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A method for improving the high-frequency magnetic permeability of fe-based nanocrystalline soft magnetic alloy

A nanocrystalline soft magnetic and magnetic permeability technology, applied in magnetic objects, magnetic materials, furnaces, etc., can solve problems such as the inability to meet high magnetic permeability, and achieve outstanding comprehensive soft magnetic properties, excellent magnetic permeability, and reduced manufacturing. effect with cost

Active Publication Date: 2022-05-31
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the current level of tape production, it is difficult to reduce the thickness of the tape to less than 14 μm in industrial production, and it is impossible to meet the requirements of high magnetic permeability at high frequencies only from the perspective of reducing the thickness of the tape.

Method used

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  • A method for improving the high-frequency magnetic permeability of fe-based nanocrystalline soft magnetic alloy
  • A method for improving the high-frequency magnetic permeability of fe-based nanocrystalline soft magnetic alloy
  • A method for improving the high-frequency magnetic permeability of fe-based nanocrystalline soft magnetic alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Fe 73.5 Si 14 B 8 Cu 1 Nb 3 C 0.5

[0050] When preparing the Fe-based nanocrystalline soft magnetic alloy described in this implementation, it mainly includes the following steps:

[0051] Step 1, using Fe, Si, B, Cu, Nb and FeC alloy raw materials with a purity greater than 99% by mass to carry out weighing and batching according to the nominal composition of the alloy;

[0052] Step 2, mixing the weighed raw materials, using a non-consumable electric arc furnace to prepare a master alloy ingot under an Ar gas atmosphere, and repeatedly smelting the alloy for 4 times to ensure that the composition of the master alloy ingot is uniform;

[0053] Step 3: crush the master alloy ingot and put it into a quartz tube, and use a single-roll strip stripping process to strip the strip at a speed of 40m / s under an Ar gas atmosphere to obtain a quenched alloy with a width of 1.5mm and a thickness of 30μm As for the strip, the X-ray diffractometer (XRD) was used t...

Embodiment 2

[0058] Example 2: Fe73.5 Si 14.25 B 8 Cu 1 Nb 3 C 0.25

[0059] When preparing the Fe-based nanocrystalline soft magnetic alloy described in this implementation, steps 1, 2, and 3 are the same as in Example 1, and the quenched alloy strip is determined to be a complete amorphous structure by XRD, and the T is measured by DSC. x1 , T x1-off and the second crystallization initiation temperature T x2 They are 531°C, 615°C and 696°C, respectively. According to determine T a1 The interval is 630~680℃, T a2 The interval is 540~610℃;

[0060] Step 4 is the same as in Example 1, but the adjustment heat treatment process parameter is: H r =10°C / min, T a1 =650°C, t a1 = 3min; C r =10°C / min, T a2 =560°C, t a2 = 25 min.

[0061] Test the magnetic properties of the nanocrystalline alloy strip after heat treatment, its μ at the frequency of 10kHz and 100kHz e 32900 and 22800 respectively, H c 1.8A / m, B s It is 1.25T. Further experiments to determine the allowable T a2 T...

Embodiment 3

[0062] Example 3: Fe 73.5 Si 13.75 B 8 Cu 1 Mo 3 C 0.75

[0063] When preparing the Fe-based nanocrystalline soft magnetic alloy described in this implementation, it mainly includes the following steps:

[0064] Step 1, using Fe, Si, B, Cu, Mo and FeC alloy raw materials with a purity greater than 99% by mass to carry out weighing and batching according to the alloy composition;

[0065] Step two, three are identical with embodiment 1, and measure quenching alloy strip by XRD and be completely amorphous structure, measure T by DSC x1 , T x1-off and the second crystallization initiation temperature T x2 They are 530°C, 626°C and 680°C, respectively. According to determine T a1 The interval is 630~660℃, T a2 The interval is 540~620℃;

[0066] Step 4 is the same as in Example 1, but the adjustment heat treatment process parameter is: H r =5°C / min, T a1 =645°C, t a1 = 1min; C r =5°C / min, T a2 =580°C, t a2 = 20 min.

[0067] Test the magnetic properties of the na...

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Abstract

The invention provides a method for improving the high-frequency magnetic permeability of Fe-based nanocrystalline soft magnetic alloys, including two aspects of alloy composition and heat treatment process. In terms of composition, the content of the former transition metal element (TM) in the alloy is increased, and C is added; heat treatment In terms of technology, the quenched strip is first raised to 645-665°C at a heating rate of 5-20°C / min, kept at a temperature of 1-5min, and then lowered to 565-585°C at a cooling rate of 5-20°C / min, and kept at a temperature of 20°C. After ~30min, furnace cool or air cool to room temperature to obtain nanocrystalline alloy strips. Compared with the Finemet alloy, the magnetic permeability of the nanocrystalline ribbon prepared by this method can be increased by 17.4% and 41.7% respectively at 10 and 100kHz frequencies, and the alloy does not contain chemically active elements, and does not require high heating / cooling rate heat treatment, which is easy to realize industrialization Production.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for improving the high-frequency magnetic permeability of Fe-based nanocrystalline soft magnetic alloys. Background technique [0002] Modern power, electronic equipment and devices are developing towards miniaturization, energy saving and high frequency, and the soft magnetic properties of iron / magnetic core materials used in electromagnetic conversion are increasingly required. Especially with the popularization of wireless charging technology, there is an urgent need for materials with high magnetic permeability at frequencies of 100 kHz and above. Nanocrystalline soft magnetic alloy has outstanding advantages in the high-frequency field due to its high-frequency magnetic permeability and low loss. It has been applied in high-frequency motors, inductors and other devices. However, the magnetic permeability of existing nanocrystalline soft magnetic alloys at fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D9/52C22C38/00C22C38/02C22C38/16C22C45/02H01F1/153
CPCC21D6/008C21D9/52C22C45/02C22C38/02C22C38/16C22C38/002H01F1/15333H01F1/15341C21D2201/03
Inventor 张伟李艳辉郭瑞陈卫红张继超
Owner DALIAN UNIV OF TECH
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