In order to check the traditional core loss formula, the core loss spectrum P(f) of Co-based amorphous soft magnetic alloy with constant permeability has been studied. It is found that within a high frequency range fr...In order to check the traditional core loss formula, the core loss spectrum P(f) of Co-based amorphous soft magnetic alloy with constant permeability has been studied. It is found that within a high frequency range from 10 kHz to 200 kHz and at Bm = 0. 1 T,the P(f) has the fractal structure P (f) = Po, and with the increasing of induced anisotropy energy Ku, the fractal dimension Dfrises, thus the total power loss at high frequency increases and the frequency characteristic of P(f) becomes worse.展开更多
Soft magnetic composites(SMCs)are effective as magnetic powder cores in an inductor.Due to high saturation magnetization,large magnetocrystalline anisotropy and high operating frequency of M(metal)-RE(rear earth)soft ...Soft magnetic composites(SMCs)are effective as magnetic powder cores in an inductor.Due to high saturation magnetization,large magnetocrystalline anisotropy and high operating frequency of M(metal)-RE(rear earth)soft magnetic composites,it is possible to miniaturize inductor cores by reducing total loss,especially eddy current loss and excess loss at high frequencies.In this article,the characteristics of Ce_(2)Fe_(17)N_(3)/α-Fe(CFN/F)loss per volume and effective permeability reaching a high frequency of 3 MHz are investigated.The biphase CFN/F composite exhibits a high permeability of 16 at 70 MHz,which is two times greater than that of pure Ce_(2)Fe_(17)N_(3)(CFN)powders.The total loss is as low as 545 mW/cm^(3)at 3 MHz and 6 mT.The direct current(DC)-bias properties have a percent of permeability exceeding 65% at H=7960 A/m.This phenomenon indicates that our material has a higher working frequency and lower core loss than other materials;the biphase CFN/F structure is a promising and efficient approach for developing the miniaturized radio frequency(RF)inductor core.展开更多
以正硅酸乙酯(TEOS)为硅源,聚乙烯吡咯烷酮(PVP)为偶联剂,采用溶胶-凝胶法,在Fe Si Cr软磁合金表面包覆上SiO_2壳层。对包覆粉末进行压制成型和退火热处理,制备了高频下低损耗的Fe Si Cr/SiO_2软磁复合材料。通过XRD、FTIR、XPS、SEM等...以正硅酸乙酯(TEOS)为硅源,聚乙烯吡咯烷酮(PVP)为偶联剂,采用溶胶-凝胶法,在Fe Si Cr软磁合金表面包覆上SiO_2壳层。对包覆粉末进行压制成型和退火热处理,制备了高频下低损耗的Fe Si Cr/SiO_2软磁复合材料。通过XRD、FTIR、XPS、SEM等手段对包覆粉末的相结构、成分及表面微结构进行表征,通过四探针电阻仪、B-H分析仪等对复合材料电阻率、磁导率、功率损耗、品质因数等性能参数进行研究。结果表明:通过SiO_2绝缘包覆处理可大幅度提高FeSiCr软磁合金电阻率,降低高频下功率损耗,提高材料品质因数;随着TEOS添加量提高,包覆效果及材料性能呈现先提升后恶化的趋势,添加量为12 m L时,软磁复合材料综合性能最佳。展开更多
采用单辊熔体急冷法制备(Fe1-x Co x)76.9Cu0.6Nb2.5Si11B9(x=0,0.1,0.3,0.5,0.8)的非晶合金,研究了Co含量变化对其纳米晶合金交流磁性的影响。结果表明:在相同退火条件下,随着Co含量的增加,纳米晶合金的低频磁导率下降,弛豫频率升高;(F...采用单辊熔体急冷法制备(Fe1-x Co x)76.9Cu0.6Nb2.5Si11B9(x=0,0.1,0.3,0.5,0.8)的非晶合金,研究了Co含量变化对其纳米晶合金交流磁性的影响。结果表明:在相同退火条件下,随着Co含量的增加,纳米晶合金的低频磁导率下降,弛豫频率升高;(Fe1-x Co x)76.9Cu0.6Nb2.5Si11B9(x=0.8)纳米晶合金的最大弛豫频率可达5×106Hz。不同磁场下杂质浓度是影响(Fe1-x Co x)76.9Cu0.6Nb2.5Si11B9非晶及纳米晶合金钉扎场的主要因素。展开更多
文摘In order to check the traditional core loss formula, the core loss spectrum P(f) of Co-based amorphous soft magnetic alloy with constant permeability has been studied. It is found that within a high frequency range from 10 kHz to 200 kHz and at Bm = 0. 1 T,the P(f) has the fractal structure P (f) = Po, and with the increasing of induced anisotropy energy Ku, the fractal dimension Dfrises, thus the total power loss at high frequency increases and the frequency characteristic of P(f) becomes worse.
基金Project supported by the National Key R&D Program of China(2021YFB3501302)Joint Fund of Equipment Pre-Researchthe Ministry of Science and Technology of China(6141A02033242)。
文摘Soft magnetic composites(SMCs)are effective as magnetic powder cores in an inductor.Due to high saturation magnetization,large magnetocrystalline anisotropy and high operating frequency of M(metal)-RE(rear earth)soft magnetic composites,it is possible to miniaturize inductor cores by reducing total loss,especially eddy current loss and excess loss at high frequencies.In this article,the characteristics of Ce_(2)Fe_(17)N_(3)/α-Fe(CFN/F)loss per volume and effective permeability reaching a high frequency of 3 MHz are investigated.The biphase CFN/F composite exhibits a high permeability of 16 at 70 MHz,which is two times greater than that of pure Ce_(2)Fe_(17)N_(3)(CFN)powders.The total loss is as low as 545 mW/cm^(3)at 3 MHz and 6 mT.The direct current(DC)-bias properties have a percent of permeability exceeding 65% at H=7960 A/m.This phenomenon indicates that our material has a higher working frequency and lower core loss than other materials;the biphase CFN/F structure is a promising and efficient approach for developing the miniaturized radio frequency(RF)inductor core.
文摘以正硅酸乙酯(TEOS)为硅源,聚乙烯吡咯烷酮(PVP)为偶联剂,采用溶胶-凝胶法,在Fe Si Cr软磁合金表面包覆上SiO_2壳层。对包覆粉末进行压制成型和退火热处理,制备了高频下低损耗的Fe Si Cr/SiO_2软磁复合材料。通过XRD、FTIR、XPS、SEM等手段对包覆粉末的相结构、成分及表面微结构进行表征,通过四探针电阻仪、B-H分析仪等对复合材料电阻率、磁导率、功率损耗、品质因数等性能参数进行研究。结果表明:通过SiO_2绝缘包覆处理可大幅度提高FeSiCr软磁合金电阻率,降低高频下功率损耗,提高材料品质因数;随着TEOS添加量提高,包覆效果及材料性能呈现先提升后恶化的趋势,添加量为12 m L时,软磁复合材料综合性能最佳。
文摘采用单辊熔体急冷法制备(Fe1-x Co x)76.9Cu0.6Nb2.5Si11B9(x=0,0.1,0.3,0.5,0.8)的非晶合金,研究了Co含量变化对其纳米晶合金交流磁性的影响。结果表明:在相同退火条件下,随着Co含量的增加,纳米晶合金的低频磁导率下降,弛豫频率升高;(Fe1-x Co x)76.9Cu0.6Nb2.5Si11B9(x=0.8)纳米晶合金的最大弛豫频率可达5×106Hz。不同磁场下杂质浓度是影响(Fe1-x Co x)76.9Cu0.6Nb2.5Si11B9非晶及纳米晶合金钉扎场的主要因素。
