CN105655082B - Inductance, magnetic material composition and electronic component manufacturing method for inductance - Google Patents
Inductance, magnetic material composition and electronic component manufacturing method for inductance Download PDFInfo
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- CN105655082B CN105655082B CN201511029719.9A CN201511029719A CN105655082B CN 105655082 B CN105655082 B CN 105655082B CN 201511029719 A CN201511029719 A CN 201511029719A CN 105655082 B CN105655082 B CN 105655082B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/33—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials mixtures of metallic and non-metallic particles; metallic particles having oxide skin
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/23—Corrosion protection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
Abstract
The present invention provides a kind of inductance, magnetic material composition and electronic component manufacturing method for inductance.The inorganic ceramic powder of the magnetic metal powder of the magnetic material composition including 100 parts by weight for inductance and 0.05~1 parts by weight.The magnetic metal powder includes the iron of 94.5wt% or more, which includes aluminium oxide.Whereby, to play the effect for preventing the resin material of exterior resin portion from penetrating into magnetic material main body.
Description
Technical field
This disclosure relates to a kind of inductance, magnetic material composition and electronic component manufacturing method for inductance,
And in particular to it is a kind of with high rigidity and erosion-resisting inductance, for the magnetic material composition and electronic component system of inductance
Make method.
Background technique
Result of scaling trend based on current running gear, battery storage electricity also because the size of device reduce due to
Reduction, the charge requirement based on running gear, transformer and its inductance element are generally set in various electronic product.
In general, the production method of inductance element is generally that conducting wire is wrapped in magnetic body, then with exterior tree
Rouge coats and protects the conducting wire of winding.The composition of magnetic body consists essentially of iron and silicon, in addition can further add chromium (such as
The chromium of 10wt% or more) in the composition of magnetic body, chromium can form insulation oxide layer and (e.g. be formed together iron with iron
Chromium oxide layer) on particle surface in magnetic body, and can whole electrical performance to inductance element it is helpful.So
And the composition of magnetic body includes chromium and forms porous structure, therefore exterior resin can pass through the surface of magnetic body and seep
Enter in magnetic body, the depth of infiltration even can reach 30 microns (μm) of degree, therefore have for the hardness of magnetic body
Undesirable influence, and then the reliability and element characteristic of inductance element may be influenced.So industry is dedicated to development with good
The inductance element of good reliability and electromagnetic property.
Therefore, it is necessary to the new inductance of one kind, magnetic material composition and electronic component manufacturing method for inductance are designed,
To overcome drawbacks described above.
Summary of the invention
The purpose of the present invention is to provide a kind of inductance, for the magnetic material composition of inductance and electronic component manufacturer
Method, to prevent the resin material of exterior resin portion from penetrating into magnetic material main body.
In order to achieve the above objectives, the present invention provides a kind of magnetic material composition for inductance, comprising: 100 parts by weight
Magnetic metal powder, the magnetic metal powder include the iron of 94.5wt% or more；And 0.05~1 parts by weight inorganic ceramic powder
Body, which includes aluminium oxide.
Preferably, the magnetic metal powder further includes the silicon of 3~5.5wt%.
Preferably, the inorganic ceramic powder further includes the boron oxide (B of 10~20wt%2O3)。
Preferably, the inorganic ceramic powder further includes the phosphorous oxide (P of 10~20wt%2O5)。
Preferably, the inorganic ceramic powder further includes zinc oxide (ZnxO)。
Preferably, the average grain diameter of the inorganic ceramic powder is 2~12 microns (μm).
Preferably, the average grain diameter of the magnetic metal powder is greater than or equal to the average grain diameter of the inorganic ceramic powder.
Preferably, the average grain diameter of the magnetic metal powder is 2~5 times of the average grain diameter of the inorganic ceramic powder.
In order to achieve the above objectives, the present invention separately provides a kind of inductance, comprising: magnetic material main body, the magnetic material main body
Composition include: 100 parts by weight magnetic metal powder, which includes the iron of 94.5wt% or more；And 0.05
The inorganic ceramic powder of~1 parts by weight, which includes aluminium oxide；Conducting wire winds the magnetic material main body；And
Exterior resin portion covers the conducting wire.
Preferably, the magnetic metal powder further includes the silicon of 3~5.5wt%.
Preferably, the inorganic ceramic powder further includes the boron oxide (B of 10~20wt%2O3)。
Preferably, the inorganic ceramic powder further includes the phosphorous oxide (P of 10~20wt%2O5)。
Preferably, the average grain diameter of the inorganic ceramic powder is 2~12 microns.
Preferably, the average grain diameter of the magnetic metal powder is greater than or equal to the average grain diameter of the inorganic ceramic powder.
Preferably, the magnetic material main body includes magnetic core and inorganic ceramic superficial layer, the inorganic ceramic superficial layer
With outer ceramic surface.
Preferably, the magnetic core has annular recess and newel, which is arranged in the annular recess and winds
The newel, the inorganic ceramic superficial layer at least cover the inner surface of the annular recess and the side surface of the newel.
Preferably, the inorganic ceramic superficial layer with a thickness of 15~60 microns.
Preferably, the exterior resin portion has resin surface, stopped by the inorganic ceramic superficial layer, the outer ceramic surface
As the interface of the exterior resin portion and the magnetic material body contact, which is formed in the exterior resin
Between portion and the magnetic core, make the exterior resin portion that can not contact the magnetic core.
To reach above-mentioned purpose, the present invention also provides a kind of electronic component manufacturing method, include the following steps: to provide a magnetic
Property material composition, magnetic material composition includes: the magnetic metal powder of 100 parts by weight, which includes
The iron of 94.5wt% or more；And 0.05~1 parts by weight inorganic ceramic powder, which includes aluminium oxide；Sintering
The magnetic material is formed to make magnetic material main body, which includes: mainly by the magnetic metal powder institute structure
At magnetic core；And the inorganic ceramic superficial layer being mainly made of the inorganic ceramic powder, inorganic ceramic superficial layer tool
There is outer ceramic surface；By coating Wire-wound in the magnetic material main body；And it is set in being coated on the periphery for being coated conducting wire
For rouge material to constitute exterior resin portion, which covers the periphery of the coating conducting wire, which contacts the magnetic
Property body of material part of the surface, and by the inorganic ceramic superficial layer stop, the outer ceramic surface become the exterior resin portion
With the interface of the magnetic material body contact, the inorganic ceramic superficial layer be formed in the exterior resin portion and the magnetic core it
Between, make the exterior resin portion that can not contact the magnetic core.
Compared with prior art, the present invention is formed by inorganic ceramic superficial layer by inorganic ceramic powder and can effectively protect
Magnetic core is protected to reach erosion-resisting effect, and can further promote the integral hardness of magnetic material main body, Jin Erke
To achieve the effect that prevent the resin material of exterior resin portion from penetrating into magnetic material main body.
More preferably understand to have to above-mentioned and other aspect of the invention, preferred embodiment is cited below particularly, and cooperates institute
Accompanying drawings are described in detail below:
Detailed description of the invention
Fig. 1 is painted the three-dimensional view of the inductance of one embodiment of the invention.
Fig. 2 is painted the diagrammatic cross-section along hatching 2-2 ' shown in Fig. 1.
Specific embodiment
According to the embodiment of this disclosure, in the composition of the magnetic material main body of inductance, inorganic ceramic powder is formed
Inorganic ceramic superficial layer can be with effective protection magnetic core to reach erosion-resisting effect, and can further promote magnetism
The integral hardness of body of material, and then can achieve the effect for preventing the resin material of exterior resin portion from penetrating into magnetic material main body
Fruit.Identical label is to indicate same or like part in schema.It is noted that schema, which has simplified, clearly illustrates reality with benefit
The content of example is applied, the thin portion structure that embodiment is proposed is used by way of example only, not to the model to be protected of this disclosure
It encloses and limits.Tool usually intellectual works as and according to actual implementation aspect can need that those structures are modified or changed.
Fig. 1 is painted the three-dimensional view of the inductance 10 of one embodiment of the content of present invention, and Fig. 2 is painted along hatching 2- shown in Fig. 1
2 ' diagrammatic cross-section.As shown in FIG. 1 to FIG. 2, inductance 10 includes magnetic material main body 100, conducting wire 200 and exterior resin portion
300.The composition of magnetic material main body 100 includes the magnetic metal powder of 100 parts by weight and the inorganic pottery of 0.05~1 parts by weight
Porcelain powder, the magnetic metal powder include the iron of 94.5wt% or more, which includes aluminium oxide.Conducting wire volume 200
Around magnetic material main body 100, exterior resin portion 300 covers conducting wire 200.
As shown in Fig. 2, magnetic material main body 100 includes magnetic core 110 and inorganic ceramic superficial layer 120, inorganic pottery
Porcelain superficial layer 120 has outer ceramic surface 120a.In an embodiment, inorganic ceramic superficial layer 120 for example can coated magnetic core
The entire outer surface of body 110, and by magnetic core 110 and exterior resin portion 300 is completely isolated comes.
According to an embodiment of the invention, being formed by inorganic ceramic table by the inorganic ceramic powder of 0.05~1 parts by weight
Surface layer 120 can prevent subsequent electroplating process damage magnetic with effective protection magnetic core 110 to reach erosion-resisting effect
Core 110；Also, inorganic ceramic superficial layer 120 can further promote the integral hardness of magnetic material main body 100, Jin Erke
To achieve the effect that prevent the resin material of exterior resin portion 300 from penetrating into magnetic material main body 10.
According to an embodiment of the invention, inorganic ceramic material may if the content of inorganic ceramic powder is higher than 1 parts by weight
It is formed and is reunited in the surface of magnetic core 110 in processing procedure, thus sheet resistance and inductance value is caused to decline, for inductance 10
Electromagnetic property has undesirable influence.If the content of inorganic ceramic powder is lower than 0.05 parts by weight, can not be formed has packet enough
The inorganic ceramic superficial layer 120 for the property covered.
In another embodiment, which is, for example, mainly to be made of iron.Alternative, magnetic metal powder
It may also include the silicon of 3~5.5wt%；For example, which is, for example, and is made of iron and silicon.
In specific implementation, which may include the boron oxide (B of 10~20wt%2O3).For example, one
In embodiment, which e.g. includes the borosilicate glass of the boron oxide of 10~20wt%.
Alternative, which may include the phosphorous oxide (P of 10~20wt%2O5).For example, an embodiment
In, which e.g. includes the phosphosilicate glass of the phosphorous oxide of 10~20wt%.
In general, chromium (Cr) is added in the composition of the magnetic body of inductance often to reach erosion-resisting effect；Phase
Over the ground, according to an embodiment of the invention, the composition of magnetic material main body 10 does not include chromium, the composition of magnetic material main body 10 includes
The inorganic ceramic powder of 0.05~1 parts by weight, thus the hardness of magnetic material main body 10 can be greatly improved, and then can reach
To the effect of resin material infiltration magnetic material main body 10 that is anticorrosive and preventing exterior resin portion 300.In specific implementation,
The inorganic ceramic powder may include zinc oxide (ZnxO).The average grain diameter of the inorganic ceramic powder is, for example, 2~12 microns (μm).
The average grain diameter of the magnetic metal powder is, for example, to be greater than or equal to the average grain diameter of the inorganic ceramic powder.For example, in
One, the average grain diameter of the magnetic metal powder is, for example, 2~5 times of the average grain diameter of the inorganic ceramic powder.In this way, should
Inorganic ceramic powder can be filled in the gap between the magnetic metal powder of stacking, therefore can further provide for the magnetism
More preferably insulation effect between metal-powder, and will not because of the inorganic ceramic powder addition and reduce the magnetic metal powder
Stacking density, therefore be able to maintain that scheduled inductance value, and the structural strength of magnetic core 110 can be increased.
As shown in Fig. 2, magnetic core 110 has annular recess 110c and newel 110a, the setting of conducting wire 200 is cyclic annular recessed
In slot 110c and winding center column 110a, inorganic ceramic superficial layer 120 at least cover inner surface and the center of annular recess 110c
The side surface of column 110a.In specific implementation, the thickness T1 of inorganic ceramic superficial layer 120 is, for example, 15~60 microns.Such as Fig. 2 institute
Show, exterior resin portion 300 has resin surface 300b, by the blocking of inorganic ceramic superficial layer 120, inorganic ceramic superficial layer
120 outer ceramic surface 120a becomes the interface that exterior resin portion 300 is contacted with magnetic material main body 100, inorganic ceramic table
Surface layer 120 is formed between exterior resin portion 300 and magnetic core 110, makes exterior resin portion 300 that can not contact magnetic core
110。
As shown in Fig. 2, inductance 100 may also include terminal electrode 500A, 500B, terminal electrode 500A, 500B are respectively set
In slot 400A, 400B inside and be connected to terminal 200A, 200B of conducting wire 200, and terminal 200A, 200B of conducting wire 200 points
Terminal electrode 500A, 500B are not electrically connected to by scolding tin 600A, 600B.
The present invention also discloses a kind of embodiment of electronic component manufacturing method.Fig. 1, Fig. 2 are please referred to, firstly, providing magnetic
Material composition.This magnetic material composition includes the magnetic metal powder of 100 parts by weight and the inorganic ceramic of 0.05~1 parts by weight
Powder, the magnetic metal powder include the iron of 94.5wt% or more, which includes aluminium oxide.
Then, this magnetic material composition is sintered to make such as magnetic material main body 100 described previously herein.This magnetic material master
Body 100 includes the magnetic core 110 that is mainly made of magnetic metal powder above-mentioned and mainly by inorganic ceramic above-mentioned
The inorganic ceramic superficial layer 120 that powder is constituted, inorganic ceramic superficial layer 120 have outer ceramic surface 120a.In embodiment, burn
Junction temperature is, for example, the glass transition temperature (Tg) for being higher than inorganic ceramic powder.In an embodiment, sintering temperature is, for example, 700
DEG C~900 DEG C.
Specifically, after Overheating Treatment, since the sintering temperature of heat treatment is higher than inorganic ceramic powder (the ceramic material
Material) glass transition temperature (Tg), which, which knows from experience, is converted to liquid phase and flows to the surface of magnetic material main body 100
Region, and in formation inorganic ceramic superficial layer 120 on the surface of magnetic core 110.Inorganic ceramic superficial layer 120 can be protected effectively
Magnetic core 110 is protected to reach erosion-resisting effect.
Then, by a coating Wire-wound in magnetic material main body 100, this coating conducting wire is, for example, described previously herein leads
Line 200.
Then, in coating resin material on the periphery for being coated conducting wire to constitute such as exterior resin portion 300 described previously herein.
The resin material for example may include magnetic material.Exterior resin portion 300 covers the periphery of the coating conducting wire, and contacts magnetic material
The part of the surface of main body 100, and stopped by inorganic ceramic superficial layer 120, outer ceramic surface 120a becomes exterior resin portion 300
The interface contacted with magnetic material main body 100, inorganic ceramic superficial layer 120 are formed in exterior resin portion 300 and magnetic core
Between 110, make exterior resin portion 300 that can not contact magnetic core 110.So far, complete electronic component, the electronic component example
Inductance 10 as described herein in this way.
Embodiment is described further below.It is listed below the magnetic material group of the magnetic material main body of several embodiments
At and its characteristic test as a result, to illustrate the characteristic using inductance obtained by this disclosure.However embodiment below
It only illustrates and is used, and be not necessarily to be construed as the limitation of the scope of the present invention.The magnetic material composition of each embodiment is such as
Table 1, characteristic test result such as table 2.
Magnetic metal powder used by Examples 1 to 7 and comparative example 1 is iron silicon mixed powder, mainly by 95wt%
Iron and 5wt% silicon composition, D50 partial size be 10~20 microns.Inorganic ceramic powder FRA- used by Examples 1 to 4
119 be phosphosilicate glass, consisting of Al2O3-P2O5-R2O-F2, wherein R indicates impurity trace meter, and wherein P2O5Content
For 10~20wt%, the glass transition temperature (Tg) of inorganic ceramic powder FRA-119 is 351 DEG C, softening temperature (softening
It temperature) is 380 DEG C.Inorganic ceramic powder 4960F (S) used by embodiment 5~7 is borosilicate glass, composition
For SiO2-Al2O3-B2O3-R2O-BaO-ZnO, wherein R indicates impurity trace meter, and wherein B2O3Content be 10~
The glass transition temperature (Tg) of 20wt%, inorganic ceramic powder 4960F (S) are 464.5 DEG C, and softening temperature is 530 DEG C.Embodiment
1~7 and comparative example 1 in magnetic metal powder be 100 parts by weight.
Table 1
By in the magnetic material of Examples 1 to 7 listed by table 1 composition magnetic metal powder and inorganic ceramic powder mix
After uniformly obtaining magnetic material composition powder, it will be formed as shown in Fig. 1~2 after the molding of magnetic material composition powder, cutting
Magnetic material main body 100 jeans button shape, and comparative example 1 be then by the magnetic metal powder molding, cutting after formed such as
The jeans button shape of magnetic material main body 100 shown in Fig. 1~2.Then, to the molding material of Examples 1 to 7 and comparative example 1
The magnetic material main body 100 of Examples 1 to 7 and the magnetic material master of comparative example 1 is made after being sintered with 850 DEG C in material main body
Body.Then, after conducting wire 200 being wound in magnetic material main body, electrical measurement as listed in table 2 is carried out.Examples 1 to 7 and
The magnetic material main body of jeans button shape made of comparative example 1 have length about 2.0 ± 0.2 millimeters of (mm), width about 1.6 ±
0.2 millimeter and about 1.0 millimeters of maximum height, it is about 0.06 that conducting wire 200 used by Examples 1 to 7 and comparative example 1, which has line footpath,
Millimeter and the winding circle of magnetic material main body 26.5.
Table 2
2 (Continued) of table
Listed size is the magnetic material main body of jeans button shape made of Examples 1 to 7 and comparative example 1 in table 2
Length, width and height.Before listed resistance to electric current (%) refers to the inductance value after applying electric current compared to application electric current in table 2
Inductance value decline ratio.Specifically, the inductance value after application electric current is L0, and the inductance value before applying electric current is
L1, then resistance to electric current is equal to (L1-L0)/L0.Listed pressure resistance indicates around the magnetic material main body of jeans button shape in table 2
Partially application pressure when (the namely top of annular recess 110c) downward pressure to magnetic material body breaks.
As shown in table 2, the magnetic material main body of Examples 1 to 7 compared to the magnetic material main body of comparative example 1 all have compared with
Big size, this is because inorganic ceramic powder be precipitated to form inorganic ceramic superficial layer 120 on the surface of magnetic core 110 and
It causes.
As shown in table 2, compared to comparative example 1, the composition of the magnetic material main body of Examples 1 to 7 includes 0.05~1 weight
Measure the inorganic ceramic powder of part, therefore the preferably resistance to electric current performance (inductance value down ratio is lower) of tool and higher surface
Resistance, and compressive resistance similar in the magnetic material main body with comparative example 1 can also be kept.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only to implement example of the invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from spirit of the invention and
It is changed and retouched made by range, belongs to scope of patent protection of the invention.
Claims (17)
1. a kind of magnetic material for inductance forms, which has magnetic material main body, conducting wire and exterior resin portion, this is led
The coil of wire covers the conducting wire around the magnetic material main body, the exterior resin portion, which is characterized in that the magnetic material, which forms, includes:
The magnetic metal powder of 100 parts by weight, the magnetic metal powder include the iron of 94.5wt% or more, the magnetic metal powder
Constitute magnetic core；And
The inorganic ceramic powder of 0.05~1 parts by weight, which includes aluminium oxide, which constitutes nothing
Machine ceramic blankets, the inorganic ceramic superficial layer at least cover the part of the surface of the magnetic core, to prevent the exterior resin portion
Resin material penetrate into the magnetic material main body；
Wherein, the average grain diameter of the magnetic metal powder is greater than or equal to the average grain diameter of the inorganic ceramic powder.
2. magnetic material composition as described in claim 1, which is characterized in that the magnetic metal powder further includes 3~5.5wt%
Silicon.
3. magnetic material composition as described in claim 1, which is characterized in that the inorganic ceramic powder further includes 10~20wt%
Boron oxide.
4. magnetic material composition as described in claim 1, which is characterized in that the inorganic ceramic powder further includes 10~20wt%
Phosphorous oxide.
5. magnetic material composition as described in claim 1, which is characterized in that the inorganic ceramic powder further includes zinc oxide.
6. magnetic material as described in claim 1 composition, which is characterized in that the average grain diameter of the inorganic ceramic powder is 2~
12 microns.
7. magnetic material composition as described in claim 1, which is characterized in that the average grain diameter of the magnetic metal powder is the nothing
2~5 times of the average grain diameter of machine ceramic powder.
8. a kind of inductance characterized by comprising
The composition of magnetic material main body, the magnetic material main body includes:
The magnetic metal powder of 100 parts by weight, the magnetic metal powder include the iron of 94.5wt% or more, the magnetic metal powder
Constitute magnetic core；And
The inorganic ceramic powder of 0.05~1 parts by weight, which includes aluminium oxide, which constitutes nothing
Machine ceramic blankets, the inorganic ceramic superficial layer at least cover the part of the surface of the magnetic core；
Conducting wire winds the magnetic material main body；And
Exterior resin portion covers the conducting wire；
Wherein, the average grain diameter of the magnetic metal powder is greater than or equal to the average grain diameter of the inorganic ceramic powder, to prevent this
The resin material of exterior resin portion penetrates into the magnetic material main body.
9. inductance as claimed in claim 8, which is characterized in that the magnetic metal powder further includes the silicon of 3~5.5wt%.
10. inductance as claimed in claim 8, which is characterized in that the inorganic ceramic powder further includes the oxidation of 10~20wt%
Boron.
11. inductance as claimed in claim 8, which is characterized in that the inorganic ceramic powder further includes the oxidation of 10~20wt%
Phosphorus.
12. inductance as claimed in claim 8, which is characterized in that the average grain diameter of the inorganic ceramic powder is 2~12 microns.
13. inductance as claimed in claim 8, which is characterized in that the magnetic material main body includes magnetic core and inorganic pottery
Porcelain superficial layer, the inorganic ceramic superficial layer have outer ceramic surface.
14. inductance as claimed in claim 13, which is characterized in that the magnetic core has annular recess and newel, this is led
Line is arranged in the annular recess and winds the newel, which at least covers the inner surface of the annular recess
With the side surface of the newel.
15. inductance as claimed in claim 13, which is characterized in that the inorganic ceramic superficial layer with a thickness of 15~60 microns.
16. inductance as claimed in claim 13, which is characterized in that the exterior resin portion has resin surface, inorganic by this
Ceramic blankets stop, which becomes the interface of the exterior resin portion and the magnetic material body contact, the nothing
Machine ceramic blankets are formed between the exterior resin portion and the magnetic core, make the exterior resin portion that can not contact the magnetic core
Body.
17. a kind of electronic component manufacturing method, which comprises the steps of:
Magnetic material composition is provided, magnetic material composition includes:
The magnetic metal powder of 100 parts by weight, the magnetic metal powder include the iron of 94.5wt% or more；And
The inorganic ceramic powder of 0.05~1 parts by weight, which includes aluminium oxide, wherein the magnetic metal powder
Average grain diameter is greater than or equal to the average grain diameter of the inorganic ceramic powder；
Magnetic material composition is sintered to make magnetic material main body, which includes:
The magnetic core being mainly made of the magnetic metal powder；And
The inorganic ceramic superficial layer being mainly made of the inorganic ceramic powder, the inorganic ceramic superficial layer have ceramic appearance
Face；
By coating Wire-wound in the magnetic material main body；And
In being coated with resin material on the periphery for being coated conducting wire to constitute exterior resin portion, which covers this and coating leads
The periphery of line, which contacts the part of the surface of the magnetic material main body, and is stopped by the inorganic ceramic superficial layer,
The outer ceramic surface becomes the interface of the exterior resin portion and the magnetic material body contact, which forms
Between the exterior resin portion and the magnetic core, make the exterior resin portion that can not contact the magnetic core.
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| CN105185560A (en) * | 2015-08-24 | 2015-12-23 | 北京康普锡威科技有限公司 | Preparation method of Fe-based metal soft magnetic powder core |
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