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A kind of high-density alloy magnetic core and its preparation method

A high-density, magnetic core technology, applied in the direction of magnetic core/yoke, transformer/inductor core, inductor/transformer/magnet manufacturing, etc., can solve the problem that the alloy core cannot achieve the expected performance, the density of the alloy core decreases, etc. problems, to achieve the effect of guaranteed performance, improved density and dimensional accuracy, and increased production costs

Active Publication Date: 2022-03-25
广东泛瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conventional alloy magnetic cores are made by pressing, cutting and heat treatment. During heat treatment, due to the decomposition of resin and the volatilization of alloy materials at high temperatures, the density of alloy magnetic cores will decrease, and the density will decrease as the pressing density increases. The trend is more obvious, which eventually leads to the failure of the prepared alloy core to achieve the expected performance

Method used

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  • A kind of high-density alloy magnetic core and its preparation method
  • A kind of high-density alloy magnetic core and its preparation method
  • A kind of high-density alloy magnetic core and its preparation method

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Effect test

Embodiment 1

[0034] A kind of high-density alloy magnetic core, its preparation method comprises the following steps:

[0035] 1) Mixing iron oxide powder and bismuth oxide at a mass ratio of 1:0.05 to obtain a prefabricated green body powder with a sintering temperature of 750°C and a sintering shrinkage rate of 19.5%;

[0036] 2) Mix preform powder and polyvinyl alcohol resin (number average molecular weight: 21000g / mol) according to the mass ratio of 1:0.01, granulate, dry at 100°C for 1.5h, and press under 300MPa pressure to obtain a preform with a hollow structure body (the prefabricated body is in the shape of a cuboid with cylindrical holes inside; the density of the prefabricated body is 65% of the theoretical density; the structural diagram of the prefabricated body is shown in figure 1 shown);

[0037] 3) Mix FeSiCr powder with a particle size of 6 μm to 55 μm and a Ti coating with a thickness of 15 nm on the surface and polyvinyl alcohol resin (number average molecular weight 2...

Embodiment 2

[0040] A kind of high-density alloy magnetic core, its preparation method comprises the following steps:

[0041] 1) Mix magnesium oxide powder, bismuth oxide and copper oxide in a mass ratio of 1:0.03:0.03 to obtain a prefabricated green body powder with a sintering temperature of 830°C and a sintering shrinkage rate of 21%;

[0042] 2) Mix prefabricated body powder, polyvinyl alcohol resin (number average molecular weight 21000g / mol) and acrylic resin (number average molecular weight 19000g / mol) according to the mass ratio of 1:0.03:0.03, granulate, and dry at 100°C for 1.5h. Squeeze under 300MPa pressure, obtain the prefabricated green body of hollow structure (prefabricated green body is cuboid shape, and cylindrical hole is arranged inside; The density of prefabricated green body is 50% of theoretical density; The structural representation of prefabricated green body is as follows figure 1 shown);

[0043] 3) Mix FeSi powder with a particle size of 6 μm to 55 μm and a su...

Embodiment 3

[0046] A kind of high-density alloy magnetic core, its preparation method comprises the following steps:

[0047] 1) Mix NiZn ferrite powder, bismuth oxide and calcium oxide at a mass ratio of 1:0.03:0.03 to obtain a prefabricated body powder with a sintering temperature of 800°C and a sintering shrinkage rate of 18.5%;

[0048] 2) Mix prefabricated body powder and acrylic resin (number average molecular weight 19000g / mol) according to the mass ratio of 1:0.05, granulate, dry at 90°C for 3 hours, and press under 300MPa pressure to obtain a hollow structure prefabricated body (prefabricated The green body is in the shape of a cuboid with cylindrical holes inside; the density of the prefabricated green body is 60% of the theoretical density; the structural diagram of the prefabricated green body is as follows figure 1 shown);

[0049] 3) Mix FeNi powder with a particle size of 6 μm to 55 μm and a Cr coating with a thickness of 10 nm on the surface and acrylic resin (number aver...

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Abstract

The invention discloses a high-density alloy magnetic core and a preparation method thereof. The preparation method of the high-density alloy magnetic core of the present invention comprises the following steps: 1) mixing metal oxide powder and sintering aid to obtain prefabricated body powder; 2) mixing prefabricated body powder and resin, granulating and drying and pressing to obtain a prefabricated body with a hollow structure; 3) mixing magnetic powder and resin to obtain a magnetic core powder with a sintering shrinkage rate smaller than that of the prefabricated body powder; 4) putting the prefabricated body into a mold, and then injecting the magnetic core powder into the mold and the prefabricated body to obtain a composite green body, deglue and sinter, and then separate the magnetic core to obtain a high-density alloy magnetic core. The invention prepares an alloy magnetic core with high density and high dimensional precision by improving the material composition and preparation process, and the production cost will not increase while the density and dimensional precision are improved, fully satisfying high frequency and high current The application requirements of the power supply inductance device.

Description

technical field [0001] The invention relates to the technical field of magnetic cores, in particular to a high-density alloy magnetic core and a preparation method thereof. Background technique [0002] With the development of electronic technology, the current requirements of the power supply are getting higher and higher. The alloy core has a saturation magnetization much larger than that of the ferrite core, which is more in line with the requirements of the power supply for the device. Therefore, the application of the alloy core is becoming wider and wider. . Alloy magnetic cores usually belong to magnetic powder cores, and the higher the density, the better the performance of alloy magnetic cores. However, conventional alloy magnetic cores are made by pressing, cutting and heat treatment. During heat treatment, due to the decomposition of resin and the volatilization of alloy materials at high temperatures, the density of alloy magnetic cores will decrease, and the de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F3/00H01F27/24
CPCH01F41/02H01F3/00H01F27/24
Inventor 杨明雄
Owner 广东泛瑞新材料有限公司
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