The influence of micro-structure on magnetic properties of amorphous powder core was investigated.The results show that the amorphous powders of the powder core become crystallized with the increase of annealing tempe...The influence of micro-structure on magnetic properties of amorphous powder core was investigated.The results show that the amorphous powders of the powder core become crystallized with the increase of annealing temperature,and the permeability decreases from 60 to 12,the core loss increases from 0.2 to 0.3 W·cm^(-3),DC-bias characteristic was improved with further increase of annealing temperature,and the magnetic properties become deteriorated due to decrease of permeability and enhancement of coercive force resulting from the crystallization of amorphous powder.展开更多
Amorphous magnetic alloy powders were prepared from bulk metallic glasses Fe74Cr2Mo2Sn2P10Si4B4C2 with supercooled liq-uid region of 32 K by water atomization.Amorphous magnetic powder core precursor was produced from...Amorphous magnetic alloy powders were prepared from bulk metallic glasses Fe74Cr2Mo2Sn2P10Si4B4C2 with supercooled liq-uid region of 32 K by water atomization.Amorphous magnetic powder core precursor was produced from a mixture of the amorphous alloy powder with addition of insulation and bonding materials by mold compacting at room temperature.After annealing the core precursor,the amorphous magnetic core exhibits superior magnetic properties as compared with molypermalloy powder core.The initial permeability up to 1 MHz was about 80,the flux density at 300 Oe was 1.06 T and the core loss at 100 kHz for Bm=0.1 T was only 329 kW/m3.The ultra-low core loss is attributed to the combination of relatively high resistivity and the amorphous structure of the Fe-based amorphous powder.Besides the outstanding magnetic properties,the Fe-based amorphous magnetic powder core had a much lower cost which renders the powder cores a potential candidate for a variety of industrial applications.展开更多
基金This work was financially supported by Beijing Municipal Science and Technology Program(No.D0405003040121).
文摘The influence of micro-structure on magnetic properties of amorphous powder core was investigated.The results show that the amorphous powders of the powder core become crystallized with the increase of annealing temperature,and the permeability decreases from 60 to 12,the core loss increases from 0.2 to 0.3 W·cm^(-3),DC-bias characteristic was improved with further increase of annealing temperature,and the magnetic properties become deteriorated due to decrease of permeability and enhancement of coercive force resulting from the crystallization of amorphous powder.
基金supported by the National Hi-Tech Research and Development Program(Grant No.2001AA327030)Science and Technology Program of Beijing(Grant No.D0405003040121)
文摘Amorphous magnetic alloy powders were prepared from bulk metallic glasses Fe74Cr2Mo2Sn2P10Si4B4C2 with supercooled liq-uid region of 32 K by water atomization.Amorphous magnetic powder core precursor was produced from a mixture of the amorphous alloy powder with addition of insulation and bonding materials by mold compacting at room temperature.After annealing the core precursor,the amorphous magnetic core exhibits superior magnetic properties as compared with molypermalloy powder core.The initial permeability up to 1 MHz was about 80,the flux density at 300 Oe was 1.06 T and the core loss at 100 kHz for Bm=0.1 T was only 329 kW/m3.The ultra-low core loss is attributed to the combination of relatively high resistivity and the amorphous structure of the Fe-based amorphous powder.Besides the outstanding magnetic properties,the Fe-based amorphous magnetic powder core had a much lower cost which renders the powder cores a potential candidate for a variety of industrial applications.
