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Soft magnetic composite material taking glass powder as coating layer and preparation method of soft magnetic composite material

A soft magnetic composite material, glass powder technology, applied in the direction of inorganic material magnetism, can solve the problem of large difference in thermal expansion coefficient between inorganic insulating layer and magnetic powder, and achieve the effect of improving mechanical properties, improving magnetic properties, and eliminating internal stress

Active Publication Date: 2012-11-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of effectively removing the residual stress in the preparation process by annealing in the existing soft magnetic composite material coated with inorganic materials, which causes the transverse fracture strength of the existing soft magnetic composite material to be less than 70MPa and the inorganic In order to solve the problem that the thermal expansion coefficients of the insulating layer and the magnetic powder are quite different, a soft magnetic composite material with glass powder as the coating layer and its preparation method are provided

Method used

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  • Soft magnetic composite material taking glass powder as coating layer and preparation method of soft magnetic composite material
  • Soft magnetic composite material taking glass powder as coating layer and preparation method of soft magnetic composite material
  • Soft magnetic composite material taking glass powder as coating layer and preparation method of soft magnetic composite material

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specific Embodiment approach 1

[0016] Embodiment 1: The soft magnetic composite material with glass powder as the coating layer provided in this embodiment is composed of magnetic powder, a silicon dioxide layer covering the magnetic powder, and a glass powder layer coated outside the silicon dioxide layer; The magnetic powder is one or a combination of magnetic metal powder, magnetic metal alloy powder and magnetic metal compound powder.

[0017] In the soft magnetic composite material provided in this embodiment with the glass frit as the cladding layer, the composition and proportion of the glass frit layer can be adjusted according to the coefficient of thermal expansion. The thermal expansion coefficients of the two substances in one material do not match, and internal stress is easily generated inside the material when the temperature changes, which in turn reduces the magnetic properties of the soft magnetic composite material. Therefore, in the selection of the cladding layer, the thermal expansion ...

specific Embodiment approach 2

[0020] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the magnetic powder is Fe powder, Ni powder, Co powder, iron alloy powder, nickel alloy powder, cobalt alloy powder, iron-containing oxide powder, nickel-containing oxide One or a combination of powders and cobalt oxide powders are magnetic.

[0021] The iron alloy powder described in this embodiment is an alloy powder composed of iron element and one or more elements, and the mass fraction of iron is the largest, wherein the iron alloy powder can be Fe-Si-Al powder, Fe-Ni-Mo powder, Fe-Ni powder, Fe-Cu-Nb-Si-B powder, Fe-Pt powder, Fe-Ni-Cr powder, Fe-Zn powder, La-Co-Fe powder, Pb-Fe powder, W-Ni-Fe powder Powder and Zr-Ni-Sn-Fe powder or a combination of several of them.

[0022] The nickel alloy powder described in this embodiment is an alloy powder composed of nickel element and one or more elements, and the mass fraction of nickel is the largest, wherein the nickel all...

specific Embodiment approach 3

[0024] Specific implementation mode three: The preparation method of the soft magnetic composite material with glass powder as the coating provided in this implementation mode is specifically completed according to the following steps:

[0025] 1. Put the magnetic powder into the cleaning agent and ultrasonicate at a frequency of 24KHz~35KHz for 10min~20min, filter to obtain the magnetic powder, add ethanol and oleic acid to it, and use ammonia water with a concentration of 20%~30% by mass to adjust the pH value of the solution to Adjust to 8.5~9.5, ultrasonically disperse at a frequency of 24KHz~35KHz for 1 hour~2 hours or stir at a speed of 600r / min~1200r / min for 1 hour~2 hours to obtain a solid-liquid mixture, in which the mass of oleic acid and magnetic powder The ratio is (0.03~0.2):1, the volume ratio of oleic acid and ethanol is 1:(40~75), the magnetic powder is one of magnetic metal powder, magnetic metal alloy powder and magnetic metal compound powder species or a com...

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Abstract

The invention relates to a soft magnetic composite material taking glass powder as a coating layer and a preparation method of the soft magnetic composite material, relating to the soft magnetic material and the preparation method thereof. In the invention, the problem that in the traditional soft magnetic composite material of an inorganic coating layer, excellent mechanical property of the soft magnetic composite material and excellent magnetic property of the soft magnetic composite material resulting from an annealing mean can not coexist, and the difference of coefficients of thermal expansion between an inorganic insulating layer and magnetic powder is greater is solved. The soft magnetic composite material taking the glass powder as the coating layer consists of the magnetic powder, a silicon dioxide layer coated by the magnetic powder and a glass powder layer coated outside the silicon dioxide layer. The preparation method comprises the following steps: firstly, pre-treating the magnetic powder; secondly, coating the silicon dioxide layer on the surface of the magnetic powder; thirdly, coating the glass powder layer outside the silicon dioxide layer; fourthly, preparing a blank material; and fifthly, annealing the blank material. The soft magnetic composite material taking the glass powder as the coating layer and the preparation method of the soft magnetic composite material are applied to the fields of switch magnetic resistance, resonance inductance, anti-lock brake sensors, electromagnetic driving devices, brushless direct current motors, rotating machinery and low-frequency filters.

Description

technical field [0001] The invention relates to a soft magnetic 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. 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...

Claims

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Application Information

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IPC IPC(8): H01F1/20H01F1/24B22F1/02
Inventor 武高辉姜龙涛丁伟
Owner HARBIN INST OF TECH
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