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Microstructure and corrosion resistance of sintered NdFeB magnet modified by intergranular additions of MgO and ZnO

Journal of Rare Earths 2008年第2期26卷 268-273页

作者：莫文剑张澜庭刘琼珍单爱党吴建生 Komuro Matahiro 沈丽萍 School of Materials Science and Engineering Shanghai Jiao Tong University Advanced Research Laboratory Hitachi Ltd. Hitachi-shi Ibaraki-ken 319-1292 Japan Hitachi (China) Research & Development Corporation Shanghai Branch

Microstructure and corrosion resistance of sintered Nd15Dy1.2Fe77Al0.8B6 and Nd22Fe71B7 magnets modified by intergranular addition of MgO and ZnO were investigated. Both the remanence and sintering density of the magnets increased slightly with intergranular additions of MgO and ZnO. There was a remarkable increase in coercivity of Nd22Fe71B7 after addition. Besides, the effects on magnetic properties and an improved corrosion resistance were observed. Compared with the native magnets without addition, corrosion potential of the magnets with MgO and ZnO additives was more positive and the current density in the anodic branch of the polarization curve was reduced. Corrosion resistance resulting from autoclave testing （2×10^5 Pa of steam pressure, 120 ℃） showed that the corrosion rate of NdFeB magnets reduced with the increase of additive amount. Microstructure observation revealed that MgO and ZnO additives were incorporated into the intergranular phases in the magnets. With the introduction of MgO and ZnO, more intergranular phase with high oxygen content was formed while keeping the volume fraction of all the intergranular phases almost unchanged, which may contribute to improved corrosion resistance. Furthermore, addition of MgO and ZnO refined the grain size of Nd22Fe71B7.

关键词： NdFeB magnets intergranular addition magnetic properties corrosion resistance microstructure rare earths

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Effect of nano-TiC dopant size on magnetic properties and corrosion resistance of hot-deformed NdFeB

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Journal of Rare Earths 2022年第6期40卷 930-936,I0003页

作者： Xiaoqiang Li Jian Li Kai Xu Zhiwei Wang Yu Bian Yuxuan Shao Chengchao Hu Junjie Ni School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi'an 710049China Liaocheng Key Laboratory of Magnetic Materials Liaocheng 252500China

Effects of dopant size on the magnetic properties and corrosion behavior of hot-deformed NdFeB with the intergranular additions of nano-TiC were investigated using X-ray diffraction(XRD),X-ray photoelectron spectrometer(XPS),scanning electron microscopy(SEM),electrochemical and magnetic measurement *** of 50 nm-TiC,unlike 30 nm- and 40 nm-TiC,are found to increase the magnetic energy product and comprehensive magnetic properties,due in main to the improvement of magnet orientation by more strip-shaped Nd-rich ***-TiC dopants especially with a size of40 nm can increase the electrochemical corrosion resistance of *** is attributed to the hindrance of additives on the reaction channel formation and their barrier effect on the oxidations of Nd and *** 40 nm-TiC doped magnet,the charge transfer resistance in electric double layer structure reaches 15000 Ω·cm^(2) that is one order of magnitude higher than other cases,which is responsible for the lowe st corrosion current density and accordingly the best anti-corrosion properties.

关键词： NdFeB Nano-TiC intergranular addition Magnetic properties Electrochemical corrosion Rare earths

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