工艺参数对Fe-3Si-0.5Al-2Ni-2Ti磁粉心性能的影响

Effects of process parameters on the properties of Fe-3Si-0.5Al-2Ni-2Ti magnetic powder core

采用气雾化制粉和模压成型方法制备了Fe-3Si-0.5Al-2Ni-2Ti磁粉心,通过扫描电镜、X射线衍射仪以及软磁交流测量装置观察并表征了软磁合金粉末的形貌、相结构以及磁粉心的磁特性,探讨了粉末粒度、绝缘剂添加量、退火温度对磁粉心的有效磁导率μe、功耗Pcv的影响。结果表明,随着粉末粒度的减小,磁粉心的有效磁导率μe、功耗Pcv降低;随着绝缘剂含量的增加,有效磁导率μe、功耗Pcv降低;随着退火温度的变化,磁粉心有效磁导率μe及功耗Pcv在不同的温度阶段表现出不同的变化规律,当温度由180℃升至280℃,磁粉心μe缓慢升高,而功耗Pcv则明显降低;当温度进一步升至380℃,磁粉心有效磁导率μe出现大幅降低,而功耗Pcv则急剧升高。

Fe-3Si-0.5AI-2Ni-2Ti soft magnetic alloy powders were prepared by gas atomization, and subsequently magnetic powder core was obtained by compression molding of the powders. The morphology and phase composition of the alloy powders were analyzed by scanning electron microscopy and X-ray diffraction. The magnetic properties of the magnetic powder core were measured by soft magnetic alternating current measurement. The effects of powder size, content of insulation binder, and annealing temperature on effective magnetic permeability and power loss of powder core have been studied, respectively. The results showed that the effective magnetic permeability and loss of the core decrease with decrease of powder size. With increase of content of insulation binder, the effective magnetic permeability and loss of the sample decrease. When the temperature increases from 180℃ to 280℃, the effective magnetic permeability increases slightly and the loss decreases apparently. When the annealing temperature reaches 380℃ the effective permeability decreases sharply and the loss increases apparently.