A preparation method of a soft magnetic composite material with high magnetic flux

Abstract

The invention belongs to the technical field of preparation of magnetic functional materials, in particular to a preparation method of a soft magnetic composite material with high magnetic flux. A manganese pyrolusite is prepare from pyrolusite, A manganese dioxide is prepare from orange peel and iron powder, adding ammonium fluoride into the leaching solution, precipitate calcium, magnesium ion,filtering to obtain purified liquid, iron oxide, manganese tetroxide, Zinc oxide and phosphoric acid solution are mixed and ball-milled, A magnetic passivation powder slurry is obtained by passivation, then the magnetic powder is coated with silicon dioxide to obtain bonded magnetic powder, At last, that lubricant is added into the bonded magnetic powder, A soft magnetic composite material with high magnetic flux is obtained, Using the narrow magnetic induction curve of soft magnetic ferrite, The silica on the surface of the magnetic powder has good compatibility with polyethylsilicone resin,good flexibility and elasticity, and can improve the saturated magnetic flux density of the soft magnetic composite material, which has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of preparation of magnetic functional materials, and in particular relates to a preparation method of a high magnetic flux soft magnetic composite material. Background technique [0002] Magnetic materials are widely used in the fields of electronics, computers and communications, and have completely changed our lives today. Different types of magnetic materials including pure iron and its alloys as well as soft and permanent ferrites have been well utilized in the past few decades. With the rapid development of our country's economy, the contradiction between the overexploitation of energy and environmental protection is getting bigger and bigger. Since the beginning of the new century, energy conservation and recycling have become an important way to solve this crisis. [0003] Soft magnetic material is a kind of magnetic functional material, which has the characteristics of high saturation magnetization,...

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Problems solved by technology

[0006] The technical problem mainly solved by the present invention is aimed at the current soft magnetic composite material because the organic coating layer is usually not resistant to high temperature, so it is difficult to effectively remove the residual stress. For the existing soft magnetic composite material of the inorganic coating layer, The insulation of the cladding layer does not meet the requirements, but the existing inorganic insulating layer also has shortcomings. The thermal expansion coefficients of the inorganic insulating layer and the magnetic powder differ greatly, and the thermal expansion coefficient of the inorganic insulating layer itself cannot be changed. Or thermal stress will be generated in the magnetic powder during long-term use, resulting in the defect that the saturation magnetic flux density of the soft magnetic composite material coated with inorganic materials is low, and a method for preparing a high magnetic flux soft magnetic composite material is provided

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