Iron-based amorphous powder and method for preparing coil-embedded integral-forming inductor

Abstract

The invention belongs to the field of powder metallurgy, and particularly relates to iron-based amorphous powder for preparing a coil-embedded integral-forming inductor. The inductor is prepared through the following steps that an iron-based amorphous thin belt obtained through a single-roller rapid quenching method is preheated, and is broken through a mechanical grinding and airflow grinding combined method, amorphous powder is screened in order to obtain the superfine iron-based amorphous powder, stress relieving annealing is conducted on the superfine amorphous powder in vacuum, then the superfine amorphous powder is mixed with a binding agent to conduct insulating coating granulating, coated powder after being granulated and a coil are formed in a compression molding mode to obtain the coil-embedded integral-forming inductor. The superfine iron-based amorphous powder and the coil-embedded integral-forming inductor with an excellent temperature rise character can be prepared through the method.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to an Fe-based amorphous powder and a method for preparing coil-embedded integrally formed inductors from the Fe-based amorphous powder. Background technique [0002] Coil-embedded integrated forming inductor is a new type of power inductor that has emerged in recent years as power supplies tend to develop towards high frequency, low voltage, and high current, especially in notebook computers, tablet computers, and server power supplies. Capacity The power supply circuit of the CPU requires the inductance to be able to carry high frequency and high current requirements. This type of inductance requires the core material to have a high saturation magnetic induction Bs so that the work under high current will not cause inductance saturation, and also requires the core material to have a high resistivity to adapt to the high-frequency working state under MHz. [0003] Alth...

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Problems solved by technology

[0004]At present, traditional soft magnetic alloy powders such as carbonyl iron powder and FeSiCr are generally used as magnetic core materials for coil-embedded integrated inductors, but these materials have high core loss , the temperature rise of the inductor caused by high frequency and high current is high, and although the use of Fe-based amorphous atomized powder can reduce the core loss, the composition of this type of Fe-based amorphous alloy requires a large amorphous composition, and the preparation process The degree of difficulty is relatively large, and it is difficult to apply large-scale industrialization

[0005]The production of Fe-based amorphous thin ribbon by single-roll quenching method has been successfully industrialized, with high saturation magnetic flux density, low coercive force and high economy , the processing cost can be reduced, and complex shaped products can be produced when Fe-based amorphous strips are crushed into powders, but the conventional crushing method obtains amorphous powders with relatively coarse particle size (>50μm), which is suitable for use as The magnetic core of the traditional wire-wound inductor, but it is easy to scratch the insulating layer on the surface of the coil and cause a short circuit when it is used in the one-piece molded inductor embedded in the coil.

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