Sol soaked glass wrapped layer soft magnetism composite material and preparation method thereof

Abstract

The invention discloses a sol soaked glass wrapped layer soft magnetism composite material and a preparation method thereof and relates to a soft magnetic material and a preparation method thereof. By means of the sol soaked glass wrapped layer soft magnetism composite material and the preparation method thereof, the problems that thermal expansion coefficients of inorganic insulating layers and magnetic powder are large in difference, and the thermal expansion coefficients of inorganic insulating layers are invariable are solved. The sol soaked glass wrapped layer soft magnetism composite material is composed of magnetic powder, a silica layer wrapped with magnetic powder, a glass layer wrapped outside the silica layer and a glass sol infiltration layer. The preparation method includes: 1, pretreating the magnetic powder; 2, wrapping the silica layer on the surface of the magnetic powder; 3, wrapping the glass layer outside the silica layer; 4, preparing a blank of soft magnetic composite materials; 5, performing infiltration on the blank of the soft magnetic composite materials through glass sol; and 6, preparing the soft magnetic materials.

Description

technical field [0001] The invention relates to a preparation method of a soft magnetic material. Background technique [0002] Soft magnetic composite material refers to a type of soft magnetic material in which magnetic powders are independent of each other and connected by insulating layer materials. The outstanding advantages of this soft magnetic composite material are low iron loss and three-dimensional isotropic properties under AC magnetic field. Therefore, many components that are difficult to realize with conventional soft magnetic materials can be prepared, and have been used in switched reluctance, resonant inductors, anti-lock brake sensors, electromagnetic drives, brushless DC motors, rotating machinery, low-frequency filters and other fields. The preparation process of soft magnetic composite materials is usually to coat the surface of metal or alloy magnetic powder with an insulating layer of inorganic and organic matter, or to form a composite soft magnetic...

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Problems solved by technology

For the existing organic-coated soft magnetic composite materials, a pressure greater than 800 MPa needs to be applied during its preparation to achieve the required compaction density, but at the same time it must satisfy good saturation magnetic induction and magnetic permeability. rate, it is necessary to anneal the soft magnetic composite material containing the organic coating layer to remove the residual stress of the 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 soft magnetic composite material of the existing inorganic cladding layer, the insulation of the cladding layer cannot meet the requirements, and the existing cladding layer containing P or S is serious to the environmental pollution, so the use of SiO 2 , MgO, SiO 2 Mixture with water, Al 2 o 3 mixed with water, ZrO 2 The inorganic insulating layer prepared by mixing with water, mica powder and water is used as the inorganic coating layer, and the inorganic insulating layer is generally stable at high temperature, which overcomes the disadvantage that the organic coating layer is usually not resistant to high temperature

However, the existing inorganic insulating layer also has disadvantages. The thermal expansion coefficient 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. In an environment with a large temperature difference or during long-term use, the magnetic powder will Thermal stress is generated inside, which leads to the failure of the soft magnetic composite material coated with inorganic materials to have excellent magnetic properties.

These problems restrict the development and application of soft magnetic composite materials.

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