铁硅磁粉芯的制备及其性能研究
发布时间：2018-07-28 18:30
【摘要】：Fe-6.5%Si合金磁粉芯由于具有高的饱和磁感应强度、优异的直流叠加特性和相对较低的成本,被广泛的应用于高频电路。本文结合铁硅磁粉芯产品应用的性能指标需求和企业规模生产工艺特点,考察了形貌、粒度配比、绝缘包覆、压制成型以及热处理工艺对磁粉芯有效磁导率、直流叠加性能和单位体积功耗的影响,并利用典型有效磁导率金属磁粉芯进行了单端正激电路扼流圈的应用设计研究,取得的主要研究结果如下:相对于机械破碎法制备的铁硅合金粉末,气雾化Fe-6.5%Si粉末具有较高的饱和磁化强度和较低的矫顽力等优点,相同制备工艺条件下制备的磁芯具有更低的损耗和更好的直流叠加特性。合金粉末的颗粒尺寸减小,磁粉芯样品的有效磁导率相应地降低、品质因数明显增大,其直流叠加性能也相应地得到改善。设计的改性硅溶胶包覆工艺能有效改善合金粉末的表面包覆效果;且包覆液用量增加,磁粉芯样品的有效磁导率相应地降低、直流叠加性能提高,但损耗表现出先减小再增大的趋势;当包覆液用量为1.0 wt%时,样品的恒定磁导率为78,50kHz、500Gs条件下的功耗为189mW/cm3,直流叠加场为100Oe时磁导率百分比为55%。成型压力在1287Mpa~1931Mpa范围内与铁硅磁粉芯的密度成正比,增大成型压力可以提高铁硅磁粉芯的有效磁导率,同时降低磁芯的损耗。在氮气气氛、420℃~540℃热处理条件下,有效磁导率随温度升高先增大后减小,在500℃时具有相对较高的有效磁导率并表现出良好的频率恒定特性,同时直流叠加性能、Q值与磁芯损耗也表现最佳。利用多次包覆工艺可在合金粉末表面形成复合结构包覆层,使铁硅磁粉芯的性能得到进一步优化,即磁芯的有效磁导率为57,损耗为186.44mW/mm3,直流叠加场为10 Gs时磁导率百分比为73.57%。应用设计方面,获得了单端正激电路扼流圈的金属磁粉芯规格、绕线参数等。
[Abstract]:Fe-6.5%Si alloy powder cores are widely used in high frequency circuits due to their high saturation magnetic induction strength, excellent DC superposition characteristics and relatively low cost. In this paper, the effective permeability of ferrosilicon magnetic core was investigated by combining with the requirement of performance index and the characteristics of enterprise scale production technology, such as morphology, particle size ratio, insulation coating, compaction molding and heat treatment, etc. The effect of DC superposition performance and power consumption per unit volume is studied, and the application design of single terminal forward circuit choke is studied by using typical effective permeability metal magnetic powder core. The main results obtained are as follows: compared with the Fe-Si alloy powder prepared by mechanical crushing, the gas-atomized Fe-6.5%Si powder has the advantages of high saturation magnetization and low coercivity. The core prepared under the same preparation process has lower loss and better DC superposition characteristics. The particle size of the alloy powder decreases, the effective permeability of the magnetic powder core decreases correspondingly, the quality factor increases obviously, and its DC superposition property is improved accordingly. The modified silica sol coating process can effectively improve the surface coating effect of the alloy powder, and the effective permeability of the magnetic powder core sample decreases correspondingly, and the DC superposition property increases with the increase of the amount of the coating liquid. When the amount of coating liquid is 1.0 wt%, the constant permeability of the sample is 189mW / cm ~ (3) under the condition of 78g / 50kHz / 500Gs, and the percentage of permeability of the sample is 55mm / cm ~ (-3) when the DC superposition field is 100Oe. The forming pressure is proportional to the density of iron-silicon magnetic powder core in the range of 1287Mpa~1931Mpa. Increasing the forming pressure can increase the effective permeability of iron silicon magnetic powder core and reduce the loss of the core at the same time. Under the condition of heat treatment at 420 鈩，
本文编号：2151225
[Abstract]:Fe-6.5%Si alloy powder cores are widely used in high frequency circuits due to their high saturation magnetic induction strength, excellent DC superposition characteristics and relatively low cost. In this paper, the effective permeability of ferrosilicon magnetic core was investigated by combining with the requirement of performance index and the characteristics of enterprise scale production technology, such as morphology, particle size ratio, insulation coating, compaction molding and heat treatment, etc. The effect of DC superposition performance and power consumption per unit volume is studied, and the application design of single terminal forward circuit choke is studied by using typical effective permeability metal magnetic powder core. The main results obtained are as follows: compared with the Fe-Si alloy powder prepared by mechanical crushing, the gas-atomized Fe-6.5%Si powder has the advantages of high saturation magnetization and low coercivity. The core prepared under the same preparation process has lower loss and better DC superposition characteristics. The particle size of the alloy powder decreases, the effective permeability of the magnetic powder core decreases correspondingly, the quality factor increases obviously, and its DC superposition property is improved accordingly. The modified silica sol coating process can effectively improve the surface coating effect of the alloy powder, and the effective permeability of the magnetic powder core sample decreases correspondingly, and the DC superposition property increases with the increase of the amount of the coating liquid. When the amount of coating liquid is 1.0 wt%, the constant permeability of the sample is 189mW / cm ~ (3) under the condition of 78g / 50kHz / 500Gs, and the percentage of permeability of the sample is 55mm / cm ~ (-3) when the DC superposition field is 100Oe. The forming pressure is proportional to the density of iron-silicon magnetic powder core in the range of 1287Mpa~1931Mpa. Increasing the forming pressure can increase the effective permeability of iron silicon magnetic powder core and reduce the loss of the core at the same time. Under the condition of heat treatment at 420 鈩，
本文编号：2151225
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