铁基非晶纳米晶磁芯软磁性能优化的厚度效应和抗应力能力

Thickness Effect and Stress Resistance of Soft Magnetic Properties Optimization of Iron-Based Amorphous Nanocrystalline Magnetic Cores

摘要:

为了提高铁基非晶纳米晶带材磁芯的高频软磁性能和抗应力能力，采用单辊甩带工艺制备1K107系列J6铁基非晶合金带材，研究其在氮气和磁场相结合的热处理工艺对不同厚度带材磁芯的软磁性能和抗应力能力的影响。结果表明：经温度560 ℃氮气热处理后，厚度为20和26 μm的纳米晶带材磁芯在工作频率100 kHz时的有效磁导率分别为9.9和10 k、损耗（B_m=0.1 T）分别为9.41和9.79 W?kg^-1；经460 ℃磁场热处理优化后，厚度为20 μm的纳米晶带材磁芯在工作频率100 kHz时的有效磁导率为17 k、损耗为6.08 W?kg^-1；经440 ℃磁场热处理后，厚度为26 μm的纳米晶带材磁芯在100 kHz时的有效磁导率为13.5 k、损耗为7.30 W?kg^-1；当外应力作用时，经温度为460 ℃磁场热处理的20 μm厚的纳米晶带材磁芯在工作频率100 kHz时的有效磁导率由16.2 k降低到9 k，而经温度为440 ℃磁场热处理的26 μm厚的纳米晶带材磁芯在工作频率100 kHz时的有效磁导率由13.6 k降低到6.4 k，当外应力去除后两种纳米晶磁芯的有效磁导率都基本恢复，厚20 μm纳米晶带材磁芯在工作频率100 kHz时的有效磁导率恢复到15.9 k，厚26 μm纳米晶带材磁芯在工作频率100 kHz时的有效磁导率恢复到13.4 k。

Abstract:

In order to improve the high frequency soft magnetic properties and stress resistance of iron-based amorphous nanocrystalline strip magnetic cores， the effect of the combined nitrogen and magnetic field heat treatment process on the soft magnetic properties and stress resistance of strip magnetic cores with different thicknesses was investigated for 1K107 series J6 iron-based amorphous alloy strips prepared by a single-roller strip dumping process. The results show that the effective permeability of the magnetic core of nanocrystalline strips with 20 μm and 26 μm thicknesses after nitrogen heat treatment at 560 °C was 9.9 k and 10 k， respectively， at a frequency of 100 kHz， and the loss was 9.41 W?kg^-1 and 9.79 W?kg^-1 at 100 kHz， respectively （test condition B_m=0.1 T）. The nanocrystalline strip magnetic core with a thickness of 20 μm was optimized by a magnetic field heat treatment at 460 °C. Its effective permeability was improved to 17 k at 100 kHz and the loss was reduced to 6.08 W?kg^-1 at 100 kHz. The nanocrystalline strip magnetic core with a thickness of 26 μm was optimized by a magnetic field heat treatment at 440 °C. Its effective permeability was improved to 13.5 k at 100 kHz， and the loss was reduced to 7.30 W?kg^-1 at 100 kHz. When the external stress is applied， the effective permeability of the magnetic core of a 20 μm-thick nanocrystalline strip heat-treated with a magnetic field at 460 °C was reduced from 16.2 k to 9 k at 100 kHz， and the effective permeability of the magnetic core of a 26-μm-thick nanocrystalline strip heat-treated with a magnetic field at 440 °C was reduced from 13.6 k to 6.4 k at 100 kHz. When the external stress is removed， the effective permeability of the two nanocrystalline cores is basically restored. The effective permeability of the thick 20 μm nanocrystalline magnetic strip cores recovered to 15.9 k at a frequency of 100 kHz and the effective permeability of the thick 26 μm nanocrystalline strip magnetic cores recovered to 13.4 k at a frequency of 100 kHz.