CN105655082A - Inductor, magnetic material composition for inductor and electronic component manufacturing method - Google Patents
Inductor, magnetic material composition for inductor and electronic component manufacturing method Download PDFInfo
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- CN105655082A CN105655082A CN201511029719.9A CN201511029719A CN105655082A CN 105655082 A CN105655082 A CN 105655082A CN 201511029719 A CN201511029719 A CN 201511029719A CN 105655082 A CN105655082 A CN 105655082A
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- inorganic ceramic
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- inductance
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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
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- 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
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- 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
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- 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 invention provides an inductor, a magnetic material composition for the inductor and an electronic component manufacturing method. The magnetic material composition for the inductor is prepared from, by weight, 100 parts of magnetic metal powder and 0.05-1 part of inorganic ceramic powder. The magnetic metal powder comprises iron with the amount being 94.5% or above. The inorganic ceramic powder comprises aluminum oxide. Accordingly, the effect of preventing a resin material of an externally-arranged resin part from seeping into a magnetic material body can be achieved.
Description
Technical field
This disclosure relates to a kind of inductance, magnetic material for inductance forms and electronic component manufacture method, and in particular to a kind of there is high rigidity and erosion-resisting inductance, magnetic material for inductance forms and electronic component manufacture method.
Background technology
Based on the result of scaling trend of current running gear, battery storage electricity also reduces therewith because the size of device reduces, and is generally arranged in various electronic product based on the charge requirement of running gear, transformator and inductance element thereof.
It is said that in general, the production method of inductance element is generally be wrapped in magnetic body by wire, then with exterior resin-coating the wire protecting winding. The composition of magnetic body consists essentially of ferrum and silicon, even can add chromium (chromium of such as more than 10wt%) further in the composition of magnetic body, chromium can be formed on the insulation oxide layer (being such as collectively form iron chromium oxide layer with ferrum) particle surface in magnetic body, and can be helpful to the overall electrical performance of inductance element. But, the composition of magnetic body includes chromium and forms porous structure, therefore exterior resin can pass the surface of magnetic body and penetrate in magnetic body, the degree of depth penetrated into even can arrive the degree of 30 microns (��m), therefore there is bad impact for the hardness of magnetic body, and then be likely to affect the reliability of inductance element and element characteristic. So industry is all devoted to develop the inductance element with good reliability and electromagnetic property.
Therefore, it is necessary to design a kind of new inductance, for inductance magnetic material form and electronic component manufacture method, to overcome drawbacks described above.
Summary of the invention
It is an object of the invention to provide a kind of inductance, the magnetic material for inductance forms and electronic component manufacture method, to prevent the resin material of exterior resin portion from penetrating into magnetic material main body.
For reaching above-mentioned purpose, the present invention provides a kind of magnetic material for inductance to form, including: the magnetic metal powder body of 100 weight portions, this magnetic metal powder body includes the ferrum of more than 94.5wt%; And 0.05��1 inorganic ceramic powder body of weight portion, this inorganic ceramic powder body includes aluminium oxide.
It is also preferred that the left this magnetic metal powder body also includes the silicon of 3��5.5wt%.
It is also preferred that the left this inorganic ceramic powder body also includes the boron oxide (B of 10��20wt%2O3)��
It is also preferred that the left this inorganic ceramic powder body also includes the phosphorous oxide (P of 10��20wt%2O5)��
It is also preferred that the left this inorganic ceramic powder body also includes zinc oxide (ZnxO)��
It is also preferred that the left the mean diameter of this inorganic ceramic powder body is 2��12 microns (��m).
It is also preferred that the left the mean diameter of this magnetic metal powder body is more than or equal to the mean diameter of this inorganic ceramic powder body.
It is also preferred that the left 2��5 times of the mean diameter that the mean diameter of this magnetic metal powder body is this inorganic ceramic powder body.
For reaching above-mentioned purpose, the present invention separately provides a kind of inductance, including: magnetic material main body, the composition of this magnetic material main body includes: the magnetic metal powder body of 100 weight portions, and this magnetic metal powder body includes the ferrum of more than 94.5wt%; And 0.05��1 inorganic ceramic powder body of weight portion, this inorganic ceramic powder body includes aluminium oxide; Wire, winds this magnetic material main body; And exterior resin portion, cover this wire.
It is also preferred that the left this magnetic metal powder body also includes the silicon of 3��5.5wt%.
It is also preferred that the left this inorganic ceramic powder body also includes the boron oxide (B of 10��20wt%2O3)��
It is also preferred that the left this inorganic ceramic powder body also includes the phosphorous oxide (P of 10��20wt%2O5)��
It is also preferred that the left the mean diameter of this inorganic ceramic powder body is 2��12 microns.
It is also preferred that the left the mean diameter of this magnetic metal powder body is more than or equal to the mean diameter of this inorganic ceramic powder body.
It is also preferred that the left this magnetic material main body includes magnetic core and inorganic ceramic surface layer, this inorganic ceramic surface layer has outer ceramic surface.
It is also preferred that the left this magnetic core has annular recess and newel, this wire is arranged in this annular recess and winds this newel, and this inorganic ceramic surface layer at least covers the inner surface of this annular recess and the side surface of this newel.
It is also preferred that the left the thickness of this inorganic ceramic surface layer is 15��60 microns.
Preferably, this exterior resin portion has resin surface, it is subject to this inorganic ceramic surface layer to stop, this outer ceramic surface becomes the interface of this exterior resin portion and this magnetic material body contact, this inorganic ceramic surface layer is formed between this exterior resin portion and this magnetic core, makes this exterior resin portion cannot contact this magnetic core.
For arriving above-mentioned purpose, the present invention also provides for a kind of electronic component manufacture method, comprising the steps: to provide a magnetic material composition, this magnetic material composition includes: the magnetic metal powder body of 100 weight portions, and this magnetic metal powder body includes the ferrum of more than 94.5wt%; And 0.05��1 inorganic ceramic powder body of weight portion, this inorganic ceramic powder body includes aluminium oxide; Sintering this magnetic material to form to make magnetic material main body, this magnetic material main body includes: the magnetic core being mainly made up of this magnetic metal powder body; And the inorganic ceramic surface layer being mainly made up of this inorganic ceramic powder body, this inorganic ceramic surface layer has outer ceramic surface; By coating Wire-wound in this magnetic material main body; And on the periphery of this coating wire coating resin material to constitute exterior resin portion, this exterior resin portion covers the periphery of this coating wire, this exterior resin portion contacts the part surface of this magnetic material main body, and it is subject to the stop of this inorganic ceramic surface layer, this outer ceramic surface becomes the interface of this exterior resin portion and this magnetic material body contact, this inorganic ceramic surface layer is formed between this exterior resin portion and this magnetic core, makes this exterior resin portion cannot contact this magnetic core.
Compared with prior art; the inorganic ceramic surface layer that the present invention is formed by inorganic ceramic powder body can effectively protect magnetic core to reach erosion-resisting effect; and the integral hardness of magnetic material main body can be promoted further, and then the effect preventing the resin material of exterior resin portion from penetrating into magnetic material main body can be reached.
In order to the above-mentioned and other aspect of the present invention being had understanding more preferably, preferred embodiment cited below particularly, and coordinating institute's accompanying drawings, being described in detail below:
Accompanying drawing explanation
Fig. 1 illustrates the three-dimensional view of the inductance of one embodiment of the invention.
Fig. 2 illustrates the generalized section along hatching 2-2 ' shown in Fig. 1.
Detailed description of the invention
Embodiment according to this disclosure; in the composition of the magnetic material main body of inductance; the inorganic ceramic surface layer that inorganic ceramic powder body is formed can effectively protect magnetic core to reach erosion-resisting effect; and the integral hardness of magnetic material main body can be promoted further, and then the effect preventing the resin material of exterior resin portion from penetrating into magnetic material main body can be reached. Label identical in graphic is in order to indicate same or like part. Having simplified in order to the content knowing explanation embodiment it is noted that graphic, the proposed thin portion structure of embodiment use by way of example only, the scope that this disclosure is not intended to protection does limit. Tool usually intellectual when can according to reality implement aspect need those structures are modified or are changed.
Fig. 1 illustrates the three-dimensional view of the inductance 10 of present invention one embodiment, and Fig. 2 illustrates the generalized section along hatching 2-2 ' shown in Fig. 1. As shown in Fig. 1��Fig. 2, inductance 10 includes magnetic material main body 100, wire 200 and exterior resin portion 300. The composition of magnetic material main body 100 includes the magnetic metal powder body of 100 weight portions and the inorganic ceramic powder body of 0.05��1 weight portion, and this magnetic metal powder body includes the ferrum of more than 94.5wt%, and this inorganic ceramic powder body includes aluminium oxide. Wire 200 winds magnetic material main body 100, and exterior resin portion 300 covers wire 200.
As in figure 2 it is shown, magnetic material main body 100 includes magnetic core 110 and inorganic ceramic surface layer 120, inorganic ceramic surface layer 120 has outer ceramic surface 120a. In an embodiment, inorganic ceramic surface layer 120 such as can the whole outer surface of coated magnetic core body 110, and by magnetic core 110 with exterior resin portion 300 is completely isolated comes.
According to embodiments of the invention, this inorganic ceramic powder body of 0.05��1 weight portion the inorganic ceramic surface layer 120 formed can effectively protect magnetic core 110 to reach erosion-resisting effect, can prevent follow-up electroplating process damage magnetic core 110; Further, inorganic ceramic surface layer 120 can promote the integral hardness of magnetic material main body 100 further, and then can reach the effect preventing the resin material of exterior resin portion 300 from penetrating into magnetic material main body 10.
According to embodiments of the invention, if the content of inorganic ceramic powder body is higher than 1 weight portion, inorganic ceramic material may be formed in the middle of processing procedure reunites in the surface of magnetic core 110, thus results in sheet resistance and inductance value declines, and the electromagnetic property for inductance 10 has bad impact. If the content of inorganic ceramic powder body is lower than 0.05 weight portion, then cannot form the inorganic ceramic surface layer 120 with enough covering properties.
In another embodiment, this magnetic metal powder body is mainly made up of ferrum. Alternative, magnetic metal powder body may also include the silicon of 3��5.5wt%; For example, this magnetic metal powder body is such as made up of ferrum and silicon.
In being embodied as, this inorganic ceramic powder body can include the boron oxide (B of 10��20wt%2O3). For example, in an embodiment, this inorganic ceramic powder style comprises the borosilicate glass of the boron oxide of 10��20wt% in this way.
Alternative, this inorganic ceramic powder body can include the phosphorous oxide (P of 10��20wt%2O5). For example, in an embodiment, this inorganic ceramic powder style comprises the phosphosilicate glass of the phosphorous oxide of 10��20wt% in this way.
In general, in the composition of the magnetic body of inductance of being everlasting, chromium (Cr) is added to reach erosion-resisting effect; Relatively, according to embodiments of the invention, the composition of magnetic material main body 10 does not include chromium, the composition of magnetic material main body 10 includes this inorganic ceramic powder body of 0.05��1 weight portion, thus the hardness of magnetic material main body 10 can be greatly improved, and then resin material that is anticorrosive and that prevent exterior resin portion 300 can be reached penetrate into the effect of magnetic material main body 10. In being embodied as, this inorganic ceramic powder body can include zinc oxide (ZnxO). The mean diameter of this inorganic ceramic powder body is such as 2��12 microns (��m). The mean diameter of this magnetic metal powder body is such as greater than or equal to the mean diameter of this inorganic ceramic powder body. For example, Yu Yi, the mean diameter of this magnetic metal powder body is such as 2��5 times of the mean diameter of this inorganic ceramic powder body. Thus, this inorganic ceramic powder body can be filled in the gap between this stacking magnetic metal powder body, therefore insulation effect more preferably between this magnetic metal powder body can be further provided for, and the stacking density of this magnetic metal powder body will not be reduced because of the interpolation of this inorganic ceramic powder body, therefore, it is possible to maintain predetermined inductance value, and the structural strength of magnetic core 110 can be increased.
As shown in Figure 2, magnetic core 110 has annular recess 110c and newel 110a, wire 200 is arranged in annular recess 110c and winding center post 110a, and inorganic ceramic surface layer 120 at least covers the inner surface of annular recess 110c and the side surface of newel 110a. In being embodied as, the thickness T1 of inorganic ceramic surface layer 120 is such as 15��60 microns. As shown in Figure 2, exterior resin portion 300 has resin surface 300b, it is subject to the stop of inorganic ceramic surface layer 120, the outer ceramic surface 120a of inorganic ceramic surface layer 120 becomes the interface that exterior resin portion 300 contacts with magnetic material main body 100, inorganic ceramic surface layer 120 is formed between exterior resin portion 300 and magnetic core 110, makes exterior resin portion 300 cannot contact magnetic core 110.
As shown in Figure 2, inductance 100 may also include terminal electrode 500A, 500B, terminal electrode 500A, 500B are respectively arranged at the inside of groove 400A, 400B and are connected to terminal 200A, 200B of wire 200, and terminal 200A, 200B of wire 200 are electrically connected to terminal electrode 500A, 500B by scolding tin 600A, 600B respectively.
The present invention also discloses the embodiment of a kind of electronic component manufacture method. Refer to Fig. 1, Fig. 2, first, it is provided that magnetic material forms. This magnetic material composition includes the magnetic metal powder body of 100 weight portions and the inorganic ceramic powder body of 0.05��1 weight portion, and this magnetic metal powder body includes the ferrum of more than 94.5wt%, and this inorganic ceramic powder body 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 main body 100 includes the magnetic core 110 being mainly made up of and the inorganic ceramic surface layer 120 being mainly made up of aforesaid inorganic ceramic powder body aforesaid magnetic metal powder body, and inorganic ceramic surface layer 120 has outer ceramic surface 120a.In embodiment, sintering temperature is such as above the glass transition temperature (Tg) of inorganic ceramic powder body. In an embodiment, sintering temperature is such as 700 DEG C��900 DEG C.
Specifically, after Overheating Treatment, owing to heat treated sintering temperature is higher than the glass transition temperature (Tg) of this inorganic ceramic powder body (ceramic material), this inorganic ceramic powder knows from experience the region, surface being converted to liquid phase and flow to magnetic material main body 100, and forms inorganic ceramic surface layer 120 on the surface of magnetic core 110. Inorganic ceramic surface layer 120 can effectively protect magnetic core 110 to reach erosion-resisting effect.
Then, by a coating Wire-wound in magnetic material main body 100, this coating wire is such as wire 200 described previously herein.
Then, on the periphery of this coating wire coating resin material to constitute such as exterior resin portion 300 described previously herein. This resin material such as can include magnetic material. Exterior resin portion 300 covers the periphery of this coating wire, and the part surface of contact magnetic material main body 100, and be subject to inorganic ceramic surface layer 120 and stop, outer ceramic surface 120a becomes the interface that exterior resin portion 300 contacts with magnetic material main body 100, inorganic ceramic surface layer 120 is formed between exterior resin portion 300 and magnetic core 110, makes exterior resin portion 300 cannot contact magnetic core 110. So far, complete electronic component, and this electronic component is such as inductance 10 as described herein.
Hereinafter embodiment is described further. It is listed below magnetic material composition and its characteristic test result of the magnetic material main body of several embodiment, to illustrate to apply the characteristic of the inductance obtained by this disclosure. But below example is only the use illustrated, and it is not necessarily to be construed as the restriction of scope. The magnetic material of each embodiment forms such as table 1, characteristic test result such as table 2.
The magnetic metal powder body that embodiment 1��7 and comparative example 1 adopt is ferrum silicon mixed powder, is mainly made up of the ferrum of 95wt% and the silicon of 5wt%, and its D50 particle diameter is 10��20 microns. The inorganic ceramic powder body FRA-119 that embodiment 1��4 adopts is phosphosilicate glass, and it consists of Al2O3-P2O5-R2O-F2, wherein R represents impurity trace meter, and wherein P2O5Content be 10��20wt%, the glass transition temperature (Tg) of inorganic ceramic powder body FRA-119 is 351 DEG C, and softening temperature (softeningtemperature) is 380 DEG C. Inorganic ceramic powder body 4960F (S) that embodiment 5��7 adopts is borosilicate glass, and it consists of SiO2-Al2O3-B2O3-R2O-BaO-ZnO, wherein R represents impurity trace meter, and wherein B2O3Content be 10��20wt%, the glass transition temperature (Tg) of inorganic ceramic powder body 4960F (S) is 464.5 DEG C, and softening temperature is 530 DEG C. Magnetic metal powder body in embodiment 1��7 and comparative example 1 is 100 weight portions.
Table 1
After magnetic metal powder body in the magnetic material of the embodiment 1��7 listed by table 1 composition and inorganic ceramic powder body mix homogeneously are obtained magnetic material composition powder body, forming the jeans button shape of magnetic material main body 100 as shown in Fig. 1��2 after this magnetic material forms powder body molding, cutting, comparative example 1 is then by the jeans button shape of the magnetic material main body 100 formed after this magnetic metal powder body molding, cutting as shown in Fig. 1��2. Then, the magnetic material main body 100 of embodiment 1��7 and the magnetic material main body of comparative example 1 are prepared with 850 DEG C after the body of material of embodiment 1��7 and the molding of comparative example 1 being sintered.Then, after being wound in magnetic material main body by wire 200, electrical measurement as listed in table 2 is carried out. The magnetic material main body of the jeans button shape that embodiment 1��7 and comparative example 1 are made has length about 2.0 �� 0.2 millimeters of (mm), width about 1.6 �� 0.2 millimeters and maximum height about 1.0 millimeters, the wire 200 that embodiment 1��7 and comparative example 1 adopt have wire diameter be about 0.06 millimeter and winding magnetic material main body 26.5 enclose.
Table 2
Table 2 (Continued)
Listed in table 2 it is of a size of embodiment 1��7 and the length of magnetic material main body of jeans button shape, width and height that comparative example 1 is made. Resistance to electric current (%) listed in table 2 refers to apply the ratio that the inductance value after electric current declines compared to the inductance value applied before electric current. Specifically, applying the inductance value after electric current is L0, and applying the inductance value before electric current is L1, then resistance to electric current is equal to (L1-L0)/L0. Applying pressure when pressure expression listed in table 2 is from the downward pressure of peripheral part (namely the top of annular recess 110c) of the magnetic material main body of jeans button shape to magnetic material body breaks.
As shown in table 2, the magnetic material main body of embodiment 1��7 is respectively provided with bigger size compared to the magnetic material main body of comparative example 1, and this is to cause on the surface of magnetic core 110 owing to inorganic ceramic powder body precipitates out formation inorganic ceramic surface layer 120.
As shown in table 2, compared to comparative example 1, the composition of the magnetic material main body of embodiment 1��7 all includes the inorganic ceramic powder body of 0.05��1 weight portion, therefore all have the preferably performance of resistance to electric current (inductance value down ratio is relatively low) and higher sheet resistance, and also the compressive resistance close with the magnetic material main body of comparative example 1 can be kept.
The present invention is been described by by above-mentioned related embodiment, but above-described embodiment is only the example implementing the present invention. It must be noted that, the embodiment disclosed is not limiting as the scope of the present invention. On the contrary, the change made without departing from the spirit and scope of the present invention and retouching, all belong to the scope of patent protection of the present invention.
Claims (19)
1. the magnetic material for inductance forms, it is characterised in that including:
The magnetic metal powder body of 100 weight portions, this magnetic metal powder body includes the ferrum of more than 94.5wt%; And
The inorganic ceramic powder body of 0.05��1 weight portion, this inorganic ceramic powder body includes aluminium oxide.
2. magnetic material composition as claimed in claim 1, it is characterised in that this magnetic metal powder body also includes the silicon of 3��5.5wt%.
3. magnetic material composition as claimed in claim 1, it is characterised in that this inorganic ceramic powder body also includes the boron oxide of 10��20wt%.
4. magnetic material composition as claimed in claim 1, it is characterised in that this inorganic ceramic powder body also includes the phosphorous oxide of 10��20wt%.
5. magnetic material composition as claimed in claim 1, it is characterised in that this inorganic ceramic powder body also includes zinc oxide.
6. magnetic material composition as claimed in claim 1, it is characterised in that the mean diameter of this inorganic ceramic powder body is 2��12 microns.
7. magnetic material composition as claimed in claim 1, it is characterised in that the mean diameter of this magnetic metal powder body is more than or equal to the mean diameter of this inorganic ceramic powder body.
8. magnetic material composition as claimed in claim 7, it is characterised in that the mean diameter of this magnetic metal powder body is 2��5 times of the mean diameter of this inorganic ceramic powder body.
9. an inductance, it is characterised in that including:
Magnetic material main body, the composition of this magnetic material main body includes:
The magnetic metal powder body of 100 weight portions, this magnetic metal powder body includes the ferrum of more than 94.5wt%; And
The inorganic ceramic powder body of 0.05��1 weight portion, this inorganic ceramic powder body includes aluminium oxide;
Wire, winds this magnetic material main body; And
Exterior resin portion, covers this wire.
10. inductance as claimed in claim 9, it is characterised in that this magnetic metal powder body also includes the silicon of 3��5.5wt%.
11. inductance as claimed in claim 9, it is characterised in that this inorganic ceramic powder body also includes the boron oxide of 10��20wt%.
12. inductance as claimed in claim 9, it is characterised in that this inorganic ceramic powder body also includes the phosphorous oxide of 10��20wt%.
13. inductance as claimed in claim 9, it is characterised in that the mean diameter of this inorganic ceramic powder body is 2��12 microns.
14. inductance as claimed in claim 9, it is characterised in that the mean diameter of this magnetic metal powder body is more than or equal to the mean diameter of this inorganic ceramic powder body.
15. inductance as claimed in claim 9, it is characterised in that this magnetic material main body includes magnetic core and inorganic ceramic surface layer, and this inorganic ceramic surface layer has outer ceramic surface.
16. inductance as claimed in claim 15, it is characterized in that, this magnetic core has annular recess and newel, and this wire is arranged in this annular recess and winds this newel, and this inorganic ceramic surface layer at least covers the inner surface of this annular recess and the side surface of this newel.
17. inductance as claimed in claim 15, it is characterised in that the thickness of this inorganic ceramic surface layer is 15��60 microns.
18. inductance as claimed in claim 15, it is characterized in that, this exterior resin portion has resin surface, it is subject to this inorganic ceramic surface layer to stop, this outer ceramic surface becomes the interface of this exterior resin portion and this magnetic material body contact, this inorganic ceramic surface layer is formed between this exterior resin portion and this magnetic core, makes this exterior resin portion cannot contact this magnetic core.
19. an electronic component manufacture method, it is characterised in that comprise the steps:
Thering is provided a magnetic material composition, this magnetic material composition includes:
The magnetic metal powder body of 100 weight portions, this magnetic metal powder body includes the ferrum of more than 94.5wt%; And
The inorganic ceramic powder body of 0.05��1 weight portion, this inorganic ceramic powder body includes aluminium oxide;
Sintering this magnetic material to form to make magnetic material main body, this magnetic material main body includes:
The main magnetic core being made up of this magnetic metal powder body; And
The main inorganic ceramic surface layer being made up of this inorganic ceramic powder body, this inorganic ceramic surface layer has outer ceramic surface;
By coating Wire-wound in this magnetic material main body; And
On the periphery of this coating wire, coating resin material is to constitute exterior resin portion, this exterior resin portion covers the periphery of this coating wire, this exterior resin portion contacts the part surface of this magnetic material main body, and it is subject to the stop of this inorganic ceramic surface layer, this outer ceramic surface becomes the interface of this exterior resin portion and this magnetic material body contact, this inorganic ceramic surface layer is formed between this exterior resin portion and this magnetic core, makes this exterior resin portion cannot contact this magnetic core.
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