【摘要】 分别以聚乙烯醇缩丁醛酯(PVB)、环氧树脂(ER)和硅树脂(SI)为绝缘粘结(包覆)剂制备FeSiAl磁粉心，分析绝缘粘结剂类型对其微观形貌和电磁性能的影响。结果表明，单独包覆2 wt%绝缘粘结剂的情况下，包覆SI的样品相较于其他样品，具有更高的起始磁导率μi、更低的功率损耗Pcv，样品表面平整光滑；基于高频下损耗与频率关系的测试结果，采用最小二乘法进行曲线拟合，得到高频下FeSiAl磁粉心磁感应强度影响因子m约为3.0，频率影响因子n约为1.5；将PVB和ER分别与SI复合包覆，可减少非磁性粘结剂的总包覆量，提高FeSiAl磁粉心的磁导率，复合包覆0.5 wt%PVB和0.5 wt%SI粘结剂的样品具有较优的综合性能，其室温下μi为73.4,Pcv为63.9 mW/cm~3(50 kHz/50 mT)，比饱和磁化强度σs为141.1 emu/g。更多还原

【Abstract】 FeSiAl magnetic powder cores were prepared by using polyvinyl butyral(PVB), epoxy resin(ER) and silicone resin(SI) as insulation binders, respectively. The effects of insulation binder types on the microstructure and electromagnetic properties of FeSiAl magnetic powder cores were analyzed. The results show that, at 2 wt%, FeSiAl@SI brings about higher initial permeability(μi), lower power loss(Pcv) and smoother surface than the other two. Based on the test results of the relationship between power loss and frequency at high frequency, the least squares method is used for curve fitting. The influence factor of magnetic induction intensity(m) of FeSiAl magnetic powder core is about 3.0, and the frequency influence factor(n) is about 1.5. The composite coating of PVB and ER with SI can reduce the total coating amount of non-magnetic binder and improve the magnetic permeability of FeSiAl magnetic powder core. The sample coated with 0.5 wt% PVB and 0.5 wt% SI binder has better comprehensive performance. At room temperature, the μi is 73.4, the Pcv is 63.9 mW/cm~3(50 kHz/50 mT), and specific saturation magnetization(σs) is 141.1 emu/g.更多还原