A New Low-Temperature Sintering Method for NiCuZn Ferrite

摘要

Low temperature sintering NiCuZn ferrite was employed at most cases due to its co-firability with Ag (below 960℃). The purpose of this study is to fabricate NiCuZn ferrite sintered body with high-strength and high-frequency magnetic properties. Following is the procedure: firstly, NiCuZn ferrite powder was synthesized under CO_2 atmosphere at 500℃ from the mixed doxalate synthesized by liquid phase deposition method; then a small amount of boric acid [H_3BO_3] was added to the powder, and the NiCuZn ferrite powder compact was prepared with Newton press and CIP methods; finally, NiCuZn ferrite sintered body was fabricated by sintering at 900℃ under CO_2 atmosphere. By this method, NiCuZn ferrite sintered body with 0.5 mass% boric acid was obtained, which was additive with strength 340 MPa, high frequency applied scope below 20MHz and initial permeability 38.