Sintering Behavior of Ni‐Cu‐Zn Ferrites for Multilayer Inductors

摘要: The composition of Ni-Cu-Zn ferrites used for multilayer inductors strongly effects shrinkage and sintering behavior. Samples Ni 1-x-y Cu y Zn x Fe 2 O 4 with 0.4≤x≤ 0.6 0≤y≤0.25 were studied. A second set samples less than 50mol% 3 reveal enhanced densification. Ferrite powder morphology is a key issue the fabrication multi-layer devices. Sub-micron powders display activity that results in density ≥ 5 g/cm after at 900°C. Nanosize ferrite prepared by co-precipitation also lead to high density. Shrinkage curves demonstrate starts 700°C maximum occurs 850°C. role Bi as additive was examined; sintered 900°C found. microstructure undergoes dramatic changes if bismuth oxide concentration varied between 0-1%. influence dwell time temperature on densification micro-structural development permeability increases small additions, but reduced Bi-content 0.5%. Maximum observed intermediate doping μ i = 900. High inductance components co-firing tapes