Effect of B_2O_3 Additive on the Magnetic Properties of Anisotropic Barium Ferrite

B_2O_3添加劑對異方性鋇磁體磁性之影響

洪銘盤(M. P. Hung) ； 高森田(S. T. Kao)

《鑛冶：中國鑛冶工程學會會刊》 29卷3期 (1985/09) Pp. 77-80

https://doi.org/10.30069/MM.198509_29(3).0006

摘要

The effect of small amounts of B_2O_3 additive on the magnetic properties of sintered anisotropic barium ferrite was investigated. An increase in both coercivity and energy product with increasing B_2O_3 up to 0.5 w/o is possibly explained by the solid phase BaO-rich Ba borate which acts as a grain growth inhibitor in sintering. A reduction in coercivity with increasing B_2O_3 in excess of 0.5 w/o and increasing sintering temperature is evidently ascribed to the exaggerated grain growth by the liquid phase B_2O_3-rich Ba borate in sintering.

並列摘要

本文探討少量B_2O_3添加量對燒結異方性鋇磁體磁性之影響。B_2O_3添加量增加至0.5w／o，則提高抗磁力及能量積，原因可能係固相的富BaO硼酸鋇阻止磁體晶體成長。B_2O_3添加量超過0.5w／o及提高燒結溫度均使抗磁力及能量積下降，原因係液相的富B_2O_3硼酸鋇促進磁體晶粒過度成長。