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

作　　者：Xiaoqiang Li Jian Li Kai Xu Zhiwei Wang Yu Bian Yuxuan Shao Chengchao Hu Junjie Ni 

机构地区：[1]School of Materials Science and Engineering,Liaocheng University,Liaocheng 252000,China [2]Frontier Institute of Science and Technology,Xi’an Jiaotong University,Xi'an 710049,China [3]Liaocheng Key Laboratory of Magnetic Materials,Liaocheng 252500,China

出　　处：《Journal of Rare Earths》2022年第6期930-936,I0003,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(52174346);Natural Science Foundation of Shandong Province of China(ZR2021ME031)。

摘　　要：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 technologies.Additions 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 phases.Nano-TiC dopants especially with a size of40 nm can increase the electrochemical corrosion resistance of magnets.It is attributed to the hindrance of additives on the reaction channel formation and their barrier effect on the oxidations of Nd and Fe.For 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 

分 类 号：TB34[一般工业技术—材料科学与工程]