Fabrication and Properties of Micro-arc Oxidation Coatings on Sintered NdFeB Permanent Magnets

被引：4
作者：
Xu Jilin [1 ,2 ]
Xiao Qifei [2 ]
Mei Dingding [2 ]
Zhong Zhenchen [3 ]
Tong Yunxiang [1 ]
Zheng Yufeng [1 ]
Li Li [1 ]
机构：
[1] Harbin Engn Univ, Ctr Biomed Mat & Engn, Harbin 150001, Heilongjiang, Peoples R China
[2] Nanchang Hangkong Univ, Nanchang 330063, Jiangxi, Peoples R China
[3] Jiangxi Univ Sci & Technol, Inst Rare Earth Magnet Mat & Devices, Ganzhou 341000, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2018年 / 47卷 / 04期
基金：
中国博士后科学基金;
关键词：
sintered NdFeB; permanent magnet; micro-arc oxidation; corrosion resistance; magnetic property; CORROSION-RESISTANCE; COMPOSITE COATINGS; BEHAVIOR; ALLOY;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 similar to 5 Rm, 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.
引用
收藏
页码：1059 / 1063
页数：5
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