Nickel zinc ferrite low temperature high density production method and its product

Abstract

The invention discloses a method to produce nickel zinc ferrite with lower temperature and high intensity and nickel zinc ferrite with high magnetic permeability produced with the method. The main components of raw materials adopted in the method are converted into 47.5-49.5mol percent Fe2O3, 3.6-6.5mol percent CuO and 30-35mol percent ZnO, and the rest is NiO. Apart from the main components, the others are converted into one of the minor components, including.01-0.4wt percent Ti2O5, 0.01-0.5wt percent Bi2O3, 0.01-0.5wt percent V2O5, 0.01-0.5wt percent MoO3, 0.01-0.5wt percent Cr2O3, and 0.01-0.5wt percent Nb2O5. The finished product is obtained through steps of material batching, mixing, pre-heating, crushing, grain-making, molding, and sintering. Minor components are mixed after the main components are preheated. The method can realize as high intensity as 5.2g / cm3 and above to enhance the magnetic permeability at a sintering temperature of 200 DEG C lower than the current technique. The method can also increase magnetic inversion temperature and saturation magnetic sensing intensity.

Description

technical field [0001] The invention relates to a high-permeability nickel-zinc (NiZn) ferrite and a manufacturing method thereof, in particular to a manufacturing method and a ferrite material of the high-permeability nickel-zinc ferrite that can be sintered at low temperature. Background technique [0002] High permeability NiZn ferrite core can effectively absorb electromagnetic interference signals to achieve the purpose of anti-electromagnetic interference. With the development of electronic products to high frequency, high speed, and high assembly density, anti-EMI cores must be used in various electronic and power circuits. High permeability NiZn ferrite cores have dual advantages, which can greatly reduce the size of the device volume, and can increase the operating frequency. [0003] The sintering temperature of high permeability NiZn ferrite is generally 1050-1200°C. Under the same formulation conditions, the magnetic core sintered body must have a high sintered ...

AI Technical Summary

Problems solved by technology

Although high sintering temperature can achieve high sintering density and high magnetic permeability, it will deteriorate other characteristics, such as key indicators such as saturation magnetic induction

At the same time, in order to obtain high magnetic permeability, the Curie temperature must be lowered during the adjustment process of the formula, and the Curie temperature of the current high-conductivity nickel-zinc ferrite is close to the critical point and cannot be lowered any more.

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