WO2014097822A1 - 積層セラミック電子部品 - Google Patents
積層セラミック電子部品 Download PDFInfo
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- WO2014097822A1 WO2014097822A1 PCT/JP2013/081568 JP2013081568W WO2014097822A1 WO 2014097822 A1 WO2014097822 A1 WO 2014097822A1 JP 2013081568 W JP2013081568 W JP 2013081568W WO 2014097822 A1 WO2014097822 A1 WO 2014097822A1
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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
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
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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
- 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
- H01G4/005—Electrodes
- H01G4/012—Form of non-self-supporting electrodes
-
- 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
-
- 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
- H01G4/248—Terminals the terminals embracing or surrounding the capacitive element, e.g. caps
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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
Definitions
- the present invention relates to a multilayer ceramic electronic component, and more particularly to a configuration of an external electrode.
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-279903
- Patent Document 2 International Publication No. 2004/053901
- a conductive adhesive is described.
- the blending ratio of the low melting point metal (A) is defined as 5 to 50% by weight in claim 1 of Patent Document 1. ing.
- a low melting point metal It has been found that when the blending ratio of A) is less than 36.5% by weight or exceeds 47.8% by weight, the bondability to the internal electrode becomes poor.
- Patent Document 2 discloses a thermosetting conductive paste containing a metal powder (metal A) having a melting point of 300 ° C. or less, conductive particles having a high melting point (metal B), and a resin as described in claim 1.
- a multilayer ceramic electronic component having an external electrode formed is described.
- Claim 2 stipulates that the total amount of A + B in the paste is 70 to 95% by weight with respect to the total amount of A + B + resin. The ratio is specified to be 5:95 to 20:80 by weight. Further, in the same claim 4, in order to obtain an external electrode, it is prescribed to hold at 80 to 400 ° C. for 1 to 60 minutes. In the same claim 5, the conductive particles in the external electrode and the metal of the internal electrode are specified. And are diffusion-bonded.
- Patent Document 2 stipulates that the blending ratio of the low melting point metal (A) is 5 to 20% by weight.
- a low melting point metal Since the ratio of A was as low as 5 to 20% by weight, it was found that the bondability with the internal electrode was poor. If the heat treatment is performed at 500 ° C. or more exceeding the range of 80 to 400 ° C. specified in claim 4, good bonding with the internal electrode is possible, but metal balls are deposited from the external electrode ( In other plating processes such as Ni plating that are performed thereafter, defective plating is caused.
- an object of the present invention is to solve the above-described problems, have a good bondability to the internal electrode, and have a multilayer ceramic provided with an external electrode in which the precipitation (or ejection) of metal balls is suppressed. It is to provide electronic components.
- the present invention includes a laminate in which a ceramic layer and an internal electrode are laminated, and an external electrode formed on the outer surface of the laminate so as to be electrically connected to the internal electrode.
- the conductive layer includes a conductive layer in contact with the internal electrode, and the internal electrode is directed to a multilayer ceramic electronic component including Ni.
- the conductive layer includes a Cu 3 Sn alloy.
- the metal particles including the metal particles and the thermosetting resin are characterized in that the weight ratio of Sn to the total amount of Sn and Cu is 36.5 to 47.8%.
- Cu 3 Sn alloy which is an intermetallic compound that can be generated in the conductive layer of the external electrode, is a composition having a weight ratio of Cu: Sn of 62:38. Therefore, it is presumed that when the Sn amount, which is the equivalent of Cu 3 Sn, is in the vicinity of 38%, metal bonding is performed with the internal electrode containing Ni.
- the Cn 3 Sn alloy ratio with respect to the total amount of Sn and Cu contained in the metal particles is 25% by weight or more.
- the Cu 3 Sn alloy ratio is 25% by weight or more, it is estimated that variation in electrical characteristics can be reduced.
- a CuSnNi alloy phase is formed at a portion in contact with the internal electrode and the conductive layer, and the Ni solid solution amount in the alloy phase is 5 to 42 atm%.
- the Ni solid solution amount in the alloy phase is 5 to 42 atm%.
- the conductive layer described above preferably includes Cu powder, Sn powder, a thermosetting resin, and an organic solvent, and the content of Sn powder with respect to the total amount of Cu powder and Sn powder is 36.5 to 47.8. It is obtained by thermosetting a thermosetting conductive resin composition having a weight%.
- the residual stress after curing of the thermosetting conductive resin composition is preferably 8 MPa or more.
- the fact that the residual stress after curing is as large as 8 MPa or more means that the amount of shrinkage at the time of curing of the resin composition is large, and the external electrode has a large clamping force against the metal particles by the thermosetting resin. Become. Therefore, since the contact probability between the Cu powder and the Sn powder is increased, a Cu 3 Sn alloy is easily generated. At the same time, the distance between the metal particles is shortened, and the external electrode exhibits good conductivity. Therefore, the multilayer ceramic electronic component can provide good and stable electrical characteristics.
- the total content of Cu powder and Sn powder in the thermosetting conductive resin composition is preferably 45 to 65% by volume excluding the organic solvent. According to this configuration, the application shape of the thermosetting conductive resin composition can be made good, and the plating property such as Ni plating on the external electrode formed thereby is good. It can be.
- the D50 of the Cu powder is 0.5 to 3.0 ⁇ m and the D50 of the Sn powder is 1.5 to 5.0 ⁇ m before the thermosetting conductive resin composition is cured. According to this configuration, the application shape of the thermosetting conductive resin composition can be improved, and the plating property such as Ni plating on the external electrode can be improved. At the same time, the density of the external electrode can be increased.
- the deposition (or ejection) of metal balls on the external electrode first, it is possible to suppress the deposition (or ejection) of metal balls on the external electrode.
- the plurality of metal particles including the Cu 3 Sn alloy are generated by mutual diffusion of Cu and Sn in the heat treatment process for forming the external electrode.
- Cu 3 Sn has a melting point of 600 ° C. or more, the heat treatment process Does not remelt. Therefore, as described above, it is presumed that the precipitation (or ejection) of the metal ball can be suppressed.
- an external electrode shows favorable joining property with respect to an internal electrode.
- Cu 3 Sn which is an intermetallic compound that can be generated in the conductive layer of the external electrode, is a composition having a weight ratio of Cu: Sn of 62:38. Therefore, it is presumed that when the Sn amount, which is the equivalent of Cu 3 Sn, is in the vicinity of 38%, metal bonding is performed with the internal electrode containing Ni. And it is estimated that this has contributed to the improvement of bondability.
- FIG. 1 is a cross-sectional view showing a multilayer ceramic capacitor 1 according to an embodiment of the present invention.
- FIG. 2 is a partially enlarged cross-sectional view of the conductive layer 10 schematically showing the formation process of the conductive layer 10 in the external electrodes 8 and 9 of the multilayer ceramic capacitor 1 shown in FIG. 1, wherein (1) is a state before heat treatment; 2) shows the state after heat treatment. It is a figure which shows the SEM photograph which image
- a multilayer ceramic capacitor 1 includes a multilayer body 5 in which a plurality of ceramic layers 2 made of a dielectric ceramic and a plurality of first and second internal electrodes 3 and 4 are laminated. .
- the first internal electrodes 3 and the second internal electrodes 4 are alternately arranged as viewed in the stacking direction, and the first internal electrodes 3 and the second internal electrodes 4 sandwich the ceramic layer 2.
- the first internal electrode 3 is drawn out to the first end face 6 of the multilayer body 5, and the second internal electrode 4 is drawn out to the second end face 7 facing the first end face 6 of the multilayer body 5. It is.
- the internal electrodes 3 and 4 contain Ni as a conductive component.
- the multilayer ceramic capacitor 1 also includes first and second external electrodes 8 and 9 formed on the outer surface of the multilayer body 5.
- the first external electrode 8 is formed so as to cover the first end face 6 of the multilayer body 5 and is electrically connected to the first internal electrode 3.
- the second external electrode 9 is formed so as to cover the second end face 7 of the multilayer body 5 and is electrically connected to the second internal electrode 4.
- Each of the external electrodes 8 and 9 includes a conductive layer 10 in contact with the outer surface of the multilayer body 5. Therefore, the conductive layers 10 of the first and second external electrodes 8 and 9 are in contact with the first and second internal electrodes 3 and 4, respectively.
- the detailed composition and forming method of the conductive layer 10 will be described later.
- the conductive layer 10 containing a resin has a single-layer structure, but a further conductive layer containing a resin may be formed on the conductive layer 10.
- each of the external electrodes 8 and 9 further includes a Ni plating layer 11 formed on the conductive layer 10 and a Sn plating layer 12 formed thereon.
- Ni and Sn constituting the plating layers 11 and 12 may be replaced with other metals such as Cu and Au as necessary. Further, either one of the plating layers 11 and 12 may be omitted. Furthermore, the plating layers 11 and 12 may not be formed, and the external electrodes 8 and 9 may be configured only by the conductive layer 10.
- thermosetting resin composition is prepared.
- the thermosetting resin contained in the thermosetting conductive resin composition is preferably selected so that the residual stress after curing is 8 MPa or more.
- thermosetting resin to be used is not particularly limited as long as the residual stress after curing satisfies 8 MPa or more.
- an epoxy resin is used as the main agent
- an alkaline resol type phenol resin or novolac type as the curing agent is used.
- the main epoxy resin is bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, aromatic glycidylamine type epoxy resin, dimer acid modified epoxy resin, urethane modified
- An epoxy resin, a silicon-modified epoxy resin, a chelate-modified epoxy resin, an alicyclic epoxy resin, or a combination thereof can be used.
- thermosetting resin instead of a combination of an epoxy resin and a curing agent, a combination of an isocyanate compound and a polyol or an alkali resol type phenol resin exhibiting a self-polymerization reaction may be used alone as a thermosetting resin.
- thermosetting conductive resin composition described above is applied to the end faces 6 and 7 of the laminate 5 obtained through the firing process. More specifically, for example, by extending a paste-like uncured thermosetting conductive resin composition to a predetermined thickness with a squeegee and immersing each of the end faces 6 and 7 of the laminate 5 therein, An uncured thermosetting conductive resin composition is applied to the end faces 6 and 7 of the laminate 5. The applied thermosetting conductive resin composition is then dried to remove the organic solvent.
- FIG. 2 (1) schematically shows a cross-sectional structure of the thermosetting conductive resin composition 21 that should constitute the conductive layer 10 in a state after drying.
- the thermosetting conductive resin composition 21 is in a state where Cu powder 22 and Sn powder 23 are dispersed in the thermosetting resin 24. At least a part of each of the Cu powder 22 and the Sn powder 23 is in contact with each other.
- the total content of the Cu powder 22 and the Sn powder 23 in the dried thermosetting conductive resin composition 21 is preferably 45 to 65% by volume.
- the D50 of the Cu powder 22 contained in the thermosetting conductive resin composition before curing is 0.5 to 3.0 ⁇ m, and the D50 of the Sn powder 23 is 1.5 to 5.0 ⁇ m. preferable.
- thermosetting conductive resin composition 21 a heat treatment step of the thermosetting conductive resin composition 21 is performed.
- the above-described thermosetting resin 24 is cured, and mutual diffusion proceeds between the Cu powder 22 and the Sn powder 23.
- the thermosetting resin 24 is first cured, and the distance between the Cu powder 22 and the Sn powder 23 is shortened by curing shrinkage, and the contact increases. Subsequently, mutual diffusion proceeds between the Cu powder 22 and the Sn powder 23.
- FIG. 2 (2) a plurality of metal particles 25 containing a Cu 3 Sn alloy are generated.
- thermosetting conductive resin composition 21 has a Sn powder 23 content of 36.5 to the total amount of the Cu powder 22 and the Sn powder 23. Since it is 47.8% by weight, the metal component contained in the metal particles 25 shown in FIG. 2 (2) contains Cu and Sn, and the weight ratio of Sn to the total amount of Sn and Cu is 36.5 to 47.8%.
- the metal particles 25 may contain Cu 6 Sn 5 alloy, Cu 6 Sn 5 alloy, Cu metal and / or Sn metal in addition to Cu 3 Sn alloy. Further, as a result of mutual diffusion, holes may be left in a part of the portion where the Cu powder 22 or the Sn powder 23 is present in the thermosetting resin 24.
- the cured conductive layer 10 is formed.
- the deposition (or ejection) of the metal balls can be suppressed. It is presumed that Cu 3 Sn has a melting point of about 676 ° C. and does not remelt in the heat treatment process.
- a CuSnNi alloy phase is preferably formed in a portion in contact with each of the internal electrodes 3 and 4 and the conductive layer 10.
- FIG. 3 shows the “CuSnNi alloy phase” confirmed by the SEM photograph.
- a “CuSnNi alloy phase” is formed in a portion in contact with the “internal electrode” containing Ni and the conductive layer (portion where “Cu 3 Sn alloy” and “thermosetting resin” exist).
- the CuSnNi alloy phase shows an alloy composition of (Cu, Ni) 6 Sn 5 , and the composition varies depending on the solid solution amount of Ni.
- the amount of Ni solid solution in the alloy phase is preferably 5 to 42 atm%.
- the CuSnNi alloy phase contributes to the improvement of the bondability of the external electrodes 8 and 9 to the internal electrodes 3 and 4. It is presumed that the aforementioned Cu 3 Sn, which is an intermetallic compound that can be generated in the conductive layer 10, is metal-bonded to the internal electrodes 3 and 4 containing Ni, and as a result, a CuSnNi alloy phase is formed.
- the present invention has been described above in relation to the multilayer ceramic capacitor. However, the present invention can also be applied to multilayer ceramic electronic components other than the multilayer ceramic capacitor.
- thermosetting conductive resin composition Cu powder made of spherical particles with D50 of 1.0 ⁇ m, Sn powder made of spherical particles with D50 of 2.5 ⁇ m, and resol type phenol as a thermosetting resin Resin A and diethylene glycol monobutyl ether as an organic solvent were mixed with a small mixer and then kneaded with a three-metal roll. Then, while measuring the viscosity using an E-type viscometer, adjusting the amount of diethylene glycol monobutyl ether as an organic solvent to adjust the viscosity to 1 rpm / 30 ⁇ 2 Pa ⁇ s, an uncured thermosetting sample. Type conductive resin composition was obtained.
- the total content of Cu powder and Sn powder in the thermosetting conductive resin composition was 55% by volume, excluding the organic solvent, but Sn powder relative to the total amount of Sn powder and Cu powder.
- the ratio was changed as shown in the “Sn ratio” column of Table 1.
- the above D50 is a volume-based value measured by a laser diffraction method.
- thermosetting conductive resin composition prepared as described above is stretched to a thickness of 150 ⁇ m with a squeegee, and one end face of the laminate is immersed therein, thereby thermosetting conductive resin.
- the composition was applied, and then dried for 10 minutes at a temperature of 150 ° C. using a hot air circulating oven. Subsequently, the same process was implemented also about the other end surface of the laminated body. Thus, the laminated body to which the thermosetting conductive resin composition was provided to both end surfaces was obtained.
- the laminated body was heat-treated in a nitrogen atmosphere having an actually measured oxygen concentration of less than 10 ppm at a temperature rising rate of 15 ° C./min and kept at a top temperature of 450 ° C. for 20 minutes to obtain a thermosetting conductive
- the functional resin composition was cured.
- a laminated body in which the conductive layer in the external electrode was formed on both end surfaces was obtained.
- thermosetting conductive resin composition on the phosphor bronze plate was dried at a temperature of 150 ° C. for 10 minutes using a hot air drying oven, and then the temperature rising rate was 15 in a nitrogen atmosphere with an actually measured oxygen concentration of less than 10 ppm.
- the thermosetting conductive resin composition was cured by heating at a temperature of °C / min and heat treatment under the condition of keeping the top temperature at 450 ° C. for 20 minutes.
- the thickness of the cured resin film was measured with a micrometer, and the bending amount h of the phosphor bronze plate was measured by image analysis. Further, the Young's modulus of each of the cured resin film and phosphor bronze plate was measured with five samples using a micro hardness meter, and the average value was obtained. And the residual stress value after resin hardening was calculated
- the multilayer ceramic capacitor according to each sample was embedded in a resin and wet-polished to a position (W / 2 position) that was 1/2 of the width direction dimension. Using a SEM, the backscattered electron image was taken at a magnification of 1500 times.
- “x” is displayed in the “Jointability” column of Table 1, and all five CuSnNi alloy phases. Those that could be confirmed were marked with “ ⁇ ” in the same column.
- ⁇ indicates that the capacitance was all within ⁇ 20% of 1.0 ⁇ F, that is, in the range of 0.8 to 1.2 ⁇ F, in 20 samples. In addition, with respect to the dielectric loss tangent, all of the 20 samples were 7.5% or less.
- ⁇ (DF) indicates that the dielectric loss tangent was not higher than 15%, but even one piece was higher than 7.5%.
- the multilayer ceramic capacitor according to each sample is embedded in a resin and wet-polished to a position (W / 2 position) that is 1/2 of the width direction dimension, and then the entire cross section of the exposed conductive layer is subjected to energy dispersion X
- the intensity ratio of Cu and Sn was calculated
- EDX line analysis
- the obtained value coincided with the Sn powder content (“Sn ratio” in Table 1) of the thermosetting conductive resin composition before thermosetting.
- the “Ni ratio of the CuSnNi alloy phase” is preferably 5 to 42 atm% for samples 2 to 6.
- the “residual stress after curing” obtained for the sample 4 showed a value of 10 MPa. From this, it can be inferred that the same “residual stress after curing” can be obtained for the other samples 1 to 3 and 5 to 7 which differ from the sample 4 only in the “Sn ratio”.
- thermosetting conductive resin composition An uncured thermosetting conductive resin composition having the same composition as Sample 4 in Experimental Example 1 was prepared.
- top temperature and the keep time for obtaining the sample 4-2 in Experimental Example 2 are the same as the top temperature and the keep time for obtaining the sample 4 in Experimental Example 1.
- the CuSnNi alloy phase between the internal electrode and the external electrode also tends to be difficult to form. Therefore, in the sample 4-5 in which the Cu 3 Sn alloy ratio was 15% by weight, the “joinability” was evaluated as “ ⁇ ”, but the CuSnNi alloy phase was formed only sparsely. Moreover, the electrical characteristics after the thermal shock test varied. These causes can be estimated to be due to a decrease in the production ratio of the Cu 3 Sn alloy.
- the Cu 3 Sn alloy ratio to the total amount of Sn and Cu contained in the conductive layer to 25% by weight or more as in Samples 4-1 to 4-4, the CuSnNi alloy phase can be sufficiently obtained. It can be estimated that variation in electrical characteristics can be reduced.
- thermosetting conductive resin composition (Experimental example with different thermosetting resin) (1) Preparation of thermosetting conductive resin composition The ratio of Sn powder to the total amount of Sn powder and Cu powder was fixed to 40% by weight. An uncured thermosetting conductive resin composition serving as a sample was obtained through the same operation as in Experimental Example 1 except that the resin shown in the “Type of resin” column was used.
- thermosetting resin not a resol type phenol resin but a combination of a polyfunctional epoxy resin and a novolac type phenol resin was used as the thermosetting resin. Comparing the sample 13 and the sample 14, as the thermosetting resin, the sample 13 uses a combination of a polyfunctional epoxy resin and a novolac type phenol resin D, and the sample 14 uses a polyfunctional epoxy resin and a novolac type phenol resin E. The combination with was used.
- thermosetting resin whose “residual stress after curing” can be 8 MPa or more can reduce variations in initial electrical characteristics.
- thermosetting conductive resin composition (Experimental example in which the metal content after drying was changed) (1) Preparation of thermosetting conductive resin composition The ratio of Sn powder to the total amount of Sn powder and Cu powder was fixed at 40 wt%, and instead, the organic solvent in the thermosetting conductive resin composition The total content of the Cu powder and the Sn powder excluding the sample, that is, the “metal content after drying” was changed as shown in Table 4, and the sample was subjected to the same operation as in Experimental Example 1. An uncured thermosetting conductive resin composition was obtained.
- sample 24 in the experimental example 4 is the same as the sample 4 in the experimental example 1.
- the “metal content after drying” is 40 vol%, 45 vol%, 50 vol%, 55 vol%, 60 vol%, 65 vol% and 70 vol%, respectively.
- the sample 27 having a “metal content after drying” of 70% by volume does not cause a problem in terms of product characteristics. The denseness of was getting worse.
- the sample 21 having a “metal content after drying” of 40% by volume had no problem in terms of product characteristics, but the Ni plating property was deteriorated. This can be presumed to be due to the fact that the metal amount in the conductive layer is insufficient.
- the “metal content after drying” is preferably 45 to 65% by volume.
- thermosetting conductive resin composition (Experimental example in which D50 of Cu powder was changed) (1) Production of thermosetting conductive resin composition The ratio of Sn powder to the total amount of Sn powder and Cu powder was fixed at 40 wt%, and instead, “D50 of Cu powder” is shown in Table 5 Except for the change, the same operation as in Experimental Example 1 was performed to obtain an uncured thermosetting conductive resin composition as a sample.
- Sample 33 in Experimental Example 5 is the same as Sample 4 in Experimental Example 1.
- Example D31 in which “D50 of Cu powder” is 0.3 ⁇ m, 0.5 ⁇ m, 1.0 ⁇ m, 2.0 ⁇ m, 3.0 ⁇ m and 5.0 ⁇ m, respectively
- Samples 32, 33, 34, 35 and 36 good results were obtained in all of “Metal Ball”, “Jointability”, and “Electrical Properties” “Initial” and “After Thermal Shock Test”. It was.
- thermosetting conductive resin composition As the sample 31 with “Cu powder D50” of 0.3 ⁇ m, there is no problem in terms of product characteristics, but since the yield value of the paste of the thermosetting conductive resin composition is high, the thermosetting type When the conductive resin composition was applied to the laminate, it became a “horn” shape.
- “D50 of Cu powder” is preferably in the range of 0.5 to 3.0 ⁇ m.
- thermosetting conductive resin composition (Experimental example in which D50 of Sn powder was changed) (1) Production of thermosetting conductive resin composition The ratio of Sn powder to the total amount of Sn powder and Cu powder was fixed at 40 wt%, and instead, “D50 of Sn powder” is shown in Table 6 Except for the change, the same operation as in Experimental Example 1 was performed to obtain an uncured thermosetting conductive resin composition as a sample.
- sample 42 in the experimental example 6 is the same as the sample 4 in the experimental example 1.
- D50 of Sn powder is preferably in the range of 1.5 to 5.0 ⁇ m.
- thermosetting conductive resin composition (Experimental example with other conditions changed) (1) Preparation of thermosetting conductive resin composition The ratio of Sn powder to the total amount of Sn powder and Cu powder was fixed to 40 wt%. Instead, as shown in Table 7, in sample 51, "Cu An uncured thermosetting conductive resin composition serving as a sample was obtained through the same operation as in Experimental Example 1 except that the “powder shape” was flattened.
- thermosetting conductive resin composition according to Samples 52 and 53 in Experimental Example 7 is the same as the thermosetting conductive resin composition produced in Experimental Example 1.
- Sample 52 a laminate having a planar dimension of 1.6 mm ⁇ 0.8 mm was used as the laminate, as described in “1608” in the “laminate dimensions” column of Table 7.
- the plane size is 1.0 mm ⁇ 0.
- a laminate of 5 mm was used.
- thermosetting conductive resin composition As shown in the column of “Curing Top Temperature” in Table 7, the heat treatment top temperature for curing the thermosetting conductive resin composition was set to 400 ° C. In the other samples 51 and 52, as shown in the column of “curing top temperature” in Table 7, the heat treatment top temperature for curing the thermosetting conductive resin composition was set to 450 as in the case of Experimental Example 1. C.
- thermosetting conductive resin composition (Comparative Experimental Example of Sn Ratio) (1) Production of thermosetting conductive resin composition The ratio of Sn powder to the total amount of Sn powder and Cu powder is in the column of “Sn ratio” in Table 8 according to the ratio described in claim 3 of Patent Document 2. An uncured thermosetting conductive resin composition serving as a sample was obtained through the same operation as in Experimental Example 1 except that it was changed as shown in FIG.
- thermosetting conductive resin composition Formation of conductive layer As shown in the column of “curing top temperature” in Table 8, for samples 62 and 64, the heat treatment top temperature for curing the thermosetting conductive resin composition was 550 ° C. Except that, applying the same conditions as in Experimental Example 1 while applying a thermosetting conductive resin composition to both end faces of the laminate as a component body for a multilayer ceramic capacitor, and by heat treatment, A laminate in which conductive layers in the external electrode were formed on both end surfaces was obtained.
- the “curing top temperature” is, of course, the case of the samples 61 and 63 having a relatively low “curing top temperature” of 450 ° C. Even in the case of Samples 62 and 64 having a comparatively high value of 550 ° C., “Jointability” was “x”, and “Electrical characteristics” of “Initial” was also evaluated as “x (cap / DF)”. . The reason can be assumed to be because the absolute amount of Sn was insufficient.
- thermosetting conductive resin composition Ag powder was used instead of Cu powder, and the ratio of Sn powder to the total amount of Ag powder and Sn powder was defined in claim 3 of Patent Document 2.
- An uncured thermosetting conductive resin composition serving as a sample was obtained through the same operation as in Experimental Example 1 except that it was fixed at 20% by weight, which was the upper limit of the metal ratio on the low melting point side.
- thermosetting conductive resin composition is applied to both end faces of a laminate as a component body for a multilayer ceramic capacitor, and heat treatment is performed, so that a conductive layer in the external electrode is formed on both end faces. A formed laminate was obtained.
- the “joining property” is “ ⁇ ”
- the “electric property” is “initial” and “after the thermal shock test”.
- the rating was “ ⁇ ”. It can be inferred that this is because the “curing top temperature” of 550 ° C. is higher than the melting point (481 ° C.) of the produced Ag 3 Sn and a liquid phase is produced.
- the “metal ball” becomes “NG”, which causes an appearance defect, and there is a concern about practical problems.
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Abstract
Description
(1)熱硬化型導電性樹脂組成物の作製
D50が1.0μmの球状粒子からなるCu粉末と、D50が2.5μmの球状粒子からなるSn粉末と、熱硬化性樹脂としてのレゾール型フェノール樹脂Aと、有機溶剤としてのジエチレングリコールモノブチルエーテルとを、小型ミキサーで混合した後、金属3本ロールで混練した。その後、E型粘度計を用いて粘度測定しながら、有機溶剤としてのジエチレングリコールモノブチルエーテルの量を調整することによって、1rpm/30±2Pa・sに粘度調整された、試料となる未硬化の熱硬化型導電性樹脂組成物を得た。
Niを主成分とする内部電極が形成され、平面寸法が1.0mm×0.5mmであり、静電容量が1μFの積層セラミックコンデンサのための部品本体としての積層体を用意した。
次に、湿式電解バレル法を用いて、上記導通層上に、約2.5±1.5μmの厚みをもってNiめっき層を形成し、次いで、約3.5±1.5μmの厚みをもってSnめっき層を形成した。これによって、試料となる積層セラミックコンデンサを得た。
(4A)硬化後残留応力(リン青銅板法)
平面寸法が10mm×60mmで厚みが200μmのリン青銅板を用意し、このリン青銅板上に、試料となる熱硬化型導電性樹脂組成物を約150μmの厚みで塗布した。
ただし、
F(m,n)=((1-mn2)3×(1+m))+(mn(n+2)+1)3+m(mn2+2n+1)3)/(1+mn)3、 曲率半径ρ[mm]=(4x2+L2)/8x、
x=h/4、
h[mm]:リン青銅板湾曲量、
L[mm]:リン青銅板全長、
E1[GPa]:樹脂ヤング率、
E2[GPa]:リン青銅板ヤング率、
m=E1/E2、
h1[mm]:硬化した樹脂膜の厚み、
h2[mm]:リン青銅板厚み、
n=h1/h2
である。
外部電極における導通層が両端面に形成されためっき前の積層体を各試料につき5個準備し、積層体のいずれか一方の端面上の導通層の中央部を、電界放出型走査電子顕微鏡(FE-SEM)を用いて、二次電子像1000倍で観察した。積層体5個中、1個でも、径10μm以上の金属ボールの噴出が認められたものについては、表1の「金属ボール」の欄に「NG」と表示し、5個すべてで径10μm以上の金属ボールが認められなかったものについては、同欄に「G」と表示した。
試料としての積層セラミックコンデンサから、各試料につき5個の積層セラミックコンデンサを選出した。
上記(4C)において評価した試料について、積層方向での中央位置にある内部電極直上に生成したCuSnNi合金相を、エネルギー分散型X線分析(EDX)を用いて加速電圧10kVで点分析し、CuとSnとNiとの金属組成比を定量し、Ni固溶量を求め、5個の試料についてのNi固溶量の平均値を求めた。
各試料につき、20個の積層セラミックコンデンサを、150℃の温度で60分間熱処理した後、室温で24時間放置した。その後、LCRメータを用い、1MHz、0.5Vrmsの条件で、静電容量(cap)および誘電正接(DF)を測定した。
各試料につき、20個の積層セラミックコンデンサを、150℃の温度で60分間熱処理した後、室温で24時間放置し、次いで、気相式熱衝撃槽に投入し、「室温」→「-55℃で30分間」→「+125℃で30分間」→「室温」で1サイクルとして、500サイクル熱衝撃試験を実施した後、再び、150℃の温度で60分間熱処理した後、室温で24時間放置した。
試料としての積層セラミックコンデンサから、各試料につき5個の積層セラミックコンデンサを選出した。
試料としての積層セラミックコンデンサから、各試料につき3個の積層セラミックコンデンサを選出した。次いで、各試料に係る積層セラミックコンデンサを樹脂包埋して、幅方向寸法の1/2の位置(W/2位置)まで湿式研磨したのち、露出した樹脂電極層の断面全体を、XRDを用いて分析することで、樹脂電極層内に含まれるCuとSnとCu3Sn合金とCu6Sn5合金の強度比を求めた。そして3個の試料についてCu3Sn合金比率の平均値を求めた。得られた値は表1の「Cu3Sn合金比率」の欄に示されている。
「Sn比率」が36.5~47.8重量%の範囲にある試料2~6では、「金属ボール」、「接合性」、および「電気特性」の各評価項目において、好ましい結果が得られた。
(1)熱硬化型導電性樹脂組成物の作製
実験例1における試料4と同様の組成の未硬化の熱硬化型導電性樹脂組成物を作製した。
硬化時のトップ温度およびキープ時間を、表2の「硬化」における「トップ温度」および「キープ温度」にそれぞれ示すように変更したこと以外は、実験例1の場合と同様の操作を経て、外部電極における導通層が両端面に形成された積層体を得た。
実験例1の場合と同様の条件を適用しながら、導通層上に、Niめっき層およびSnめっき層を形成し、試料となる積層セラミックコンデンサを得た。
表2に示すように、各試料について、実験例1の場合と同様の要領で、「金属ボール」、「接合性」、「Cu3Sn合金比率」、ならびに「電気特性」の「初期」および「熱衝撃試験後」を評価した。
硬化時のトップ温度を低くすると、配合したCu粉とSn粉との相互拡散が促進されにくいため、導通層に含まれるSnおよびCuの合計量に対するCu3Sn合金比率が低くなった。
(1)熱硬化型導電性樹脂組成物の作製
Sn粉末およびCu粉末の合計量に対するSn粉末の比率を40重量%に固定し、代わりに、熱硬化性樹脂として、表3の「熱硬化性樹脂の種類」の欄に示したものを用いたことを除いて、実験例1と同様の操作を経て、試料となる未硬化の熱硬化型導電性樹脂組成物を得た。
実験例1と同様の条件を適用しながら、積層セラミックコンデンサのための部品本体としての積層体の両端面に熱硬化型導電性樹脂組成物を付与し、熱処理することによって、外部電極における導通層が両端面に形成された積層体を得た。
実験例1と同様の条件を適用しながら、導通層上に、Niめっき層およびSnめっき層を形成し、試料となる積層セラミックコンデンサを得た。
表3に示すように、実験例1において評価した「硬化後残留応力」、「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」を評価した。
実験例1における試料4では、熱硬化性樹脂として、レゾール型フェノール樹脂Aを用い、表1に示すように、「硬化後残留応力」は10MPaであった。実験例3においては、表3に示すように、試料11では、「熱硬化性樹脂の種類」がレゾール型フェノール樹脂Bであり、「硬化後残留応力」は8MPaであった。これら試料4および11では、「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」のすべてにおいて、良好な結果が得られた。
(1)熱硬化型導電性樹脂組成物の作製
Sn粉末およびCu粉末の合計量に対するSn粉末の比率を40重量%に固定し、代わりに、熱硬化型導電性樹脂組成物中での有機溶剤を除いてのCu粉末とSn粉末との合計含有量、すなわち、「乾燥後の金属含有率」を表4に示すように変えたことを除いて、実験例1と同様の操作を経て、試料となる未硬化の熱硬化型導電性樹脂組成物を得た。
実験例1と同様の条件を適用しながら、積層セラミックコンデンサのための部品本体としての積層体の両端面に熱硬化型導電性樹脂組成物を付与し、熱処理することによって、外部電極における導通層が両端面に形成された積層体を得た。
実験例1と同様の条件を適用しながら、導通層上に、Niめっき層およびSnめっき層を形成し、試料となる積層セラミックコンデンサを得た。
表4に示すように、実験例1において評価した「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」を評価した。
表4に示すように、「乾燥後の金属含有率」が、それぞれ、40体積%、45体積%、50体積%、55体積%、60体積%、65体積%および70体積%である試料21、試料22、試料23、試料24、試料25、試料26および試料27では、「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」のすべてにおいて、良好な結果が得られた。
(1)熱硬化型導電性樹脂組成物の作製
Sn粉末およびCu粉末の合計量に対するSn粉末の比率を40重量%に固定し、代わりに、「Cu粉末のD50」を表5に示すように変えたことを除いて、実験例1と同様の操作を経て、試料となる未硬化の熱硬化型導電性樹脂組成物を得た。
実験例1と同様の条件を適用しながら、積層セラミックコンデンサのための部品本体としての積層体の両端面に熱硬化型導電性樹脂組成物を付与し、熱処理することによって、外部電極における導通層が両端面に形成された積層体を得た。
実験例1と同様の条件を適用しながら、導通層上に、Niめっき層およびSnめっき層を形成し、試料となる積層セラミックコンデンサを得た。
表5に示すように、実験例1において評価した「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」を評価した。
表5に示すように、「Cu粉末のD50」が、それぞれ、0.3μm、0.5μm、1.0μm、2.0μm、3.0μmおよび5.0μmである試料31、試料32、試料33、試料34、試料35および試料36では、「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」のすべてにおいて、良好な結果が得られた。
(1)熱硬化型導電性樹脂組成物の作製
Sn粉末およびCu粉末の合計量に対するSn粉末の比率を40重量%に固定し、代わりに、「Sn粉末のD50」を表6に示すように変えたことを除いて、実験例1と同様の操作を経て、試料となる未硬化の熱硬化型導電性樹脂組成物を得た。
実験例1と同様の条件を適用しながら、積層セラミックコンデンサのための部品本体としての積層体の両端面に熱硬化型導電性樹脂組成物を付与し、熱処理することによって、外部電極における導通層が両端面に形成された積層体を得た。
実験例1と同様の条件を適用しながら、導通層上に、Niめっき層およびSnめっき層を形成し、試料となる積層セラミックコンデンサを得た。
表6に示すように、実験例1において評価した「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」を評価した。
表6に示すように、「Sn粉末のD50」が、それぞれ、0.9μm、1.5μm、2.5μm、5.0μmおよび7.5μmである試料41、試料42、試料43、試料44および試料45では、「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」のすべてにおいて、良好な結果が得られた。
(1)熱硬化型導電性樹脂組成物の作製
Sn粉末およびCu粉末の合計量に対するSn粉末の比率を40重量%に固定し、代わりに、表7に示すように、試料51では、「Cu粉末の形状」を扁平としたことを除いて、実験例1と同様の操作を経て、試料となる未硬化の熱硬化型導電性樹脂組成物を得た。
基本的には、実験例1と同様の条件を適用しながら、積層セラミックコンデンサのための部品本体としての積層体の両端面に熱硬化型導電性樹脂組成物を付与し、熱処理することによって、外部電極における導通層が両端面に形成された積層体を得た。異なる点は以下のとおりである。
実験例1と同様の条件を適用しながら、導通層上に、Niめっき層およびSnめっき層を形成し、試料となる積層セラミックコンデンサを得た。
表7に示すように、実験例1において評価した「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」を評価した。
表7に示すように、試料51~53のいずれにおいても、「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」のすべてについて、良好な結果が得られた。
(1)熱硬化型導電性樹脂組成物の作製
Sn粉末およびCu粉末の合計量に対するSn粉末の比率を、特許文献2の請求項3に記載の比率に従い、表8の「Sn比率」の欄に示すように変えたことを除いて、実験例1と同様の操作を経て、試料となる未硬化の熱硬化型導電性樹脂組成物を得た。
表8の「硬化トップ温度」の欄に示すように、試料62および64については、熱硬化型導電性樹脂組成物の硬化のための熱処理トップ温度を550℃としたことを除いて、実験例1と同様の条件を適用しながら、積層セラミックコンデンサのための部品本体としての積層体の両端面に熱硬化型導電性樹脂組成物を付与し、熱処理することによって、外部電極における導通層が両端面に形成された積層体を得た。
実験例1と同様の条件を適用しながら、導通層上に、Niめっき層およびSnめっき層を形成し、試料となる積層セラミックコンデンサを得た。
表8に示すように、実験例1において評価した「硬化後残留応力」、「金属ボール」「接合性」、および「電気特性」の「初期」を評価した。
表8に示すように、試料61~64では、8MPa以上の「硬化後残留応力」が得られ、「金属ボール」についても「G」の評価が得られた。
(1)熱硬化型導電性樹脂組成物の作製
Cu粉末に代えてAg粉末を用い、かつAg粉末およびSn粉末の合計量に対するSn粉末の比率を、特許文献2の請求項3に規定された低融点側の金属の比率の上限である20重量%に固定したことを除いて、実験例1と同様の操作を経て、試料となる未硬化の熱硬化型導電性樹脂組成物を得た。
表9の「硬化トップ温度」の欄に示すように、熱硬化型導電性樹脂組成物の硬化のための熱処理トップ温度を適用しながら、その他の条件については、実験例1と同様の条件で、積層セラミックコンデンサのための部品本体としての積層体の両端面に熱硬化型導電性樹脂組成物を付与し、熱処理することによって、外部電極における導通層が両端面に形成された積層体を得た。
実験例1と同様の条件を適用しながら、導通層上に、Niめっき層およびSnめっき層を形成し、試料となる積層セラミックコンデンサを得た。
表9に示すように、実験例1において評価した「硬化後残留応力」、「金属ボール」「接合性」、ならびに「電気特性」の「初期」および「熱衝撃試験後」を評価した。
表9に示すように、試料71および72では、8MPa以上の「硬化後残留応力」が得られた。
2 セラミック層
3,4 内部電極
5 積層体
8,9 外部電極
10 導通層
11 Niめっき層
12 Snめっき層
21 熱硬化型導電性樹脂組成物
22 Cu粉末
23 Sn粉末
24 熱硬化性樹脂
25 金属粒子
Claims (7)
- セラミック層と内部電極とが積層された積層体と、
前記内部電極と電気的に接続されるように、前記積層体の外表面上に形成された外部電極と
を備え、
前記外部電極は、前記内部電極に接する導通層を含み、
前記導通層は、Cu3Sn合金を含む金属粒子と熱硬化性樹脂とを含み、
前記金属粒子は、SnおよびCuの合計量に対するSnの重量比が36.5~47.8%であり、
前記内部電極はNiを含む、
積層セラミック電子部品。 - 前記金属粒子に含まれるSnおよびCuの合計量に対するCu3Sn合金比率が25重量%以上である、請求項1に記載の積層セラミック電子部品。
- 前記内部電極と前記導通層とに接する部分には、CuSnNi合金相が形成され、前記合金相中のNi固溶量は5~42atm%である、請求項1または2に記載の積層セラミック電子部品。
- 前記導通層は、Cu粉末とSn粉末と熱硬化性樹脂と有機溶剤とを含み、かつ前記Cu粉末と前記Sn粉末との合計量に対する前記Sn粉末の含有量が36.5~47.8重量%である、熱硬化型導電性樹脂組成物を熱硬化させて得られたものである、請求項1ないし3のいずれかに記載の積層セラミック電子部品。
- 前記熱硬化型導電性樹脂組成物の硬化後の残留応力が8MPa以上である、請求項4に記載の積層セラミック電子部品。
- 前記熱硬化型導電性樹脂組成物中での前記Cu粉末と前記Sn粉末との合計含有量は、前記有機溶剤を除いて、45~65体積%である、請求項4または5に記載の積層セラミック電子部品。
- 前記熱硬化型導電性樹脂組成物の硬化前の状態で、前記Cu粉末のD50は0.5~3.0μmであり、前記Sn粉末のD50は1.5~5.0μmである、請求項4ないし6のいずれかに記載の積層セラミック電子部品。
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020157016121A KR101775914B1 (ko) | 2012-12-18 | 2013-11-23 | 적층 세라믹 전자부품 |
| CN201380066173.7A CN104871271B (zh) | 2012-12-18 | 2013-11-23 | 层叠陶瓷电子部件 |
| JP2014553039A JP6094596B2 (ja) | 2012-12-18 | 2013-11-23 | 積層セラミック電子部品 |
| US14/736,739 US9881737B2 (en) | 2012-12-18 | 2015-06-11 | Laminated ceramic electronic component |
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| JP2018098475A (ja) * | 2016-12-09 | 2018-06-21 | 株式会社村田製作所 | 積層セラミックコンデンサ |
| JP2019091805A (ja) * | 2017-11-15 | 2019-06-13 | 株式会社村田製作所 | 積層セラミックコンデンサ |
| JP2021057455A (ja) * | 2019-09-30 | 2021-04-08 | 太陽誘電株式会社 | コイル部品、回路基板及び電子機器 |
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| JP2019091805A (ja) * | 2017-11-15 | 2019-06-13 | 株式会社村田製作所 | 積層セラミックコンデンサ |
| JP2021057455A (ja) * | 2019-09-30 | 2021-04-08 | 太陽誘電株式会社 | コイル部品、回路基板及び電子機器 |
Also Published As
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|---|---|
| TWI585794B (zh) | 2017-06-01 |
| TW201435941A (zh) | 2014-09-16 |
| WO2014097823A1 (ja) | 2014-06-26 |
| CN104871271A (zh) | 2015-08-26 |
| US9881737B2 (en) | 2018-01-30 |
| TW201440100A (zh) | 2014-10-16 |
| CN104823252B (zh) | 2018-04-06 |
| US20150279566A1 (en) | 2015-10-01 |
| US20150279563A1 (en) | 2015-10-01 |
| US9627133B2 (en) | 2017-04-18 |
| KR20150086342A (ko) | 2015-07-27 |
| JPWO2014097822A1 (ja) | 2017-01-12 |
| CN104871271B (zh) | 2018-04-20 |
| KR101775913B1 (ko) | 2017-09-07 |
| KR101775914B1 (ko) | 2017-09-07 |
| JPWO2014097823A1 (ja) | 2017-01-12 |
| CN104823252A (zh) | 2015-08-05 |
| JP6094597B2 (ja) | 2017-03-15 |
| TWI536412B (zh) | 2016-06-01 |
| JP6094596B2 (ja) | 2017-03-15 |
| KR20150086343A (ko) | 2015-07-27 |
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