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Soft magnetic composite material of glass insulating layer and preparation method thereof

A technology of soft magnetic composite materials and glass insulation, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems that the magnetic properties of soft magnetic composite materials cannot be improved, and the magnetic properties are stable, so as to achieve improved mechanical properties and excellent magnetic properties. Can effect

Active Publication Date: 2012-02-22
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that the existing soft magnetic composite materials cannot be annealed at high temperature to remove the residual stress generated in the preparation process, and then the magnetic properties of the soft magnetic composite materials cannot be improved, and it cannot be used in environments with large temperature differences or during long-term use. Due to the technical problem of maintaining stable magnetic properties when the material is heated, a soft magnetic composite material with glass as the insulating layer and its preparation method were developed.

Method used

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  • Soft magnetic composite material of glass insulating layer and preparation method thereof
  • Soft magnetic composite material of glass insulating layer and preparation method thereof
  • Soft magnetic composite material of glass insulating layer and preparation method thereof

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specific Embodiment approach 1

[0015] Embodiment 1: The soft magnetic composite material of the glass insulating layer in this embodiment is made by depositing amorphous material on the magnetic powder, and then annealing after cold pressing or hot pressing; the amorphous material is divided into two The film layer, the film layer close to the magnetic powder is composed of the hydrolyzate of the alkoxide, and the other film layer is composed of the hydrolyzate of the alkoxide or the mixture of the hydrolyzate of the alkoxide and the inorganic salt, and the alkoxide is a metal alkoxide or semimetal alkoxides.

[0016] The initial permeability of the soft magnetic composite material can reach more than 200, the maximum permeability can reach more than 900, the saturation magnetic induction can reach 1.5T, the coercive force is less than 250A / m, and the iron loss under the AC magnetic field of 50Hz and 1T Can be less than 3W / Kg.

specific Embodiment approach 2

[0017] Specific embodiment two: the preparation method of the soft magnetic composite material of the glass insulating layer in this embodiment is carried out according to the following steps:

[0018] 1. Mix magnetic powder, coupling agent and organic solvent to obtain mixture A. The mass fraction of coupling agent and magnetic powder in mixture A is 0.01% to 3%, and the volume ratio of organic solvent to magnetic powder is greater than 100. Stir at a speed of 300r / min, add water, the mass ratio of water to coupling agent is 1:1-20, continue stirring for 20-30min to obtain mixture B, the water is deionized water or distilled water;

[0019] Two, alkoxide is dissolved in the solution A that is prepared in the organic solvent, the concentration of alkoxide in the solution A is less than 1 / 10 of the saturation of used alkoxide in the organic solvent, then solution A is added in the mixture B, again in Stir continuously at a speed of 120 to 300 r / min for 5 to 20 minutes at a temp...

specific Embodiment approach 3

[0029] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the magnetic powder in step 1 is a powder containing iron or nickel or cobalt with soft magnetic properties, the crystal structure is crystalline or amorphous, and the average particle diameter is 5 to 500 μm. Other steps and parameters are the same as in the second embodiment.

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Abstract

A preparation method of a soft magnetic composite material containing a glass insulating layer, relates to a preparation method of a soft magnetic composite material. The soft magnetic composite material of the glass insulating layer and the preparation method thereof disclosed by the invention solve technical problems that high-temperature annealing cannot be performed on existing soft magnetic composite materials to remove residual stress generated in the preparation process and to further improve magnetic performance of the soft magnetic composite material and magnetic performance cannot be kept steady all the time when the material emits heat in an environment with a great temperature difference or in long-term use process. The soft magnetic composite material containing the glass insulating layer disclosed by the invention is formed by depositing amorphous substances on magnetic powder and then annealing after cold-pressing or hot-pressing. The soft magnetic composite material containing the glass insulating layer disclosed by the invention has an initial magnetic conductivity up to 200 or more, a maximum magnetic conductivity up to 900 or more, a saturated magnetization intensity up to 1.5 T, and a coercive force less than 250 A / m; and iron loss at 50 Hz and 1 T alternating current magnetic field can be less than 3 W / Kg.

Description

technical field [0001] The invention relates to a soft magnetic composite material and a preparation method thereof. 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. If the magnetic properties of the current soft magnetic composite materials can be further improved, it will help them obtain greater application prospects and create greater economic benefits. [000...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/153H01F1/24
Inventor 武高辉姜龙涛丁伟马康
Owner HARBIN INST OF TECH
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