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Dielectric material for multilayer ceramic capacitor with medium-high voltage X7R characteristics

A technology of dielectric materials and multilayer ceramics, which is applied in the direction of fixed capacitor dielectrics, laminated capacitors, capacitors, etc., can solve the problems of low dielectric constant, difficulty in miniaturization, large capacity, and inability to improve withstand voltage and reliability, etc. problem, achieve high insulation resistance, good temperature stability and high reliability

Active Publication Date: 2017-05-31
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dielectric ceramic composition disclosed in Japanese Patent 2007-255591, 2007-255598, 2007-319812 is suitable for the high medium and high voltage capacitor of rated voltage; but the dielectric constant of the dielectric ceramic composition recorded in the literature is too low (small 500 ), it is difficult to miniaturize and increase the capacity; it is impossible to improve the withstand voltage and reliability under the miniaturization and large capacity

Method used

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  • Dielectric material for multilayer ceramic capacitor with medium-high voltage X7R characteristics
  • Dielectric material for multilayer ceramic capacitor with medium-high voltage X7R characteristics
  • Dielectric material for multilayer ceramic capacitor with medium-high voltage X7R characteristics

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preparation example Construction

[0049] The preparation process of dielectric material in the embodiment is:

[0050] First, the main component barium yttrium titanate (Ba 1-a Y a ) b TiO 3 ; Next, mixing auxiliary additive components and calcining at 500-800°C; then calcined powder, MgTiO 3 Added to (Ba 1-a Y a ) b TiO 3 , mixed together, dispersed, and dried to obtain MLCC dielectric materials.

[0051] Then the above-mentioned obtained dielectric material is made into a slurry, and the slurry is made into a dielectric green diaphragm through a casting machine, and nickel or nickel alloy electrodes are printed on the surface of the diaphragm by a screen printing machine, and then the diaphragm is laminated according to the number of layers designed and printing internal electrodes; alternately stack and print the dielectric films of the internal electrodes to form a laminate; then undergo isostatic pressing and cutting to form a green body, and sinter the green body in a reducing atmosphere at 1260-...

Embodiment 1

[0053] First, the solid-phase method was used to prepare (Ba 1-a Y a ) b TiO 3 powder (see figure 1 ); Next, the MnCO 3 , SiO 2 、Ho 2 o 3 , V 2 o 5 powders (with a particle size below 0.3 microns) were mixed, and calcined at 650°C for 2 hours to obtain powders with an average particle size of 0.2-0.3 microns; then, the calcined powder, MgTiO 3 Added to (Ba 1-a Y a ) b TiO 3 , mixed together, dispersed, and dried to obtain MLCC dielectric materials.

Embodiment 2-30

[0055] The preparation process is the same as in Example 1, except that the addition amount of each component is different. The addition amount of each composition is as shown in table 1, and in each embodiment, as shown in the table, the medium material (the embodiment number is the sample number) that preparation addition amount is different, in table 1, the addition amount of each composition is relative to 100 Moore (Ba 1-a Y a ) b TiO 3 converted. Among the materials, (Ba1-aYa)bTiO with a=0.02 and b=1.02 is used 3 .

[0056] Table 1: Specific components and proportions of dielectric materials

[0057]

[0058]

[0059] Note, * means the addition amount is 0.

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Abstract

The invention provides a dielectric material for a multilayer ceramic capacitor with medium-high voltage X7R characteristics. The dielectric material is prepared from the following components: 100mol of (Ba<1-a>Y)TiO<3>, 0.2-1.0mol of MgTiO3, 0.05-0.5mol of oxide selected from Mn, Cr, Co and Fe, 0.2-1.0mol of oxide selected from Ca, Si, Li, AL and B, 1.0-4.0mol of oxide selected from Ho, Yb, Gd, Dy, Sm and E and 0-0.3mol of oxide selected from W, Mo and V. The (Ba<1-a>Y)TiO<3> produced by a low-cost solid-phase method is taken as a main raw material, and the dielectric material with anti-reductive X7R characteristics, which is sintered at 1260-1320 DEG C, is obtained through an optimization process and a formula under the common action of various auxiliary ingredients. The dielectric material is suitable for a medium-high voltage multi-layer ceramic capacitor of which the thickness of a dielectric layer is greater than 8 microns and the rated voltage is greater than 100V, and is good in temperature stability, high in insulation resistance, high in withstand voltage and high in reliability.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a dielectric material of a ceramic capacitor and a preparation method thereof. Background technique [0002] Multilayer Ceramic Capacitors (MLCC for short) have the characteristics of high specific volume, high reliability, high withstand voltage, and good frequency characteristics. They are widely used in the fields of electronic information, computers, automatic control, and communications. electronic devices. With the development of electronic equipment and components in the direction of miniature, thin layer, hybrid integration and the rapid development of integrated circuit surface mount technology, the demand for high-performance MLCC is increasing day by day. [0003] In recent years, capacitor dielectric materials that can use cheap base metals such as nickel and copper as internal electrodes have been developed, which has greatly reduced the cost. Among them,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468H01G4/12H01G4/30
CPCC04B35/4682C04B2235/3224C04B2235/3225C04B2235/3236C04B2235/3239C04B2235/3262C04B2235/3418H01G4/1209H01G4/30
Inventor 陈世纯张兵司留启张莹
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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