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采用粉末冶金温压成形技术研制了Fe78Si9B13非晶软磁粉芯,研究了退火处理对该种软磁粉芯的密度、磁导率、磁损耗、品质因数的作用。结果表明,当退火温度为450℃及以上时,磁粉芯已被晶化。在25~400℃范围内,有效磁导率随温度升高而迅速增大,400℃时达到最高值33.9(100 k Hz),随后急剧下降。随着退火的温度升高,磁粉芯的磁损耗逐渐减小,400℃退火时磁损耗达到最低值82.52 W/kg(100 k Hz),然后会随退火温度升高迅速增大。磁损耗经退火后明显比未退火的小。品质因数随退火温度的变化趋势与磁损耗的刚好相反。磁场退火比未加磁场的退火更有利于提高磁粉芯的磁导率和降低磁损耗。
The amorphous soft magnetic powder core Fe78Si9B13 was developed by powder metallurgy warm pressing technology. The effect of annealing on the density, magnetic permeability, magnetic loss and quality factor of the soft magnetic powder core was studied. The results show that when the annealing temperature is 450 ℃ and above, the magnetic powder core has been crystallized. In the range of 25 ~ 400 ℃, the effective permeability increases rapidly with increasing temperature, reaches the highest value of 33.9 (100 k Hz) at 400 ℃ and then drops sharply. With the increase of annealing temperature, the magnetic loss of the magnetic core decreases and the magnetic loss reaches the lowest value of 82.52 W / kg (100 k Hz) at 400 ℃, and then increases rapidly with the increase of annealing temperature. The magnetic loss is significantly smaller than that of the unannealed after annealing. The trend of the quality factor with the annealing temperature is just the opposite of the magnetic loss. Compared with the annealing without magnetic field, the magnetic field annealing is more conducive to improving the magnetic permeability and reducing the magnetic loss of the magnetic powder core.