A kind of low eddy current loss soft magnetic block material and its manufacturing method

A block material, eddy current loss technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of high cost of magnetic conductive powder, large eddy current loss, uneven magnetic conduction of magnetic conductors, etc., to improve processing and installation efficiency , reduced eddy current loss, and stable magnetic permeability

Inactive Publication Date: 2016-01-20
CHANGCHUN SHIYUE ENERGY SAVING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the problem of eddy current loss in the use of soft magnetic materials, people have adopted many methods, such as dividing silicon steel into mutually insulated sheets and then superimposing them into iron cores, so that eddy currents can only form loops in each narrow sheet-shaped magnetic conductor. Thereby reducing the eddy current loss, but this flake still has a large eddy current loss; patent applications 86102755 and 200480011657.2 etc. propose to mix soft magnetic granular materials with organic insulating media, so that the eddy current can only form a loop in the magnetic particles, which can be further improved Reduce eddy current loss, but more insulating resin needs to be filled between the magnetic particles, so that there are more unevenly distributed non-magnetic conductive media and pore defects in the magnetic conductor, resulting in uneven magnetic conduction of the magnetic conductor, and the cost of the magnetic powder Higher, it is difficult to manufacture larger inductance device cores; in order to solve the problems of large share of insulating resin and defects, patent application 200510091062.9 proposes to heat and oxidize Fe-Si alloy powder through a weak oxidizing atmosphere, so that the surface of the alloy powder forms SiO 2 Insulating dielectric film, and then die sintering to make the method of conducting magnetic core, can make the SiO in the magnetic conducting core 2 The film plays a better insulating role with a small volume between the magnetic conductive particles, but this manufacturing method also has the problems of high powder manufacturing cost and more porosity defects in the magnetic conductive body, and is only suitable for manufacturing small precision Sensing device

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  • A kind of low eddy current loss soft magnetic block material and its manufacturing method

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Embodiment 1

[0045] A silicon steel (Si(wt,%) ≥ 2.8) soft magnetic block material with low eddy current loss is provided. The silicon steel soft magnetic block material is composed of ferrosilicon alloy grains and a silicon oxide dielectric film bonded to the surface of the grains.

[0046] Put a silicon steel (Si(wt,%)≥2.8) slab (length 400mm, width 100mm) with a thickness of 60mm into a silicon-molybdenum electric furnace for heating, and feed a mixed gas with a constant flow rate of 4000ml / min and a pressure of 0.11Mpa , the mixed gas contains 55% oxygen and 45% nitrogen by weight, so that the furnace is heated to 1300°C and kept for 0.5h, and then enters the dynamic diffusion oxidation process.

[0047] Change the gas feeding method to the pulsating flow feeding method, the pulsating frequency is 50Hz, the mixed gas ratio (wt,%) is adjusted to 20 oxygen, 79 nitrogen and 1 water vapor, and the flow rate is 8000ml / min, keep the pressure of the mixed gas at 0.11Mpa and heat the furnace to ...

Embodiment 2

[0051] Provide a low eddy current loss electroslag remelted 0Cr16 corrosion-resistant soft magnetic alloy (chemical composition (wt,%): C≤0.03; Si0.23; Mn0.65; S≤0.02; P≤0.02; Cr16.5; Residual Fe) Cylindrical billet, the size is Φ120×450mm. The material is mainly composed of chromium-iron alloy grains and the main compound combined on the surface of the grains is a chromium oxide dielectric film.

[0052] Put the alloy into the furnace and heat it at 1300°C, feed a mixed gas with a constant gas flow rate of 5000ml / min and a pressure of 0.11Mpa, and its ratio (wt,%) is 60% oxygen and 40% nitrogen. The gas feeding method is changed to the pulsating flow feeding method, the pulsating frequency is 60Hz, the gas mixture ratio (wt,%) is adjusted to 40% oxygen, 59% nitrogen and 1% water vapor, the flow rate is 10000ml / min, and the pressure is maintained 0.11Mpa and heat the furnace to 1330°C for 3 hours, after repeated heating and forging with a deformation of ≤10% each time, it is ...

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Abstract

The invention provides a magnetically soft block alloy polycrystal material with low eddy current loss. The magnetically soft alloy polycrystal consists of crystalline grains and metal compound dielectric films which are formed on interfaces among the crystalline grains. The preparation method for the magnetically soft alloy polycrystal comprises the following steps that: high-resistivity oxide dielectric films are formed on the grain boundaries of an iron-based magnetically soft material in a high temperature oxidizing atmosphere, and the crystalline grains are coated by the oxide dielectric films to be insulated from one another, so that the inside of a large magnetically soft material block is divided into tiny magnetizers which have microsizes, are uniform and are insulated from one another, and the magnetically soft block material with the extremely low eddy current loss is formed. The invention is characterized in that: a nonmagnetic conductive medium has a low volume occupancy rate, defects such as holes and the like are overcome, magnetically soft sections with large volume can be conveniently prepared, the machining efficiency and the installation efficiency of an electromagnet core are improved, and the like.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a grain boundary oxidized soft magnetic material and a manufacturing method thereof. Background technique [0002] Soft magnetic materials are important magnetic materials used in the field of electric power and electronic technology. Research and manufacture of soft magnetic materials with low coercive force, high magnetic permeability and low iron loss is the goal pursued by people. In order to solve the problem of eddy current loss in the use of soft magnetic materials, people have adopted many methods, such as dividing silicon steel into mutually insulated sheets and then superimposing them into iron cores, so that eddy currents can only form loops in each narrow sheet-shaped magnetic conductor. Thereby reducing the eddy current loss, but this flake still has a large eddy current loss; patent applications 86102755 and 200480011657.2 etc. propose to mix soft magnetic granular materials w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147C21D8/12
Inventor 季长涛王灿辉丁兵
Owner CHANGCHUN SHIYUE ENERGY SAVING MATERIAL CO LTD
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