Production process of multilayer chip ceramic capacitor

Abstract

The invention relates to the technical field of capacitors, and particularly discloses a production process of a multilayer chip ceramic capacitor. The production process of the multilayer chip ceramic capacitor comprises the following steps: step 1), uniformly mixing clay, diopside, silicon nitride, zirconium oxide whiskers, a solvent and an auxiliary agent to obtain a mixture, and carrying out tape casting on the mixture to form a ceramic film; step 2), printing an electrode on the ceramic thin film to form a prefabricated thin film; the method comprises the steps of (1) preparing a multilayer ceramic capacitor, (2) preparing a multilayer prefabricated film, (3) laminating and cutting the multilayer prefabricated film to form a capacitor blank, (4) discharging glue from the capacitor blank and sintering to obtain a rough capacitor, (5) chamfering and end sealing the rough capacitor to obtain a refined capacitor, and (6) electroplating the refined capacitor to obtain the multilayer ceramic capacitor.

Description

Technical Field

[0001] The invention relates to the field of capacitors, and in particular to a production process of a multilayer chip ceramic capacitor. Background Art

[0002] Multi-Layer Ceramic Capacitor (MLCC) is made of ceramic dielectric diaphragms with printed electrodes (inner electrodes) stacked in a staggered manner, and then sintered at high temperature to form a ceramic chip. Then, metal layers (outer electrodes) are sealed at both ends of the chip to form a monolithic structure. As an important electronic component, MLCC is widely used in communications, automotive electronics, computers and other fields. The traditional MLCC production process mainly includes batching, casting, printing, lamination, cutting, debonding, sintering, chamfering, end-capping, end-firing, electroplating, testing, taping and packaging.

[0003] Although MLCC has been widely used, the existing MLCC still has the defect of poor durability, which makes MLCC prone to failure after a period of use. Once MLCC fails, it will cause more serious damage to the equipment. Therefore, there is still room for improvement. Summary of the invention

[0004] In order to better improve the durability of MLCC, the present application provides a production process for a multilayer chip ceramic capacitor.

[0005] The present application provides a production process for a multilayer ceramic capacitor using the following technical solution: A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), clay, diopside, silicon nitride, zirconium oxide whiskers, solvents, and additives are uniformly mixed to obtain a mixture, and the mixture is tape-cast to form a ceramic film; Step 2), printing electrodes on the ceramic film to form a prefabricated film; Step 3), laminating and cutting the multiple layers of prefabricated films to form a capacitor embryo; Step 4), debinding the capacitor embryo and then sintering it to obtain a rough capacitor; Step 5), chamfering and capping the rough capacitor to obtain a refined capacitor; Step 6), electroplating the refined capacitor to obtain a multi-layer ceramic capacitor.

[0006] By adopting the above technical solution, a special formula made of clay, diopside, silicon nitride and zirconium oxide whiskers is used to make the capacitor structure stable after sintering, and it is not easy to have fine lines, so that the multi-layer chip ceramic capacitor is not easy to fail under long-term high-voltage operation, making the multi-layer chip ceramic capacitor have a longer life, better durability, less likely to damage electronic equipment, and higher economic value.

[0007] Preferably, the mass ratio of the clay, diopside, silicon nitride, zirconium oxide whisker, solvent and additive is 100:12-14:4-6:3-5:10-12:2.9-3.3.

[0008] By adopting the above technical solution and specifically selecting the mass ratio of clay, diopside, silicon nitride and zirconium oxide whiskers, the capacitor structure after sintering is made denser and more stable, and fine lines are better reduced, making the multilayer chip ceramic capacitor more durable and less prone to failure.

[0009] Preferably, the solvent is anhydrous ethanol.

[0010] By adopting the above technical solution and specifically selecting anhydrous ethanol as the solvent, the use of toxic solvents can be reduced, which is more environmentally friendly.

[0011] Preferably, the auxiliary agent is a compound of diethanol monoisopropanolamine and n-octadecyl phosphate.

[0012] By adopting the above technical scheme and specifically selecting the auxiliary agent as a compound of diethanol monoisopropanolamine and octadecyl phosphate, the capacitor performance after sintering is better, the structure is more stable, it is less likely to have fine lines, the durability is better, and it is less likely to fail.

[0013] Preferably, the mass ratio of diethanol monoisopropanolamine to n-octadecyl phosphate is 1.2-1.4:1.7-1.9.

[0014] By adopting the above technical solution and specifically selecting the mass ratio of diethanol monoisopropanolamine and octadecyl phosphate, the capacitor structure after sintering is stabilized, the durability is improved, and the capacitor has a higher economic value.

[0015] Preferably, in step 4), during sintering, the material is first preheated to (270-290)°C for debinding treatment, and then heated to a peak sintering temperature of (1200°C-1250)°C in a nitrogen atmosphere for sintering.

[0016] By adopting the above technical solution, the sintering effect is better, fine lines are less likely to be generated, and the durability of the capacitor is better.

[0017] Preferably, in step 4), the sintering time is (2-3) h.

[0018] By adopting the above technical solution and specifically selecting the sintering time, the sintering is more complete, while energy waste is reduced, which has a higher economic value.

[0019] Preferably, in step 3), the pressure during lamination is (50-100) MPa.

[0020] By adopting the above technical solution and specifically selecting the pressure during lamination, the interlayer structure of the multi-layer prefabricated thin film is made dense and the capacitor quality is higher.

[0021] In summary, this application has the following beneficial effects: 1. Due to the special formula of clay, diopside, silicon nitride and zirconium oxide whiskers in this application, the capacitor structure is stable after sintering and fine lines are not easy to appear, so that the multi-layer chip ceramic capacitor is not easy to fail under long-term high-voltage operation, making the multi-layer chip ceramic capacitor have a longer life, better durability, less likely to damage electronic equipment, and higher economic value.

[0022] 2. In the present application, it is preferred to specifically select the mass ratio of clay, diopside, silicon nitride and zirconium oxide whiskers so that the capacitor structure after sintering is denser and more stable, and fine lines are better reduced, so that the multilayer chip ceramic capacitor has higher durability and is less likely to fail.

[0023] 3. In the present application, the auxiliary agent is preferably selected as a compound of diethanol monoisopropanolamine and octadecyl phosphate, so that the capacitor performance after sintering is better, the structure is more stable, it is less likely to have fine lines, the durability is better, and it is less likely to fail. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with embodiments.

[0025] Example 1 A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), 100kg of clay, 12kg of diopside, 4kg of silicon nitride, 3kg of zirconium oxide whiskers, 10kg of anhydrous ethanol, 1.2kg of diethanol monoisopropanolamine, and 1.7kg of n-octadecyl phosphate are put into a stirring tank, the speed is 60r / min, stirred for 30min, injected into a grinder for grinding, filtered to obtain a mixture with a particle size of ≤1μm, and then the mixture is put into a casting machine to form a ceramic film with a thickness of 20μm through casting.

[0026] Step 2), printing electrodes on the ceramic film by a screen printer, wherein the electrode material is nickel, to form a prefabricated film.

[0027] Step 3), 100 layers of prefabricated films are laminated by a laminator at a pressure of 50 MPa, and then cut by laser cutting to form a capacitor embryo.

[0028] Step 4), preheat the capacitor embryo to 270 ° C for 6 hours, perform debinding treatment, then heat to the peak sintering temperature of 1200 ° C in a nitrogen atmosphere (containing 1% hydrogen) and keep it for 2 hours, and then cool to room temperature at a constant rate of (2-5) ° C / min to obtain a rough capacitor.

[0029] Step 5), the rough capacitor is chamfered with a horizontal planetary chamfering device to remove the burrs on the edges, and then the gap is filled with glue for sealing to obtain a refined capacitor.

[0030] Step 6), electroplating the refined capacitor to obtain a multilayer ceramic capacitor with a rated voltage of 75Vdc, wherein the middle thermal barrier layer has a nickel anode and an electroplating solution of nickel sulfamate, and the outermost solderable layer has a tin anode and an electroplating solution of tin methanesulfonate.

[0031] The glue was purchased from Taizhou Yizhan Electronic Technology Co., Ltd., model number is YZ-5860.

[0032] The clay was purchased from Lingshou County Ningbo Mineral Products Co., Ltd., product name: yellow clay, D50 is 0.5μm-1μm.

[0033] Diopside was purchased from Lingshou County Antai Mining Co., Ltd., with a D50 of 0.5μm-1μm.

[0034] Silicon nitride is commercially available, CAS number: 12033-89-5.

[0035] Zirconia whiskers were purchased from Ningbo Luofei Nanotechnology Co., Ltd.

[0036] Diethanol monoisopropanolamine is commercially available, CAS number: 6712-98-7.

[0037] Octadecanyl phosphate is commercially available, CAS number: 4724-47-4.

[0038] Example 2 A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), 100kg of clay, 13kg of diopside, 5kg of silicon nitride, 4kg of zirconium oxide whiskers, 11kg of anhydrous ethanol, 1.3kg of diethanol monoisopropanolamine, and 1.8kg of n-octadecyl phosphate are put into a stirring tank, the speed is 60r / min, stirring for 30min, injected into a grinder for grinding, filtered to obtain a mixture with a particle size of ≤1μm, and then the mixture is put into a casting machine to form a ceramic film with a thickness of 20μm through casting.

[0039] Step 2), printing electrodes on the ceramic film by a screen printer, wherein the electrode material is nickel, to form a prefabricated film.

[0040] Step 3), 100 layers of prefabricated films are laminated by a laminator at a pressure of 75 MPa, and then cut by laser cutting to form a capacitor embryo.

[0041] Step 4), preheat the capacitor embryo to 280 ° C for 6 hours, perform debinding treatment, then heat to the peak sintering temperature of 1225 ° C in a nitrogen atmosphere (containing 1% hydrogen) and keep it for 2.5 hours, and then cool to room temperature at a constant rate of (2-5) ° C / min to obtain a rough capacitor.

[0042] Step 5), the rough capacitor is chamfered with a horizontal planetary chamfering device to remove the burrs on the edges, and then the gap is filled with glue for sealing to obtain a refined capacitor.

[0043] Step 6), electroplating the refined capacitor to obtain a multilayer ceramic capacitor with a rated voltage of 75Vdc, wherein the middle thermal barrier layer has a nickel anode and an electroplating solution of nickel sulfamate, and the outermost solderable layer has a tin anode and an electroplating solution of tin methanesulfonate.

[0044] The glue was purchased from Taizhou Yizhan Electronic Technology Co., Ltd., model number is YZ-5860.

[0045] The clay was purchased from Lingshou County Ningbo Mineral Products Co., Ltd., product name: yellow clay, D50 is 0.5μm-1μm.

[0046] Diopside was purchased from Lingshou County Antai Mining Co., Ltd., with a D50 of 0.5μm-1μm.

[0047] Silicon nitride is commercially available, CAS number: 12033-89-5.

[0048] Zirconia whiskers were purchased from Ningbo Luofei Nanotechnology Co., Ltd.

[0049] Diethanol monoisopropanolamine is commercially available, CAS number: 6712-98-7.

[0050] Octadecanyl phosphate is commercially available, CAS number: 4724-47-4.

[0051] Example 3 A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), 100kg of clay, 14kg of diopside, 6kg of silicon nitride, 5kg of zirconium oxide whiskers, 12kg of anhydrous ethanol, 1.4kg of diethanol monoisopropanolamine, and 1.9kg of n-octadecyl phosphate are put into a stirring tank, the speed is 60r / min, stirred for 30min, injected into a grinder for grinding, filtered to obtain a mixture with a particle size of ≤1μm, and then the mixture is put into a casting machine to form a ceramic film with a thickness of 20μm through casting.

[0052] Step 2), printing electrodes on the ceramic film by a screen printer, wherein the electrode material is nickel, to form a prefabricated film.

[0053] Step 3), 100 layers of prefabricated films are laminated by a laminator at a pressure of 100 MPa, and then cut by laser cutting to form a capacitor embryo.

[0054] Step 4), preheat the capacitor embryo to 290 ° C for 6 hours, perform debinding treatment, then heat to the peak sintering temperature of 1250 ° C in a nitrogen atmosphere (containing 1% hydrogen) and keep it for 3 hours, and then cool to room temperature at a constant rate of (2-5) ° C / min to obtain a rough capacitor.

[0055] Step 5), the rough capacitor is chamfered with a horizontal planetary chamfering device to remove the burrs on the edges, and then the gap is filled with glue for sealing to obtain a refined capacitor.

[0056] Step 6), electroplating the refined capacitor to obtain a multilayer ceramic capacitor with a rated voltage of 75Vdc, wherein the middle thermal barrier layer has a nickel anode and an electroplating solution of nickel sulfamate, and the outermost solderable layer has a tin anode and an electroplating solution of tin methanesulfonate.

[0057] The glue was purchased from Taizhou Yizhan Electronic Technology Co., Ltd., model number is YZ-5860.

[0058] The clay was purchased from Lingshou County Ningbo Mineral Products Co., Ltd., product name: yellow clay, D50 is 0.5μm-1μm.

[0059] Diopside was purchased from Lingshou County Antai Mining Co., Ltd., with a D50 of 0.5μm-1μm.

[0060] Silicon nitride is commercially available, CAS number: 12033-89-5.

[0061] Zirconia whiskers were purchased from Ningbo Luofei Nanotechnology Co., Ltd.

[0062] Diethanol monoisopropanolamine is commercially available, CAS number: 6712-98-7.

[0063] Octadecanyl phosphate is commercially available, CAS number: 4724-47-4.

[0064] Comparative Example 1 A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), 100kg clay, 13kg calcite, 5kg silicon nitride, 4kg zirconium oxide whisker, 11kg anhydrous ethanol, 1.3kg diethanol monoisopropanolamine, 1.8kg octadecyl phosphate are put into a stirred tank, the speed is 60r / min, stirring for 30min, injected into a grinder for grinding, filtered to obtain a mixture with a particle size of ≤1μm, and then the mixture is put into a casting machine to form a ceramic film with a thickness of 20μm through casting.

[0065] Step 2), printing electrodes on the ceramic film by a screen printer, wherein the electrode material is nickel, to form a prefabricated film.

[0066] Step 3), 100 layers of prefabricated films are laminated by a laminator at a pressure of 60 MPa, and then cut by laser cutting to form a capacitor embryo.

[0067] Step 4), preheat the capacitor embryo to 280 ° C for 6 hours, perform debinding treatment, then heat to the peak sintering temperature of 1225 ° C in a nitrogen atmosphere (containing 1% hydrogen) and keep it for 2.5 hours, and then cool to room temperature at a constant rate of (2-5) ° C / min to obtain a rough capacitor.

[0068] Step 5), the rough capacitor is chamfered with a horizontal planetary chamfering device to remove the burrs on the edges, and then the gap is filled with glue for sealing to obtain a refined capacitor.

[0069] Step 6), electroplating the refined capacitor to obtain a multilayer ceramic capacitor with a rated voltage of 75Vdc, wherein the middle thermal barrier layer has a nickel anode and an electroplating solution of nickel sulfamate, and the outermost solderable layer has a tin anode and an electroplating solution of tin methanesulfonate.

[0070] The glue was purchased from Taizhou Yizhan Electronic Technology Co., Ltd., model number is YZ-5860.

[0071] The clay was purchased from Lingshou County Ningbo Mineral Products Co., Ltd., product name: yellow clay, D50 is 0.5μm-1μm.

[0072] Diopside was purchased from Lingshou County Antai Mining Co., Ltd., with a D50 of 0.5μm-1μm.

[0073] Silicon nitride is commercially available, CAS number: 12033-89-5.

[0074] Zirconia whiskers were purchased from Ningbo Luofei Nanotechnology Co., Ltd.

[0075] Diethanol monoisopropanolamine is commercially available, CAS number: 6712-98-7.

[0076] Octadecanyl phosphate is commercially available, CAS number: 4724-47-4.

[0077] Comparative Example 2 A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), 100kg clay, 13kg diopside, 5kg dolomite, 4kg zirconium oxide whisker, 11kg anhydrous ethanol, 1.3kg diethanol monoisopropanolamine, 1.8kg octadecyl phosphate are put into a stirred tank, the speed is 60r / min, stirred for 30min, injected into a grinder for grinding, filtered to obtain a mixture with a particle size of ≤1μm, and then the mixture is put into a casting machine to form a ceramic film with a thickness of 20μm through casting.

[0078] Step 2), printing electrodes on the ceramic film by a screen printer, wherein the electrode material is nickel, to form a prefabricated film.

[0079] Step 3), 100 layers of prefabricated films are laminated by a laminator at a pressure of 60 MPa, and then cut by laser cutting to form a capacitor embryo.

[0080] Step 4), preheat the capacitor embryo to 280 ° C for 6 hours, perform debinding treatment, then heat to the peak sintering temperature of 1225 ° C in a nitrogen atmosphere (containing 1% hydrogen) and keep it for 2.5 hours, and then cool to room temperature at a constant rate of (2-5) ° C / min to obtain a rough capacitor.

[0081] Step 5), the rough capacitor is chamfered with a horizontal planetary chamfering device to remove the burrs on the edges, and then the gap is filled with glue for sealing to obtain a refined capacitor.

[0082] Step 6), electroplating the refined capacitor to obtain a multilayer ceramic capacitor with a rated voltage of 75Vdc, wherein the middle thermal barrier layer has a nickel anode and an electroplating solution of nickel sulfamate, and the outermost solderable layer has a tin anode and an electroplating solution of tin methanesulfonate.

[0083] The glue was purchased from Taizhou Yizhan Electronic Technology Co., Ltd., model number is YZ-5860.

[0084] The clay was purchased from Lingshou County Ningbo Mineral Products Co., Ltd., product name: yellow clay, D50 is 0.5μm-1μm.

[0085] Diopside was purchased from Lingshou County Antai Mining Co., Ltd., with a D50 of 0.5μm-1μm.

[0086] The dolomite was purchased from Lingshou County Rongyu Mineral Products Co., Ltd., with a D50 of 0.5μm-1μm.

[0087] Zirconia whiskers were purchased from Ningbo Luofei Nanotechnology Co., Ltd.

[0088] Diethanol monoisopropanolamine is commercially available, CAS number: 6712-98-7.

[0089] Octadecanyl phosphate is commercially available, CAS number: 4724-47-4.

[0090] Comparative Example 3 A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), 100kg of clay, 13kg of diopside, 5kg of silicon nitride, 4kg of wollastonite, 11kg of anhydrous ethanol, 1.3kg of diethanol monoisopropanolamine, and 1.8kg of n-octadecyl phosphate are put into a stirring tank at a speed of 60r / min, stirred for 30min, injected into a grinder for grinding, filtered to obtain a mixture with a particle size of ≤1μm, and then the mixture is put into a casting machine to form a ceramic film with a thickness of 20μm through casting.

[0091] Step 2), printing electrodes on the ceramic film by a screen printer, wherein the electrode material is nickel, to form a prefabricated film.

[0092] Step 3), 100 layers of prefabricated films are laminated by a laminator at a pressure of 60 MPa, and then cut by laser cutting to form a capacitor embryo.

[0093] Step 4), preheat the capacitor embryo to 280 ° C for 6 hours, perform debinding treatment, then heat to the peak sintering temperature of 1225 ° C in a nitrogen atmosphere (containing 1% hydrogen) and keep it for 2.5 hours, and then cool to room temperature at a constant rate of (2-5) ° C / min to obtain a rough capacitor.

[0094] Step 5), the rough capacitor is chamfered with a horizontal planetary chamfering device to remove the burrs on the edges, and then the gap is filled with glue for sealing to obtain a refined capacitor.

[0095] Step 6), electroplating the refined capacitor to obtain a multilayer ceramic capacitor with a rated voltage of 75Vdc, wherein the middle thermal barrier layer has a nickel anode and an electroplating solution of nickel sulfamate, and the outermost solderable layer has a tin anode and an electroplating solution of tin methanesulfonate.

[0096] The glue was purchased from Taizhou Yizhan Electronic Technology Co., Ltd., model number is YZ-5860.

[0097] The clay was purchased from Lingshou County Ningbo Mineral Products Co., Ltd., product name: yellow clay, D50 is 0.5μm-1μm.

[0098] Diopside was purchased from Lingshou County Antai Mining Co., Ltd., with a D50 of 0.5μm-1μm.

[0099] Silicon nitride is commercially available, CAS number: 12033-89-5.

[0100] Wollastonite was purchased from Shifeng Mining Processing Plant in Lingshou County. The needle-shaped wollastonite powder had a D50 of 0.5μm-1μm.

[0101] Diethanol monoisopropanolamine is commercially available, CAS number: 6712-98-7.

[0102] Octadecanyl phosphate is commercially available, CAS number: 4724-47-4.

[0103] Comparative Example 4 A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), 100kg of clay, 13kg of diopside, 5kg of silicon nitride, 4kg of zirconium oxide whiskers, 11kg of anhydrous ethanol, 1.3kg of sodium dodecylbenzenesulfonate, and 1.8kg of n-octadecyl phosphate are put into a stirring kettle, the speed is 60r / min, stirring for 30min, injected into a grinder for grinding, filtered to obtain a mixture with a particle size of ≤1μm, and then the mixture is put into a casting machine to form a ceramic film with a thickness of 20μm through casting.

[0104] Step 2), printing electrodes on the ceramic film by a screen printer, wherein the electrode material is nickel, to form a prefabricated film.

[0105] Step 3), 100 layers of prefabricated films are laminated by a laminator at a pressure of 60 MPa, and then cut by laser cutting to form a capacitor embryo.

[0106] Step 4), preheat the capacitor embryo to 280 ° C for 6 hours, perform debinding treatment, then heat to the peak sintering temperature of 1225 ° C in a nitrogen atmosphere (containing 1% hydrogen) and keep it for 2.5 hours, and then cool to room temperature at a constant rate of (2-5) ° C / min to obtain a rough capacitor.

[0107] Step 5), the rough capacitor is chamfered with a horizontal planetary chamfering device to remove the burrs on the edges, and then the gap is filled with glue for sealing to obtain a refined capacitor.

[0108] Step 6), electroplating the refined capacitor to obtain a multilayer ceramic capacitor with a rated voltage of 75Vdc, wherein the middle thermal barrier layer has a nickel anode and an electroplating solution of nickel sulfamate, and the outermost solderable layer has a tin anode and an electroplating solution of tin methanesulfonate.

[0109] The glue was purchased from Taizhou Yizhan Electronic Technology Co., Ltd., model number is YZ-5860.

[0110] The clay was purchased from Lingshou County Ningbo Mineral Products Co., Ltd., product name: yellow clay, D50 is 0.5μm-1μm.

[0111] Diopside was purchased from Lingshou County Antai Mining Co., Ltd., with a D50 of 0.5μm-1μm.

[0112] Silicon nitride is commercially available, CAS number: 12033-89-5.

[0113] Zirconia whiskers were purchased from Ningbo Luofei Nanotechnology Co., Ltd.

[0114] Sodium dodecylbenzenesulfonate is commercially available, CAS number: 25155-30-0.

[0115] Octadecanyl phosphate is commercially available, CAS number: 4724-47-4.

[0116] Comparative Example 5 A production process for a multilayer ceramic capacitor comprises the following steps: Step 1), 100kg of clay, 13kg of diopside, 5kg of silicon nitride, 4kg of zirconium oxide whiskers, 11kg of anhydrous ethanol, 1.3kg of diethanol monoisopropanolamine, and 1.8kg of hexadecyltrimethylammonium bromide are put into a stirring kettle at a speed of 60r / min, stirred for 30min, injected into a grinder for grinding, filtered to obtain a mixture with a particle size of ≤1μm, and then the mixture is put into a casting machine to form a ceramic film with a thickness of 20μm through casting.

[0117] Step 2), printing electrodes on the ceramic film by a screen printer, wherein the electrode material is nickel, to form a prefabricated film.

[0118] Step 3), 100 layers of prefabricated films are laminated by a laminator at a pressure of 60 MPa, and then cut by laser cutting to form a capacitor embryo.

[0119] Step 4), preheat the capacitor embryo to 280 ° C for 6 hours, perform debinding treatment, then heat to the peak sintering temperature of 1225 ° C in a nitrogen atmosphere (containing 1% hydrogen) and keep it for 2.5 hours, and then cool to room temperature at a constant rate of (2-5) ° C / min to obtain a rough capacitor.

[0120] Step 5), the rough capacitor is chamfered with a horizontal planetary chamfering device to remove the burrs on the edges, and then the gap is filled with glue for sealing to obtain a refined capacitor.

[0121] Step 6), electroplating the refined capacitor to obtain a multilayer ceramic capacitor with a rated voltage of 75Vdc, wherein the middle thermal barrier layer has a nickel anode and an electroplating solution of nickel sulfamate, and the outermost solderable layer has a tin anode and an electroplating solution of tin methanesulfonate.

[0122] The glue was purchased from Taizhou Yizhan Electronic Technology Co., Ltd., model number is YZ-5860.

[0123] The clay was purchased from Lingshou County Ningbo Mineral Products Co., Ltd., product name: yellow clay, D50 is 0.5μm-1μm.

[0124] Diopside was purchased from Lingshou County Antai Mining Co., Ltd., with a D50 of 0.5μm-1μm.

[0125] Silicon nitride is commercially available, CAS number: 12033-89-5.

[0126] Zirconia whiskers were purchased from Ningbo Luofei Nanotechnology Co., Ltd.

[0127] Diethanol monoisopropanolamine is commercially available, CAS number: 6712-98-7.

[0128] Hexadecyltrimethylammonium bromide is commercially available, CAS number: 57-09-0.

[0129] Experiment 1 1000 multilayer chip ceramic capacitors of each embodiment and comparative example were welded on a HALT board and tested in an aging box with a constant temperature of 200°C and a test voltage of 1.5 times the rated voltage. The capacitors were operated continuously for 2000 hours. The number of failed 1000 multilayer chip ceramic capacitors in each embodiment and comparative example was counted, and the failure ratio was calculated.

[0130] The specific test data of Experiment 1 are shown in Table 1.

[0131] Table 1 According to the data comparison of each embodiment and the comparative example in Table 1, the failure rate of each embodiment is significantly lower than that of each comparative example. It can be seen that each embodiment can make the sintered ceramic structure denser and more stable by adding diopside, silicon nitride, zirconium oxide whiskers, diethanol monoisopropanolamine, and octadecyl phosphate to clay, and is less likely to have fine lines, so that it can maintain stability well under high temperature, high humidity, and high voltage overload scenarios, is less likely to fail, has better quality, is not easy to damage electronic equipment, and has higher economic value.

[0132] However, each comparative example destroyed the composite system of diopside, silicon nitride, zirconium oxide whiskers, diethanol monoisopropanolamine, octadecyl phosphate and clay, causing the sintered ceramics to be more prone to fine lines, and the stability of the capacitors produced to decrease, resulting in failure under overload and a significant decrease in quality.

[0133] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A production process for a multilayer ceramic capacitor, characterized in that: The following steps are involved: Step 1), clay, diopside, silicon nitride, zirconium oxide whiskers, solvents, and additives are uniformly mixed to obtain a mixture, and the mixture is tape-cast to form a ceramic film; Step 2), printing electrodes on the ceramic film to form a prefabricated film; Step 3), laminating and cutting the multiple layers of prefabricated films to form a capacitor embryo; Step 4), the capacitor embryo is first debonded and then sintered to obtain a rough capacitor; Step 5), chamfering and capping the rough capacitor to obtain a refined capacitor; Step 6) electroplate the refined capacitor to obtain a multi-layer ceramic capacitor.

2. The production process of a multilayer ceramic capacitor according to claim 1, characterized in that: The mass ratio of the clay, diopside, silicon nitride, zirconium oxide whisker, solvent and additive is 100:12-14:4-6:3-5:10-12:2.9-3.

3.

3. The production process of a multilayer ceramic capacitor according to claim 2, characterized in that: The solvent is anhydrous ethanol.

4. The production process of a multilayer ceramic capacitor according to claim 3, characterized in that: The auxiliary agent is a compound of diethanol monoisopropanolamine and n-octadecyl phosphate.

5. The production process of a multilayer ceramic capacitor according to claim 4, characterized in that: The mass ratio of diethanol monoisopropanolamine to n-octadecyl phosphate is 1.2-1.4:1.7-1.

9.

6. The production process of a multilayer ceramic capacitor according to claim 1, characterized in that: In the step 4), during sintering, the material is first preheated to (270-290)°C for debinding treatment, and then heated to a peak sintering temperature of (1200°C-1250)°C in a nitrogen atmosphere for sintering.

7. The production process of a multilayer ceramic capacitor according to claim 6, characterized in that: In the step 4), the sintering time is (2-3) h.

8. The production process of a multilayer ceramic capacitor according to claim 1, characterized in that: In the step 3), the pressure during lamination is (50-100) MPa.

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