STUDY OF OXIDATION OF NDFEB PERMANENT-MAGNETS

被引：13

作者：

HUA, HC ^{[1
]}

WANG, GY ^{[1
]}

XU, QZ ^{[1
]}

JIN, HJ ^{[1
]}

XU, GQ ^{[1
]}

机构：

[1] SHANGHAI IRON & STEEL RES INST,SHANGHAI 200940,PEOPLES R CHINA

来源：

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH | 1991年 / 125卷 / 02期

关键词：

D O I：

10.1002/pssa.2211250223

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The oxidation of sintered NdFeB magnets in a 90-degrees-C humid atmosphere is studied by TEM, AES, X-ray, and MoBbauer spectroscopy. In the surface layer the black oxidized structure enriched with Nd and oxygen and with low Fe content is formed by selective corrosion of the Nd-rich boundary phase and then this structure expanded into the Nd2Fe14B matrix phase. The brown rust powder formed by 500 h oxidation consists of residual Nd2Fe14B particles and oxides (Fe3O4, Nd2O3, alpha-Fe2O3, and cubic Fe2O3). The distribution of Fe atoms at six crystalline sites in the oxidized Nd2Fe14B lattice changes, especially the Fe atoms on the c-site are reduced. The decrease in magnetization of oxidized NdFeB magnets is reported.

引用

页码：615 / 624

页数：10

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