CN104465020A - Cascading inductor based on metal magnetic slurry and preparation method thereof - Google Patents
Cascading inductor based on metal magnetic slurry and preparation method thereof Download PDFInfo
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Abstract
The invention firstly aims to provide a cascading inductor based on metal magnetic slurry. The cascading inductor comprises a first base body, an interlayer and a second base body, wherein the first base body, the interlayer and the second base body are arranged from bottom to top. The interlayer comprises at least two single-layers arranged from bottom to top. Each single-layer comprises a dielectric layer, a packing layer and a coil electrode, wherein the dielectric layer is provided with a through hole in the vertical direction; the packing layer is arranged at the through hole, and the upper surface of the packing layer is not lower than the upper surface of the dielectric layer; the coil electrode is arranged on the upper surface of the dielectric layer and located around the packing layer; the packing layer comprises inorganic powder bodies composed of metal magnetic powder, lead-free glass powder, organic carriers and auxiliaries. The cascading inductor based on the metal magnetic slurry is simple in overall structure; since the packing layers are made of metal alloy materials with high saturation flux density, the saturation magnetization intensity of the whole cascading inductor is improved, and then the rated current is increased. The invention secondly aims to provide a preparation method of the cascading inductor based on the metal magnetic slurry. By means of the preparation method, the process steps are simple, the cost is low, and the cascading inductor is quite suitable for large-scale batch production.
Description
Technical field
The present invention relates to Stacked member arts, especially, relate to a kind of laminated inductor based on metal magnetic slurry and preparation method thereof.
Background technology
Along with complete electronic set is to digitlization, high frequency, multifunction and thin, light, little, portable future development, electronic devices and components are also to chip type, multiple stratification and microminiaturized future development.In recent years, common stacked ferrite inductor relies on self advantage such as high reliability, shielding, be widely used, but its rated current and D.C. resistance can not meet the needs of existing complete machine in fields such as mobile phone, audio/video, computers.Although consumer electronics product lightening, thin, short, little, the output voltage of power supply does not decline to a great extent, and inner electronic devices and components, while small-sized slimming, also must meet higher rated current, lower D.C. resistance.The requirements of various electronic product to electronic devices and components such as smart mobile phone, panel computer, notebook computer, automatic navigator, Set Top Box, LCD TV are more and more higher.
In prior art, stacked inductor of a great variety, as follows:
The invention that application number is 200610163373.6 provides one to improve DC superposition characteristic, and can prevent the laminated inductor of the reduction of inductance value.Utilize with the increase hindering the magnetic flux that configured by the mode of the magnetic flux inside coil to be suppressed magnetic flux density by inhibition layer, therefore, enough suppress the magnetic saturation when additional direct current and improve DC superposition characteristic.And, by making magnetic flux thin by the thickness of part near the Thickness Ratio conductor layer of the hub of a spool part of inhibition layer, the magnetic resistance of the low hub of a spool part of magnetic flux density can be reduced, prevent inductance value be subject to the impact of this magnetic resistance and reduce.
The patent of invention that application number is 200710105457.9 provides a kind of laminated inductor, stacked with NI-ZN-CU class ferrite multiple first insulator layer that is main component be the multiple conductor layer of main component with AG, in the inside of duplexer, spiral coil is set, spiral coil is that multiple conductor layer and via conductors are interconnected and form, the second insulator layer of rectangle is configured in the mode of the inner side magnetic circuit crossing spiral coil, second insulator layer is to have the ZN class ferrite of the permeability lower than the permeability of the first insulator layer for main component, and, the interarea edge part of the second insulator layer and conductor layer are overlapping in the stacking direction, in the part of this overlap, second insulator layer contacts with conductor layer.
Application number be 201310165514.8 application discloses a kind of inductor, this inductor comprises multiple first conducting plane layer and at least one second conducting plane layer, wherein, each first conducting plane layer has the helical structure of planar inductor, and at least part of first conducting plane layer has ground level, and the second conducting plane layer entirety is reference horizontal plane of manufacturing, multiple first conducting plane layer and the second conducting plane layer are arranged with overlapped way, and, the continuous stacked setting of multiple first conducting plane layer, between the helical structure of the first adjacent conducting plane layer, there is interval and be electrically connected by syndeton.
In addition the inductor of some other structure is also had, but it is low or/and the defect of high D.C. resistance all to there is rated current, therefore, the concrete very important meaning of inductor can simultaneously compared with a kind of and existing inductor with high rated current and low D.C. resistance is designed.
Summary of the invention
The first object of the present invention is to provide a kind of laminated inductor based on metal magnetic slurry, and concrete technical scheme is as follows:
Based on a laminated inductor for metal magnetic slurry, comprise arrange from the bottom to top the first matrix, intermediate layer and the second matrix, described intermediate layer comprises at least 2 layers of individual layer arranged from the bottom to top;
Described individual layer comprises dielectric layer, packed layer and coil electrode, and described dielectric layer is provided with through hole along the vertical direction; Described packed layer is arranged on described through hole, and the upper surface of described packed layer is not less than the upper surface of described dielectric layer; The thickness of described along the vertical direction packed layer is 1.0-1.5 times of the thickness of described dielectric layer; The upper surface that described coil electrode is arranged on described dielectric layer is positioned at the surrounding of described packed layer, and described coil electrode is provided with conduction draws hole; The dielectric layer of (n+1)th layer of described individual layer is provided with and draws the corresponding point electrode in hole with the described conduction of individual layer described in n-th layer, n be more than or equal to 1 natural number;
Described packed layer comprises the following material with weight parts: the inorganic particle 6-8 part be made up of metallic magnetic powder, lead-free glass powder 1-2 part, organic carrier 1-2 part and auxiliary agent 1-2 part.
Preferred in above technical scheme, on the upper surface of described dielectric layer, the shape of described through hole is circle, triangle, ellipse or quadrangle; Described through hole is arranged on the centre of described dielectric layer; The thickness of described along the vertical direction packed layer is 1.0-1.2 times of the thickness of described dielectric layer.
Preferred in above technical scheme, the material of described first matrix, the second matrix and dielectric layer all adopts initial permeability to be the nickel-zinc-ferrite material of 300 ~ 600H/m.
Preferred in above technical scheme, described inorganic particle comprises at least one in sendust, iron-nickel alloy, ferro-silicium, carbonyl iron dust and molybdenum permalloy; Described inorganic particle comprises inorganic particle and comprises following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 1-5 part, potassium oxide 1-5 part, diboron trioxide 10-25 part, bismuth oxide 10-25 part and silicon dioxide 35-55 part; Described organic carrier comprises the following material with weight parts: high boiling solvent 10-25 part and binding agent 1-5 part; Described auxiliary agent comprises the following material with weight parts: dispersant 1-5 part, plasticizer 1-2 part, thixotropic agent 1-2 part and coupling agent 1-2 part.
Preferred in above technical scheme, described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part.
Preferred in above technical scheme, described high boiling solvent comprises at least one in butyl carbitol, terpinol, butyl carbitol acetate and turpentine oil; Described binding agent comprises at least one in ethyl cellulose, hydroxylated cellulose and polyvinyl butyral resin.
Preferred in above technical scheme, described packed layer comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 6 parts, lead-free glass powder 2 parts, organic carrier 1 part and auxiliary agent 1 part; Described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 1 part, potassium oxide 1 part, diboron trioxide 10 parts, bismuth oxide 10 parts and silicon dioxide 35 parts; Described organic carrier comprises the following material with weight parts: butyl carbitol 10 parts, terpinol 10 parts and hydroxylated cellulose 5 parts; Described auxiliary agent comprises the following material with weight parts: triethanolamine 1 part, triethylene glycol two tricaprylate 1 part and polyamide wax 2 parts and γ-methacryloxypropyl trimethoxy silane 1 part;
Or described packed layer comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 7 parts, lead-free glass powder 1 part, organic carrier 1 part and auxiliary agent 1 part; Described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 2 parts, potassium oxide 2 parts, diboron trioxide 15 parts, bismuth oxide 15 parts and silicon dioxide 45 parts; Described organic carrier comprises the following material with weight parts: butyl carbitol 15 parts, terpinol 5 parts and ethyl cellulose 3 parts; Described auxiliary agent comprises the following material with weight parts: triethanolamine 1 part, triethylene glycol two tricaprylate 1 part, polyamide wax 2 parts and γ-methacryloxypropyl trimethoxy silane 2 parts;
Or described packed layer comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 7 parts, lead-free glass powder 1 part, organic carrier 1.5 parts and auxiliary agent 1.5 parts; Described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 3 parts, potassium oxide 3 parts, diboron trioxide 20 parts, bismuth oxide 20 parts and silicon dioxide 40 parts; Described organic carrier comprises the following material with weight parts: butyl carbitol 10 parts, terpinol 15 parts and binding agent 2 parts; Described auxiliary agent comprises the following material with weight parts: triethanolamine 2 parts, triethylene glycol two tricaprylate 2 parts, polyamide wax 1 part and γ-methacryloxypropyl trimethoxy silane 2 parts;
Or described packed layer comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 8 parts, lead-free glass powder 1 part, organic carrier 2 parts and auxiliary agent 2 parts; Described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 5 parts, potassium oxide 5 parts, diboron trioxide 25 parts, bismuth oxide 25 parts and silicon dioxide 35 parts; Described organic carrier comprises the following material with weight parts: butyl carbitol 5 parts, terpinol 15 parts and binding agent 1 part; Described auxiliary agent comprises the following material with weight parts: triethanolamine 2 parts, triethylene glycol two tricaprylate 2 parts, polyamide wax 1 part and γ-methacryloxypropyl trimethoxy silane 1 part.
Apply the laminated inductor based on metal magnetic slurry of the present invention, there is following technique effect:
(1) laminated inductor based on metal magnetic slurry of the present invention comprise arrange from the bottom to top the first matrix, intermediate layer and the second matrix, described intermediate layer comprises the individual layer of at least 2 layers of stacked setting from the bottom to top, described individual layer comprises dielectric layer, packed layer and coil electrode, and overall structure is simplified; Packed layer comprises the inorganic particle, lead-free glass powder, organic carrier and the auxiliary agent that are made up of metallic magnetic powder, packed layer adopts the design of the metal alloy compositions of high saturation magnetic flux density, improve the saturation magnetization of whole laminated inductor, and then improve rated current.
(2) prior art adjusts inductance value by the number of turns and size regulating electrode coil, and in small size coil size to the limit, the number of turns can only be adjusted, can not meet the demand of all specification inductance values, and by the magnetic permeability of material in the shape of adjustment through hole and through hole in the present invention, meet the demand of different size inductance value, practical.
(3) material of the first matrix described in the present invention, the second matrix and dielectric layer all adopts initial permeability to be the nickel-zinc-ferrite material of 300 ~ 600H/m, make coil outer dielectric layer, thus it is very little to make laminated inductor overall inductance amount decline, and do not need additionally to increase the number of turns to maintain inductance value, thus D.C. resistance can reduce greatly.
(4) in the present invention, the compositional selecting of packed layer is reasonable, and raw material easily obtains, and makes the laminated inductor based on metal magnetic slurry of the present invention have high rated current and low D.C. resistance, meets the demand of reality, practical.
The second object of the present invention is the preparation method providing a kind of laminated inductor based on metal magnetic slurry, specifically comprises the following steps:
Step one: prepare metal magnetic slurry, be specially: inorganic particle, lead-free glass powder, organic carrier and auxiliary agent are mixed according to proportioning, and obtain metal magnetic slurry after grinding with three-roll grinder, wherein, described metal magnetic slurry viscosity when temperature 25 DEG C is 100 ± 20Pas;
Step 2: make the first matrix, be specially: adopt LTCC dry method or dry jet wet spinning technique that nickel-zinc ferrite slurry curtain coating is obtained the first matrix;
Step 3: the first matrix obtained in step 2 makes intermediate layer, be specially: by the shape of setting through hole, it is punched on dielectric layer, described through hole is arranged along the vertical direction, then the stacked 1st layer of dielectric layer first had openning hole on the first matrix, the described metal magnetic slurry obtained in through hole print steps one forms packed layer, wherein, along described through hole central axial direction described in the thickness of packed layer be the 1.0-1.5 of the thickness of described dielectric layer doubly; Then print and draw the coil electrode in hole with conduction, the upper surface that described coil electrode is arranged on described dielectric layer is positioned at the surrounding of described packed layer;
The dielectric layer that the dielectric layer of n-th layer individual layer first has openning hole in stacked (n+1)th layer of individual layer, wherein n be more than or equal to 2 natural number; The described metal magnetic slurry obtained in through hole print steps one forms packed layer, wherein, along described through hole central axial direction described in the thickness of packed layer be the 1.0-1.5 of the thickness of described dielectric layer doubly; Then at described through hole printing points electrode; Finally print the coil electrode drawing hole with conduction, the upper surface that described coil electrode is arranged on the dielectric layer of (n+1)th layer of individual layer is positioned at the surrounding of described packed layer, and wherein said conduction draws hole and the corresponding setting of described point electrode on n-th layer individual layer dielectric layer 121;
Step 4: make the second matrix, be specially: stacked diaphragm obtains the second matrix on the intermediate layer that step 3 obtains;
Step 5: finished product, be specially: the crude product with the first matrix, intermediate layer and the second matrix step 4 obtained, through overbaking cutting, binder removal sintering chamfering, end-blocking, surface treatment, test process, obtains the finished product of the laminated inductor based on metal magnetic slurry.
Preferred in above technical scheme, described packed layer is realized by metal magnetic slurry described in continuous printing step one.
Preferred in above technical scheme, the concrete technology that in described step one, three-roll grinder carries out grinding is: adopt slow roller rotating speed 32rpm/min, central roll rotating speed 89rpm/min and fast roller rotating speed 250rpm/min simultaneous grinding 4-10 hour; The concrete preparation process of described first matrix is: just nickel-zinc-ferrite material, organic solvent, organic carrier are configured to nickel-zinc ferrite slurry through ball milling, then nickel-zinc ferrite slurry curtain coating becomes the diaphragm of 10-80 micron thickness, cut into the square diaphragm that Length x Width is 125 millimeters, by square pressing diaphragm synthesis 100-600 micron thickness, obtain the first matrix; Dielectric layer in described step 3 is the diaphragm of 10-80 micron thickness; The preparation method of the second matrix in described 4th step and structure are all identical with the preparation method of the first matrix described in described step 2 and structure.
Apply preparation method of the present invention, have following technique effect: the present invention adopts LTCC dry method or wet-dry change technique, and processing step is simplified, technological parameter is convenient to control, whole stable production process, low, the very applicable large-scale mass production of high efficiency, cost.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the exploded view of the preferred embodiment of the present invention 1 based on the laminated inductor of metal magnetic slurry;
11-first matrix, 12-intermediate layer, 121-dielectric layer, 122-packed layer, 123-coil electrode, 13-second matrix, A-through hole, B-conduction draws hole, C-point electrode.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can limit according to claim and cover is implemented.
Embodiment 1:
A kind of laminated inductor based on metal magnetic slurry, refer to Fig. 1, specifically comprise arrange from the bottom to top the first matrix 11, intermediate layer 12 and the second matrix 13, described intermediate layer 12 comprises 3 layers of individual layer arranged from the bottom to top, and the quantity of individual layer can also be selected according to the actual requirements.
1st layer of described individual layer comprises dielectric layer 121, packed layer 122 and coil electrode 123, described dielectric layer 121 is provided with through hole A (described through hole A is preferably positioned at the centre of described dielectric layer 121, and the area of described through hole A is 0.1-0.8 times of the upper surface area of described dielectric layer 121 on the upper surface of described dielectric layer 121) along the vertical direction; Described packed layer 122 is arranged on described through hole A place, the thickness of described along the vertical direction packed layer 122 is identical (herein with the thickness of described dielectric layer 121, the thickness of described packed layer 122 can slightly larger than the thickness of described dielectric layer 121, only otherwise affect the switching performance of whole laminated inductor, the thickness of concrete described packed layer 122 can be 1.0-1.5 times of the thickness of described dielectric layer 121, be more preferably 1.0-1.2 doubly), and the upper surface of described packed layer 122 is not less than the upper surface of described dielectric layer 121; The upper surface that described coil electrode 123 is arranged on described dielectric layer 121 is positioned at the surrounding (surrounding herein preferably coil electrode 123 and described packed layer 122 has contact site) of described packed layer 122, and described coil electrode 123 is provided with conduction draws hole B.
On the upper surface of described dielectric layer 121, the shape of described through hole A is rectangle, or in the plane parallel with the upper surface of described dielectric layer 121, the shape of described through hole A is rectangle, can also select circle, triangle, ellipse etc. structure according to the actual requirements.
Dielectric layer 121 in 2nd layer and the 3rd layer of described individual layer is also provided with and draws the corresponding point electrode C of hole B (dielectric layer 121 in the 1st layer of described individual layer also can arrange according to the actual requirements and draw the corresponding point electrode C of hole B with described conduction) respectively with the described conduction on the dielectric layer in front 1 layer of described individual layer.
Wherein, described packed layer 122 comprises the following material with weight parts: the inorganic particle 6-8 part be made up of metallic magnetic powder, lead-free glass powder 1-2 part, organic carrier 1-2 part and auxiliary agent 1-2 part, preferably: the inorganic particle be made up of metallic magnetic powder 6 parts, lead-free glass powder 2 parts, organic carrier 1 part and auxiliary agent 1 part, wherein said inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part.Described lead-free glass powder comprises the following material with weight parts: lithia 1-5 part, potassium oxide 1-5 part, diboron trioxide 10-25 part, bismuth oxide 10-25 part and silicon dioxide 35-55 part, preferably: lithia 1 part, potassium oxide 1 part, diboron trioxide 10 parts, bismuth oxide 10 parts and silicon dioxide 35 parts.Described organic carrier comprises the following material with weight parts: high boiling solvent 10-25 part and binding agent 1-5 part, described high boiling solvent comprises at least one in butyl carbitol, terpinol, butyl carbitol acetate and turpentine oil, described binding agent comprises at least one in ethyl cellulose, hydroxylated cellulose and polyvinyl butyral resin, preferably: butyl carbitol 10 parts, terpinol 10 parts and hydroxylated cellulose 5 parts.Described auxiliary agent comprises the following material with weight parts: dispersant 1-5 part, plasticizer 1-2 part, thixotropic agent 1-2 part and coupling agent 1-2 part, preferably: triethanolamine 1 part, triethylene glycol two tricaprylate 1 part, polyamide wax 2 parts and γ-methacryloxypropyl trimethoxy silane 1 part.Packed layer comprises the inorganic particle, lead-free glass powder, organic carrier and the auxiliary agent that are made up of metallic magnetic powder, packed layer adopts the design of the metal alloy compositions of high saturation magnetic flux density, improve the saturation magnetization of whole laminated inductor, and then improve rated current.
The material of described first matrix 11, second matrix 13 and dielectric layer 121 all adopts initial permeability to be the nickel-zinc-ferrite material of 300 ~ 600H/m, external agency layer adopts the Ferrite Material of high magnetic permeability, laminated inductor inductance value declines very little, and do not need additionally to increase the number of turns to maintain inductance value, thus D.C. resistance can reduce greatly.
The preparation method of the above-mentioned laminated inductor based on metal magnetic slurry, comprises the following steps:
The first step: prepare metal magnetic slurry, be specially: inorganic particle, lead-free glass powder, organic carrier and auxiliary agent are mixed according to proportioning, and obtain metal magnetic slurry with after three-roll grinder grinding, wherein, described metal magnetic slurry viscosity when temperature 25 DEG C is 80Pas; The concrete technology that in described step one, three-roll grinder carries out grinding is: adopt slow roller rotating speed 32rpm/min, central roll rotating speed 89rpm/min and fast roller rotating speed 250rpm/min to grind 4 ~ 10 hours altogether;
Second step: make the first matrix 11, be specially: adopt LTCC dry method or dry jet wet spinning technique by nickel-zinc-ferrite material 45-55 part, organic solvent (n-propyl acetate: isobutanol=4:1) 45-55 part, organic carrier (polyvinyl butyral resin: triethylene glycol two tricaprylate: Triton X-100=42:12:1) 5-15 part, ball milling 20-40 hour, rotating speed is be configured to nickel-zinc ferrite slurry under 30-75rpm/min condition, discharging viscosity is 35-65 second (Cai grace 2# cup), then nickel-zinc ferrite slurry curtain coating becomes the diaphragm of 10-80 micron thickness, cut into the square diaphragm that Length x Width is 125 millimeters, by square pressing diaphragm synthesis 100-600 micron thickness, obtain the first matrix 11,
3rd step: make intermediate layer 12, be specially: adopt the diaphragm of 10-80 micron thickness as dielectric layer 121, dielectric layer 121 punches to it by the shape of setting through hole A, then the dielectric layer 121 first had openning hole in stacked 1st layer of described individual layer on the first matrix 11, the described metal magnetic slurry obtained in through hole A place print steps one forms packed layer 122, wherein, the thickness of described along the vertical direction packed layer 122 is 1.05 times of the thickness of described dielectric layer 121, namely the lower surface of described packed layer 122 and the lower surface of described dielectric layer 121 in the same plane, its upper surface is a little more than the upper surface of described dielectric layer 121, then the coil electrode 123 drawing hole B with conduction is printed, the upper surface that described coil electrode 123 is arranged on described dielectric layer 121 is arranged in the surrounding (coil electrode 123 contacts with packed layer 122) (the 1st layer of described individual layer, can determine whether according to the actual requirements will through hole A place printing points electrode C on described dielectric layer) of described packed layer 122,
The dielectric layer 121 that the dielectric layer 121 of the 1st layer of individual layer first has openning hole in stacked 2nd layer of individual layer, the described metal magnetic slurry obtained in through hole A place print steps one forms packed layer 122, wherein, the thickness of described along the vertical direction packed layer 122 is identical with the thickness of the dielectric layer 121 of described 2nd layer of individual layer, namely the upper surface of packed layer 122 and the upper surface of described dielectric layer 121 in the same plane, described packed layer 122 is realized by metal magnetic slurry described in continuous printing step one; Then B corresponding setting in hole is drawn at described through hole A place printing points electrode C, described point electrode C with the described conduction on the 1st layer of individual layer dielectric layer 121; Finally print and draw the coil electrode 123 of hole B with conduction, the upper surface that described coil electrode 123 is arranged on the dielectric layer 121 of the 2nd layer of described individual layer is positioned at the surrounding (coil electrode 123 contacts with packed layer 122) of described packed layer 122;
The dielectric layer 121 that the dielectric layer 121 of the 2nd layer of individual layer first has openning hole in stacked 3rd layer of individual layer, the described metal magnetic slurry obtained in through hole A place print steps one forms packed layer 122, wherein, the thickness of described along the vertical direction packed layer 122 is identical with the thickness of described dielectric layer 121, namely the upper surface of packed layer 122 and the upper surface of described dielectric layer 121 in the same plane; Then B corresponding setting in hole is drawn at described through hole A place printing points electrode C, described point electrode C with the described conduction on the 2nd layer of individual layer dielectric layer 121; Finally print and draw the coil electrode 123 of hole B with conduction, the upper surface that described coil electrode 123 is arranged on the dielectric layer 121 of the 3rd layer of described individual layer is positioned at the surrounding (coil electrode 123 contacts with packed layer 122) of described packed layer 122;
4th step: make the second matrix 13, be specially: on the intermediate layer 12 that step 3 obtains, stacked diaphragm obtains the second matrix 13, the preparation method of wherein said second matrix 13 and structure are all identical with the preparation method of the first matrix 11 described in described step 2 and structure;
5th step: finished product, be specially: the crude product with the first matrix 11, intermediate layer 12 and the second matrix 13 step 4 obtained, through overbaking cutting, binder removal sintering chamfering, end-blocking, surface treatment, test process, obtains the finished product of the laminated inductor based on metal magnetic slurry.
Apply preparation method of the present invention, the present invention adopts LTCC dry method or wet-dry change technique, and processing step is simplified, whole stable production process, low, the very applicable large-scale mass production of high efficiency, cost.
The finished product of the laminated inductor based on metal magnetic slurry that the present embodiment 1 obtains is detected, and contrasts the electrical performance data of existing laminated inductor, refer to table 1:
The Performance comparision table of laminated inductor in the laminated inductor of table 1 embodiment 1 and prior art
As can be seen from Table 1: under equal conditions, rated current is 10 times of laminated inductor in prior art to the embodiment of the present invention 1 gained laminated inductor, and D.C. resistance is 25% of laminated inductor in prior art.
Embodiment 2:
Based on a laminated inductor for metal magnetic slurry, difference from Example 1 is only: the formula of (1) described packed layer 122 is different; (2) preparation method is different.
Packed layer 122 described in packed layer 122 described in the present embodiment comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 7 parts, lead-free glass powder 1 part, organic carrier 1 part and auxiliary agent 1 part.Described lead-free glass powder comprises the following material with weight parts: lithia 2 parts, potassium oxide 2 parts, diboron trioxide 15 parts, bismuth oxide 15 parts and silicon dioxide 45 parts.Described organic carrier comprises the following material with weight parts: butyl carbitol 15 parts, terpinol 5 parts and ethyl cellulose 3 parts.Described auxiliary agent comprises the following material with weight parts: triethanolamine 1 part, triethylene glycol two tricaprylate 1 part, polyamide wax 2 parts and γ-methacryloxypropyl trimethoxy silane 2 parts.
Preparation method's difference from preparation of Example 1 of the present embodiment is:
1, in the described first step, metal magnetic slurry viscosity when temperature 25 DEG C is 90Pas;
2, in the plane parallel with the upper surface of described dielectric layer 121, the shape of described through hole is circular.
The finished product of the laminated inductor based on metal magnetic slurry that the present embodiment 2 obtains is detected, and contrasts the electrical performance data of existing laminated inductor, refer to table 2:
The Performance comparision table of laminated inductor in the laminated inductor of table 2 embodiment 2 and prior art
As can be seen from Table 2: under equal conditions, rated current is 20 times of laminated inductor in prior art to the embodiment of the present invention 2 gained laminated inductor, and D.C. resistance is 26% of laminated inductor in prior art.
Embodiment 3:
Based on a laminated inductor for metal magnetic slurry, difference from Example 1 is only: the formula of (1) described packed layer 122 is different; (2) preparation method is different.
Packed layer 122 described in packed layer 122 described in the present embodiment comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 7 parts, lead-free glass powder 1 part, organic carrier 1.5 parts and auxiliary agent 1.5 parts.Described lead-free glass powder comprises the following material with weight parts: lithia 3 parts, potassium oxide 3 parts, diboron trioxide 20 parts, bismuth oxide 20 parts and silicon dioxide 40 parts.Described organic carrier comprises the following material with weight parts: butyl carbitol 10 parts, terpinol 15 parts and binding agent 2 parts.Described auxiliary agent comprises the following material with weight parts: triethanolamine 2 parts, triethylene glycol two tricaprylate 2 parts, polyamide wax 1 part and γ-methacryloxypropyl trimethoxy silane 2 parts.
Preparation method's difference from preparation of Example 1 of the present embodiment is:
1, in the described first step, metal magnetic slurry viscosity when temperature 25 DEG C is 100Pas;
2, in the plane parallel with the upper surface of described dielectric layer 121, the shape of described through hole is triangle.
The finished product of the laminated inductor based on metal magnetic slurry that the present embodiment 3 obtains is detected, and contrasts the electrical performance data of existing laminated inductor, refer to table 3:
The Performance comparision table of laminated inductor in the laminated inductor of table 3 embodiment 3 and prior art
As can be seen from Table 3: under equal conditions, rated current is 6.7 times of laminated inductor in prior art to the embodiment of the present invention 3 gained laminated inductor, and D.C. resistance is 21% of laminated inductor in prior art.
Embodiment 4:
Based on a laminated inductor for metal magnetic slurry, difference from Example 1 is only: the formula of (1) described packed layer 122 is different; (2) preparation method is different.
Packed layer 122 described in packed layer 122 described in the present embodiment comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 8 parts, lead-free glass powder 1 part, organic carrier 2 parts and auxiliary agent 2 parts.Described lead-free glass powder comprises the following material with weight parts: lithia 5 parts, potassium oxide 5 parts, diboron trioxide 25 parts, bismuth oxide 25 parts and silicon dioxide 35 parts.Described organic carrier comprises the following material with weight parts: butyl carbitol 5 parts, terpinol 15 parts and binding agent 1 part.Described auxiliary agent comprises the following material with weight parts: triethanolamine 2 parts, triethylene glycol two tricaprylate 2 parts, polyamide wax 1 part and γ-methacryloxypropyl trimethoxy silane 1 part.
Preparation method's difference from preparation of Example 1 of the present embodiment is:
1, in the described first step, metal magnetic slurry viscosity when temperature 25 DEG C is 120Pas;
2, in the plane parallel with the upper surface of described dielectric layer 121, the shape of described through hole is oval.
The finished product of the laminated inductor based on metal magnetic slurry that the present embodiment 4 obtains is detected, and contrasts the electrical performance data of existing laminated inductor, refer to table 4:
The Performance comparision table of laminated inductor in the laminated inductor of table 4 embodiment 4 and prior art
As can be seen from Table 4: under equal conditions, rated current is 9.3 times of laminated inductor in prior art to the embodiment of the present invention 4 gained laminated inductor, and D.C. resistance is 29% of laminated inductor in prior art.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the laminated inductor based on metal magnetic slurry, it is characterized in that: comprise arrange from the bottom to top the first matrix (11), intermediate layer (12) and the second matrix (13), described intermediate layer (12) comprise at least 2 layers of individual layer arranged from the bottom to top;
Described individual layer comprises dielectric layer (121), packed layer (122) and coil electrode (123), and described dielectric layer (121) is provided with through hole (A) along the vertical direction; Described packed layer (122) is arranged on described through hole (A) place, and the upper surface of described packed layer (122) is not less than the upper surface of described dielectric layer (121); The thickness of described along the vertical direction packed layer (122) is 1.0-1.5 times of the thickness of described dielectric layer (121); The upper surface that described coil electrode (123) is arranged on described dielectric layer (121) is positioned at the surrounding of described packed layer (122), and described coil electrode (123) is provided with conduction draws hole (B); The dielectric layer (121) of (n+1)th layer of described individual layer is provided with and draws the corresponding point electrode (C) in hole (B) with the conduction of individual layer described in n-th layer, n be more than or equal to 1 natural number;
Described packed layer (122) comprises the following material with weight parts: the inorganic particle 6-8 part be made up of metallic magnetic powder, lead-free glass powder 1-2 part, organic carrier 1-2 part and auxiliary agent 1-2 part.
2. the laminated inductor based on metal magnetic slurry according to claim 1, is characterized in that: on the upper surface of described dielectric layer (121), the shape of described through hole (A) is circle, triangle, ellipse or quadrangle; Described through hole (A) is arranged on the centre of described dielectric layer (121); The thickness of described along the vertical direction packed layer (122) is 1.0-1.2 times of the thickness of described dielectric layer (121).
3. the laminated inductor based on metal magnetic slurry according to claim 1, is characterized in that: the material of described first matrix (11), the second matrix (13) and dielectric layer (121) all adopts initial permeability to be the nickel-zinc-ferrite material of 300 ~ 600H/m.
4. the laminated inductor based on metal magnetic slurry according to claim 1, is characterized in that: described inorganic particle comprises at least one in sendust, iron-nickel alloy, ferro-silicium, carbonyl iron dust and molybdenum permalloy; Described lead-free glass powder comprises the following material with weight parts: lithia 1-5 part, potassium oxide 1-5 part, diboron trioxide 10-25 part, bismuth oxide 10-25 part and silicon dioxide 35-55 part; Described organic carrier comprises the following material with weight parts: high boiling solvent 10-25 part and binding agent 1-5 part; Described auxiliary agent comprises the following material with weight parts: dispersant 1-5 part, plasticizer 1-2 part, thixotropic agent 1-2 part and coupling agent 1-2 part.
5. the laminated inductor based on metal magnetic slurry according to claim 4, is characterized in that: described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part.
6. the laminated inductor based on metal magnetic slurry according to claim 4, is characterized in that: described high boiling solvent comprises at least one in butyl carbitol, terpinol, butyl carbitol acetate and turpentine oil; Described binding agent comprises at least one in ethyl cellulose, hydroxylated cellulose and polyvinyl butyral resin.
7. the laminated inductor based on metal magnetic slurry according to claim 6, is characterized in that:
Described packed layer (122) comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 6 parts, lead-free glass powder 2 parts, organic carrier 1 part and auxiliary agent 1 part; Described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 1 part, potassium oxide 1 part, diboron trioxide 10 parts, bismuth oxide 10 parts and silicon dioxide 35 parts; Described organic carrier comprises the following material with weight parts: butyl carbitol 10 parts, terpinol 10 parts and hydroxylated cellulose 5 parts; Described auxiliary agent comprises the following material with weight parts: triethanolamine 1 part, triethylene glycol two tricaprylate 1 part and polyamide wax 2 parts and γ-methacryloxypropyl trimethoxy silane 1 part;
Or described packed layer (122) comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 7 parts, lead-free glass powder 1 part, organic carrier 1 part and auxiliary agent 1 part; Described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 2 parts, potassium oxide 2 parts, diboron trioxide 15 parts, bismuth oxide 15 parts and silicon dioxide 45 parts; Described organic carrier comprises the following material with weight parts: butyl carbitol 15 parts, terpinol 5 parts and ethyl cellulose 3 parts; Described auxiliary agent comprises the following material with weight parts: triethanolamine 1 part, triethylene glycol two tricaprylate 1 part, polyamide wax 2 parts and γ-methacryloxypropyl trimethoxy silane 2 parts;
Or described packed layer (122) comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 7 parts, lead-free glass powder 1 part, organic carrier 1.5 parts and auxiliary agent 1.5 parts; Described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 3 parts, potassium oxide 3 parts, diboron trioxide 20 parts, bismuth oxide 20 parts and silicon dioxide 40 parts; Described organic carrier comprises the following material with weight parts: butyl carbitol 10 parts, terpinol 15 parts and binding agent 2 parts; Described auxiliary agent comprises the following material with weight parts: triethanolamine 2 parts, triethylene glycol two tricaprylate 2 parts, polyamide wax 1 part and γ-methacryloxypropyl trimethoxy silane 2 parts;
Or described packed layer (122) comprises the following material with weight parts: the inorganic particle be made up of metallic magnetic powder 8 parts, lead-free glass powder 1 part, organic carrier 2 parts and auxiliary agent 2 parts; Described inorganic particle comprises the following material with weight parts: sendust 3 parts, iron-nickel alloy 2 parts and carbonyl iron dust 1 part; Described lead-free glass powder comprises the following material with weight parts: lithia 5 parts, potassium oxide 5 parts, diboron trioxide 25 parts, bismuth oxide 25 parts and silicon dioxide 35 parts; Described organic carrier comprises the following material with weight parts: butyl carbitol 5 parts, terpinol 15 parts and binding agent 1 part; Described auxiliary agent comprises the following material with weight parts: triethanolamine 2 parts, triethylene glycol two tricaprylate 2 parts, polyamide wax 1 part and γ-methacryloxypropyl trimethoxy silane 1 part.
8. a preparation method for the laminated inductor based on metal magnetic slurry as described in claim 1-7 any one, is characterized in that: comprise the following steps:
Step one: prepare metal magnetic slurry, be specially: inorganic particle, lead-free glass powder, organic carrier and auxiliary agent are mixed according to proportioning, and obtain metal magnetic slurry after grinding with three-roll grinder, wherein, described metal magnetic slurry viscosity when temperature 25 DEG C is 100 ± 20Pas;
Step 2: make the first matrix (11), be specially: adopt LTCC dry method or dry jet wet spinning technique that nickel-zinc ferrite slurry curtain coating is obtained the first matrix (11);
Step 3: the first matrix (11) obtained in step 2 makes intermediate layer (12), be specially: in the upper shape by setting through hole (A) of the dielectric layer (121) of the 1st layer of individual layer, it is punched, described through hole (A) is arranged along the vertical direction, then the dielectric layer (121) first had openning hole in the upper stacked 1st layer of individual layer of the first matrix (11), the described metal magnetic slurry obtained in through hole (A) place print steps one forms packed layer (122), wherein, the thickness of described along the vertical direction packed layer (122) is 1.0-1.5 times of the thickness of described dielectric layer (121), then print the coil electrode (123) drawing hole (B) with conduction, the upper surface that described coil electrode (123) is arranged on described dielectric layer (121) is positioned at the surrounding of described packed layer (122),
The dielectric layer (121) first had openning hole in the upper stacked (n+1)th layer of individual layer of the dielectric layer (121) of n-th layer individual layer, wherein n be more than or equal to 1 natural number; The described metal magnetic slurry obtained in through hole (A) place print steps one forms packed layer (122), wherein, the thickness of described along the vertical direction packed layer (122) is 1.0-1.5 times of the thickness of described dielectric layer (121); Then at described through hole (A) place printing points electrode (C); Finally print the coil electrode (123) drawing hole (B) with conduction, the upper surface that described coil electrode (123) is arranged on the dielectric layer (121) of (n+1)th layer of individual layer is positioned at the surrounding of described packed layer (122), and wherein said conduction draws hole (B) and described point electrode (C) the corresponding setting on n-th layer individual layer dielectric layer (121);
Step 4: make the second matrix (13), be specially: upper stacked diaphragm obtains the second matrix (13) in the intermediate layer that step 3 obtains (12);
Step 5: finished product, be specially: the crude product with the first matrix (11), intermediate layer (12) and the second matrix (13) step 4 obtained, through overbaking cutting, binder removal sintering chamfering, end-blocking, surface treatment, test process, obtains the finished product of the laminated inductor based on metal magnetic slurry.
9. the preparation method of the laminated inductor based on metal magnetic slurry according to claim 8, is characterized in that: described packed layer (122) is realized by metal magnetic slurry described in continuous printing step one.
10. the preparation method of the laminated inductor based on metal magnetic slurry according to claim 8, is characterized in that: the concrete technology that in described step one, three-roll grinder carries out grinding is: adopt slow roller rotating speed 32rpm/min, central roll rotating speed 89rpm/min and fast roller rotating speed 250rpm/min simultaneous grinding 4-10 hour; The concrete preparation process of described first matrix (11) is: nickel-zinc-ferrite material, organic solvent, organic carrier are configured to nickel-zinc ferrite slurry through ball milling, then nickel-zinc ferrite slurry curtain coating becomes the diaphragm of 10-80 micron thickness, cut into the square diaphragm that Length x Width is 125 millimeters, by square pressing diaphragm synthesis 100-600 micron thickness, obtain the first matrix (11); The diaphragm that dielectric layer (121) in described step 3 is 10-80 micron thickness; The preparation method of the second matrix (13) in described 4th step and structure are all identical with the preparation method of the first matrix described in described step 2 (11) and structure.
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| CN112038041A (en) * | 2019-06-03 | 2020-12-04 | 株式会社村田制作所 | Laminated coil component |
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