SnO_2添加对近场通讯用NiCuZn铁氧体材料性能的影响及流延磁片制备

Effect of SnO_2 addition on the properties of NiCuZn ferrite materials for near field communication and tape casting of sheets

采用固相反应法制备了NiCuZn铁氧体材料,研究了SnO_2添加对NiCuZn铁氧体材料显微结构及磁性能的影响。结果表明,SnO_2添加有利于降低NiCuZn铁氧体的损耗,并改善其高频磁特性;当SnO_2添加量为0.1 wt%时,NiCuZn铁氧体在13.56 MHz下具有最优的综合性能:μ′=172、μ″=4.85、Q=35,其截止频率fr为43.4 MHz。基于优化的添加剂含量,采用流延工艺制备了厚度为200μm的NiCuZn铁氧体磁片,研究了烧结过程中升温速率对磁片显微结构及磁性能的影响。结果表明,升温速率为2.5℃/min时,磁片在13.56 MHz下具有最高的磁导率和品质因数;经裂片后磁片的磁导率和品质因数分别为148和100,可用于近场通讯和无线充电领域。

The effects of SnO2additive on the microstructure and magnetic properties of NiCuZn ferrites synthetized by solid state reaction method have been studied.The results indicate that SnO2additive is beneficial to reduce the magnetic loss and improve the high frequency magnetic characteristics of NiCuZn ferrites.When the content of SnO2is0.1wt%,NiCuZn ferrites possess the optimized performance:μ′=172,μ″=4.85,Q=35and fr=43.4MHz.Based on the optimum content of SnO2,the NiCuZn ferrites magnetic sheets,with thickness of200μm,have been fabricated by tape casting process.In addition,the effects of heating rate on the microstructure and magnetic properties of the magnetic sheets in the process of sintering have been considered.When the heating rate is2.5℃/min,the magnetic sheets after cracking exhibit maximum permeability and quality factor at13.56MHz,suitable for application areas of near field communication(NFC)and wireless charging