羰基铁粉/FeSiBCCr复合非晶磁粉芯的性能

Study on the Properties of Carbonyl Iron Powder/FeSiBCCr Composite Amorphous Magnetic Powder Core

随着5G时代的到来,数量庞大的基站建设对低损耗、高频特性、大功率软磁复合磁粉芯的需求不断增长,同时,宽禁带半导体技术的迅速发展对电子器件的小型化、高频化、高功率密度提出了更高的要求。然而,几乎没有软磁材料能够满足第三代宽禁带半导体的外源环境要求,这进一步制约了下一代电子器件的发展。为了满足发展需求,本工作通过将具有高饱和磁化强度(M_(s))的羰基铁粉(Carbonyl iron powder,CIP)与水雾化FeSiBCCr微细非晶粉末复合,成功制备了综合软磁性能优异的FeSiBCCr复合非晶磁粉芯。研究结果表明,与没有复合CIP的FeSiBCCr非晶磁粉芯相比,当CIP含量为20%(质量分数,下同)时,FeSiBCCr复合非晶磁粉芯的M_(s)提高到160 emu/g左右,整体提高约6.7%;在100 Oe外加直流场下,FeSiBCCr复合非晶磁粉芯的直流偏置性能达到72%,提高了10.8%;在0.05 T@100 kHz条件下,FeSiBCCr复合非晶磁粉芯的损耗降低至296 mW/cm^(3),整体降低11.6%;FeSiBCCr复合非晶磁粉芯的有效磁导率和品质因数分别提高到47.0和174,提高了14.6%和9.4%。通过复合不同含量的CIP制备的新型FeSiBCCr复合非晶磁粉芯具有高的饱和磁化强度、低的损耗和良好的直流偏置特性,有望满足高频大电流器件的需要,在高频电磁系统中具有良好的应用前景。

With the advent of the 5G era,the construction of a large number of base stations has an increasing demand for low loss,high frequency characteristics and high-power soft magnetic composite magnetic powder core.Meanwhile,the rapid development of wide band-gap semiconductor technology has put forward higher requirements for the miniaturization,high-frequency and high power density of electronic devices.However,few soft magnetic materials can meet the external environment requirements of third-generation wide band-gap semiconductors,which further restricts the development of next-generation electronic devices.In order to meet the development requirements,FeSiBCCr composite amorphous magnetic powder cores with excellent comprehensive soft magnetic properties were successfully prepared by compounding water-atomized FeSiBCCr fine amorphous powder with carbonyl iron powder(CIP)with high saturation magnetization(M_(s)).The results show that,compared with FeSiBCCr amorphous magnetic powder cores without composite CIP,M s of FeSiBCCr composite amorphous magnetic powder cores increase to about 160 emu/g when the CIP content is 20%(mass fraction,the same below),and the overall improvement is about 6.7%.Under 100 Oe external DC field,the DC-bias performance of FeSiBCCr composite amorphous magnetic cores reaches 72%,which is improved by 10.8%.Under the condition of 0.05 T@100 kHz,the coer loss of FeSiBCCr composite amorphous magnetic powder core is reduced to 296 mW/cm^(3),and the overall decrease is 11.6%.The effective permeability and quality factor of FeSiBCCr composite amorphous magnetic powder cores are increased to 47.0 and 174,respectively,by 14.6%and 9.4%.The new FeSiBCCr composite amorphous magnetic powder cores with the different filling contents of CIP exhibit high M_(s),low core loss and good DC-bias characteristics,which are expected to meet the needs of high-frequency and high-current devices,and thus have a good application prospect in high-frequency electromagnetic systems.