Fe-Si-Ni磁粉芯的制备及其磁性能研究

发布时间：2018-02-26 03:06

  本文关键词： Fe-Si-Ni磁粉芯 有效磁导率 品质因数 直流叠加特性 磁芯损耗　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着电子信息技术的飞速发展,金属磁粉芯被广泛应用于线路滤波器、输出电感和开关电源等领域。金属磁粉芯是将磁性粉末颗粒与非磁性绝缘介质混合均匀后压制成型的一类软磁材料,主要分为铁粉芯、铁硅(Fe-Si)磁粉芯、高磁通(Fe-Ni)磁粉芯、铁硅铝(Fe-Si-Al)磁粉芯、铁硅镍(Fe-Si-Ni)磁粉芯、铁镍钼(MPP)磁粉芯和非晶纳米晶磁粉芯。其中,Fe-Si-Ni磁粉芯作为一种新型金属磁粉芯,近年来得到越来越多的应用,但是关于其制备工艺和性能研究的报道还很少。 本文采用球磨制粉的方法制备了Fe-Si-Ni粉末,然后通过模压成型将其制备成Fe-Si-Ni磁粉芯。研究了粉末的磁性能和钝化处理以及粉末粒度、钝化剂浓度、成型压力、热处理工艺以及粉末预退火对磁粉芯密度ρ、饱和磁感应强度Bs、矫顽力Hc、有效磁导率μe、品质因数Q、直流叠加特性DC-bias和磁芯损耗P的影响。 研究结果发现：随着粉末目数的增加,磁粉芯的密度ρ逐渐减小,品质因数Q逐渐增大。随着钝化剂浓度的升高,磁粉芯的密度ρ、饱和磁感应强度Bs和有效磁导率μe逐渐减小；矫顽力Hc、品质因数Q、直流叠加特性DC-bias和磁芯损耗P逐渐增大。随着成型压力的增加,磁粉芯的矫顽力Hc、直流叠加特性DC-bias和磁芯损耗P逐渐减小；密度ρ、饱和磁感应强度Bs、有效磁导率μe、品质因数Q和抗拉强度逐渐增大。650℃热处理时,随着热处理时间从0h增加到5h,磁粉芯的饱和磁感应强度Bs增大,矫顽力Hc减小,磁芯损耗先减小后增大；而随着热处理温度从550℃升高到750℃,磁粉芯的密度ρ和有效磁导率μe逐渐增大,直流叠加特性DC-bias和磁芯损耗P逐渐减小。 通过以上研究,得出最佳的制备工艺参数：Fe-Si-Ni粉末经过600。C预退火处理1h后进行粒度配比,接着用0.4wt.%的磷酸丙酮溶液进行钝化处理后加入0.5wt.%的W-6C丙酮溶液和0.04wt.%的高岭土进行绝缘粘结包覆,然后加入0.25wt.%的硬脂酸锌和0.25wt.%的硬脂酸钡作润滑脱模剂,在1.86GPa的压力下压制成型,最后将成型的样品放置于氩气保护气氛中750℃热处理1h,制得的Fe-Si-Ni磁粉芯有着优异的综合软磁性能。其饱和磁感应强度为1.23T,有效磁导率为60.96,100kHz时的品质因数为83.72,外加直流磁场强度为100Oe时的直流叠加特性仍可达到48.07%,50kHz,50mT时的磁芯损耗仅为312mW/cm3。
[Abstract]:With the rapid development of electronic information technology, metal magnetic powder cores are widely used in line filters. The metal magnetic powder core is a kind of soft magnetic material which is compacted by mixing the magnetic powder particles with the non-magnetic insulating medium, and is mainly divided into iron powder core, Fe-Si iron powder core, Fe-Ni magnetic powder core with high flux. Fe Si Al Fe Si Al magnetic powder core, Fe Si Ni Fe Si Ni magnetic powder core, Fe Ni Mo (Mo) magnetic powder core and amorphous nanocrystalline powder core are used more and more recently as a new type of metal powder core. However, there are few reports on the preparation process and properties. In this paper, Fe-Si-Ni powder was prepared by ball milling, and then prepared into Fe-Si-Ni core by moulding. The magnetic properties, passivation treatment, particle size, concentration of passivator, molding pressure were studied. The effects of heat treatment and powder pre-annealing on the density of magnetic core 蟻, saturation magnetic induction strength Bs, coercivity HC, effective permeability 渭 e, quality factor Q, DC superposition characteristic DC-bias and core loss P are investigated. The results show that with the increase of the number of powder mesh, the density 蟻 of magnetic powder core decreases, the quality factor Q increases, and the concentration of passivator increases. Density 蟻, saturation magnetic induction intensity Bs and effective permeability 渭 e of magnetic powder core gradually decreased, coercivity HC, quality factor Q, DC superposition characteristic DC-bias and core loss P increased gradually. The coercivity, DC superposition characteristic of magnetic powder core, DC-bias and core loss P decrease gradually, and the density 蟻, saturation magnetic induction intensity Bs, effective permeability 渭 e, quality factor Q and tensile strength increase gradually at .650 鈩，

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