摘要
Nanostructured anisotropic Nd-Fe-B/Fe(C) composite powders were prepared by coating Fe(C) softmagnetic nanoparticles on HDDR Nd-Fe-B hard magnetic powders using iron pentacarbonyl Fe(CO)5 as soft-phase precursor.The effect of Fe(CO)5-loading amount on soft-phase purity,coating morphology and magnetic properties of the composite powders was investigated.Dense and continuous Fe(C) softphase coatings with average particle sizes of 58-68 nm are obtained at Fe(CO)5 loading amounts of x <12 wt%,leading to enhanced remanence and improved energy product of the coated powders.Positive value in δM-plots and single-phase-like demagnetization curves are observed in the Nd-Fe-B/Fe(C) composite powders,indicating the exchange coupling effect between the coated Fe(C) soft phases and the Nd-Fe-B hard phase.
Nanostructured anisotropic Nd-Fe-B/Fe（C） composite powders were prepared by coating Fe（C） softmagnetic nanoparticles on HDDR Nd-Fe-B hard magnetic powders using iron pentacarbonyl Fe（CO）5 as soft-phase precursor.The effect of Fe（CO）5-loading amount on soft-phase purity,coating morphology and magnetic properties of the composite powders was investigated.Dense and continuous Fe（C） softphase coatings with average particle sizes of 58-68 nm are obtained at Fe（CO）5 loading amounts of x <12 wt%,leading to enhanced remanence and improved energy product of the coated powders.Positive value in δM-plots and single-phase-like demagnetization curves are observed in the Nd-Fe-B/Fe（C） composite powders,indicating the exchange coupling effect between the coated Fe（C） soft phases and the Nd-Fe-B hard phase.
基金
Project supported by the National Natural Science Foundation of China(51771219,51771220,and 51422106)
the State Key Laboratory of Rare Earth Permanent Magnetic Materials Opening Foundation(SKLREPM170F03)
the China Postdoctoral Science Foundation(2016M601989)
the Natural Science Foundation of Ningbo City(2016A610249 and 2017A610030)
