【摘要】 采用环氧树脂作粘结剂,高纯还原铁粉作原料制备了环形铁粉芯。研究了环氧树脂含量、成型工艺及粉末粒度分布对铁粉芯磁性能的影响。结果表明,在粒度分布为50~150μm的铁粉中添加占其质量2%的环氧树脂于400 MPa下压制成型的铁粉芯拥有较好的磁性能。当外加磁场为400 A/m时,样品中的有效磁导率μe在测试频率范围(30~110 k Hz)内基本保持恒定,其值为105左右。选取粒度分布为50~75μm的铁粉,采用相同工艺制得的铁粉芯在8 000 A/m外加磁场下的起始磁导率μi达83.1,最大磁导率μm达238.1。更多还原

【Abstract】 Iron powder ring cores were fabricated from high purity reduced iron powders using epoxy resin as a binder.Effects of epoxy resin content, molding process and iron particle size distribution on the magnetic performance of the cores were investigated. The results show that iron powder core fabricated with the iron particle size of 50–150 μm and epoxy resin content accounted for 2% by mass of iron powders, pressed under a pressure of 400 MPa has good magnetic properties,whose μe(effective permeability) basically remaines stable at around 105 under an applied magnetic field of 400 A/m and an alternating current frequency of 30–110 k Hz. While using the same process, with the iron particle size of 50–75 μm, theμi(initial permeability) and μm(maximum permeability) of the prepared iron powder core are 83.1 and 238.1 under an applied magnetic field of 8 000 A/m, respectively.更多还原