晶粒尺寸对NiZn铁氧体磁芯耐热冲击的影响

Influence of crystalline size on the heat shock resistance of NiZn ferrite magnetic cores

高性能功率电感要求NiZn铁氧体磁芯具有优良的耐热冲击能力和较高的直流叠加性能。通过氧化物法制备了两种不同晶粒尺寸的NiZn铁氧体材料NZ-A和NZ-B,分别制作6mm和2mm尺寸的电感磁芯,并分别对比一般耐热型NiZn铁氧体材料和高Bs型NiZn铁氧体材料。实验结果证明不同尺寸磁芯所用材料的热冲击的失效模式不同。为满足不同尺寸磁芯耐热冲击性能的需求,所设计材料的晶粒尺寸也应不同。

High performance power inductor requires NiZn ferrite core to have excellent heat shock resistance and high DC superposition performance.Two kinds of NiZn ferrite materials NZ-A and NZ-B with different grain sizes were prepared by oxide method.The inductor magnetic cores of 6 mm and 2 mm size were fabricated respectively.The general heat-resistant NiZn ferrite materials and the high-Bs NiZn ferrite materials were compared respectively.The experimental results show that the thermal shock failure modes of materials used in different size cores are different.In order to meet the requirement of heat shock resistance of different size cores,the grain size of the designed materials should also be different.