Soft magnetic composite material, preparation method and application thereof

Abstract

The invention provides a soft magnetic composite material, a preparation method and application thereof. The soft magnetic composite material is prepared by mixing the following raw materials in parts by weight: 90-110 parts of soft magnetic powder, 2-5 parts of an adhesive and 0.1-3 parts of an auxiliary additive, wherein the adhesive is composed of a resin and a curing agent, the auxiliary additive is selected from at least one of carboxyl-terminated nitrile rubber, polysulfide rubber, polyurethane, 650 low-molecular polyamide resin, 651 low-molecular polyamide resin and bisphenol A type unsaturated polyester resin. According to the invention, by optimizing the composition and proportion of raw materials and adding the auxiliary additive into the soft magnetic powder and the adhesive, the auxiliary additive can be grafted to the resin of the adhesive or the curing agent molecular chain to increase the steric hindrance of the reaction of the resin and the curing agent so as to reduce the reaction activity, so that the stability of the soft magnetic composite material can be effectively improved, and the problem of attenuation of the magnetic conductivity of the soft magnetic composite material stored at room temperature for a long time is obviously solved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy manufacturing of metal materials, in particular to a soft magnetic composite material and its preparation method and application. Background technique [0002] Soft magnetic materials are a class of materials that are easy to magnetize and demagnetize, and have very low coercive force. Usually the main characteristics and requirements of such materials are: high saturation magnetic flux density, low coercive force, high magnetic permeability, low (power) loss and good stability. So far, soft magnetic materials have a history of nearly one hundred years of development. Its development and application have led to the development of many related technical fields, especially power electronics technology, and have made outstanding contributions to the progress of society. In the development history of soft magnetic materials, the most representative materials are silicon steel, ferrite, per...

AI Technical Summary

Problems solved by technology

The adhesives used in the soft magnetic composite materials of integrated inductors mostly use epoxy resin adhesives. Due to the partial crosslinking reaction of epoxy resin adhesives during long-term storage at room temperature, resulting in soft magnetic composite materials During the storage process, the problem of magnetic permeability and strength attenuation occurs; in order to improve the magnetic permeability attenuation of soft magnetic composite materials during storage, traditional methods often use refrigeration, but this will greatly increase the soft magnetic composite material. Production cost; or when designing the raw material formula of soft magnetic composite materials, the design value of magnetic permeability is often higher than the target value, giving a certain space for the attenuation of magnetic permeability of soft magnetic composite materials, but this method will sacrifice soft magnetic properties. Electromagnetic properties of the magnetic composite material itself

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