Effect of heat treatment of pastes on the structure and properties of M-type strontium ferrites
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 sam-ples increased and then decreased with the increase of ball milling time.After 16 hours of ball milling,the sam-ple demonstrates the most favourable magnetic properties,with Hc=140.9 kA/m,Mr=66.35 A·m2/kg,and(BH)max=28.88 kJ/m3.Furthermore,the study on the additive content shows that the magnetic properties of the sample tend to increase initially and then decrease.When using CaCO3 as the additive,the optimal addition amount is 1wt％,resulting in(BH)max=29.36 kJ/m3.On the other hand,when using SiO2 as the additive,the optimal addition amount is 0.2wt％,resulting in(BH)max=34.63 kJ/m3,Hc=337.0 kA/m,and Mr=65.01 A·m2/kg.The experimental results demonstrate that adjusting the ball milling time and additive content can en-hance the porosity of strontium ferrite,thereby improving its magnetic properties.
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