CN102314995A - Electronic component - Google Patents
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- CN102314995A CN102314995A CN2011101217943A CN201110121794A CN102314995A CN 102314995 A CN102314995 A CN 102314995A CN 2011101217943 A CN2011101217943 A CN 2011101217943A CN 201110121794 A CN201110121794 A CN 201110121794A CN 102314995 A CN102314995 A CN 102314995A
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Abstract
The present invention provides and can form terminal electrode film accurately on the glass-film surface, and the high electronic component of the adhesive strength of terminal electrode film and glass-film.Electronic component of the present invention has at least a portion of element body (2), lining element body (2), the glass-film (10) of whole outer surfaces that preferably are covered and the electrode film (32) that is formed at glass-film (10) surface; The ceramic particle that datum length is 0.5～20 micron (40) is surperficial with every 0.01mm at glass-film (10)
2The ratio of 10～5000 of unit ares distribute and expose.
Description
Technical area
The present invention relates to electronic components such as coil component, in more detail, relate to the electronic component that forms with the excellent glass-film of the adhesive property of terminal electrode.
Background technology
Along with miniaturization, in order to obtain needed characteristic, from using the Ni-Zn core to using the Mn-Zn core all to study as the routine coil component of one of electronic component.But Mn-Zn core insulation property is low, therefore can not directly on the surface of core, electrode be set, so the situation (patent documentation 1) that glass-film is set on the surface of core is arranged.On the surface of glass-film, form terminal electrode, on this terminal electrode, connect the for example end of the lead-in wire of coil component.
But, in existing technology, exist to be not easy high accuracy formation terminal electrode film on the glass-film surface, and the problem of the adhesive strength difference of terminal electrode film.
Again; Even electronic components such as dielectric ferrite core, piezo-resistance; In order to improve the performance and the insulation property of its tenable environment influence, sometimes also want to form glass-film in its surface as diaphragm, form electroconductive members such as terminal electrode in its surface.
The prior art document
Patent documentation 1: TOHKEMY 2001-237135 communique
Summary of the invention
The present invention makes in view of such actual conditions, and its purpose is, and provide and can on the surface of glass-film, high accuracy form terminal electrode film, and the high electronic component of the adhesive strength of terminal electrode film and glass-film.
To achieve these goals, electronic component of the present invention has at least a portion of element body, the said element body of lining, the electrode film that preferably covers the glass-film of whole outer surfaces and be formed at said glass-film surface, it is characterized in that,
The ceramic particle that datum length is 0.5～20 micron on said glass-film surface with every 0.01mm
2The ratio of 10～5000 of unit ares distribute and expose.Also have, the datum length of so-called particle means diameter under the situation of particle for sphere, if other shapes then mean full-size.
In the electronic component of the present invention, on the surface of glass-film, the distributing ceramic particle of stipulated standard length of the proportion of particles of defined amount is arranged with per unit area.Therefore, when on the surface of this glass-film, utilizing for example electrode paste printing process to form the electrode film of predetermined pattern, can form electrode film accurately in impermeable ground.And can improve the adhesive strength between glass-film and the electrode film.These effects be considered to since the ceramic particle that exposes on the surface of glass-film and electrode film between play the infiltrating effect of adjustment electrode paste film, ceramic particle plays fixation after vitrifying simultaneously.
Again; Ratio with the per unit area defined amount distributes electronic component of the present invention because the ceramic particle of stipulated standard length is on the glass-film surface; In the manufacture process of electronic component, the element body that can seek to prevent to form glass-film adhere each other or with burn till instrument adhesion causing distortion, breakage.And can improve the resistance to wear on electronic component surface (glass-film surface), and also can improve intensity simultaneously, prevent the generation of crackle, defective etc.And, simultaneously ion is moved and be not easy to take place because ceramic particle in the glass-film surface distributed and expose, can improve insulating properties.
Preferably perpendicular to observing under the situation of said glass-film with at least one cross section at the interface of said element body par; Said glass-film have with surface contact the 1st layer with the 2nd layer that contacts with said interface; Compare said the 1st layer of more said ceramic particle that distributing with said the 2nd layer.Through adopting such structure, glass-film can seek to improve the close property with element body, and can seek to improve the adhesive strength of itself and electrode film, and seeks to realize the high precision int of electrode pattern.
Preferably said electrode film is the electrode film that forms with the electrode paste that metal and frit constitute.Infiltration ground can not take place when forming electrode film with electrode paste form electrode film accurately.And can improve the adhesive strength of glass-film and electrode film.
Preferably said ceramic particle is at least a particle that comprises in aluminium oxide, zirconia, magnesia, the mullite (mullite).These ceramic particles also can keep coating of particles because fusing point is higher than the glass ingredient that constitutes glass-film when when forming glass-film or electrode film, carrying out sintering processes.
Description of drawings
Fig. 1 is the profile of the coil component of the present invention's one example.
Fig. 2 is the plane graph along the coil component of II-II line shown in Figure 1.
Fig. 3 be III shown in Figure 1 portion want portion's amplification profile.
Fig. 4 is with the general plane graph under the situation on the surface of determination of electron microscopy glass-film shown in Figure 3.
Fig. 5 is the profile of ferrite core of the manufacture process of expression coil component shown in Figure 1.
Fig. 6 is the profile of ferrite core of the operation of following of presentation graphs 5.
Fig. 7 is the general profile that expression is formed at glass-film in the device of ferrite core surface usefulness.
Embodiment
The present invention will be described according to example shown in the drawings below.
The 1st example
As the coil component 1 of an example of the electronic component of the present invention's one example, formation drum type magnetic core as shown in Figure 1 forms glass-film 10 on the whole surface as the ferrite core 2 of element body.
This ferrite core 2 has cylindric or prism-shaped reel core 4 and along the direction of principal axis of this reel core 4 a pair of blade of a sword portion 5 that is formed at both sides in aggregates.The external diameter of blade of a sword portion 5 is bigger than the external diameter of reel core 4, forms the recess 6 that is surrounded by blade of a sword portion 5 in the periphery of reel core 4, at these recess 6 coiling leads 30.
The size of ferrite core 2 is not special to be limited; The external diameter of reel core 4 is 0.6～1.2mm in this example; The direction of principal axis width of reel core 4 is 0.3～1.0mm; The external diameter of blade of a sword portion 5 is 2.0～3.0mm, and the thickness of blade of a sword portion 5 is 0.2～0.3mm, and the degree of depth from the outer surface of blade of a sword portion 5 to the outer surface of reel core 4 is 0.5～1.0mm.Also have, the shape of blade of a sword portion 5 also can be shapes such as the quadrangle, octagon beyond circular.
The material of ferrite core 2 is not special to be limited, and in this example, constitutes with conductivity magnetic materials such as soft magnetic metals such as Mn-Zn ferrite, permalloy, metal press-powders.
On the end face 5a of a blade of a sword portion 5 of the ferrite core 2 that forms glass-film, as depicted in figs. 1 and 2, the position that pair of terminal electrode film 32 is relative in a circumferential direction is formed at the periphery of end face 5a.The pattern of these terminal electrode film 32 usefulness mutually insulateds forms.These terminal electrode films 32 are even ferrite core 2 has conductivity, also owing to the existence of glass-film 10 is insulated.
Glass-film 10 is as shown in Figure 3 in this example, comprises the ceramic particle different with glass ingredient 40.In this example, 10a compares with the la m that is present in glass-film inboard (core 2 one sides) (the 1st layer), and ceramic particle 40 is distributed in top layer (the 2nd layer) 10b that is arranged in face side more.
Particularly under situation, as shown in Figure 4 with the outer surface of sight glass films 10 such as SEM/EDS, find at every 0.01mm
2Unit are, have the ceramic particle 40 of 0.5～20 micron of 10～5000 datum length to expose and be distributed in glass-film 10 surfaces.Also have, the datum length of so-called particle 40 means diameter at particle 40 under the spherical situation, is next its full-size that means of situation of other shapes at particle.
The ceramic particle 40 that datum length is too small, even also can expose on glass-film 10 surfaces, but effect is little, preferably the excessive ceramic particle 40 of datum length is not contained in the glass-film 10, does not expose from the surface.This is in order to make shape of product and dimensional accuracy keep high level.
If the number that the ceramic particle of the per unit area of glass-film 10 outer surfaces exposes is very few, then the contact angle on surface is little, and wettability has excessive tendency, and glass-film 10 has the tendency that becomes big with the adhesive strength (peel strength) of electrode film 32 simultaneously.Again, if the number that the ceramic particle of glass-film 10 outer surface per unit areas exposes is too much, then the contact angle on surface is big, and wettability has the tendency that becomes too small, and glass-film 10 has too small tendency with the adhesive strength (peel strength) of electrode film 32 simultaneously.
As glass ingredient, can adopt the amorphous glass composition, or the sintered glass ceramics composition, not special the qualification for example can be adopted silicon dioxide-boron glass.Specifically, can adopt for example lead borosilicate glass, borosilicic acid bismuth glass, zinc borosilicate glass etc.
Glass-film 10 (la m 10a and top layer 10b) therefore can work as the diaphragm of ferrite core owing to vitrifying after heat treatment.Also have, in this example, so-called vitrifying is defined as continuous non-crystalline solids film, forms the state that has with crystalline phase rigidity together.
The total thickness t 3 of glass-film 10 is advisable with 1～30 micron, and better is 3～20 microns.Again, the thickness t 2 of top layer 10b is advisable with 1/8～1/2 of the gross thickness (thickness t 2 on the thickness t 1+ top layer of la m) of glass-film, preferably its 1/5～1/3.
The ceramic particle 40 that comprises in the glass-film 10 can adopt at high temperature stable materials such as aluminium oxide, zirconia, magnesia, mullite, preferably uses at least a in aluminium oxide, zirconia, magnesia, the mullite.Particle 40 its fusing points of these materials are higher than the glass ingredient that constitutes glass-film 10, therefore when formation glass-film 10 carries out sintering processes with electrode film 32, also can keep coating of particles.
Each terminal electrode film 32 is made up of for example silver, titanium, nickel, chromium, copper or their alloy etc., for example behind the pattern printing conductive paste with regulation on the end face 5a of the blade of a sword portion 5 that forms glass-film, carries out sintering processes and forms.Connect each the end 30a that is wound on the lead 30 on the reel core 4 on each terminal electrode film 32 surface, each terminal electrode film 32 is connected in external circuit.
In this example, each terminal electrode film 32 is in fact as shown in Figure 3, has the structure that the conductive particle 34 that is made up of above-mentioned metal or alloy is scattered in glass for electrode frit 36 inside.Glass for electrode frit 36 can be identical with the glass ingredient of the glass-film 10 that constitutes core 2 also can be different.
An example in the face of the manufacturing approach of the coil component of this example describes down.
At first, prepare the raw material of the material of formation ferrite core 2.As raw material, for example using, oxide such as iron oxide, zinc oxide gets final product.Perhaps also can use and burn till all cpds that the back forms oxide.
Then, raw material of being prepared and adhering resin etc. are mixed, utilize known forming method the shape of this mixture forming for regulation.In this example, be shaped to the drum type magnetic core, obtain the moulding magnetic core.Can also calcine raw material as required, also can the form that be fit to moulding be pulverized in order to form, granulation etc.Can take off processing such as bonding agent to this formed body as required again.Then the formed body that obtains is burnt till, obtain sintered body (ferrite core 2 shown in Figure 5).
Then utilize drum apparatus shown in Figure 7 20, as shown in Figure 6, on the surface of the ferrite core that obtains 2, form glass coating film 10 '.Glass coating film 10 ' becomes glass-film shown in Figure 3 10 after heat treatment.
Shaft core position in the inside of drum container 22, along direction of principal axis configuration nozzle 25, can be from a plurality of ferrite cores 2 spraying slurries 26 of nozzle 25 to the internal storage of drum container 22.Drum container 22 is owing to rotate to the direction of arrow A, and ferrite core 2 exists with state shown in Figure 7, stirs by means of the rotation of drum container 22.
At first, many ferrite cores 2 of packing in drum container shown in Figure 7 22 inside.Make drum container 22 rotation then, the set of stirring ferrite core 2 on one side from nozzle 25 to its spraying (coating) slurries 26, the formation glass coating film.And unnecessary slurries 26 are discharged by not shown discharge pipe.
The ceramic particle that comprises in the slurries, its particle diameter is advisable with 0.5～20 micron, and 1～5 micron is then desirable more, and with respect to the glass powder of 100 weight portions in the slurries, its content is advisable with 0.1～35 weight portion, and better is 10～30 weight portions.
The content of the ceramic particle that contains in the slurries may be controlled to and sprays from nozzle shown in Figure 7 25 that this content is certain value during the slurries 26; If but the content that is controlled to be ceramic particle in the initial stage slurries of spraying is 0 or a small amount of, the later stage of spraying increases the content (weight portion) of ceramic particle in the slurries in above-mentioned scope then desirable more.
Through adopting such method, can access as shown in Figure 3ly, the la m 10a that exists with the inboard (core 2 one sides) of glass-film compares, the ceramic particle 40 more glass-films 10 that distribute at the top layer 10b that is positioned at face side.And the content (weight portion) of ceramic particle 40 through the stipulated standard length in the slurries that are adjusted at the spraying later stage, can control the ratio that the ceramic particle 20 of glass-film 10 lip-deep per unit areas exposes.
The adhering resin that comprises in the slurries 26 is polyvinyl alcohol (PVA), polyvinyl alcohol resin sex change body or their mixture preferably.And with respect to the glass powder of 100 weight portions in these slurries 26, the content of adhering resin is advisable with 10～40 weight portions, and 15～25 weight portions are then desirable more.
Solvent preferably comprises water.Solvent also can be only moisture, but when the contact angle of the surface of glass powder and water is big, is desirable through sneaking into ethanol, isopropyl alcohol (IPA), IBA water-soluble alcohols such as (isobutanols) in certain proportion with the aggegation and the sedimentation of inhibition glass powder.
In this example,, be for example about 30～180 minutes from not special qualification of processing time that nozzle 25 sprays slurries 26.And the temperature of slurries 26 is also relevant with the composition of solvent when spraying, but preferably more than 40 ℃ below 100 ℃.Use under the situation of low-boiling solvent, preferably in the said temperature scope, reduce temperature.
Then, Yi Bian spray slurries 26, Yi Bian the oven dry of filming is simultaneously handled.Dry when handling, it is inner to make oven dry flow into shell 20a with gas from inlet tube 23, discharges from outlet 24.Being used in oven dry that this oven dry handles, to use gas be that for example temperature is 50～100 ℃ a air.Also can after spray treatment, carry out for example 5～30 minutes oven dry again handles.
Through adopting said method, can be once the surface spraying of a lot of ferrite cores 2 be formed roughly glass-film uniformly.
The ferrite core 2 that oven dry after handling is filmed formation takes out from drum container 22, heat-treats.Heat-treat condition is according to the decisions such as softening point T0 of glass powder, and specifically, preferably 600～800 ℃ of heat treatment temperature T1, heat treatment time are 5～30 minutes.Heat treatment temperature T1 is preferably in the temperature range of softening point+0～+ 40 of glass powder ℃.Again, heat treatment temperature T1 is the temperature lower than the fusing point T2 of the ceramic particle that comprises in the glass coating film 10 ' 40.When carrying out this heat treatment, the ceramic particle 40 that comprises in the glass coating film 10 ' have some to dissolve in the glass ingredient, but its particle diameter is almost constant along with the glass ingredient in the glass coating film 10 ' is softening.
Heat treatment is preferably burnt till in the nitrogen atmosphere of partial pressure of oxygen below 0.1%.Through reducing partial pressure of oxygen, under the situation that for example ferrite core is made up of the Mn-Zn ferrite, can prevent the oxidation of ferrite core.In case the oxidation of Mn-Zn ferrite just forms bloodstone, be the reason that causes deterioration in characteristics.Again, also there is the problem of oxidation in the Ni-Zn ferrite because of the relation of forming.
After the heat treatment, on the surface of ferrite core 2, the vitrified glass-film 10 of formation as shown in Figure 6 obtains drum-shaped magnetic core.Thereafter as shown in Figure 3, on the end face of a blade of a sword portion 5 of each ferrite core 2, utilize method formation pair of terminal electrode films 32 such as printing.Even terminal electrode film 32 ferrite cores 2 have conductivity, also owing to the existence of glass-film 10 is insulated.
Thereafter, the lead 30 of around reel core 4, reeling utilizes methods such as welding methods such as thermo-compressed, ultrasonic wave or laser, soldering that the two ends of this lead are connected to terminal electrode film 32, accomplishes coil component 1 shown in Figure 1.
The coil component 1 of this example has the distributing ceramic particle 20 of specific length of the number of regulation ratio with per unit area on the surface of glass-film 10.Therefore when utilizing for example electrode paste printing process on the surface of this glass-film 10, to form the electrode film 32 of predetermined pattern, can not have infiltration, form electrode film 32 accurately.And can improve the adhesive strength of glass-film 10 and electrode film 32.It is believed that; Can realize these action effects be because the ceramic particle that exposes on the surface of glass-film 10 40 its with electrode film 32 between play the infiltrating effect that adjustment forms the electrode paste film of electrode film 32, while ceramic particle after vitrifying plays fixation.
Again; In the coil component 1 of this example; On the surface of glass-film 10, the distributing ceramic particle 20 of specific length of the number of regulation ratio is arranged with per unit area; Therefore in the manufacture process of coil component 1, can seek to prevent that the core 2 that forms glass-film 10 from adhere each other, preventing that core 2 and the instrument adhesion of burning till usefulness from causing is out of shape or causes breakage.And can improve the resistance to wear on the surface (surface of glass-film) of core 2, and also can improve intensity simultaneously, prevent be full of cracks and damaged.And, can improve insulating properties owing to for example have that ceramic particles such as aluminium oxide, zirconia, magnesia, mullite distribute and expose on the surface of glass-film, ion is moved be not easy generation.
In this example, utilize drum apparatus shown in Figure 7 20, as shown in Figure 6, the glass coating film 10 ' of formation specific thickness t3 ' on the surface of the ferrite core that obtains 2.And in this example, utilize drum apparatus shown in Figure 7 20, through the content of the ceramic particle 40 that from the slurries that nozzle 25 blows out, comprises of adjustment, can control glass-film 10 lip-deep per unit areas ceramic particle 20 expose ratio.
And in this example, as shown in Figure 3, compare the more top layer 10b that are positioned at face side that are distributed in of ceramic particle 40 with the la m 10a of glass-film 10 more.Therefore in this example, glass-film 10 in the close property that improves with the surface of core 2, also can seek electrode pattern high precision int and with the raising of the adhesive strength of electrode film 32.
The 2nd example
In this example; The softening point height of softening point than the glass ingredient that comprises among the la m 10a (la m glass ingredient) of the glass ingredient that in making top layer 10b shown in Figure 3, comprises (skin glass composition); Identical with the 1st example, its repeat specification is omitted.The softening point of glass ingredient utilizes for example differential thermal analysis method to measure.
In this example, use device 20 shown in Figure 7, when on ferrite core 2, spraying slurries 26, change with the content that makes the glass powder that contains in the slurries 26 latter stage in the early stage.Specifically, add in the slurries 26 at initial stage,, add in the slurries 26 and get final product forming glass powder that face side that top layer 10b uses should comprise in filming in latter stage with forming the glass powder that inboard that la m 10a uses should comprise in filming.That is to say, change glass powder, make the softening point of the glass powder that face side comprises in filming higher than the softening point of the glass powder that comprises in inboard the filming.Through doing like this, can on the surface of ferrite core 2, form the inboard that comprises the different glass powder of softening point and film and film with face side.
Also have, the glass powder that softening point is different is made as long as change the kind of glass powder.The diverse situation of so-called glass powder has as lead glass and bismuth glass, and the condition of different of glass own also has the condition of different such as amount and kind of additive (for example auxiliary element).
In this example, the high temperature of softening point of the glass powder that in filming, comprises (la m glass ingredient) than the inboard, and be that the low temperature of softening point of the glass powder (skin glass composition) that comprises during the specific surface side is filmed is heat-treated.
Consider that through doing like this it is whole or the face side surface of filming is softening at least that face side is filmed, or only reach the low state of viscosity of softening initial stage.Consequently, can prevent effectively that core 2 is inter-adhesive or be bonded at and cause the defective and the thickness deviation of filming on the firing furnace.Can prevent effectively that again foreign matter is attached on the glass coating film.And the glass ingredient that can confirm the top layer is also the same with the inner glass composition after heat treatment vitrifying takes place and hardens, though its reason may not be clear.Being considered to this is because receive vitrified influence of la m.
In this example, form the ceramic particle 40 that face side that top layer 10b shown in Figure 3 uses comprises in filming and nearly all do not dissolve in the glass ingredient that comprises among the 10b of top layer, the ratio of exposing of the ceramic particle 20 of the per unit area on glass-film 10 surfaces is controlled easily.
The 3rd example
In this example, use device 20 shown in Figure 7, spraying during slurries 26 on ferrite core 2 makes at the spraying initial stage to comprise glass powder in the slurries and do not comprise ceramic powders, makes in the latter stage of spraying not comprise glass powder in the slurries and comprise ceramic powders.
Through doing like this, as shown in Figure 3, when on the surface of ferrite core 2, forming glass-film 10, can make the ceramic particle 40 that is distributed in the top layer 10b that is positioned at face side than the ceramic particle that is distributed in la m 10a more than 40.In this example, except top said, identical with the 1st example, repeat specification is omitted.
Also have, the invention is not restricted to above-mentioned example, within the scope of the invention various changes can be arranged.
For example in above-mentioned example; The glass-film 10 that covers the outer surface of core 2 is divided into more top layer 10b of the ceramic particle 40 of distribution and less la m 10a; But in the present invention; Not necessarily be necessary to be separated into top layer 10b and la m 10a, ceramic particle 40 also can evenly distribute on the thickness direction of glass-film 10.But it is favourable in being close on the degree of the surface of improving glass-film 10 and core 2 that glass-film 10 is divided into the more top layer 10b of the ceramic particle 40 of distribution and less la m 10a.
Again, ferrite core is not limited to the ferrite core 2 of coil component, also can be the core of inductance devices such as transformer.Again, the material of core is not special to be limited, and can be the core that constitutes such as ferrite, aluminium oxide, iron for example.And electronic component of the present invention also can be that ceramic laminated chip element such as piezo-resistance, thermistor, electric heater, coil, Nd-Fe are metal magnet etc.
Embodiment
According to specific embodiment the present invention is further described below, but the invention is not restricted to these embodiment.
Embodiment 1
Prepare Fe
2O
3, ZnO, MnO be as the ferrite composite raw material that constitutes ferrite core.After weighing the powder of raw material of preparation then, carry out wet mixed with ball mill and obtain raw mix.After the mixture calcining that obtains, carry out case of wet attrition, oven dry again, obtain material powder.
The PVA that in this material powder, adds as adhering resin carries out granulation formation particle.This particle is carried out the core formed body that extrusion forming obtains cydariform.
Then, this formed body is burnt till in air and nitrogen atmosphere, obtain ferrite core as sintered body.Ferrite core 2 its blade of a sword portion diameters are 3mm, and blade of a sword portion thickness is 0.25mm.On the ferrite core that obtains 2, the formation glass-film is described below.
At first, make the silica glass frit end of 740 ℃ of softening points, 1.5 microns of average grain diameters, this glass powder is mixed with the weight ratio of regulation with the PVA resin.In that the solid state component that obtains (mixture of glass powder and PVA) is mixed with the weight ratio of regulation with solvent, carry out 16 hours mixing with ball mill, be ready to the 1st slurries.Make water and alcohol with the mixture of 8: 2 mixed as solvent.With respect to the glass powder of 100 weight portions in the 1st slurries, the content of adhering resin is 17 weight portions.The softening point of filming that utilizes the 1st slurries to form is 740 ℃.
Again, except the content with respect to the glass powder adhering resin of 100 weight portions is 8 weight portions, the same the 2nd slurries made from the 1st slurries.The softening point of filming that utilizes the 2nd slurries to form is 740 ℃.
Make the silica glass frit end of 780 ℃ of softening points, 1.0 microns of average grain diameters; With respect to the glass powder of 100 weight portions, the content of adhering resin is 10 weight portions, and making particle diameter is that 0.5～20 micron zirconia particles (ceramic particle) content does; Glass powder with respect to 100 weight portions; The ceramic particle that contains 0.10 weight portion, the same with the 1st slurries in addition, make the top layer and use slurries.
Then, utilize drum apparatus that spray treatment is carried out with above-mentioned the 1st slurries in the surface of ferrite core 2, film with this 1st inboard that forms 10 microns of thickness.Then, carry out inject process, film with this 2nd inboard that forms 10 microns of thickness with the 2nd slurries.Then utilize the top layer to carry out spray treatment again, film with this face side that forms 5 microns of thickness with slurries.That is to say that the gross thickness of filming is 25 microns.
To 1000 ferrite cores 2, utilize visual means inspection, the number of the part of the defective (show-through defective) that has the surface that to see ferrite core 2 of confirming to film.The incidence that has the ferrite core 2 of show-through defective is 0.0%.Utilize to draw and scrape test to draw the ratio of the film-strength (before the heat treatment) of filming the 1st inboard and the 2nd inboard filming be more than 2.0 times or 2 times again.
The ferrite core 2 of under 760 ℃ temperature, formation being filmed thereafter, carries out 1 hour heat treatment.This heat treatment temperature is softening point (740 ℃) height of filming than the inboard, and the low temperature of the softening point temperature that the specific surface side is filmed (780 ℃).
To the thickness deviation of the glass-film after the ferrite core 2 mensuration heat treatments of same number, with respect to 10 microns of average film thickness, the standard deviation of expression thickness deviation is 0.90, can confirm that the deviation of thickness is also little again.
Again the ferrite core of similar number 2 is measured the situation of adhering to foreign matters such as rubbish on the glass-film after the heat treatments, observing the part ratio that foreign matter adheres to is 0.1%, confirms to have situation that foreign matter adheres to seldom.
Again to 10 ferrite cores 2,, observe every 0.01mm in 1000 times the image with the surface of SEM/EDS sight glass film 10
2Unit are on average have the zirconium particle of 0.5～20 micron grain size of the ratio shown in the table 1 on the glass-film surface, to distribute and expose.
To the ferrite core of observing with SEM/EDS 2, utilize tangential method to measure the contact angle on surface, the result who obtains is shown in table 1.Form the electrode film of predetermined pattern again on the surface of the glass-film 10 of identical ferrite core 2, measure peel strength, the result is shown in table 1.
It is conductive particle 34 shown in Figure 3 that electrode film 32 uses with Ag, and the electrode paste that mixes with glass frit, the thickness of electrode film 32 are 20 microns.
The peel strength that electrode film 34 is peeled off from glass-film 10 mensuration that is described below.Promptly at first will on glass-film 10 surfaces, be formed with the sample of the ferrite core 2 of electrode film 34, and utilize bonding agent to be adhered to test and use substrate surface, when bonding with the surface of electrode film 34 as bonding plane.Then the sample of core 2 is pressurizeed (applying shearing force) with the direction of substrate surface being parallel to test,, obtain peel strength (N) through asking the plus-pressure (shearing force) of electrode film 34 when the glass-film 10 of core 2 strips down.
Except with respect to 100 weight portion glass powders; Zirconia particles (ceramic particle) content is outside 2 weight portions; The same with embodiment 1, on a plurality of ferrite cores 2, form glass-film 10, form electrode film 32 on its surface; Equally with embodiment 1 measure number, contact angle and the peel strength that the zirconium particle exposes on the surface, the result is shown in table 1.
Embodiment 3
Except with respect to 100 weight portion glass powders; Zirconia particles (ceramic particle) content is outside 20 weight portions; The same with embodiment 1, on a plurality of ferrite cores 2, form glass-film 10, form electrode film 32 on its surface; Equally with embodiment 1 measure number, contact angle and the peel strength that the zirconium particle exposes on the surface, the result is shown in table 1.
Except with respect to 100 weight portion glass powders; Zirconia particles (ceramic particle) content is outside 30 weight portions; The same with embodiment 1, on a plurality of ferrite cores 2, form glass-film 10, form electrode film 32 on its surface; Equally with embodiment 1 measure number, contact angle and the peel strength that the zirconium particle exposes on the surface, the result is shown in table 1.
Comparative example 1
Except with respect to 100 weight portion glass powders; Zirconia particles (ceramic particle) content is outside 0.05 weight portion; The same with embodiment 1, on a plurality of ferrite cores 2, form glass-film 10, form electrode film 32 on its surface; Equally with embodiment 1 measure number, contact angle and the peel strength that the zirconium particle exposes on the surface, the result is shown in table 1.
Comparative example 2
Except with respect to 100 weight portion glass powders; Zirconia particles (ceramic particle) content is outside 40 weight portions; The same with embodiment 1, on a plurality of ferrite cores 2, form glass-film 10, form electrode film 32 on its surface; Equally with embodiment 1 measure number, contact angle and the peel strength that the zirconium particle exposes on the surface, the result is shown in table 1.
Estimate
As shown in table 1; Confirm the per unit area on the outer surface of glass-film 10 ceramic particle if to expose number very few; Then have the contact angle on surface to diminish, the tendency that wettability is excessive confirms that simultaneously the glass-film 10 and the adhesive strength (peel strength) of electrode film 32 have the tendency that becomes big.Again; The ceramic particle of the per unit area on glass-film 10 outer surfaces expose granule number, if too much, then have the contact angle on surface to become big; The tendency that wettability diminishes also confirms that the glass-film 10 and the adhesive strength (peel strength) of electrode film 32 have too small tendency simultaneously.
If contact angle is little, wettability is excessive, permeates easily when then electrode film prints and comes, and printing precision can variation.Thereby contact angle is preferably more than 20 °.Again, if peel strength is little, then electrode film 32 strips down from glass-film 10 easily, therefore preferably more than the 40N.Thereby the ceramic particle that affirmation is exposed on glass-film 10 surfaces is advisable with 10～5000 of per unit areas, and 10～4980 then desirable more.
Except zirconia particles (ceramic particle) changes into aluminium oxide, magnesia, the mullite; The same with embodiment 1～4 and comparative example 1,2; On a plurality of ferrite cores 2, form glass-film 10; Form electrode film 32 on its surface, the same with embodiment 1, measure number, contact angle and peel strength that ceramic particle exposes on the surface.Obtain the result the same with embodiment 1～4 and comparative example 1,2.
Table 1
Symbol description
1 coil component
2 ferrite cores
10 glass-films
The 10a la m
The 10b top layer
10 ' glass coating film
20 drum apparatus
30 leads
32 electrode films
34 conductive particles
36 glass frits
40 ceramic particles
Claims (4)
1. electronic component, glass-film and the electrode film that is formed at said glass-film surface with at least a portion of element body, the said element body of lining is characterized in that,
The ceramic particle that datum length is 0.5～20 micron distributes with the ratio of 10～5000 of the unit ares of every 0.01mm2 on said glass-film surface and exposes.
2. electronic component according to claim 1 is characterized in that,
Perpendicular to observing under the situation of said glass-film with at least one cross section at the interface of the par of said element body,
Said glass-film have with surface contact the 1st layer with the 2nd layer that contacts with said interface,
Compare said the 1st layer of more said ceramic particle that distributing with said the 2nd layer.
3. electronic component according to claim 1 and 2 is characterized in that, said electrode film is the electrode film that forms with the electrode paste that metal and frit constitute.
4. according to each the described electronic component in the claim 1～3, it is characterized in that,
Said ceramic particle is at least a particle that comprises in aluminium oxide, zirconia, magnesia, the mullite (mullite).
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| CN105938754A (en) * | 2015-03-04 | 2016-09-14 | 株式会社村田制作所 | Electronic component and method for manufacturing electronic component |
| CN109478465A (en) * | 2016-07-01 | 2019-03-15 | 摩达伊诺琴股份有限公司 | Chip component and its manufacturing method |
| US10431365B2 (en) | 2015-03-04 | 2019-10-01 | Murata Manufacturing Co., Ltd. | Electronic component and method for manufacturing electronic component |
| CN110462764A (en) * | 2017-03-24 | 2019-11-15 | 日立金属株式会社 | Band terminal compressed-core and its manufacturing method |
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| JP6341138B2 (en) * | 2015-04-10 | 2018-06-13 | 株式会社村田製作所 | Surface mount inductor and manufacturing method thereof |
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| CN102314995B (en) | 2013-07-10 |
| JP2012009548A (en) | 2012-01-12 |
| JP5267511B2 (en) | 2013-08-21 |
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