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Dielectric ceramic material with high-temperature stability and preparation method thereof

A technology of dielectric ceramics and stability, which is applied in the field of dielectric ceramic materials with high temperature stability and its preparation. It can solve the problems that temperature stability cannot meet the requirements of multilayer ceramic capacitors, and achieve good market prospects and low prices. , the effect of excellent dielectric temperature stability

Active Publication Date: 2011-04-27
无锡隆傲电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the temperature stability (±15%) of X7R dielectric ceramics widely used in mobile communication products, notebook computers, aviation instruments, etc. can no longer meet the requirements of multilayer ceramic capacitors (MLCC) and current and magnetic field interference (EMI) filters. Requirements

Method used

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  • Dielectric ceramic material with high-temperature stability and preparation method thereof
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  • Dielectric ceramic material with high-temperature stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The dielectric ceramic material with high temperature stability of the present invention is prepared as follows:

[0033] (1) The selected raw materials have a main content greater than 98.5%.

[0034] (2) Calculate the basic material formula according to the following molar ratio:

[0035] BaCO 3 :TiO 2 = 1:1, for the preparation of BaTiO 3 ;

[0036] SrCO 3 :TiO 2 = 1:1, for the preparation of SrTiO 3 ;

[0037] PbO:TiO 2 = 1:1, for the preparation of PbTiO 3 ;

[0038] Bi 2 o 3 : nTiO 2 = 1:n, for the preparation of Bi 2 o 3 · nTiO 2 (n=1~5);

[0039] CaCO 3 : ZrO 2 = 1:1, for the preparation of CaZrO 3 ;

[0040] (3) The raw materials of the basic materials calculated and weighed in step (2) will be processed according to the following process requirements:

[0041] (A) Wet ball milling: ball milling time = 12 hours.

[0042] (B) discharging and dehydration by pressure filtration.

[0043] (C) Drying: keep at 120°C for 12 hours.

[0044] (D) B...

Embodiment 2

[0073] The dielectric ceramic material with high temperature stability of the present invention is prepared as follows:

[0074] (1) The selected raw materials have a main content greater than 98.5%.

[0075] (2) Calculate the basic material formula according to the following molar ratio:

[0076] BaCO 3 :TiO 2 = 1:1, for the preparation of BaTiO 3 ;

[0077] SrCO 3 :TiO 2 = 1:1, for the preparation of SrTiO 3 ;

[0078] PbO:TiO 2 = 1:1, for the preparation of PbTiO 3 ;

[0079] Bi 2 o 3 : nTiO 2 = 1:n, for the preparation of Bi 2 o 3 · nTiO 2 (n=1~5);

[0080] CaCO 3 : ZrO 2 = 1:1, for the preparation of CaZrO 3 ;

[0081] (3) The raw materials of the basic materials calculated and weighed in step (2) will be processed according to the following process requirements:

[0082] (A) Wet ball milling: ball milling time = 12 hours.

[0083] (B) discharging and dehydration by pressure filtration.

[0084] (C) Drying: keep at 120°C for 12 hours.

[0085] (D)...

Embodiment 3

[0113] The dielectric ceramic material with high temperature stability of the present invention is prepared as follows:

[0114] (1) The selected raw materials have a main content greater than 98.5%.

[0115] (2) Calculate the basic material formula according to the following molar ratio:

[0116] BaCO 3 :TiO 2 = 1:1, for the preparation of BaTiO 3 ;

[0117] SrCO 3 : TiO 2 = 1:1, for the preparation of SrTiO 3 ;

[0118] PbO:TiO 2 = 1:1, for the preparation of PbTiO 3 ;

[0119] Bi 2 o 3 : nTiO 2 = 1:n, for the preparation of Bi 2 o 3 · nTiO 2 (n=1~5);

[0120] CaCO 3 : ZrO 2 = 1:1, for the preparation of CaZrO 3 ;

[0121] (3) The raw materials of the basic materials calculated and weighed in step (2) will be processed according to the following process requirements:

[0122] (A) Wet ball milling: ball milling time = 12 hours.

[0123] (B) discharging and dehydration by pressure filtration.

[0124] (C) Drying: keep at 120°C for 12 hours.

[0125] (D) ...

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Abstract

The invention belongs to the field of capacitor dielectric material preparation and relates to a dielectric ceramic material with high-temperature stability and a preparation method thereof. The preparation method comprises the following steps of: pre-synthesizing base materials including barium titanate (BaTiO3), strontium titanate (SrTiO3), lead titanate (PbTiO3), calcium zirconate (CaZrO3) andBi2O3.nTiO2 by using barium carbonate (BaCO3), strontium carbonate (SrCO3), calcium carbonate (CaCO3), lead oxide (PbO), bismuth trioxide (Bi2O3), zirconium oxide (ZrO2) and titanium oxide (TiO2) as raw materials and by a solid-phase synthesis process, wherein n is 1 to 5; according to a proportioning requirement, mixing the base materials and auxiliary additives including magnesium oxide (MgO) and manganese carbonate (MnCO3) and performing resynthesis by the solid-phase synthesis process; and then preparing the dielectric ceramic material with high-temperature stability by the preparation process of the conventional dielectric ceramic material. According to detection, a ceramic capacitor manufactured by the dielectric ceramic material has the electrical characteristics that: the temperature change rate, namely absolute value of delta epsilon / epsilon25, is less than or equal to 5 percent (between 25 DEG C below zero and 85 DEG C); the dielectric constant epsilon25 is more than or equal to 1,000; the tangent tg delta of a loss angle is less than or equal to 1 percent; and the breakdown voltage VBDC is more than or equal to 10 KV / mm.

Description

technical field [0001] The invention relates to the technical field of dielectric ceramic materials, in particular to a dielectric ceramic material with high temperature stability and a preparation method thereof. Background technique [0002] Today, with the rapid development of electronic technology, passive components are increasingly developing in the direction of miniaturization, multi-function, high reliability and low cost. However, the quality basis of all passive components is no more than the quality level of the corresponding functional ceramics and the degree of quality control in the manufacturing process. Therefore, the production of high-quality functional ceramics is the primary goal of all passive component manufacturers. [0003] As the foundation of the modern electronics industry, as an important and main branch of passive components, ceramic dielectric capacitors have always occupied a dominant position in the capacitor industry due to their small size, ...

Claims

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Application Information

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IPC IPC(8): C04B35/49C04B35/622
Inventor 吴纪梁吴迪居涌
Owner 无锡隆傲电子有限公司
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