采用粉末冶金技术,以气流破碎Fe78Si9B13非晶粉末为原料制备非晶磁粉芯。利用差示扫描量热仪、X射线衍射仪和B-H分析仪测试样品的热力学参数、相组成和磁性能,研究绝缘剂添加量和退火温度对磁粉芯磁性能的影响。结果表明,增加绝缘剂添加量可以降低磁粉芯的涡流损耗,但绝缘剂过多会降低磁导率和品质因数;去应力退火处理能有效提高磁导率和品质因数,降低磁损耗,但退火温度过高会使非晶磁粉芯晶化,导致磁性能的下降,最佳退火温度为400℃。
The amorphous magnetic powder cores were fabricated by the airflow crashed Fe78Si9B13amorphous powder using power metallurgical technology.Differential thermal analyzer,X-ray diffractometer,B-H analyzer were used to measure the thermodynamic parameters,internal microstructure and magnetic properties for samples.Effects of insulating compound content and annealing temperature on the performance of magnetic powder cores were investigated.The results indicate that: Eddy current loss can be reduced by increasing the insulating compound content,but excessive insulating compound can reduce the magnetic permeability and quality factor.The stress relief annealing could promote permeability and quality factor,reduce the magnetic loss.Over annealing temperature could deteriorate magnetic properties due to crystallization of amorphous power,and the optimum annealing temperature was 400℃.
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