Research Progress of Cerium in ThMn12 Type Low Rare Earth Permanent Magnet Alloy
Compared with the expensive rare earth elements such as Nd and Sm,Ce shows greater potential to be applied to the preparation of rare earth permanent magnet alloys.Because of its extremely rich reserves and low price,it is called"free rare earth".ThMn12 low rare earth permanent magnet alloy has high Curie tempera-ture,large saturation magnetization and magnetocrystalline anisotropy field,which meets the requirements of high-performance permanent magnets in the fields of wind power generation,electric vehicles and so on.From the perspective of cost reduction and retention performance,the research progress of rare earth Ce partially doped RFe12 compounds(R is mainly Nd,Sm,Zr),including doping content and magnetic properties,is re-viewed.Secondly,the simulation calculation of pure Ce based Ce(Fe,M)12 compounds in recent years is summa-rized and discussed,including common calculation methods and the calculation of monobasic Ce γ→α phase transition,valence state of Ce,interstitial atom effect in Ce(Fe,M)12 compounds,etc.Finally,the problems and prospects of developing new high-performance permanent magnets are summarized and prospected.
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