Improvements in properties of NdFeB magnets obtained via magnetron sputtering and thermal diffusion  

作　　者：Jin Tang Weichao Huang Dan Li 

机构地区：[1]School of Electronic Engineering,Guangxi University of Science and Technology,Liuzhou,545006,China [2]China Rare Earth(Guangxi)Jinyuan Rare Earth New Materials Co.,Ltd.,Hezhou,542603,China [3]China Rare Earth Group Co.,Ltd.,Ganzhou,341000,China [4]Center of Experimental Teaching for Common Courses,Panzhihua University,Panzhihua,617000,China

出　　处：《Journal of Rare Earths》2024年第9期1710-1716,I0003,共8页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Program "Rare Earth New materials" Key Project (2022YFB3505400);the Guangxi Science and Technology Base and Talent Special Project (GuikeAD19245013)。

摘　　要：The grain boundary diffusion process(GBDP) of Dy and DyAl on sintered NdFeB magnets was conducted via magnetron-sputtering deposition of Dy and DyAl films to enhance coercivity(H_(cj)),The magnetic properties,microstructure and anti-corrosion properties of Dy-surface-alloying NdFeB magnets obtained via magnetron sputtering and thermal diffusion were evaluated.The H_(cj) of the Dy_(95)Al_(5)-NdFeB magnet increases by 32.68%,while the remanence declines slightly.Furthermore,X-ray diffraction and microstructural analysis confirm the formation of Dy-rich shells,the higher-magnetic-anisotropy field of hard(Nd_(x)Dy_(1-x))2(FeAl)_(14)B magnetic phases and an optimised grain boundary structu re,contributing to the H_(cj)enhancement of the magnet.The elemental distribution and diffusion mechanism of the magnets are also discussed.Moreover,the corrosion resistance of the Dy_(95)Al_(5)-NdFeB magnet is substantially improved by enhancing the electrochemical stability and optimising the distribution and morphology of the intergranular phases.The findings of this study are of substantial importance in the development of low-heavy rare-earth sintered NdFeB magnets.

关 键 词：Magnetron sputtering NDFEB Rare earths MICROSTRUCTURE Magnetic property Corrosion resistance 

分 类 号：TM27[一般工业技术—材料科学与工程]