阅读说明：本技术 反铁电材料体系的异质堆叠多层陶瓷电容器的制备方法 (Preparation method of heterogeneous stacked multilayer ceramic capacitor of antiferroelectric material system ) 是由 魏猛 张继华 陈宏伟 高丽彬 于 2019-12-06 设计创作，主要内容包括：一种基于反铁电材料体系的异质堆叠多层陶瓷电容器的制备方法,属于电子信息材料与元器件技术领域。首先,分别按照Pb<Sub>(1-1.5x)</Sub>La<Sub>x</Sub>Zr<Sub>(1-y1-z1)</Sub>Sn<Sub>y1</Sub>Ti<Sub>z1</Sub>O<Sub>3</Sub>和Pb<Sub>(1-1.5x)</Sub>La<Sub>x</Sub>Zr<Sub>(1-y2-z2)</Sub>Sn<Sub>y2</Sub>Ti<Sub>z2</Sub>O<Sub>3</Sub>的结构式,称料混料,得到粉料A和B；然后,分别将粉料A和粉料B进行球磨、烘干、预烧、二次球磨、流延,得到单层膜A和单层膜B；将单层膜A和单层膜B按照“AB”或者“ABA”的方式进行复合,作为介质层,丝网印刷金属作为电极层,制备多层陶瓷电容器。本发明得到的多层陶瓷电容器具有界面增强效应,能够有效提高击穿强度和极化强度,进而提高电容器的储能密度。(A preparation method of a heterogeneous stacked multilayer ceramic capacitor based on an antiferroelectric material system belongs to the technical field of electronic information materials and components. First, according to Pb, respectively (1‑1.5x) La x Zr (1‑y1‑z1) Sn y1 Ti z1 O 3 And Pb (1‑1.5x) La x Zr (1‑y2‑z2) Sn y2 Ti z2 O 3 Weighing and mixing the materials to obtain powder A and powder B; then, ball milling, drying, pre-sintering, secondary ball milling and tape casting are respectively carried out on the powder A and the powder B to obtain a single layerFilm a and monolayer film B; and compounding the single-layer film A and the single-layer film B according to an AB or ABA mode to be used as a dielectric layer, and screen-printing metal to be used as an electrode layer to prepare the multilayer ceramic capacitor. The multilayer ceramic capacitor obtained by the invention has an interface enhancement effect, and can effectively improve the breakdown strength and the polarization strength, thereby improving the energy storage density of the capacitor.)

1. A preparation method of a heterogeneous stacked multilayer ceramic capacitor based on an antiferroelectric material system is characterized by comprising the following steps:

step 1, according to Pb_(1-1.5x)La_xZr_(1-y1-z1)Sn_y1Ti_z1O₃Weighing the raw materials, mixing to obtain mixed powder A, and mixing according to Pb_(1-1.5x)La_xZr_(1-y2-z2)Sn_y2Ti_z2O₃Weighing the raw materials, mixing the raw materials to obtain mixed powder B; wherein x is more than or equal to 0.01 and less than or equal to 0.1, and y₁≥0.3，y₂≥0.3，z₁≤0.1，z₂≤0.1；

Step 2, performing ball milling treatment on the mixed powder A and the mixed powder B prepared in the step 1 respectively, and controlling the particle size distribution to accord with normal distribution, wherein D90 is 0.1-10 mu m;

step 3, respectively drying, pre-burning and secondary ball milling the slurry A and the slurry B obtained after ball milling treatment in the step 2, controlling the particle size distribution to accord with normal distribution, wherein D90 is 0.1-10 mu m, and finally drying; the pre-sintering temperature is 800-950 ℃, and the time is 0.5-2 h;

step 4, respectively carrying out tape casting treatment on the powder A and the powder B obtained after the treatment in the step 3 to obtain a single-layer film A and a single-layer film B with the thickness of 0.5-20 microns;

step 5, compounding the single-layer film A and the single-layer film B according to an AB or ABA mode to obtain a composite film AB or ABA; then, taking the composite film AB or the composite film ABA as a dielectric layer, taking screen-printed metal as an electrode layer, and stacking in a mode of 'dielectric layer/(electrode layer/dielectric layer) n' to obtain a multilayer-structure capacitor green body; wherein n is a positive integer greater than 1;

step 6, carrying out warm isostatic pressing treatment on the multilayer structure capacitor green body obtained in the step 5, wherein the temperature is 50-80 ℃, the pressure is 20-200 MPa, and the time is 10-120 min;

and 7, placing the multilayer structure capacitor green body processed in the step 6 in a sintering furnace, sintering for 0.5-2 hours at the temperature of 1000-1200 ℃, naturally cooling to room temperature after sintering, taking out, coating, silver burning and electroplating to obtain the multilayer ceramic capacitor.

2. The method of claim 1 wherein step 1 comprises three conditions: y is₁＝y₂And z is₁≠z₂，z₁＝z₂And y is₁≠y₂，y₁≠y₂And z is₁≠z₂。

3. The method of claim 1, wherein in step 5, adjacent electrode layers of the n electrode layers are staggered, and each electrode layer is spaced from the edge of the dielectric layer by a distance of 1mm or more.

4. The method for preparing a hetero-stacked multilayer ceramic capacitor based on an antiferroelectric material system as claimed in claim 1, wherein in step 5, the thickness of the electrode layer is 0.1-5 μm and the electrode layer is obtained by a screen printing method.

Technical Field

The invention belongs to the technical field of electronic information materials and components, and particularly relates to a preparation method of a multilayer ceramic capacitor of a heterogeneous stacked antiferroelectric material system.

Background

The pulse power capacitor plays an important role in the aspects of electromagnetic cannon, laser ignition, deep well detection and the like. With the development of science and technology, the trend of miniaturization and high power is more and more significant, and particularly, higher and more definite requirements are provided for ship-borne, vehicle-borne, airborne and even satellite-borne pulse power systems.

The traditional lead lanthanum zirconate titanate system has high sedan field strength, high polarization strength, energy storage density up to 4.2J/cc, and capacity of making film of dozens of J/cc, and thus has excellent application foreground. However, the zirconium tin lead lanthanum titanate antiferroelectric material system has piezoelectric property, and certain strain is generated in the charging and discharging process, which is a bottleneck problem that the capacitor fails and the energy storage density cannot be further improved.

Disclosure of Invention

The invention aims to provide a preparation method of a heterogeneous stacked multilayer ceramic capacitor based on an antiferroelectric material system, aiming at the defects in the background art. In the multilayer ceramic capacitor obtained by the invention, a composite structure is introduced, so that an interface effect is formed at the interface of two materials, the effect can play a strain buffering effect, the withstand voltage is enhanced, and the energy storage density is effectively improved.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a preparation method of a heterogeneous stacked multilayer ceramic capacitor based on an antiferroelectric material system is characterized by comprising the following steps:

step 1, according to Pb_(1-1.5x)La_xZr_(1-y1-z1)Sn_y1Ti_z1O₃Weighing the raw materials, mixing to obtain mixed powder A, and mixing according to Pb_(1-1.5x)La_xZr_(1-y2-z2)Sn_y2Ti_z2O₃Weighing the raw materials, mixing the raw materials to obtain mixed powder B; wherein x is more than or equal to 0.01 and less than or equal to 0.1, and y₁≥0.3，y₂≥0.3，z₁≤0.1，z₂≤0.1；

Step 2, performing ball milling treatment on the mixed powder A and the mixed powder B prepared in the step 1 respectively, and controlling the particle size distribution to accord with normal distribution, wherein D90 is 0.1-10 mu m;

step 3, respectively drying, presintering (presintering temperature is 800-950 ℃ and time is 0.5-2 h) and carrying out secondary ball milling treatment on the slurry A and the slurry B obtained after ball milling treatment in the step 2, controlling the particle size distribution to accord with normal distribution, and drying after D90 is 0.1-10 mu m;

step 4, respectively carrying out tape casting treatment on the powder A and the powder B obtained after the treatment in the step 3 to obtain a single-layer film A and a single-layer film B with the thickness of 0.5-20 microns;

step 5, compounding the single-layer film A and the single-layer film B according to an AB or ABA mode to obtain a composite film AB or ABA; then, taking the composite film AB or the composite film ABA as a dielectric layer, taking screen-printed metal as an electrode layer, and stacking in a mode of 'dielectric layer/(electrode layer/dielectric layer) n' to obtain a multilayer-structure capacitor green body; wherein n is a positive integer greater than 1;

step 6, carrying out warm isostatic pressing treatment on the multilayer structure capacitor green body obtained in the step 5, wherein the temperature is 50-80 ℃, the pressure is 20-200 MPa, and the time is 10-120 min;

and 7, placing the multilayer structure capacitor green body processed in the step 6 in a sintering furnace, sintering for 0.5-2 h at the temperature of 1000-1200 ℃, naturally cooling to room temperature after sintering, taking out, coating, silver burning and electroplating to obtain the multilayer ceramic capacitor (the same as the traditional MLCC process).

Further, step 1 includes three cases: y is₁＝y₂And z is₁≠z₂，z₁＝z₂And y is₁≠y₂，y₁≠y₂And z is₁≠z₂。

Further, the formula of the casting in the step 4 comprises powder, PVB glue, a dispersing agent, a defoaming agent and a solvent; the solvent is a mixed solvent of ethanol and toluene, a mixed solvent of isopropanol and toluene, and a mixed solvent of n-butyl alcohol and ethers.

Furthermore, in step 5, adjacent electrode layers in the n electrode layers are arranged in a staggered manner, and a distance of more than 1mm is reserved between each electrode layer and the edge of the dielectric layer so as to prevent breakdown.

Further, in the multilayer ceramic capacitor obtained in step 7, the electrode layers near the left and right sides are connected and led out, respectively, to serve as the two electrodes of the capacitor.

Further, in the step 5, the thickness of the electrode layer is 0.1-5 μm, and the electrode layer is obtained by adopting a screen printing method.

Compared with the prior art, the invention has the beneficial effects that:

according to the preparation method of the heterogeneous stacked multilayer ceramic capacitor based on the antiferroelectric material system, the obtained multilayer ceramic capacitor has an interface enhancement effect (shown in figure 2), and can effectively improve the breakdown strength and the polarization strength, so that the energy storage density of the capacitor is improved. In addition, the method has simple process and good production process compatibility, is beneficial to large-scale industrial production, and can be widely applied to the fields of oil exploration, earthquake evaluation, pulse systems, new concept weapons, laser ignition, micro detonators and the like.

Drawings

FIG. 1 is a flow chart of a method for preparing a heterogeneous stacked multilayer ceramic capacitor based on an antiferroelectric material system according to the present invention;

FIG. 2 is a cross-sectional SEM of the composite film AB obtained in step 5 of example 1 after sintering.

Detailed Description

The technical scheme of the invention is detailed below by combining the accompanying drawings and the embodiment.