Water-based ceramic slurry, preparation method of ceramic film and chip multilayer ceramic capacitor

A technology of ceramic slurry and ceramic film, applied in capacitors, fixed capacitors, fixed capacitor dielectrics, etc., can solve the problems of poor quality of cast film, and achieve the effect of small film thickness, good mechanical properties and easy operation

Inactive Publication Date: 2020-08-04
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a water-based ceramic slurry, which aims to solve the problem of poor quality of the casting film made by the existing water-based ceramic slurry

Method used

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  • Water-based ceramic slurry, preparation method of ceramic film and chip multilayer ceramic capacitor
  • Water-based ceramic slurry, preparation method of ceramic film and chip multilayer ceramic capacitor
  • Water-based ceramic slurry, preparation method of ceramic film and chip multilayer ceramic capacitor

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Experimental program
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Embodiment approach

[0040] As an embodiment, based on 100 parts of the total weight of the water-based ceramic slurry, the water-based ceramic slurry includes the following components in parts by weight:

[0041]

[0042] Wherein, the pH of the water-based ceramic slurry is 8.

[0043] The cast film with a film thickness of 9.5 μm can be obtained after casting the above water-based ceramic slurry, the surface of the film layer is smooth and dense, and the comprehensive performance is optimal.

[0044] The calculation formula of MLCC capacitance is C=ε×S×(N-1) / d, where ε is the dielectric constant of the dielectric (F / M); S is the area of ​​the internal electrode (m 2 ); N is the number of dielectric layers; d is the thickness (m) of the dielectric layer. It can be seen that the thickness of the dielectric layer is the limiting factor restricting the capacitance performance of MLCC. The thickness of the casting film obtained by casting the above ceramic slurry is less than 10 microns, which me...

Embodiment 1

[0092] This embodiment provides a kind of ceramic thin film for preparing MLCC, and the preparation method of this ceramic thin film specifically comprises the following steps:

[0093] S11, providing ceramic slurry;

[0094] (1) Prepare materials according to the following slurry formula:

[0095]

[0096] Wherein, the pH of the ceramic slurry is 8.

[0097] (2) Preparation of slurry

[0098] Mix barium titanate powder, APC and deionized water, ball mill for 4 hours, use HCl and NH 3 ·H 2 O adjusts the pH value to 8 to obtain the first mixture;

[0099] Polyacrylate, di-n-butyl phthalate and the first mixture were mixed, ball milled for 5 hours and then vacuum degassed for 40 minutes to obtain a ceramic slurry.

[0100] S12. Use a casting machine (BHLY-011A, Beijing Oriental Sun Technology Co., Ltd., China) to prepare a ceramic film, adjust the height of the scraper to 50 microns, the casting line speed to 0.25cm / s, the drying temperature to 40°C, and the drying time ...

Embodiment 21

[0106] This embodiment provides an MLCC, comprising: cutting the ceramic thin film prepared in Step S12 of Embodiment 1 into square sheets of 10mm×10mm, and the number of square sheets is 30; using platinum paste (5570Pt, ESL, USA ) to screen-print the square sheet layer by layer, then stack and laminate (30 layers) at 70 °C and 8 MPa for 0.5 h; finally, perform pressureless sintering at 1100 °C for 0.5 h to obtain dense BaTiO 3 Base MLCC.

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Abstract

The invention belongs to the technical field of ceramic capacitors, and particularly relates to water-based ceramic slurry, a preparation method of a ceramic film and a chip multilayer ceramic capacitor. The water-based ceramic slurry provided by the invention comprises barium titanate powder, polycarboxylate, polyacrylate, phthalate, an antifoaming agent and water according to a specific weight part ratio, wherein water is used as a solvent; polycarboxylate is used as a dispersing agent; polyacrylate is used as a binding agent; phthalate is used as a plasticizer; the components have a synergistic effect, so that the water-based ceramic slurry is endowed with good rheological property, a ceramic film formed by tape casting of the water-based ceramic slurry is smooth and compact in surfaceand good in mechanical property, surface defects such as cracks do not easily occur, and the quality of a ceramic film layer is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic capacitors, and in particular relates to a water-based ceramic slurry, a preparation method of a ceramic film and a chip multilayer ceramic capacitor. Background technique [0002] MLCC (Multi-layer Ceramic Capacitors) is an abbreviation for chip multilayer ceramic capacitors. The ceramic dielectric diaphragms with printed electrodes are stacked in a dislocation manner, and a ceramic chip is formed after a high-temperature sintering, and then a metal layer is encapsulated at both ends of the chip, thus forming a structure similar to a monolith. called a monolithic capacitor. [0003] In recent years, multilayer ceramic capacitors have gradually become one of the largest and fastest-growing chip components in the world. It is a surface mount multilayer ceramic capacitor element made by alternating dielectrics and electrodes. It is used in digital products such as televisions, mobile phones, compu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/632C04B35/634C04B35/626C04B35/622B28B1/29H01G4/12
CPCB28B1/29C04B35/4682C04B35/622C04B35/6263C04B35/632C04B35/634C04B35/63424C04B2235/5409C04B2235/5445C04B2235/5454C04B2235/656C04B2235/6567C04B2235/668H01G4/1227
Inventor 张蕾郭瑞庄后荣于洪宇曾俊王宏兆
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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