NiCuZn铁氧体和银内电极的共烧行为

NiCuZn铁氧体正作为磁介质广泛地应用于低烧多层片式电感，因此有必要对其与银内电极的共烧行为进行研究。该文主要介绍NiCuZn铁氧体／银内电极多层复合体共烧过程中的烧结收缩、界面反应、扩散对介质性能的影响。尖晶石结构中存在相当数量的空位，这为银离子提供了一定的溶解度，因此在共烧过程中银对铁氧体的相组成影响较小。银对铁氧体性能的影响体现在两个方面。一方面是由于银具有相对低的烧结温度，从而在烧结过程中起到助烧剂的作用，促进致密化过程，提高烧结体的密度和磁导率；另一方面，银促使铁氧体中的铜在晶界处析出，导致晶界处应力，使磁导率降低，晶粒生长也被一定程度地抑制。

Co-firing Behavior of NiCuZn Ferrite and Silver Internal Electrode

This paper presents the shrinking behaviors,phase transformations,electromagnetic properties and interfacial characters of NiCuZn ferrites / Ag internal electrode multi-layer composites. Spinel structure has large amount of vacancies in its crystal lattice,which supply solubility for doped ions,such as silver,consequently co-firing process with silver has relatively weak effect on the phase purity of NiCuZn ferrite. Silver has played two roles during the co-firing process with NiCuZn ferrite. The one is to enhance permeability by promoting densification process of ferrite due to its relatively low melting temperature. The other is to educe copper ions out of ferrite and induce interfacial stress,which is harmful to permeability.