WO2022202039A1 - 電子部品 - Google Patents
電子部品 Download PDFInfo
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- WO2022202039A1 WO2022202039A1 PCT/JP2022/007004 JP2022007004W WO2022202039A1 WO 2022202039 A1 WO2022202039 A1 WO 2022202039A1 JP 2022007004 W JP2022007004 W JP 2022007004W WO 2022202039 A1 WO2022202039 A1 WO 2022202039A1
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- Prior art keywords
- glass layer
- potassium
- ceramic body
- zirconium
- titanium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/224—Housing; Encapsulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/23—Corrosion protection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
- H01G4/2325—Terminals electrically connecting two or more layers of a stacked or rolled capacitor characterised by the material of the terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/129—Ceramic dielectrics containing a glassy phase, e.g. glass ceramic
Definitions
- the present invention relates to an electronic component, and more particularly to an electronic component comprising a ceramic body and a glass layer partially covering the surface of the ceramic body.
- An electronic component including a ceramic body can have external electrodes on both sides of the ceramic body for mounting on a circuit board or the like.
- terminal electrodes are provided at both ends of a ceramic body (thermistor chip), and metal plating layers are formed on the surfaces of the terminal electrodes by electrolytic plating.
- the side surfaces of the ceramic body are covered with a high-resistance layer such as a glass layer.
- an object of the present invention is to provide an electronic component having a glass layer resistant to a plating solution.
- the ceramic body comprises a ceramic body, external electrodes provided on part of the surface of the ceramic body, and a glass layer covering at least part of the surface of the ceramic body.
- the glass layer contains silicon atoms, titanium atoms and zirconium atoms, and the glass layer has a titanium dispersion ratio of 90% or more and a zirconium dispersion ratio of 60% or more.
- the present invention since a glass layer resistant to a plating solution is formed, it is possible to provide an electronic component that can suppress peeling of the glass layer during electroplating.
- FIG. 1 is a schematic cross-sectional view of an exemplary electronic component in an embodiment of the present invention
- FIG. 1 shows a TEM image of a cross-sectional view of a glass layer and the result of examining the distribution of Ti and Zr from the TEM image by EDX analysis in an embodiment of the present invention.
- 1 shows a TEM image of a cross-sectional view of a glass layer and the result of examining the distribution of Ti and Zr from the TEM image by EDX analysis in an embodiment of the present invention.
- 1 is a schematic perspective view of a ceramic body in an example of the present invention; FIG.
- An electronic component of this embodiment includes a ceramic body, external electrodes provided on the surface of the ceramic body, and a glass layer covering at least a portion of the surface of the ceramic body, wherein the glass layer is Containing silicon atoms, titanium atoms and zirconium atoms, the glass layer has a titanium dispersion ratio of 90% or more and a zirconium dispersion ratio of 60% or more.
- the electronic component comprises a ceramic body, external electrodes and a glass layer provided on the surface of the ceramic body, the shape, size and material of the ceramic body, and the number, arrangement and shape of the external electrodes etc. are not particularly limited.
- the ceramic body may or may not have embedded internal electrodes, and if present, the internal electrodes are electrically connected to the external electrodes in a suitable manner.
- Electronic components that can be used in the present embodiment can be, for example, surface-mounted components, particularly chip components. (coils), resistors such as chip resistors, transistors, LC composites, and the like.
- the electronic component 10 of this embodiment can be a laminated ceramic capacitor as shown in FIG. and external electrodes 9a and 9b provided on the surface of the ceramic body 1 and electrically connected to the internal electrodes 5a and 5b, respectively. More specifically, the internal electrodes 5a and 5b are embedded in the ceramic body 1, laminated so as to be alternately exposed from the opposing end surfaces of the ceramic body 1, and electrically connected to the external electrodes 9a and 9b, respectively. ing.
- the electronic component 10 of this embodiment is not limited to the one illustrated in FIG. 1, and may be various electronic components as described above.
- Electronic component 10 of the present embodiment includes glass layer 6 in contact with the surface of ceramic body 1, as shown in FIG.
- the glass layer 6 covers at least part of the surface of the ceramic body 1 .
- the glass layer 6 preferably covers at least a portion of the surface of the ceramic body 1 on which the external electrodes 9a and 9b are not provided, and more preferably covers the entire surface.
- a part of the glass layer 6 may also be provided on the surface of the ceramic body 1 covered with the external electrodes 9a and 9b. Since the glass layer 6 is insulative, it is formed at a position avoiding the internal electrodes 5a and 5b.
- the glass layer 6 may be formed over the entire surface of the ceramic body 1 in the case of an electronic component (for example, a wire wound inductor) that does not have internal electrodes.
- a glass layer imparted with conductivity by containing a metal may be used.
- a conductive glass layer can also be provided on the internal electrodes 5a and 5b.
- the specific resistance of the conductive glass layer is desirably less than 1.0 ⁇ 10 ⁇ 2 ⁇ cm in order to ensure conduction with the internal electrodes.
- the glass layer 6 By configuring the glass layer 6 as described above, it is possible to protect the surface of the ceramic body 1 that is not covered with the external electrodes 9a and 9b when forming the plating layers.
- the glass layer 6 contains titanium atoms and zirconium atoms. Their content and dispersion state can be grasped as “titanium dispersion ratio” and "zirconium dispersion ratio".
- the “titanium dispersion ratio” corresponds to the area ratio of the region judged to contain the titanium (Ti) element in the cross section of the glass layer.
- the “zirconium dispersion ratio” corresponds to the area ratio of the region judged to contain the zirconium (Zr) element in the cross section of the glass layer. For example, if it is determined that the titanium element exists in the entire observation range of the cross section (100% of the area of the observation range), the titanium dispersion ratio will be 100%. Further, for example, if it is determined that the zirconium element exists in 80% of the area of the observation range of the cross section, the zirconium dispersion ratio will be 80%.
- the mechanism by which the plating solution resistance of the glass layer 6 can be improved when the titanium dispersion ratio and the zirconia dispersion ratio in the glass layer 6 are high it is speculated as follows.
- the surface of the glass layer 6 is dissolved and the thickness is reduced. If the pH of the plating solution is alkaline, the network structure of the glass layer may be destroyed.
- the stability constant of the metal oxide constituting the glass layer 6 and the components contained in the plating solution have an effect. dissolution can occur. The gradual dissolution of the glass layer 6 weakens the bond between the glass layer 6 and the ceramic body 1 and promotes separation therebetween.
- oxides such as SiO 2 , TiO 2 and ZrO 2 are present alone in the glass layer 6. It is presumed that a network such as Si--O--Ti or Si--O--Zr is formed.
- TiO 2 and ZrO 2 have high chemical stability and are strongly bonded as Si--O--Ti and Si--O--Zr. (that is, the titanium dispersion ratio and the zirconia dispersion ratio are high), dissolution of the glass layer 6 is suppressed, and plating solution resistance is improved.
- Ti 4+ and Zr 4+ which have larger ionic radii than Si 4+ ions and have larger bonding strength with oxygen ions, enter the space of the network structure.
- the glass layer has a titanium dispersion ratio of 90% or more and a zirconium dispersion ratio of 60% or more, so that a glass layer having excellent plating resistance can be obtained.
- the titanium dispersion ratio is preferably 95% or more, more preferably 99%, still more preferably 99.9%, and the upper limit is 100%.
- the zirconium dispersion ratio is preferably 75% or more, more preferably 78%, still more preferably 99.9%, and the upper limit is 100%.
- both the titanium dispersion ratio and the zirconium dispersion ratio are at high levels, such as a titanium dispersion ratio of 90% or more and a zirconium dispersion ratio of 60% or more, the plating solution resistance of the glass layer 6 is greatly improved. can.
- both titanium and zirconium have similar actions to improve plating solution resistance, a glass layer that satisfies only either the titanium dispersion ratio of 90% or more or the zirconium dispersion ratio of 60% or more. Even if it is 6, the resistance to the plating solution can be improved as compared with the conventional glass layer.
- the “titanium dispersion ratio” and the “zirconium dispersion ratio” are obtained by the following procedures 1) to 7) using the intensity data of the EDX image. First, the “titanium dispersion ratio” will be described as an example.
- the cross section of the glass layer 6 is observed at a magnification of about 200,000 times, and a TEM image and an EDX mapping image of Ti are obtained for the same observation area.
- the interface between them may be slightly inclined (see FIG. 3). If the tilt angle exceeds 20°, it is corrected by image processing so that it is within 20°, or the image of another portion of the glass layer 6 is changed.
- TEM-EDX device FE-TEM/EDX (JEOL JEM-F200 (manufactured by JEOL Ltd.) / analysis system Noran system 7 (manufactured by Thermo Fisher Scientific)
- the numerical data contained in the CVS file is assumed to be matrix-like numerical data.
- An example is matrix-like numerical data of 256 rows ⁇ 256 columns. Each of these numerical data corresponds to the intensity in each of the small sections obtained by dividing the TEM image and the EDX image into 256 divisions in the vertical direction and 256 divisions in the horizontal direction. If the matrix-like numerical data is output in the form of spreadsheet software, for example, the processing of subsequent procedures will be facilitated.
- Vmax is determined among numerical data contained in the CVS file, and a coefficient (100/Vmax) is determined using the maximum value.
- the positions of all the four corners on the numerical data in matrix form are specified, and the numerical values enclosed by the rectangular range having the two corners are specified.
- the data corresponds to intensity data included in the "measurement target area" specified in the EDX image.
- the glass layer 6 and other layers (ceramic Focus on the two corners adjacent to the interface with the element 1 or the protective film).
- FIG. 3 the upper left corner near the interface between the glass layer 6 and the protective film and the lower right corner near the interface between the glass layer 6 and the ceramic body 1 are shown.
- the corners are on the diagonals of the rectangular "area of interest”.
- the positions of these two corners are specified on the matrix-like numerical data in the CVS file by the method described above. Numerical data surrounded by a rectangular range having two corners corresponds to intensity data included in the "measurement target area" specified in the EDX image.
- a gap may occur at the interface between the glass layer 6 and the ceramic body 1 or at the interface between the glass layer 6 and the protective film. If the gap is located at any of the four corners, the two corners are determined by treating the surface of the glass layer 6 facing the gap as the "interface”. This makes it possible to clearly define the "measurement target area”.
- the porosity of the glass layer 6 is low. If there are voids, titanium and zirconium cannot be present in those portions. Therefore, if voids exist in the "measurement target area", the values of Nti20 and Nzr20 decrease, and the titanium dispersion ratio and the zirconium dispersion ratio decrease. Therefore, it is preferable that the glass layer 6 is dense.
- the glass layer 6 preferably has a thickness of 0.01 ⁇ m or more and 2 ⁇ m or less.
- Such a thin glass layer 6 can be formed by using a sol-gel method, for example.
- the external electrode 9 may include a base electrode layer and a plating layer arranged on the base electrode layer.
- the underlying electrode layer may include at least one of a baking layer, a resin layer and a thin film layer.
- the thickness of the base electrode layer is preferably 10 ⁇ m or more and 50 ⁇ m or less.
- the baking layer contains glass and metal.
- the metal material constituting the baking layer is composed of one metal selected from the group consisting of Ni, Cu, Ag, Pd and Au, or an alloy containing this metal, such as an alloy of Ag and Pd. etc. can be used.
- Glass contains Si and Zn.
- the baking layer may be composed of a plurality of laminated layers.
- the baking layer may be a layer in which a conductive paste is applied to the ceramic body and baked, or a layer that is baked at the same time as the internal electrodes 5a and 5b.
- the resin layer contains conductive particles and thermosetting resin.
- the resin layer may be provided directly on the ceramic body without providing the baking layer.
- the resin layer may be composed of a plurality of laminated layers.
- the maximum thickness of the resin layer is preferably 5 ⁇ m or more and 20 ⁇ m or less.
- the thin film layer is formed by a thin film forming method such as sputtering or vapor deposition.
- a thin film layer is a layer of 1 ⁇ m or less on which metal particles are deposited.
- the material constituting the plated layer is composed of one metal selected from the group consisting of Ni, Cu, Ag, Pd, and Au, or an alloy containing this metal, such as an alloy of Ag and Pd. can be used.
- the plating layer may be composed of a plurality of laminated layers.
- the plating layer preferably has a two-layer structure in which a Sn plating layer is formed on a Ni plating layer.
- the Ni plating layer has a function of preventing the underlying electrode layer from being eroded by solder when mounting the electronic component.
- the Sn plating layer has the function of improving wettability with solder when mounting electronic components, and facilitating the mounting of electronic components.
- the average thickness of the Ni plating layer is preferably 0.5 ⁇ m or more and 10 ⁇ m or less.
- the average thickness of the Sn plating layer is preferably 0.5 ⁇ m or more and 10 ⁇ m or less.
- the electronic component 10 of this embodiment can be manufactured, for example, by the following method.
- the ceramic body 1 is prepared.
- the ceramic body 1 can be made by any suitable method.
- the ceramic material forming the ceramic body 1 is not particularly limited, and is not particularly limited as long as it is a ceramic material used for electronic components. Since the electronic component 10 exemplarily shown in FIG. 1 is a multilayer capacitor, the ceramic material is a dielectric material such as BaTiO 3 , CaTiO 3 , SrTiO 3 , CaZrO 3 , (BaSr)TiO 3 , Ba( ZrTi )O3 and ( BiZn ) Nb2O7 and the like. If present, the material forming the internal electrodes 5a and 5b is not particularly limited as long as it is conductive, and examples thereof include Ag, Cu, Pt, Ni, Al, Pd, and Au. Ag, Cu, and Ni are preferable for the material forming the internal electrodes 5a and 5b.
- the ceramic material used in the present embodiment is not limited to the materials described above, and can be appropriately selected according to the type, configuration, etc. of the electronic component.
- the ceramic material may be a ferrite material containing Fe, Ni, Zn, Mn, Cu, or the like.
- the ceramic body may have coils instead of the internal electrodes.
- Such a coil may be, for example, pre-embedded in the ceramic body or wound around the ceramic body before or after forming the external electrodes, as long as it is finally electrically connected to the external electrodes.
- the glass layer 6 is formed on the surface of the ceramic body 1 except for the internal electrodes 5a and 5b.
- the glass layer 6 can be formed by a thin film forming method using a solution.
- Sol-gel methods, MOD (metal organic compound decomposition) methods, CSD (chemical solution deposition) methods, and the like can be used as thin film preparation methods. These methods are often treated synonymously.
- the term "sol-gel method” is used to encompass the narrow sense of "sol-gel method", MOD and CSD, unless otherwise specified.
- the glass layer 6 By forming the glass layer 6 by build-up from precursors of TiO 2 and ZrO 2 using a sol-gel method, a dense glass layer 6 with few pores can be formed. Further, by allowing the sol-gel reaction to progress slowly, it is possible to suppress the formation of voids inside the glass layer 6 .
- methods for allowing the sol-gel reaction to proceed slowly include using a solvent with a high boiling point as the solvent used in the raw material composition, and reducing the rate of temperature rise during heat treatment.
- the raw material composition may be a liquid (paste) in which a glass raw material (glass precursor) and an organic polymer are dissolved or dispersed in a solvent.
- the glass precursor is a glass raw material, and any starting material that can form a glass matrix (glass region 13) may be used.
- Precursors of glass essentially include precursors of TiO 2 and ZrO 2 in addition to precursors of SiO 2 , which is the main skeleton of glass, and others can be mixed as appropriate.
- Glass precursors include metal alkoxides, acetylacetonate complexes, acetates, and the like. In addition, these raw materials may be modified with functional groups such as long-chain alkyl groups and epoxy groups. Compounds that can be used as glass precursors are described below.
- metal alkoxide Elements capable of synthesizing metal alkoxides include Li, Be, B, C, Na, Mg, Al, Si, P, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Rb, Sr, Y, Zr, Nb, Mo, Cd, In, Sn, Sb, Cs, Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Hg, Tl, Pb, Bi, Th, Pa, U, Pu. Alkoxides of these elements can be used as precursors for glasses.
- metal alkoxides that can be used as glass precursors are shown below.
- acetylacetonate complex Specific acetylacetonate complexes that can be used as glass precursors are illustrated below. Lithium acetylacetonate, Titanium(IV) oxyacetylacetonate, Titanium diisopropoxide bis(acetylacetonate), Zirconium(IV) trifluoroacetylacetonate, Zirconium(IV) acetylacetonate , aluminum acetylacetonate, aluminum (III) acetylacetonate, calcium (II) acetylacetonate, zinc (II) acetylacetonate, and other metal complexes of acetylacetonate.
- Acetate Specific acetates that can be used as glass precursors are exemplified below. Acetates such as zirconium acetate, zirconium(IV) acetate hydroxide, and basic aluminum acetate.
- the glass contained in the glass layer 6 may contain additives (hereinafter referred to as "glass additives") such as those exemplified below. Additives can be mixed in the form of powders, microparticles or nanoparticles.
- Soda Ash (Sodium Carbonate Na2CO3 ), Sodium Hydrogen Carbonate ( NaHCO3 ) , Sodium Percarbonate ( 2Na2CO3.3H2O2 ), Sodium Sulfite ( Na2SO3 ), Sodium Hydrogen Sulfite ( NaHSO3 ) , sodium sulfate ( Na2SO4 ), sodium thiosulfate ( Na2S2O3 ), sodium nitrate ( NaNO3 ) , sodium sulfite ( NaNO2 ) and other oxoacid salts; sodium fluoride (NaF), chloride Halogen compounds such as sodium (NaCl), sodium bromide (NaBr) and sodium iodide (NaI); oxides such as sodium peroxide ( Na2O2 ) and sodium hydroxide (NaOH); hydroxides and hydrogenation Sodium (NaH), sodium sulfide ( Na2S), sodium hydrogen sulfide (NaHS), sodium silicate ( Na
- Calcium peroxide CaO2
- calcium hydroxide Ca(OH) 2
- calcium fluoride CaF2
- calcium chloride CaCl2.2H2O
- calcium bromide CaBr2.2H2O
- Inorganic salts such as calcium iodide (CaI 2 3H 2 O), calcium hydride (CaH 2 ), calcium carbide (CaC 2 ), calcium phosphide (Ca 3 P 2 ); calcium carbonate (CaCO 3 ), hydrogen carbonate Calcium (Ca( HCO3 ) 2 ), Calcium nitrate (Ca( NO3 ) 2.4H2O ), Calcium sulfate ( CaSO4.2H2O ), Calcium sulfite ( CaSO3 ) , Calcium silicate ( CaSiO3 or Ca 2 SiO 4 ), calcium phosphate (Ca 3 (PO 4 ) 2 ), calcium pyrophosphate (Ca 2 O 7 P 2 ), calcium hypochlorite (Ca[ClO)
- Lithium carbonate ( Li2CO3 ) lithium chloride (LiCl), lithium titanate ( Li2TiO3 ), lithium nitride ( Li3N ), lithium peroxide ( Li2O2 ), lithium citrate ( Li3C 6H5O7 ), lithium fluoride ( LiF), lithium hexafluorophosphate ( LiPF6 ), lithium acetate ( C2H3LiO2 ), lithium iodide ( LiI), lithium hypochlorite ( ClLiO ) , lithium tetraborate (Li 2 B 4 O 7 ), lithium bromide (LiBr), lithium nitrate (LiNO 3 ), lithium hydroxide (LiOH), lithium aluminum hydride (LiAlH 4 ), lithium triethylborohydride ( Li( C2H5 ) 3BH ) , lithium hydride (LiH), lithium amide ( LiNH2 ), lithium imide ( Li2NH ), lithium diisopropy
- boron triiodide (BI3), sodium cyanoborohydride ( NaBH3CN ), sodium borohydride (NaBH4), tetrafluoroboric acid ( HBF4 ), triethylborane ( ( CH3CH2 ) 3B ), Borax ( Na2B4O5 ( OH) 4.8H2O ), boric acid (B (OH)3 ) .
- Organic polymers are used to increase the viscosity of the raw material composition to make it pasty.
- organic polymers include acrylic (acrylic acid, methacrylic acid, or homopolymers or copolymers of their esters, specifically acrylic acid ester copolymers, methacrylic acid ester copolymers, acrylic acid ester-methacrylic acid ester copolymer, etc.), polyvinyl acetal (specifically, polyvinyl acetal, polyvinyl butyral, etc.), cellulose (specifically, hydroxypropylcellulose, cellulose ether, carboxymethylcellulose, acetylcellulose, acetylnitrocellulose, etc.), Polyvinyl alcohol-based, polyvinyl acetate-based, polyvinyl chloride, polypropylene carbonate-based, polyvinylpyrrolidone, and other homopolymers or copolymers may be mentioned, and at least one selected from these may be contained.
- Solvents are alcohol-based (specifically, 2-ethylhexanol (185°C), benzyl alcohol (205°C), 1,3-butanediol (207°C), 1,4-butanediol (228°C), etc.) , Ketone-based (specifically, cyclohexanone (156 ° C), diacetone alcohol (166 ° C), diisobutyl ketone (168 ° C), etc.), glycol ether-based (specifically, butyl carbitol acetate (247 ° C), Ethyl carbitol (202°C), diethylene glycol monoethyl ether (202°C), diethylene glycol monomethyl ether (194°C), ethylene glycol monomethyl ether acetate (144°C), ethylene glycol monoethyl ether (135°C), ethylene glycol monomethyl ether ( 124°C), 2-methoxyethanol (124°C), propylene glycol monomethyl
- the feedstock composition may include frit (and optionally glass additives), and solvent, as well as any suitable reactants and additives, and the like.
- a reactant for obtaining a compound having a structure represented by the formula -OMO- (M is a metal atom) as a main skeleton by reacting a metal alkoxide for example, water or an alkoxy group of a metal alkoxide is converted to a hydroxyl group. and hydroxy group-containing compounds that can be substituted for.
- additives include catalysts that promote such reactions, viscosity modifiers, pH modifiers, stabilizers, and the like.
- such a raw material composition is applied to a predetermined region of the ceramic body 1 and dried as appropriate to form a coating film derived from the raw material composition.
- the coating method is not particularly limited, and dipping, spraying, screen printing, brush coating, inkjet printing, and the like can be used. Drying is carried out such that most, preferably substantially all, of the solvent in the raw composition is removed. More specifically, drying can be carried out by heating the ceramic body coated with the raw material composition at, for example, 25 to 200° C. for 5 to 60 minutes.
- the heat treatment temperature and time may be, for example, 300° C. or higher and 1100° C. or lower, for example, 10 to 60 minutes.
- the temperature of the heat treatment is particularly preferably 400° C. or higher and 1000° C. or lower.
- the raw material composition is gelled to form the glass layer 6 as a sol-gel fired film.
- the glass layer 6 formed by the sol-gel method in this way is a dense glass layer 6 with few pores.
- External electrodes are formed on the obtained ceramic body with the glass layer.
- a base electrode layer is formed on the surface of the ceramic body with the glass layer.
- the base electrode layer of the external electrodes 9 is formed by various thin film forming methods, various printing methods, dipping methods, or the like.
- the conductive paste is baked after applying the conductive paste to both end faces of the ceramic body.
- the conductive paste contains an organic solvent, metal particles and glass. The baking temperature is, for example, 840°C.
- a plating layer is formed by plating so as to cover the base electrode layer.
- the external electrodes 9 are formed by forming the plating layers. Electroplating can be performed by immersing a ceramic body having an underlying electrode layer in a plating solution (plating bath) and plating under predetermined conditions.
- the plating solution to be used and the conditions for the plating treatment can be appropriately selected according to the type of metal to be plated, the thickness of the plating film, and the like.
- the electronic component 10 of the present embodiment can be manufactured.
- ceramic bodies for wound inductors were used on the assumption that the electronic components were wound inductors. fits.
- Example 1 Preparation of ceramic body 1'
- a ceramic body 1' for a wound inductor was prepared.
- This ceramic body 1' was made of a ferrite material and had a shape as schematically shown in FIG.
- a raw material composition (paste) was prepared by mixing raw materials (components) shown in Table 1 in a predetermined mass.
- the paste contains Si alkoxide (TEOS: tetraethyl orthosilicate), Ti alkoxide (TiBu: titanium butoxide), and Zr alkoxide (ZrPr: zirconia propoxide) as glass precursors.
- TEOS tetraethyl orthosilicate
- Ti alkoxide TiBu: titanium butoxide
- Zr alkoxide ZrPr: zirconia propoxide
- 0.01N-HCl (0.01 N hydrochloric acid aqueous solution) functions as a catalyst acid and water for hydrolysis
- HPC hydroxypropyl cellulose
- a coating film derived from the raw material composition was formed.
- the coated ceramic body 1′ was heat-treated at 815° C. for 30 minutes in an air atmosphere (ordinary pressure) to form a glass layer derived from the coating film, which was used as a sample for measurement. .
- Example 2-5 Comparative Examples 1-2
- a glass layer was formed on the surface of the ceramic body in the same manner as in Example 1, except that the solvents shown in Table 2 were used (Examples 2-5, Comparative Examples 1-2).
- Table 2 shows the results of the titanium dispersion ratio and the zirconium dispersion ratio of each sample. Note that Example 1 is also shown in Table 2.
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Abstract
Description
しかしながら、ガラスはめっき液に対する耐性が低いことがあり、めっき工程中にガラス層がセラミック素体から剥離するおそれがある。ガラス層が剥離すると、セラミック素体の側面にめっき膜が形成され得るため、ガラス層の剥離を抑制することが求められる。
そこで本発明は、めっき液に対して耐性のあるガラス層を備えた電子部品を提供することを目的とする。
以下に、本発明に係る電子部品について説明する。
ガラス層6は絶縁性であるので、内部電極5a、5bを避けた位置に形成する。内部電極が存在しない電子部品(例えば、巻き線インダクタ)であれば、セラミック素体1の全面にガラス層6を形成してもよい。
導電性のガラス層の比抵抗は内部電極との導通確保のため、比抵抗は1.0×10-2Ω・cm未満であることが望ましい。
「チタン分散比率」は、ガラス層の断面において、チタン(Ti)元素が存在すると判断された領域の面積率に相当する。同様に、「ジルコニウム分散比率」は、ガラス層の断面において、ジルコニウム(Zr)元素が存在すると判断された領域の面積率に相当する。
例えば、断面の観察範囲全体(観察範囲の面積の100%)にチタン元素が存在すると判断されると、チタン分散比率は100%になる。
また、例えば、断面の観察範囲の面積の80%にジルコニウム元素が存在すると判断されると、ジルコニウム分散比率は80%になる。
まず、ガラス層6がめっき液に接触すると、ガラス層6の表面が溶解して厚さが減少する。めっき液のpHがアルカリ性である場合は、ガラス層の網目構造を破壊してしまうことが考えられる。他にも、めっき液に含まれる成分と、ガラス層6を構成する金属酸化物の安定度定数が影響していると考えられ、安定度定数が高いと、ガラス層6を構成する金属酸化物の溶解が起き得る。ガラス層6が徐々に溶解することにより、ガラス層6とセラミック素体1との間の結合が脆弱になり、それらの間の剥離が進行する。
チタン分散比率は、好ましくは95%以上であり、より好ましくは99%であり、さらに好ましくは99.9%であり、上限は100%である。
ジルコニウム分散比率は、好ましくは75%以上であり、より好ましくは78%であり、さらに好ましくは99.9%であり、上限は100%である。
まず「チタン分散比率」を例にとって説明する。
なお、図3のように、それらの界面が水平方向から傾斜している場合は、下側の破線は、ガラス層6とセラミック素体1との界面のうち最も高い位置を通るように水平に引き、上側の破線は、ガラス層6と保護膜との界面のうち最も低い位置を通るように水平に引く。このように破線を引くことにより、2本の破線で挟まれた「測定対象領域」には、ガラス層6のみが含まれるようになる。
チタン分散比率(%)=Nti20/Ntitotal×100・・・(1)
ジルコニウム分散比率(%)=Nzr20/Nzrtotal×100・・・(2)
同様に、ジルコニウム分散比率が高い場合には、「測定対象領域」内においてジルコニウムが比較的均一に分散していると推測することができる。
本実施形態の電子部品10は、例えば以下の方法により製造可能である。
まず、セラミック素体1を準備する。セラミック素体1は、任意の適切な方法により作製され得る。
次に、セラミック素体1の表面のうち、内部電極5a、5bを除いた領域にガラス層6を形成する。
ガラスの前駆体はガラス原料であり、ガラスのマトリクス(ガラス領域13)を生じ得る出発原料であればよい。ガラスの前駆体としては、ガラスの主骨格となるSiO2の前駆体に加え、TiO2、ZrO2の前駆体を必須で含み、さらにその他は適宜混合できる。ガラスの前駆体としては、金属アルコキシド、アセチルアセトナート錯体、酢酸塩等が挙げられる。また、それらの原料は、長鎖アルキル基やエポキシ基等の官能基で修飾されていてもよい。以下に、ガラスの前駆体として使用し得る化合物について説明する。
金属アルコキシドを合成可能な元素としては、Li, Be, B, C, Na, Mg, Al, Si, P, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Rb, Sr, Y, Zr, Nb, Mo, Cd, In, Sn, Sb, Cs, Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Hg, Tl, Pb, Bi, Th, Pa, U, Puが挙げられる。これらの元素のアルコキシドは、ガラスの前駆体として利用し得る。
ナトリウムメトキシド、ナトリウムエトキシド、カルシウムジエトキシド、リチウムイソプロポキシド、リチウムエトキシド、リチウムtert-ブトキシド、リチウムメトキシド、ホウ素アルコキシド、カリウム t-ブトキシド、オルトケイ酸テトラエチル、アリルトリメトキシシラン、イソブチル(トリメトキシ)シラン、オルトケイ酸テトラプロピル、オルトケイ酸テトラメチル、 [3-(ジエチルアミノ)プロピル]トリメトキシシラン、トリエトキシ(オクチル)シラン、トリエトキシビニルシラン、トリエトキシフェニルシラン、トリメトキシフェニルシラン、トリメトキシメチルシラン、ブチルトリクロロシラン、n-プロピルトリエトキシシラン、メチルトリクロロシラン、ジメトキシ(メチル)オクチルシラン(Dimethoxy(methyl)octylsilane)、ジメトキシジメチルシラン、トリス(tert-ブトキシ)シラノール、トリス(tert-ペントキシ)シラノール、ヘキサデシルトリメトキシシラン、トリス(1,2-ベンゼンジオラート-O,O′)ケイ酸二カリウム(Dipotassium tris(1,2-benzenediolato-O,O′)silicate)、オルトケイ酸テトラブチル、ケイ酸アルミニウム、ケイ酸カルシウム、ケイ酸テトラメチルアンモニウム 溶液、クロロトリイソプロポキシチタン(IV)、チタン(IV)イソプロポキシド、チタン(IV) 2-エチルヘキシルオキシド、チタン(IV)エトキシド、チタン(IV)ブトキシド、チタン(IV)tert-ブトキシド、チタン(IV)プロポキシド、チタン(IV)メトキシド、ジルコニウム(IV)ビス(ジエチルシトレート)ジプロポキシド(Zirconium(IV) bis(diethyl citrato)dipropoxide)、ジルコニウム(IV)ジブトキシド(ビス-2,4-ペンタンジオネート)(Zirconium(IV) dibutoxide(bis-2,4-pentanedionate))、ジルコニウム(IV)2-エチルヘキサノエート(Zirconium(IV) 2-ethylhexanoate)、ジルコニウム(IV)イソプロポキシドイソプロパノール錯体、ジルコニウム(IV)エトキシド、ジルコニウム(IV)ブトキシド、ジルコニウム(IV)tert-ブトキシド、ジルコニウム(IV)プロポキシド、アルミニウムtert-ブトキシド(Aluminum tert-butoxide)、アルミニウムイソプロポキシド、アルミニウムエトキシド、アルミニウム-トリ-sec-ブトキシド、アルミニウムフェノキシド等の金属アルコキシド。
ガラスの前駆体として利用できる具体的なアセチルアセトナート錯体を以下に例示する。
リチウムアセチルアセトナート、チタン(IV)オキシアセチルアセトナート、チタンジイソプロポキシドビス(アセチルアセトナート)、ジルコニウム(IV)トリフルオロアセチルアセトナート(Zirconium(IV) trifluoroacetylacetonate)、ジルコニウム(IV)アセチルアセトナート、アセチルアセトン酸アルミニウム、アルミニウム(III)アセチルアセトナート、カルシウム(II)アセチルアセトナート、亜鉛(II)アセチルアセトナート等のアセチルアセトナートの金属錯体。
ガラスの前駆体として利用できる具体的な酢酸塩を以下に例示する。
酢酸ジルコニウム、酢酸水酸化ジルコニウム(IV)、塩基性酢酸アルミニウム等の酢酸塩。
ガラス層6に含まれるガラスは、以下に例示するような添加物(これを「ガラス用添加物」と称する)を含んでもよい。添加物は、粉末、微粒子またはナノ粒子の形態で混合し得る。
有機高分子は、原料組成物の粘度を増加してペースト状にするために使用される。有機高分子としては、アクリル系(アクリル酸、メタクリル酸またはそれらのエステルの単独重合体または共重合体、具体的にはアクリル酸エステル共重合体、メタクリル酸エステル共重合体、アクリル酸エステル-メタクリル酸エステル共重合体等)、ポリビニルアセタール系(具体的にはポリビニルアセタール、ポリビニルブチラール等)、セルロース系(具体的にはヒドロキシプロピルセルロース、セルロースエーテル、カルボキシメチルセルロース、アセチルセルロース、アセチルニトロセルロース等)、ポリビニルアルコール系、ポリ酢酸ビニル系、ポリ塩化ビニル、ポリプロピレンカーボネート系、ポリビニルピロリドン等の単独重合体または共重合体が挙げられ、これらの中から選ばれる少なくとも1種を含有する。
溶媒は、アルコール系(具体的には、2-エチルヘキサノール(185℃)、ベンジルアルコール(205℃)、1,3-ブタンジオール(207℃)、1,4-ブタンジオール(228℃)等)、ケトン系(具体的には、シクロヘキサノン(156℃)、ダイアセトンアルコール(166℃)、ジイソブチルケトン(168℃)等)、グリコールエーテル系(具体的には、ブチルカルビトールアセテート(247℃)、エチルカルビトール(202℃)、ジエチレングリコールモノエチルエーテル(202℃)、ジエチレングリコールモノメチルエーテル(194℃)、エチレングリコールモノメチルエーテルアセテート(144℃)、エチレングリコールモノエチルエーテル(135℃)、エチレングリコールモノメチルエーテル(124℃)、2-メトキシエタノール(124℃)、プロピレングリコールモノメチルエーテル(121℃)等)が好ましい。これらの溶媒は沸点が高いため、ゾル-ゲル反応が緩やかに進み、ガラス層6内部に空隙が生まれにくく、チタン分散比率およびジルコニウム分散比率を向上できると考えられる。
原料組成物は、ガラス原料(および任意でガラス用添加物)、および溶媒に加えて、任意の適切な反応物質および添加剤等を含み得る。金属アルコキシドを反応させて式-O-M-O-(Mは金属原子)で表される構造を主骨格として有する化合物を得るための反応物質として、例えば水や、金属アルコキシドのアルコキシ基を水酸基に置換し得るヒドロキシ基含有化合物等が挙げられる。添加剤としては、例えば、かかる反応を促進する触媒や、粘度調整剤、pH調整剤、安定化剤等が挙げられる。
このようにゾル-ゲル法で形成されたガラス層6は、細孔が少ない緻密なガラス層6になる。
得られたガラス層付きのセラミック素体に、外部電極を形成する。
ガラス層付きのセラミック素体の表面に下地電極層が形成される。具体的には、外部電極9の下地電極層が、各種の薄膜形成法、各種の印刷法またはディップ法などにより形成される。たとえば、ディップ法により下地電極層を形成する場合、セラミック素体の両端面に導電性ペーストを塗布した後、導電性ペーストを焼き付ける。導電性ペーストは、有機溶剤と金属粒子とガラスとを含む。焼付け温度は、例えば840℃である。
電解めっきは、下地電極層を備えるセラミック素体をめっき液(めっき浴)に浸漬して、所定の条件でめっき処理することにより実施され得る。使用するめっき液およびめっき処理の条件は、めっきする金属の種類、めっき膜の厚さ等に応じて適宜選択し得る。
1)セラミック素体1’の準備
まず、巻線インダクタ用のセラミック素体1’を準備した。このセラミック素体1’は、フェライト材料から成り、図4に模式的に示すような形状を有していた。このセラミック素体1’の各寸法は次の通りであった:L=0.70mm、W=0.30mm、T=0.50mm、E=0.30mm、F=0.32mm、G=0.29mm。
表1に示す原料(成分)を所定質量にて混合して原料組成物(ペースト)を調製した。なお、ペーストは、ガラスの前駆体として、Siアルコキシド(TEOS:オルトケイ酸テトラエチル)、Tiアルコキシド(TiBu:チタンブトキシド)、Zrアルコキシド(ZrPr:ジルコニアプロポキシド)を含む。0.01N-HCl(0.01規定塩酸水溶液)は、触媒である酸と加水分解用の水として機能し、HPC(ヒドロキシプロピルセルロース)は、粘度調整剤および安定化剤として機能する。
次に、上記セラミック素体1’の下側のLW面(図4参照)およびその外周に、原料組成物を塗布し、空気雰囲気(常圧)下、150℃にて30分間乾燥させて、原料組成物に由来する塗膜を形成した。
使用する溶媒を表2に示す溶媒としたこと以外は、実施例1と同様にして、セラミック素体の表面にガラス層を形成した(実施例2~5、比較例1~2)。各試料のチタン分散比率およびジルコニウム分散比率の結果を表2に示す。なお、実施例1についても表2に記載した。
1.同じ条件で作製したガラス層のサンプルを、各々の実施例および比較例で最低N=10準備した。
2.SEM-EDXにより倍率約1000倍でガラス層表面のEDX像と原子比率をサンプル数N=5で取得した。
3.ガラス成分(Si、Ti、ZrおよびAl)の原子%を全て足し合わせる。これをセラミック素体の主成分(Fe)で割り、N=5で取得したあと平均値を出して、これを初期のガラス量とした。
4.SEM-EDXを測定していない残りのサンプルをCuめっき液に60℃24時間浸漬し、水洗、乾燥した。
5.4のサンプルを使い2~3を行い、この数値を浸漬後のガラス量とした。
6.3、5で得られたガラス量からめっき液浸漬による減少率を算出した。
実施例1~5は、使用した溶媒の沸点が高かったので、ガラス中のTiおよびZrの分散比率が高く、そのためガラス層の減少率が少なかった。一方、比較例1はガラスにTiおよびZrを混合しなかったので、ガラス層の減少率が多かった。比較例2は、使用した溶媒の沸点が低かったので、ガラス中のTiおよびZrの分散比率が低く、そのためガラス層の減少率が多かった。
3 セラミック部
5a、5b 内部電極
6 ガラス層
9、9a、9b 外部電極
10 電子部品
Claims (2)
- セラミック素体と、該セラミック素体の表面の一部に設けられた外部電極と、前記セラミック素体の前記表面の少なくとも一部を覆うガラス層とを備え、
前記ガラス層はケイ素原子、チタン原子およびジルコニウム原子を含み、前記ガラス層は、チタン分散比率が90%以上であり、ジルコニウム分散比率が60%以上である、電子部品。 - 前記チタン分散比率が95%以上であり、ジルコニウム分散比率が75%以上である、請求項1に記載の電子部品。
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| JP2023508811A JP7521691B2 (ja) | 2021-03-26 | 2022-02-21 | 電子部品 |
| CN202280016721.4A CN116897402A (zh) | 2021-03-26 | 2022-02-21 | 电子部件 |
| US18/362,132 US12308174B2 (en) | 2021-03-26 | 2023-07-31 | Electronic component |
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| KR102810064B1 (ko) * | 2023-12-01 | 2025-05-23 | 주식회사 베이스 | 글라스 프릿 및 이를 포함하는 적층 세라믹 커패시터의 외부 전극용 도전성 페이스트 조성물 |
| EP4571804A3 (en) * | 2023-12-15 | 2025-11-05 | Samsung Electro-Mechanics Co., Ltd. | External electrode for multilayer electronic component comprising a glass layer, a first electrode layer and a conductive resin layer |
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- 2022-02-21 WO PCT/JP2022/007004 patent/WO2022202039A1/ja not_active Ceased
- 2022-02-21 JP JP2023508811A patent/JP7521691B2/ja active Active
- 2022-02-21 CN CN202280016721.4A patent/CN116897402A/zh active Pending
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2023
- 2023-07-31 US US18/362,132 patent/US12308174B2/en active Active
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| JPH04266006A (ja) * | 1991-02-21 | 1992-09-22 | Matsushita Electric Ind Co Ltd | 厚膜コンデンサ及びその製造方法 |
| JPH06244008A (ja) * | 1993-02-15 | 1994-09-02 | Mitsubishi Electric Corp | 非直線性抵抗体避雷器素子のガラス被覆法 |
| JPH09162016A (ja) * | 1995-12-12 | 1997-06-20 | Matsushita Electric Ind Co Ltd | 酸化亜鉛バリスタおよびその製造方法およびそれらに用いる被覆用結晶化ガラス組成物 |
| JP2005005412A (ja) * | 2003-06-11 | 2005-01-06 | Murata Mfg Co Ltd | チップ型セラミック電子部品の製造方法 |
| WO2013140903A1 (ja) * | 2012-03-19 | 2013-09-26 | 株式会社村田製作所 | セラミック電子部品 |
| JP2013197509A (ja) * | 2012-03-22 | 2013-09-30 | Tdk Corp | セラミック電子部品 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102810064B1 (ko) * | 2023-12-01 | 2025-05-23 | 주식회사 베이스 | 글라스 프릿 및 이를 포함하는 적층 세라믹 커패시터의 외부 전극용 도전성 페이스트 조성물 |
| EP4571804A3 (en) * | 2023-12-15 | 2025-11-05 | Samsung Electro-Mechanics Co., Ltd. | External electrode for multilayer electronic component comprising a glass layer, a first electrode layer and a conductive resin layer |
Also Published As
| Publication number | Publication date |
|---|---|
| US12308174B2 (en) | 2025-05-20 |
| JPWO2022202039A1 (ja) | 2022-09-29 |
| CN116897402A (zh) | 2023-10-17 |
| US20240029957A1 (en) | 2024-01-25 |
| JP7521691B2 (ja) | 2024-07-24 |
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