qifei;Mei Dingding;Zhong Zhenchen;Tong Yunxiang;Zheng Yufeng;Li Li(Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China;Nanchang Hangkong University, Nanchang 330063, China;The Institute for Rare Earth Magnetic Materials and Devices, Jiangxi University of Science and Technology Ganzhou 341000, China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第4期1059-1063,共5页
Rare Metal Materials and Engineering
基金
China Postdoctoral Science Foundation(2013M541343)
the Fundamental Research Funds for the Central Universities(HEUCF20151002)
关键词
烧结NDFEB
永磁体
微弧氧化
耐蚀性
磁性能
sintered NdFeB
permanent magnet
micro-arc oxidation
corrosion resistance
magnetic property
