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磨加工对初始导磁率μ=3000的锰锌软磁铁氧体材料的EE—19型磁芯的性能的影响十分明显。在不同等级的磨削加工后,其μ值(测电感量L)可相差30～65％,甚至86％之多,究其原因,认为是细磨与抛光减小了磁芯表面的接触间隙从而减小了磁阻Rm;也减薄了残余应力层,而残余应力层将通过材料的磁致伸缩效应而使磁芯的性能恶化。适当的热处理工艺可消除残余应力,恢复材料的磁特性。
The effect of grinding on the performance of the EE-19 core of a Mn-Zn ferrite material with initial permeability μ = 3000 is evident. After different levels of grinding, the μ value (measured inductance L) can vary 30 to 65%, or even 86%, the reason is that the fine grinding and polishing reduce the contact surface of the core gap Thereby reducing the reluctance Rm; also thinning the residual stress layer, and the residual stress layer will deteriorate the performance of the magnetic core through the magnetostrictive effect of the material. Appropriate heat treatment process can eliminate residual stress and restore the magnetic properties of the material.