低温烧结NiCuZn铁氧体材料及叠层片式电感应用研究  

Research on the low temperature co-fired NiCuZn ferrite materials and multilayer chip inductor applications

作　　者：苏桦[1] 张怀武[1] 

机构地区：[1]电子科技大学微电子与固体电子学院,四川成都610054

出　　处：《电子元件与材料》2008年第6期84-85,共2页Electronic Components And Materials

基　　金：国家杰出青年基金资助项目(No.60425102)

摘　　要：从模拟向数字、定频向变频、接插件向平面片式化的方向发展是当前电子信息技术变革的主要方向,而叠层片式电感器件及其相关的低温共烧铁氧体材料,则是实现无源接插件向平面片式化发展的技术瓶颈。通过理论分析、材料研制以及器件应用验证三位一体的研究模式,实现了从材料微观、宏观性能的分析到材料研制途径和工艺优化以及片式器件设计及制备的综合调控,为开发高性能的低温烧结NiCuZn铁氧体材料及叠层片式电感器件奠定理论和实践基础。在理论研究方面,首先分析了决定低温烧结NiCuZn铁氧体材料主要磁性能:包括起始磁导率、品质因数、饱和磁感应强度、居里温度和矫顽力等的关键影响因素,为材料研制过程中如何控制和改善这些磁性能提供了重要的理论指导。然后又从物质迁移的角度探讨了促进NiCuZn铁氧体低温烧结和致密化的有效途径。此外,为了实现低温烧结NiCuZn铁氧体能够根据磁导率目标要求进行材料配方的"量身定制",还结合理论推导和数值拟合得到NiCuZn铁氧体磁导率的半经验计算公式,并基于遗传算法建立配方优化设计程序,大大提高了材料研发的效率和速度。在材料实验研究方面,分别采用了三种方法,即氧化物法、sol-gel法以及复合法对低温烧结NiCuZn铁氧体展开研究。在氧化法材料研制过程中,首先明确了NiCuZn铁氧体配方设计的基本原则,并在此基础上详细研究了主配方中CuO含量对材料烧结特性、微观形貌及电磁性能的影响,确定当主配方中x(CuO)为10.2%时,能较好兼顾材料低温烧结和高电磁性能的要求。此后通过对比实验,详细研究了预烧温度、球磨时间以及升温速率等制备工艺参数对材料烧结特性和电磁性能的影响。确定了低温烧结NiCuZn铁氧体最佳的预烧温度为800℃;最佳的二次球磨时间为24 h;最佳的升温速率应≤2.5℃The main technical revolutions of the electrical information technology are figured of from analog to digital technologies, from fixed frequency to alterative frequency, from plug devices to chip devices. The multilayer chip inductors （MLCI） and the low temperature co-fired ferrites （LTCF） are the key technologies to realize the revolution of the third part. In this dissertation, the investigations are focus on the theories, technics and applications of the LTCF and MLCI. The research mode that combined theoretical analysis, materials preparation and element application are adopted to develop high performance low temperature co-fired NiCuZn ferrite materials, which are very suitable to produce multilayer chip inductors. In the part of theoretical analysis, the key factors to decide magnetic properties of the low temperature co-fired NiCuZn ferrite were investigated firstly, which were very helpful to control and improve these magnetic properties during experiments. Then the fired kinetics of the ferrite were analyzed to give directions to densify the ferrite under low fired temperature. To design compositions of the NiCuZn ferrite by permeability requirement, the expressions to calculate permeability of the ferrite were deduced. Then the genetic algorithm was adopted to optimize compositions of the NiCuZn ferrite, which evidently improved efficiency and speed of new material development.

关 键 词：电子技术 低温烧结 NICUZN铁氧体 氧化物法 SOL-GEL法 复合法 叠层片式电感 

分 类 号：TB32[一般工业技术—材料科学与工程] TN6[电子电信—电路与系统]