CN113192742A - Preparation method of soft magnetic powder core with built-in cooling mechanism - Google Patents
Preparation method of soft magnetic powder core with built-in cooling mechanism Download PDFInfo
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- CN113192742A CN113192742A CN202110471801.6A CN202110471801A CN113192742A CN 113192742 A CN113192742 A CN 113192742A CN 202110471801 A CN202110471801 A CN 202110471801A CN 113192742 A CN113192742 A CN 113192742A
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Abstract
The invention relates to a metal soft magnetic powder core with a built-in cooling mechanism, and belongs to the technical field of preparation of metal soft magnetic powder cores. The specific technology is as follows: a heat pipe cooling mechanism is arranged in the metal soft magnetic powder core, the annular evaporation end is positioned in the powder core, and the condensation end is positioned outside the powder core; when the soft magnetic powder core of metal works and generates heat, the cooling liquid in the red copper heat pipe radiator is heated and gasified, the phase change is generated to take away heat, the gaseous substance meets cold and liquefies after reaching the condensation end and returns to the evaporation end again, the evaporation process and the condensation process are continuously circulated, and the heat dissipation effect is achieved. The invention utilizes the powder with different grain diameters for proportioning, and can greatly reduce the molding pressure of the powder core on the premise of ensuring the performance of the powder core, thereby leading a small cooling mechanism into the soft magnetic powder core without damaging the soft magnetic powder core. The heat pipe radiator in the metal soft magnetic powder core has the characteristics of small volume and light weight, does not need an external pipeline, and avoids serious limitation on the applicable condition of the powder core caused by larger volume of a common cooling system.
Description
Technical Field
The invention belongs to the technical field of preparation of metal soft magnetic powder cores, and particularly relates to a preparation method of a soft magnetic powder core with a built-in cooling mechanism.
Background
Soft magnetic materials have been receiving wide attention since their appearance, and are widely used in the fields of electronic power, information communication, transportation, and the like by virtue of excellent magnetoelectric properties. At present, power electronic devices are rapidly developing towards miniaturization, high frequency, high power and high efficiency, which also puts higher demands on soft magnetic materials.
When the soft magnetic material is applied in an alternating field, on one hand, hysteresis loss is generated because the change of magnetic induction intensity lags behind the change of a magnetic field, on the other hand, induced potential is also generated because of the change of magnetic flux, eddy current is formed in the material, so that eddy current loss is generated, and in addition, residual loss generated by phenomena such as domain wall resonance, natural resonance and the like is also generated, and the loss can be basically ignored in a common range.
The loss of the soft magnetic material is usually dissipated in the form of heat energy, but when the loss is too high, the dissipation of the heat energy is difficult to counteract the generation of the loss heat, and the heat energy is accumulated in the material to cause the temperature rise of the electronic power element, so that the performance stability of the element can be influenced, and other devices around the element can be burnt, thereby causing the faults and damages of the whole instrument and equipment, and causing great potential safety hazards to industrial production.
At present, in some fields, a powder core prepared from soft magnetic powder is used to replace soft magnetic alloy at medium and high frequencies, and gaps among the powder and an insulating layer are used to increase the resistivity, so that the eddy current loss is reduced to a certain extent, and the generation of heat is reduced. However, as the frequency of application of the powder core increases, the eddy current loss still increases sharply, causing significant heating of the device. There is still a need to find a suitable way to increase the dissipation of the heat lost from the powder core and avoid the effect of heat build-up on the performance of the component.
Disclosure of Invention
The invention provides a method for preparing a metal soft magnetic powder core with a built-in cooling mechanism, which aims to solve the problem that the existing metal soft magnetic powder core coil seriously heats under the conditions of high frequency and high power.
A metal soft magnetic powder core with a built-in cooling mechanism is provided with a heat pipe cooling mechanism inside; the cooling device is a red copper heat pipe radiator and consists of an annular evaporation end and a rod-shaped condensation end, the evaporation end is positioned inside the powder core, and the condensation end is positioned outside the powder core;
when the soft magnetic powder core of metal works and generates heat, the cooling liquid in the red copper heat pipe radiator is heated and gasified, the phase change is generated to take away heat, the gaseous substance meets cold and liquefies after reaching the condensation end and returns to the evaporation end again, the evaporation process and the condensation process are continuously circulated, and the heat dissipation effect is achieved.
The working medium in the red copper heat pipe radiator is methanol cooling liquid.
The preparation operation steps of the soft magnetic powder core with the built-in cooling mechanism are as follows:
(1) preparation of the powder mixture
Screening the iron-based powder into three grades, wherein the iron-based powder is screened by a first grade of 60-120 meshes, screened by a second grade of 350-400 meshes and screened by a third grade of 1000-9500 meshes;
taking 130-140 g of first-level iron-based powder, 10-20 g of second-level iron-based powder and 50g of third-level iron-based powder, and mixing for 15-25 min in a mixer to obtain mixed powder;
(2) preparation of pug
Adding 16-20 g of epoxy resin and 0.9-1 g of zinc stearate into 20g of mixed powder, uniformly stirring, and stirring for 20min to obtain pug;
(3) preparation of a Green body of Soft magnetic powder core
Spraying a release agent on the inner wall of a cavity of the bar powder core mould, and placing a cooling mechanism in the middle position to ensure that an evaporation end of the cooling mechanism is positioned in the cavity of the powder core mould and a condensation end is positioned outside the cavity of the bar powder core mould; slowly extruding the pug into a mold under the low forming pressure of 200MPa, wherein the temperature of the mold is 100 ℃, and the pressure maintaining time is 3min, so as to obtain a soft magnetic powder core green body with a built-in cooling system;
(4) preparation of metallic soft magnetic powder core
Vacuum drying the soft magnetic powder core green blank to obtain a metal soft magnetic powder core with a built-in cooling mechanism; the density of the magnetic powder part of the metal soft magnetic powder core is 5.5-6.8 g/cm3。
And curing the soft magnetic powder core green blank in a vacuum drying oven at the curing temperature of 150 ℃ for 6 hours. After solidification, obtaining a metal soft magnetic powder core with a built-in heat pipe cooling system; the density of the magnetic powder part of the metal soft magnetic powder core is 5.75-6.71g/cm3。
FIG. 1 is a schematic diagram of a metal soft magnetic powder core design principle model, wherein an evaporation end of an annular heat pipe with a proper size is arranged in the metal soft magnetic powder core, and a cooling end is arranged outside one side of the metal soft magnetic powder core; when the metal soft magnetic powder core is heated in work, the working medium in the heat pipe changes phase to take away heat, and the working medium is cooled and liquefied after reaching the condensation end and returns to the evaporation end in the metal soft magnetic powder core again.
FIG. 2 is a photograph of a metal soft magnetic powder core in the form of a ring, which is uniform and dense, has no obvious damage to the surface, and the heat pipe leading-out end remains intact during molding without deformation and breakage, and has expected functions.
The further technical scheme is as follows:
the iron-based powder is more than one of iron-silicon powder, iron-silicon-aluminum powder or carbonyl iron powder.
Vacuum curing conditions: the vacuum degree is-0.1 MPa, the curing temperature is 150 ℃, and the time is 6 h.
The beneficial technical effects of the invention are embodied in the following aspects:
1. the invention utilizes the powder with different grain diameters for proportioning, and can greatly reduce the molding pressure of the powder core on the premise of ensuring the performance of the powder core, thereby leading a small cooling mechanism into the soft magnetic powder core without damaging the soft magnetic powder core;
2. the invention combines the heat pipe radiator with the powder core in the molding process on the basis of reducing the molding pressure intensity by grading powder. When the soft magnetic powder core runs in a high-frequency environment to generate a large amount of heat, the evaporation end of the heat pipe radiator positioned in the powder core is heated, the cooling liquid in the heat pipe radiator is gasified to take away and dissipate the heat, and the gas returns to the evaporation end again after meeting the cold liquefaction after reaching the condensation end of the heat pipe outside the powder core. The circulation process of evaporation and condensation ensures that the powder core is at a lower working temperature, which is beneficial to the stability of the working performance of the powder core, and meanwhile, the heat pipe radiator in the powder core has the characteristics of small volume and light weight, does not need an external pipeline, and avoids serious limitation on the application condition of the powder core caused by larger volume of a common cooling system.
Drawings
FIG. 1 is a three-dimensional model of a metal soft magnetic powder core with a built-in heat pipe cooling mechanism.
FIG. 2 is a photograph showing the appearance of the soft magnetic metal powder core with a built-in heat pipe cooling mechanism.
Detailed Description
The present invention will be described with reference to specific examples.
Example 1
The preparation method of the metal soft magnetic powder core with the built-in heat pipe cooling mechanism comprises the following operation steps:
(1) preparing mixed powder
Sieving iron silicon powder into three stages, wherein the first-stage iron silicon powder is sieved by a sieve of 60-120 meshes, the second-stage iron silicon powder is sieved by a sieve of 350-400 meshes, and the third-stage iron nickel powder is sieved by a sieve of 1000-9500 meshes;
130g of primary ferrosilicon powder, 20g of secondary ferrosilicon powder and 50g of tertiary ferronickel powder are taken to obtain 200g of powder.
And pouring the iron-based powder of each level into a mixer to mix for 15min to obtain mixed powder.
(2) Preparation of pug
Adding 16g of epoxy resin and 0.9g of zinc stearate, and uniformly stirring for 20min by using a stirrer to obtain pug.
(3) Preparation of the Green bodies
Spraying a release agent on the inner wall of a cavity of a bar powder core mould, and placing a red copper heat pipe radiator at the central position, wherein the red copper heat pipe radiator consists of an annular evaporation end and a rod-shaped condensation end, the evaporation end is positioned inside the powder core, and the condensation end is positioned outside the powder core; the working medium in the red copper heat pipe radiator is methanol cooling liquid. And slowly extruding the pug into a mold under the low forming pressure of 200MPa, wherein the temperature of the mold is 100 ℃, and the pressure maintaining time is 3min, so as to obtain the soft magnetic powder core green body with the built-in heat pipe cooling mechanism.
(4) Preparation of metallic soft magnetic powder core
And (3) putting the green blank into a vacuum drying oven for curing at the temperature of 150 ℃ for 6 hours. After solidification, obtaining a metal soft magnetic powder core with a built-in heat pipe cooling mechanism, referring to fig. 1 and fig. 2; the density of the magnetic powder part of the metal soft magnetic powder core is 6.71g/cm3。
When the metal soft magnetic powder core works and heats, the working medium in the red copper heat pipe radiator changes phase to take away heat, and the working medium is cooled and liquefied after reaching a condensation end and returns to an evaporation end in the metal soft magnetic powder core again, so that the metal soft magnetic powder core works circularly to realize heat dissipation of the metal soft magnetic powder core.
Example 2
The preparation method of the soft magnetic powder core with the built-in heat pipe cooling mechanism comprises the following operation steps:
(1) preparing mixed powder
Sieving the ferrosilicon aluminum powder into two stages, wherein the first-stage ferrosilicon aluminum powder is sieved by a sieve of 100 meshes-150 meshes, the second-stage ferrosilicon aluminum powder is sieved by a sieve of 350 meshes-400 meshes, and the third-stage powder is carbonyl iron powder and is sieved by a sieve of 2500 meshes-11500 meshes;
140g of primary ferrosilicon aluminum powder, 10g of secondary ferrosilicon aluminum powder and 50g of tertiary carbonyl iron powder are taken to obtain 200g of powder.
And pouring the iron-based powder of each level into a mixer to mix for 25min to obtain mixed powder.
(2) Preparation of pug
Adding 20g of epoxy resin and 1g of zinc stearate, and uniformly stirring for 25min by using a stirrer to obtain pug.
(3) Preparation of the Green bodies
And (3) spraying a release agent on the inner wall of the cavity of the strip powder core mould, and placing a red copper heat pipe radiator at the central position, wherein the red copper heat pipe radiator of the embodiment is the same as the embodiment 1. And slowly extruding the pug into a mold under the low forming pressure of 220MPa, wherein the temperature of the mold is 120 ℃, and the pressure maintaining time is 3min, so as to obtain the soft magnetic powder core green body with the built-in heat pipe cooling mechanism.
(4) Preparation of metallic soft magnetic powder core
And (3) putting the green blank into a vacuum drying oven for curing at the temperature of 180 ℃ for 5 hours. After solidification, obtaining a metal soft magnetic powder core with a built-in heat pipe cooling mechanism; the density of the magnetic powder part of the metal soft magnetic powder core is 5.75g/cm3。
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A metal soft magnetic powder core with a built-in cooling mechanism is characterized in that: a heat pipe cooling mechanism is arranged in the metal soft magnetic powder core; the cooling device is a red copper heat pipe radiator and consists of an annular evaporation end and a rod-shaped condensation end, the evaporation end is positioned inside the powder core, and the condensation end is positioned outside the powder core;
when the soft magnetic powder core of metal works and generates heat, the cooling liquid in the red copper heat pipe radiator is heated and gasified, the phase change is generated to take away heat, the gaseous substance meets cold and liquefies after reaching the condensation end and returns to the evaporation end again, the evaporation process and the condensation process are continuously circulated, and the heat dissipation effect is achieved.
2. A soft magnetic powder core with a built-in cooling mechanism according to claim 1, wherein: the working medium in the red copper heat pipe radiator is methanol cooling liquid.
3. A method for preparing a soft magnetic powder core with a built-in cooling mechanism according to claim 1, characterized by the following operating steps:
(1) preparation of the powder mixture
Screening the iron-based powder into three grades, wherein the iron-based powder is screened by a first grade of 60-120 meshes, screened by a second grade of 350-400 meshes and screened by a third grade of 1000-9500 meshes;
taking 130-140 g of first-level iron-based powder, 10-20 g of second-level iron-based powder and 50g of third-level iron-based powder, and mixing for 15-25 min in a mixer to obtain mixed powder;
(2) preparation of pug
Adding 16-20 g of epoxy resin and 0.9-1 g of zinc stearate into 20g of mixed powder, uniformly stirring, and stirring for 20min to obtain pug;
(3) preparation of a Green body of Soft magnetic powder core
Spraying a release agent on the inner wall of a cavity of the bar powder core mould, and placing a cooling mechanism in the middle position to ensure that an evaporation end of the cooling mechanism is positioned in the cavity of the powder core mould and a condensation end is positioned outside the cavity of the bar powder core mould; slowly extruding the pug into a mold under the low forming pressure of 200MPa, wherein the temperature of the mold is 100 ℃, and the pressure maintaining time is 3min, so as to obtain a soft magnetic powder core green body with a built-in cooling system;
(4) preparation of metallic soft magnetic powder core
Vacuum drying the soft magnetic powder core green blank to obtain a metal soft magnetic powder core with a built-in cooling mechanism; the density of the magnetic powder part of the metal soft magnetic powder core is 5.5-6.8 g/cm3；
Curing the soft magnetic powder core green blank in a vacuum drying oven at the curing temperature of 150 ℃ for 6 hours;
after solidification, obtaining a metal soft magnetic powder core with a built-in heat pipe cooling system; the density of the magnetic powder part of the metal soft magnetic powder core is 5.75-6.71g/cm3。
4. A method for preparing a soft magnetic powder core with a built-in cooling mechanism according to claim 3, characterized in that: in the step (1), the iron-based powder is more than one of ferrosilicon powder, ferrosilicon aluminum powder or carbonyl iron powder.
5. A method for preparing a soft magnetic powder core with a built-in cooling mechanism according to claim 3, characterized in that: in the step (4), the vacuum curing condition is as follows: the vacuum degree is-0.1 MPa, the curing temperature is 150 ℃, and the time is 6 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS57150495U (en) * | 1981-03-17 | 1982-09-21 | ||
| JPS6090794U (en) * | 1983-11-28 | 1985-06-21 | 高周波熱錬株式会社 | induction heating coil |
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