Research On The Preparation And Properties Of Fe Based Amorphous Nanocrystalline Alloy Core

As a new soft magnetic material,Fe-based amorphous nanocrystalline alloys have excellent soft magnetic properties,such as low coercivity.low core loss and high permeability.At the same time,their preparation process is relatively simple,and they have broad application prospects in power electronics,new energy and other fields.In this paper,Fe73.5Si13.5B9Cu3Nb1 amorphous nanocrystalline alloy,which is widely used at present,is studied.Firstly,the amorphous ribbon is prepared by single roll method and coiled into a magnetic core.Then,the structure and thermal stability of the ribbon are analyzed.Then,the heat treatment process curve of the magnetic core is worked out according to the thermal stability parameters.Finally,the influence of heat treatment process on the comprehensive properties of magnetic cores is discussed,and the optimum heat treatment process is determined.At the same time,the relationship between the properties of magnetic cores and the domain structure is further observed.The results show that the optimum heat treatment process is 564? and 60 min.At IKHz.the inductance coefficient AL is 38.30?H/N2,the effective permeability ?e is 47.57 K,and the coercive force He is 2.93 A/m.In order to further optimize the performance of magnetic cores and improve the qualified rate,more effective transverse magnetic field heat treatment was adopted with magnetic field of 4000G.The results show that the performance of the core with magnetic field is better than that without magnetic field.When the magnetizing time is 3h,the inductance coefficient AL of the core is 61.07?H/N2 at 1KHz.the effective permeability Mu e is 72.81k,and the coercivity He is 1.98A/m.The analysis of domain structure shows that after heat treatment,the magnetic core changes from bending domain to straight domain,and the distribution of domain structure is uniform.At 564? and 60 min.the domain structure is a wide 180°straight domain,and the corresponding core performance is also optimal.When a magnetic field perpendicular to the tape is added,the domain structure becomes simpler,the bright domain gradually transits to the dark domain,and the comprehensive performance of the corresponding core is further improved.According to the heat treatment process and the performance parameters of the core,a magnetic core with excellent performance has been developed.At the same time,the core can reduce the cost of the tape by reducing the size of the core properly under the premise of meeting the performance requirements of the factory.