WO2013035516A1 - 積層型コイル部品 - Google Patents
積層型コイル部品 Download PDFInfo
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- WO2013035516A1 WO2013035516A1 PCT/JP2012/070996 JP2012070996W WO2013035516A1 WO 2013035516 A1 WO2013035516 A1 WO 2013035516A1 JP 2012070996 W JP2012070996 W JP 2012070996W WO 2013035516 A1 WO2013035516 A1 WO 2013035516A1
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- Prior art keywords
- coil
- conductor
- weight
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- 239000004020 conductor Substances 0.000 claims abstract description 127
- 239000002245 particle Substances 0.000 claims abstract description 39
- 239000010410 layer Substances 0.000 claims description 96
- 238000010304 firing Methods 0.000 claims description 34
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 13
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 10
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 9
- 239000002241 glass-ceramic Substances 0.000 claims description 9
- 229910052700 potassium Inorganic materials 0.000 claims description 9
- 239000011591 potassium Substances 0.000 claims description 9
- 239000011247 coating layer Substances 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 abstract description 23
- 238000002844 melting Methods 0.000 abstract description 13
- 230000008018 melting Effects 0.000 abstract description 13
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 238000005245 sintering Methods 0.000 abstract description 5
- 239000000919 ceramic Substances 0.000 description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 10
- 239000001856 Ethyl cellulose Substances 0.000 description 8
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 8
- 229920001249 ethyl cellulose Polymers 0.000 description 8
- 235000019325 ethyl cellulose Nutrition 0.000 description 8
- 239000002904 solvent Substances 0.000 description 8
- 238000004804 winding Methods 0.000 description 7
- 239000005388 borosilicate glass Substances 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 235000012239 silicon dioxide Nutrition 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010453 quartz Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000004110 Zinc silicate Substances 0.000 description 2
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000000027 scanning ion microscopy Methods 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 235000019352 zinc silicate Nutrition 0.000 description 2
- XSMMCTCMFDWXIX-UHFFFAOYSA-N zinc silicate Chemical compound [Zn+2].[O-][Si]([O-])=O XSMMCTCMFDWXIX-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002003 electrode paste Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/003—Printed circuit coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
-
- 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
- H01F41/02—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 for manufacturing cores, coils, or magnets
- H01F41/04—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 for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/041—Printed circuit coils
- H01F41/042—Printed circuit coils by thin film techniques
Definitions
- the present invention relates to a multilayer coil component.
- Patent Document 1 As a conventional multilayer coil component, for example, one described in Patent Document 1 is known.
- a coil conductor is formed on a glass ceramic sheet, the sheets are laminated, the coil conductors in each sheet are electrically connected, and the coil portion is placed inside by firing.
- the formed element body is formed.
- external electrode portions electrically connected to the end portions of the coil portions are formed on both end faces of the element body.
- the multilayer coil component has a lower Q (quality factor) value than a wound coil wound with a wire due to reasons such as its structure and manufacturing method.
- Q quality factor
- the recent demand for components that can cope with high frequencies in particular high Q values are also required for laminated coil components.
- Conventional multilayer coil components have not been able to realize a high Q value until such a requirement is satisfied.
- the present invention has been made to solve such a problem, and an object of the present invention is to provide a laminated coil component capable of obtaining a high Q value.
- the present inventors have found that in order to increase the smoothness of the surface of the coil conductor and increase the Q value, it is preferable to set the particle diameter of the conductor after firing within a predetermined range. It was.
- the present inventors can reduce the surface roughness of the coil conductor to such an extent that a sufficient Q value can be obtained at a high frequency by setting the particle diameter of the coil conductor after firing to 10 ⁇ m or more. I found.
- the inventors of the present invention if the particle diameter of the coil conductor after firing is made too large, the melting of the metal of the coil conductor proceeds rapidly during firing. It has been found that retraction will occur. Therefore, the present inventors have found that rapid melting of the metal of the coil conductor can be suppressed by setting the particle diameter of the coil conductor after firing to 22 ⁇ m or less.
- the multilayer coil component according to the present invention includes an element body formed by laminating a plurality of insulator layers, and a coil portion formed inside the element body by a plurality of coil conductors, and fired.
- the particle diameter of the subsequent coil conductor is 10 ⁇ m to 22 ⁇ m.
- the surface roughness of the coil conductor can be reduced to such an extent that a sufficient Q value can be obtained at a high frequency by setting the particle diameter of the fired coil conductor to 10 ⁇ m or more. Moreover, it can suppress that the metal of a coil conductor melt
- the element body may be made of glass ceramic. Thereby, the dielectric constant of the element body can be reduced, and the Q value can be increased.
- the glass ceramic may contain 86.7 to 92.5% by weight of SiO 2 and 0.5 to 2.4% by weight of Al 2 O 3 .
- a potassium coating layer covering the coil conductor may be formed.
- the softening point of the element body around the coil conductor can be lowered, and the element body in the region softens and becomes smooth during firing. Accordingly, the surface of the coil conductor in contact therewith can also be smoothed.
- the particle diameter of the coil conductor after firing may be 11 ⁇ m to 18 ⁇ m.
- rapid melting of the metal of the coil conductor can be further suppressed, and the surface roughness of the coil conductor can be further reduced.
- the Q value of the multilayer coil component can be increased.
- FIG. 1 is a cross-sectional view showing a multilayer coil component according to an embodiment.
- FIG. 2 is a cross-sectional view showing the multilayer coil component according to the embodiment.
- FIG. 3 is a schematic diagram showing the relationship between the surface smoothness of the coil conductor and the surface resistance.
- FIG. 4 is a schematic diagram showing the state of the element body during firing when the softening point of the coil portion arrangement layer is low and with or without the shape retaining layer.
- FIG. 5 is a schematic diagram showing the relationship between the state of the element body and the smoothness of the surface of the coil conductor.
- FIG. 6 is a graph showing the relationship between the conductor particle diameter and the surface roughness of the coil conductor of the multilayer coil component according to the example.
- FIG. 7 is a table showing various conditions of the multilayer coil component according to the example.
- FIG. 8 is a graph showing the relationship between the frequency and the AC resistance value for the selected laminated coil component.
- FIG. 9 is a photograph showing a cross section of the coil conductor of the selected laminated coil component.
- FIG. 10 is a graph showing the relationship between the frequency and the Q value for the selected laminated coil component.
- FIGS. 1 and 2 are cross-sectional views showing the laminated coil component according to the present embodiment.
- the laminated coil component 1 is formed inside the element body 2 by an element body 2 formed by laminating a plurality of insulator layers and a plurality of coil conductors 4 and 5. And a pair of external electrodes 6 formed on both end faces of the element body 2.
- the element body 2 is a rectangular parallelepiped or cubic laminated body made of a sintered body in which a plurality of ceramic green sheets are laminated.
- the element body 2 includes a coil part arrangement layer 2A in which the coil part 3 is arranged, and a shape retaining layer 2B provided in a pair so as to sandwich the coil part arrangement layer 2A.
- the coil portion arrangement layer 2A is not particularly limited as long as the particle diameter of the coil conductor 4 can be within a predetermined range, but is preferably made of glass ceramics, for example. As a result, the dielectric constant of the element body 2 can be reduced, and the Q value can be increased.
- the coil portion arrangement layer 2A is preferably made of amorphous ceramics. Thereby, the smoothness of the coil conductors 4 and 5 can be improved. Moreover, it is preferable that 2 A of coil part arrangement
- the coil unit arrangement layer 2A preferably contains an Al 2 O 3. Thereby, the crystal transition in the coil portion arrangement layer 2A can be prevented.
- the coil portion arrangement layer 2 ⁇ / b > A preferably contains K 2 O in order to form the covering layer 7 that covers the coil conductors 4 and 5.
- the coil portion arrangement layer 2A contains 35-60% by weight of a borosilicate glass component as a main component, 15-35% by weight of a quartz component, an amorphous silica component in the balance, and alumina as a subcomponent.
- the content of alumina is 0.5 to 2.5% by weight with respect to 100% by weight of the main component.
- the coil portion arrangement layer 2A has a SiO 2 content of 86.7 to 92.5% by weight, a B 2 O 3 content of 6.2 to 10.7% by weight, and a K 2 O content of 0.7 to 1. 0.2% by weight and Al 2 O 3 has a composition of 0.5 to 2.4% by weight.
- the glass ceramic contains 86.7 to 92.5 wt% of SiO 2 and 0.5 to 2.4 wt% of Al 2 O 3 , the surface smoothness of the coil conductors 4 and 5 is further improved. Can be improved. In addition, you may contain 1.0 weight% or less of MgO and CaO.
- the coil portion arrangement layer 2A contains, as main components, 35 to 75% by weight of a borosilicate glass component, 5 to 40% by weight of a quartz component, and 5 to 60% by weight of a zinc silicate component.
- the element body 2 when it is configured to have the shape retaining layer 2B, the element body 2 is preferably configured as follows. That is, the shape-retaining layer 2B is formed so as to cover the entire end face 2a and end face 2b facing each other in the stacking direction among the end faces of the coil portion arrangement layer 2A.
- the shape retaining layer 2B has a function of maintaining the shape of the coil portion arrangement layer 2A during sintering.
- the thickness of the coil portion arrangement layer 2A in the stacking direction is, for example, 0.1 mm or more, and the thickness of the shape retaining layer 2B in the stacking direction is 5 ⁇ m or more.
- the coil portion arrangement layer 2A contains 35-60% by weight of a borosilicate glass component as a main component, 15-35% by weight of a quartz component, and amorphous silica in the balance. Ingredients are contained, and alumina is contained as a sub-component, and the content of alumina is 0.5 to 2.5% by weight with respect to 100% by weight of the main component.
- the coil portion arrangement layer 2A has, after firing, 86.7 to 92.5 wt% of SiO 2 , 6.2 to 10.7 wt% of (B 2 O 3 ), and 0.7 of K 2 O. Has a composition of ⁇ 1.2 wt% and Al 2 O 3 of 0.5 to 2.4 wt%.
- the dielectric constant of the coil part arrangement layer 2A can be reduced. Further, when the coil part arrangement layer 2A contains 0.5 to 2.4% by weight of Al 2 O 3 , crystal transition in the coil part arrangement layer 2A can be prevented. In addition, you may contain 1.0 weight% or less of MgO and CaO.
- the shape-retaining layer 2B contains 50 to 70% by weight of a glass component and 30 to 50% by weight of an alumina component as main components. Further, the shape-retaining layer 2B, after firing, is 23 to 42% by weight of SiO 2 , 0.25 to 3.5% by weight of B 2 O 3 , and 34.2 to 58.8% by weight of Al 2 O 3.
- the alkaline earth metal oxide has a composition of 12.5 to 31.5% by weight, and 60% by weight or more in the alkaline earth metal oxide (that is, 7.5 to 31.5% of the entire shape retaining layer 2B). % By weight) is SrO.
- the softening point of the coil portion arrangement layer 2A is set lower than the softening point or melting point of the shape retaining layer 2B.
- the softening point of the coil portion arrangement layer 2A is 800 to 1050 ° C.
- the softening point or melting point of the shape-retaining layer 2B is 1200 ° C. or more.
- the coil part arrangement layer 2A can be made amorphous by lowering the softening point of the coil part arrangement layer 2A. By increasing the softening point or melting point of the shape retention layer 2B, the shape can be maintained so that the coil portion arrangement layer 2A having a low softening point does not deform during firing.
- the coil portion arrangement layer 2A does not contain SrO.
- SrO hardly diffuses, it is suppressed that SrO of the shape retaining layer 2B diffuses into the coil portion arrangement layer 2A during firing.
- the coil portion arrangement layer 2A does not contain SrO, relatively low dielectric constant SiO 2 can be increased, and thereby the dielectric constant can be lowered. Therefore, the Q (quality factor) value of the coil can be increased.
- the shape retaining layer 2B contains SrO, the content of SiO 2 is less than that of the coil portion arrangement layer 2A, and the dielectric constant is increased. 5 is not included and does not affect the Q value of the coil.
- the coil unit arrangement layer 2A is less high intensity content of SiO 2
- Hokatachiso 2B is a high strength low content of SiO 2. That is, the shape retaining layer 2B can also function as a reinforcing layer of the coil portion arranging layer 2A after firing.
- the element body is crystalline, the surface of the coil conductor in contact with the element body may be uneven due to the influence of the unevenness on the surface of the element body.
- the element body is more preferable that the element body is amorphous because the surface of the coil conductor in contact with the element body is smooth due to the influence of the smooth surface of the element body. That is, the element body is more preferably amorphous.
- the element body is not completely amorphous, and a part of the crystalline material is contained by a small amount (0.5 to 2.4% by weight) of the alumina component.
- the coil portion arrangement layer 2A having a lowered softening point is Since it is sandwiched between the shape-retaining layers 2B, the shape is maintained without being rounded during firing.
- the element body is not limited to being amorphous, and may be crystalline as long as a desired coil conductor particle size can be obtained.
- the coil part 3 has a coil conductor 4 related to the winding part and a coil conductor 5 related to the lead part connected to the external electrode 6.
- the coil conductors 4 and 5 are formed of a conductor paste containing, for example, one of silver, copper, and nickel as a main component.
- the coil part 3 is arranged only inside the coil part arrangement layer 2A, and is not arranged in the shape retaining layer 2B. Further, none of the coil conductors 4 and 5 of the coil portion 3 is in contact with the shape retaining layer 2B.
- Both end portions of the coil portion 3 in the stacking direction are separated from the shape retaining layer 2B, and the ceramic of the coil portion arrangement layer 2A is disposed between the coil portion 3 and the shape retaining layer 2B.
- the coil conductor 4 related to the winding portion is configured by forming a conductor pattern of a predetermined winding with a conductor paste on the ceramic green sheet forming the coil portion arrangement layer 2A.
- the conductor patterns of each layer are connected in the stacking direction by through-hole conductors.
- the coil conductor 5 relating to the lead-out portion is configured by a conductor pattern that pulls the end of the winding pattern to the external electrode 6.
- the coil pattern of the winding part, the number of windings, the drawing position of the drawing part, etc. are not particularly limited.
- a K (potassium) coating layer 7 covering the coil conductors 4 and 5 is formed.
- the covering layer 7 is formed by allowing potassium to be collected around the coil conductors 4 and 5 during firing by adding potassium to the ceramic green sheet before firing that forms the coil portion arrangement layer 2A.
- the particle size after firing of the coil conductors 4 and 5 is preferably 10 ⁇ m to 22 ⁇ m, and more preferably 11 ⁇ m to 18 ⁇ m. It is preferable to reduce the surface roughness of the coil conductors 4 and 5 in order to reduce the surface resistance. By making the particle diameters of the coil conductors 4 and 5 10 ⁇ m or more, the surface roughness can be reduced and the Q value can be increased at a high frequency. In addition, by setting the particle diameter of the coil conductors 4 and 5 to 22 ⁇ m or less, it is possible to suppress the occurrence of disconnection or pull-in of the lead-out portion due to melting of the metal (for example, silver) constituting the coil conductors 4 and 5 it can.
- the metal for example, silver
- the pair of external electrodes 6 are formed so as to cover both end faces facing each other in the direction orthogonal to the stacking direction, among the end faces of the element body 2.
- Each external electrode 6 may be formed so as to cover the entire both end surfaces, and a part may wrap around from the both end surfaces to the other four surfaces.
- Each external electrode 6 is formed, for example, by screen-printing a conductor paste mainly composed of one of silver, copper, and nickel, or by using a printing and dipping method.
- a ceramic green sheet for forming the coil portion arrangement layer 2A is prepared.
- Each ceramic green sheet is prepared by adjusting a ceramic paste so as to have the above-described composition and molding the sheet by a doctor blade method or the like.
- a ceramic green sheet for forming the shape retaining layer 2B is also prepared.
- the conductive paste contains a conductor powder mainly composed of silver, nickel or copper having a predetermined particle size characteristic. Specifically, conductor powder having an average particle diameter of 1 ⁇ m to 3 ⁇ m and a standard deviation of 0.7 ⁇ m to 1.0 ⁇ m is used. In addition, classification may be performed to obtain a conductor powder having such particle size characteristics.
- each conductor pattern is formed on each ceramic green sheet to be the coil portion arrangement layer 2A.
- each conductor pattern and each through-hole electrode are formed by screen printing using a conductive paste containing silver or nickel.
- each ceramic green sheet is laminated.
- the ceramic green sheets to be the coil portion arranging layer 2A are stacked on the ceramic green sheets to be the shape retaining layer 2B, and the ceramic green sheets to be the shape retaining layer 2B are stacked thereon.
- the shape-retaining layer 2B formed on the bottom and the top may be formed by a single ceramic green sheet or a plurality of ceramic green sheets.
- pressure is applied in the stacking direction to pressure-bond each ceramic green sheet.
- the laminated body is baked, for example, at 900 to 940 ° C. for 10 to 60 minutes to form the element body 2.
- the firing condition is adjusted by setting the target particle size of the coil conductor to 10 ⁇ m to 22 ⁇ m.
- the firing temperature is set to be equal to or higher than the softening point of the coil portion arrangement layer 2A and lower than the softening point or melting point of the shape retaining layer 2B.
- the shape retention layer 2B maintains the shape of the coil portion arrangement layer 2A.
- an external electrode 6 is formed on the element body 2.
- the laminated coil component 1 is formed.
- the external electrode 6 is formed by applying an electrode paste mainly composed of silver, nickel or copper to both end faces in the longitudinal direction of the element body 2 and baking it at a predetermined temperature (for example, about 600 to 700 ° C.). It is formed by applying electroplating. For this electroplating, Cu, Ni, Sn, or the like can be used.
- Coil Q quality In order to increase the factor value, it is preferable to increase the smoothness of the surface of the coil conductor.
- the smoothness of the surface of the coil conductor affects the Q value.
- FIG. 3B when the smoothness of the surface of the coil conductor is low and irregularities are formed, the surface resistance of the coil conductor increases and the Q value of the coil decreases.
- the smoothness of the surface of the coil conductor is high as shown in FIG. 3A, the surface resistance of the coil conductor is lowered, and the Q value of the coil can be increased.
- the present inventors have found that the surface roughness of the coil conductor can be reduced to such an extent that a sufficient Q value can be obtained at a high frequency by setting the particle diameter of the fired coil conductor to 10 ⁇ m or more. It was.
- the inventors have increased the particle size of the coil conductor after firing by adjusting the firing conditions and the like, the melting of the metal of the coil conductor proceeds rapidly during firing, and as a result, It has been found that disconnection of the coil conductor and pull-in of the lead-out portion occur. Therefore, the present inventors have found that rapid melting of the metal of the coil conductor can be suppressed by setting the particle diameter of the coil conductor after firing to 22 ⁇ m or less.
- the particle diameters of the coil conductors 4 and 5 after firing are 10 ⁇ m to 22 ⁇ m.
- the surface roughness of the coil conductor can be reduced to such an extent that a sufficient Q value can be obtained at a high frequency.
- it can suppress that the metal of the coil conductors 4 and 5 melt
- a potassium coating layer 7 covering the coil conductors 4 and 5 is formed.
- the softening point of the element body 2 around the coil conductors 4 and 5 can be lowered, and the element body 2 in the region softens and becomes smooth during firing. It becomes easy.
- the surfaces of the coil conductors 4 and 5 in contact therewith can also be smoothed.
- the present invention is not limited to the embodiment described above.
- the laminated coil component having one coil part is illustrated, but for example, it may have a plurality of coil parts in an array.
- Multilayer coil components A-1 to A-7 (Group A), Multilayer coil components B-1 to B6 (Group B), and Multilayer coil components C-1 to C-5 (Group C) It produced and measured the relationship between the conductor particle size and surface roughness of the coil conductor of each laminated coil component. Further, the relationship between the surface roughness and the AC resistance value was measured, and the state of the coil conductor was observed.
- the group A laminated coil component has a structure in which the coil portion arrangement layer 2A is sandwiched between the shape retaining layers 2B as shown in FIG.
- composition of the ceramic paste forming the coil portion arrangement layer 2A of the multilayer coil components A-1 to A-7 is 66.1% by weight of the borosilicate glass component, 25.4% by weight of the quartz component, and the zinc silicate component. 8.5% by weight, 10% by weight of ethyl cellulose (binder), and 140% by weight of terpione (solvent).
- the composition of the ceramic paste forming the shape-retaining layer 2B of the laminated coil parts A-1 to A-7 is as follows: the glass component is 70% by weight, alumina is 30% by weight, ethyl cellulose (binder) is 10% by weight, Pioneer (solvent) is 140% by weight.
- the conductor paste for forming the coil conductors 4 and 5 of the laminated coil components A-1 to A-7 has Ag of 100% by weight, ethyl cellulose (binder) of 10% by weight, and terpionol (solvent) of 40% by weight. It is.
- the firing conditions were set to the conditions shown in the table of FIG.
- the substrate characteristics are amorphous and the electrode characteristics are easy grain growth.
- the group B laminated coil component has a structure in which the coil portion arrangement layer 2A is sandwiched between the shape retaining layers 2B as shown in FIG.
- the composition of the ceramic paste forming the coil portion arrangement layer 2A of the multilayer coil components B-1 to B-6 is 60% by weight of the borosilicate glass component, 20% by weight of the quartz component, 20% by weight of the amorphous silica component, Alumina is 1.5% by weight, ethylcellulose (binder) is 10% by weight, and terpionol (solvent) is 140% by weight.
- the composition of the ceramic paste forming the shape-retaining layer 2B of the laminated coil parts B-1 to B-6 is as follows: the glass component is 70% by weight, alumina is 30% by weight, ethyl cellulose (binder) is 10% by weight, Pioneer (solvent) is 140% by weight.
- the conductor paste forming the coil conductors 4 and 5 of the laminated coil components B-1 to B-6 has Ag of 100% by weight, ethylcellulose (binder) 10% by weight, and terpionol (solvent) 40% by weight. .
- the firing conditions were set to the conditions shown in the table of FIG.
- the substrate characteristics are amorphous and the electrode characteristics are easy grain growth.
- the laminated coil component of group C has a structure including only the coil portion arrangement layer 2A as shown in FIG.
- the composition of the ceramic paste forming the coil portion arrangement layer 2A of the laminated coil components C-1 to C-5 is as follows: the glass component is 70% by weight, alumina is 30% by weight, ethyl cellulose (binder) is 10% by weight, Terpionel (solvent) is 140% by weight.
- the conductor paste forming the coil conductors 4 and 5 of the laminated coil components C-1 to C-5 has 100% by weight of Ag, 10% by weight of ethyl cellulose (binder), and 40% by weight of terpioneel (solvent). .
- the firing conditions were set to the conditions shown in the table of FIG.
- the substrate characteristics are crystalline, and the electrode characteristics are difficult grain growth.
- the substrate characteristic is crystalline, and the electrode characteristic is easy grain growth.
- ⁇ Measurement of conductor particle size and surface roughness> For the laminated coil component as described above, the conductor particle size and the surface roughness were measured, and the relationship between the two was plotted on the graph shown in FIG. Regarding the conductor particle size, a SIM (Scanning Ion Microscopy) image of the conductor cross section was taken, the area of the particle was calculated by image analysis software, and the diameter of the area equivalent circle was taken as the conductor particle size.
- the surface roughness the height of the unevenness of the coil conductor and the width of the unevenness are measured for the boundary portion between the coil conductor and the element body in the conductor cross section, and the percentage of the height of the unevenness with respect to the width of the unevenness is obtained. 100 or more such irregularities were sampled and statistically processed, and the average value of the percentages was defined as the surface roughness.
- the laminated coil component C-1 having a surface roughness of about 8% (and A-1 and A-7 having a surface roughness smaller than that) is about 80% of the wound coil at 1 GHz. Can be obtained. In other words, if the surface roughness is 8% or less, it is understood that even if it is used in the same circuit in place of the winding coil, it is possible to obtain a level of performance that can sufficiently function. Further, according to FIG. 8, the laminated coil component C-2 having a surface roughness of about 18% has a high AC resistance value.
- the AC resistance value is further increased than that of the laminated coil component C-1. Had fallen.
- the AC resistance value can be lowered by setting the surface roughness to a sufficiently small value of 6% or less like the multilayer coil components A-1 and A-7. That is, the Q value can be improved.
- the conductor particle size is at least 10 ⁇ m, the surface roughness can be suppressed to a sufficiently small value of 6% or less, and a product with a high Q value can be obtained reliably. Is understood.
- the present invention can be used for laminated coil components.
- SYMBOLS 1 Multilayer coil component, 2 ... Element body, 2A ... Coil part arrangement layer, 2B ... Shape retention layer, 3 ... Coil part, 4, 5 ... Coil conductor, 6 ... External conductor.
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Abstract
Description
factor)値を上げるためには、コイル導体の表面の平滑性を上げることが好適である。周波数が高くなれば高くなるほど表皮深さが浅くなり、高周波の場合は、コイル導体の表面の平滑性がQ値に影響を与える。例えば、図3(b)に示すようにコイル導体の表面の平滑性が低く、凹凸が形成されていた場合、コイル導体の表面抵抗が上がり、コイルのQ値が下がってしまう。一方、図3(a)のようにコイル導体の表面の平滑性が高ければ、コイル導体の表面抵抗が下がり、コイルのQ値を上げることができる。
積層型コイル部品A-1~A-7(グループA)と、積層型コイル部品B-1~B6(グループB)と、積層型コイル部品C-1~C-5(グループC)と、を作製し、それぞれの積層型コイル部品のコイル導体の導体粒径と表面粗さの関係を測定した。また、表面粗さと交流抵抗値の関係を測定すると共に、コイル導体の状態を観察した。
グループAの積層型コイル部品は、図2に示すような、コイル部配置層2Aを保形層2Bで挟む構造である。
グループBの積層型コイル部品は、図2に示すような、コイル部配置層2Aを保形層2Bで挟む構造である。
グループCの積層型コイル部品は、図1に示すような、コイル部配置層2Aのみからなる構造である。
上述のような積層型コイル部品について、導体粒径と表面粗さの測定を行い、図6に示すグラフに両者の関係をプロットした。導体粒径については、導体断面のSIM(Scanning Ion Microscopy)像を撮影し、画像解析ソフトにより粒子の面積を算出し、面積相当円の直径を導体粒径とした。表面粗さについては、導体断面のうちコイル導体と素体との境界部分について、コイル導体の凹凸の高さと凹凸の幅を測定し、凹凸の幅に対する凹凸の高さの百分率を取得し、このような凹凸を100箇所以上サンプリングして統計処理し、当該百分率の平均値を表面粗さとした。
上述の積層型コイル部品のうち、図7の中から、積層型コイル部品A-1,A-7,C-1,C-2をピックアップし、交流抵抗値を測定した。各積層型コイル部品の導体周囲長は155μmで、単位μm当たりの交流抵抗値を測定した。測定結果を図8に示す。また、各積層型コイル部品の導体断面の写真を図9に示す。更に、図8に示す交流抵抗値からQ値を計算した結果を図10に示す。図10に示すように、表面粗さが約8%の積層型コイル部品C-1(及びそれより表面粗さが小さいA-1及びA-7)は、1GHzにおいて巻線コイルの80%程度のQ値を得ることができる。すなわち、表面粗さが8%以下であれば、巻線コイルの代わりに同じ回路で使用しても、充分に機能させることができるレベルの性能を得られることが理解される。また、図8によれば、表面粗さが約18%の積層型コイル部品C-2は、交流抵抗値が高くなっている。一方、表面粗さが約5%の積層型コイル部品A-7、及び表面粗さが約1%の積層型コイル部品A-1については、積層型コイル部品C-1よりさらに、交流抵抗値が低下していた。このように、積層型コイル部品A-1,A-7のように表面粗さを6%以下の十分に小さい値にすることで交流抵抗値を低下させることができる。すなわちQ値を向上させることができる。図6から理解されるように、少なくとも導体粒径が10μm以上であれば、表面粗さを6%以下の十分に小さい値に抑えられることができ、確実にQ値の高い製品を得られることが理解される。
次に、各積層型コイル部品について、コイル導体の状態を観察し、金属の融解による断線や、引出部の引込み等を観察した。この観察では、各条件について100個の積層型コイル部品をそれぞれ製造し、観察を行った。積層型コイル部品A1、A2については、100個中、100個の積層型コイル部品について断線等が確認された。一方、他の条件に係る積層型コイル部品については、100個中100個について、そのような断線等は観察されず良好な状態であることが確認された。この結果より、コイル導体の粒径が22μm以下であれば、コイル導体の融解が急激に進むことを抑制し、断線等を防止できることが理解される。
以上の結果より、コイル導体の粒径を10μm~22μmを目標粒径とすることで、高周波であっても高いQ値を得ることができると共に、断線等のない良好な状態の積層型コイル部品を得ることができることが理解される。
Claims (5)
- 複数の絶縁体層を積層することによって形成される素体と、
複数のコイル導体によって前記素体の内部に形成されるコイル部と、を備え、
焼成後の前記コイル導体の粒径が10μm~22μmである、積層型コイル部品。 - 前記素体は、ガラスセラミックからなる、請求項1記載の積層型コイル部品。
- 前記ガラスセラミックは、86.7~92.5重量%のSiO2と、0.5~2.4重量%のAl2O3を含有する、請求項2記載の積層型コイル部品。
- 前記コイル導体を覆うカリウムの被覆層が形成されている、請求項1~3のいずれか一項記載の積層型コイル部品。
- 焼成後の前記コイル導体の粒径が11μm~18μmである、請求項1~4のいずれか一項記載の積層型コイル部品。
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US10763031B2 (en) * | 2016-08-30 | 2020-09-01 | Samsung Electro-Mechanics Co., Ltd. | Method of manufacturing an inductor |
KR101963281B1 (ko) * | 2016-12-14 | 2019-03-28 | 삼성전기주식회사 | 인덕터 |
JP6260731B1 (ja) * | 2017-02-15 | 2018-01-17 | Tdk株式会社 | ガラスセラミックス焼結体およびコイル電子部品 |
CN108630380B (zh) * | 2017-03-16 | 2021-08-20 | Tdk株式会社 | 层叠线圈部件 |
JP6984212B2 (ja) * | 2017-07-28 | 2021-12-17 | Tdk株式会社 | コイル部品 |
JP6504241B1 (ja) * | 2017-12-27 | 2019-04-24 | Tdk株式会社 | ガラスセラミックス焼結体およびコイル電子部品 |
US20190311842A1 (en) * | 2018-04-09 | 2019-10-10 | Murata Manufacturing Co., Ltd. | Coil component |
KR102467254B1 (ko) | 2018-05-18 | 2022-11-14 | 주식회사 케이티 | 네트워크 스위치 장치와 가입자 단말 사이의 인터넷 속도를 예측하는 장치 및 방법 |
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JP7251243B2 (ja) * | 2019-03-22 | 2023-04-04 | Tdk株式会社 | 積層コイル部品 |
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US8952778B2 (en) | 2015-02-10 |
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