添加剂SiO_(2)和CaCO_(3)对M型锶铁氧体结构及磁性能的影响

Effect of heat treatment of pastes on the structure andproperties of M-type strontium ferrites

采用固相法制备M型锶铁氧体,研究了球磨时间与添加剂含量对M型锶铁氧体微观形貌、晶体结构、磁性能的影响。实验结果显示,随着球磨时间的增加,样品的磁性能呈先增后减的趋势。在球磨时间为16 h时,样品展现出最佳的磁性能,其M_(r)=66.35 A·m^(2)/kg,H c=140.9 KA/m,(BH)_(max)=28.88 kJ/m^(3)。此外,在添加剂含量上的研究同样发现,样品的磁性能呈现先增加后减小的趋势。具体而言,当添加剂为CaCO 3时,最佳的添加量为1%(质量分数),此时(BH)_(max)=29.36 kJ/m^(3),而当添加剂为SiO 2时,最佳添加量为0.2%(质量分数),此时(BH)_(max)=34.63 kJ/m^(3),H c=337.0 KA/m,M r=65.01 A·m^(2)/kg。实验结果表明通过调节球磨时间和添加剂含量可以改善锶铁氧体的孔隙率,进而提高该材料的磁性能。

M-type strontium ferrite was prepared using the solid-phase method.The effects of ball milling time and additive content on the microscopic morphology,crystal structure,and magnetic properties of M-type strontium ferrite were investigated.The experimental results showed that the magnetic properties of the samples increased and then decreased with the increase of ball milling time.After 16 hours of ball milling,the sample demonstrates the most favourable magnetic properties,with H_(c)=140.9 kA/m,M_(r)=66.35 A·m^(2)/kg,and(BH)_(max)=28.88 kJ/m^(3).Furthermore,the study on the additive content shows that the magnetic properties of the sample tend to increase initially and then decrease.When using CaCO_(3) as the additive,the optimal addition amount is 1wt%,resulting in(BH)_(max)=29.36 kJ/m^(3).On the other hand,when using SiO_(2) as the additive,the optimal addition amount is 0.2wt%,resulting in(BH)_(max)=34.63 kJ/m^(3),H_(c)=337.0 kA/m,and M_(r)=65.01 A·m^(2)/kg.The experimental results demonstrate that adjusting the ball milling time and additive content can enhance the porosity of strontium ferrite,thereby improving its magnetic properties.