SnO2添加对低温烧结NiCuZn铁氧体材料耐电流冲击性能的影响

Effects of SnO2 addition on the current shock resistance of low temperature co-fired NiCuZn ferrites

采用传统固相法制备NiZnCu铁氧体,研究了SnO2添加对低温烧结NiCuZn铁氧体材料耐电流冲击性能的影响。不同于直流偏置特性,耐电流冲击是指电流撤销后的特性,文中采取μi×H90%进行表征,研究显示高ΔB(Bs–Br)值可获得良好的耐流冲击特性。添加少量SnO2不利于低温烧结NiCuZn铁氧体材料的耐流冲击特性;而当添加量在1 wt%以上时,晶粒细小、晶界增厚,则有利于提升耐流冲击特性,但此时材料的μi和Bs等主要性能指标却已恶化。

NiCuZn ferrites were prepared by conventional solid reaction process,and effects of SnO2 addition on current shock resistance of the low temperature co-fired NiCuZn ferrites were investigated.Different from the DC bias characteristic,the current shock resistance is the characteristic after the current is removed.It was characterized byμi×H90%.Studies have shown that highΔB(=Bs–Br)values provide a good current shock resistance.When a small amount of SnO2 is added,it is not conducive to the current shock resistance of the low temperature sintered NiCuZn ferrites.When the addition amount is above 1 wt%,the grain size is fine and the grain boundary is thickened,which is advantageous for improving the current shock resistance.However for the addition amount above 1 wt%,the values of Bs andμi at the sometimes droop rapidly,thus the comprehensive properties deteriorate.