Preparation Of Fe-based Amorphous Nanocrystalline Powder And Its Application

Firstly,systematically researched of the preparation technology for Fe_73.5Cu₁Nb₃Si_13.5B₉ amorphous and nanocrystalline power,which prepared by grinding ribbons;Then,the magnetic powder core of amorphous and nanocrystalline Fe_73.5Cu₁Nb₃Si_13.5B₉ was prepared by compression molding and study on preparation technology and soft magnetic properties;Finally,prepared the sound absorption material that contained Fe_73.5Cu₁Nb₃Si_13.5B₉ amorphous power and discussed powder effect on sound absorption performance.The results showed that the amorphous ribbon must be embrittled and obtained the powder over 100 mesh.The optimum embrittlement parameters that is the annealing temperature is 250℃×1h;It is acquiried the powder whose size less than 10μm by the way of grinding the amorphous ribbon by grinder firstly then milling by planetary ball mill.The morphology of obtained powder were polygon.The milling had no effect on the crystallization;The grain size of nanocrystalline powders was less than 25nm by the crystallization treatment of amorphous powder and the the optimum crystallization parameters was 550℃×0.5h.The molding rate of magnetic powder core reached maximum when the pressure was 200KN and the content of organic plasticizer was 6.50%by the wet-pressure molding technology using the powder;The permeability(μ) of nanocrystalline magnetic powder core more than the permeability of non-crystal magnetic powder cores;The permeability increased and quality factor(Q) decreased with the increasing of particle size and the permeability had execelent frequency stability in the frequency of 100K～1MHz;With the increasing of forming pressure,which change in the range of 85-300KN,theμincreased gradually and becomes flat and the Q present the trend of first increased and then decreased;In the range of 20℃～80℃, the permeability decreased continuously as increasing of testing temperature and Q increased gradually and reached maximum at 700KHz.the magnetic powder core was annealed noce again and the result showed that,Q andμpresent the trend of first increased and then decreased with the increasing of annealing temperature andμ_m was up to 5.321×10⁵;When the mass ratio is 9:1 of 60～100mesh and over 400 nesh, the permeability reached to maximum and the value is 62.The amorphous powder of Fe_73.5Cu₁Nb₃Si_13.5B₉ was added to butyl rubber(IIR) and can improve the sound absorption property at ow frequency.When the slice of composites was 1mm and the mass ratio of amorphous powder and IIR was 100%, the powder of 60～100mesh as the filler had the optimum sound absorption effect.The bandwidth of sound absorption of low frequency was broaden and the range was 500Hz～2000Hz and the peak value of the sound absorption coefficient reached 0.34.