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High-dielectric-constant multi-layer ceramic capacitor medium material and preparation method thereof

A technology of dielectric materials and multilayer ceramics, applied in the field of information functional ceramic materials, to achieve the effects of high technical reliability, high dielectric constant, good application and industrialization prospects

Active Publication Date: 2016-11-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to overcome the defects in the performance of existing MLCC ceramics, and the present invention provides a high dielectric constant multilayer ceramic capacitor dielectric material and its preparation method

Method used

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  • High-dielectric-constant multi-layer ceramic capacitor medium material and preparation method thereof
  • High-dielectric-constant multi-layer ceramic capacitor medium material and preparation method thereof
  • High-dielectric-constant multi-layer ceramic capacitor medium material and preparation method thereof

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preparation example Construction

[0028] The invention discloses a high dielectric constant dielectric material for X7R and X8R type multilayer ceramic chip capacitors and a preparation method thereof. The material is Ba 1-y Ca y Ti 1-x Zr x o 3 (0≤x≤0.05,0≤y≤0.05) as base material, its molar content is 80%~96%, and then (Na 0.52 K 0.48 ) 1-m Li m NbO 3 (01-y Ca y Ti 1-x Zr x o 3 -n(Na 0.52 K 0.48 ) 1- mLi m NbO 3 (0.04≤n≤0.2). The preparation method adopted is a solid-phase synthesis method, which mainly includes process steps such as batching, pre-sintering synthesis, ball milling, molding, sintering, and electrode. The temperature characteristics of the dielectric material in the invention meet the requirements of X7R and X8R, the highest dielectric constant at room temperature is ~4000, and the dielectric loss is ~0.8%.

[0029] The Ba 1-y Ca y Ti 1-x Zr x o 3 The matrix material is based on BaCO 3 , CaCO 3 ,TiO 2 and ZrO 2 It is synthesized by high-temperature calcination of r...

Embodiment 1

[0048] First according to the chemical formula Ba 1-y Ca y Ti 1-x Zr x o 3 (x=y=0) Calculate the mass ratio of raw materials, and weigh BaCO respectively with electronic scales 3 (purity 99.76%), TiO 2 (purity 98.81%), using absolute ethanol as a ball milling dispersant, planetary ball milling for 6 hours, after drying, pre-calcining at 1150 ° C for 2 hours to synthesize the base material BaTiO 3 (x=y=0). Then the powder was ball milled for 6 hours, and dried to obtain dry BaTiO 3 Fine powder. According to the chemical formula (Na 0.52 K 0.48 ) 0.94 Li 0.06 NbO 3 (m=0.06) Calculate the mass ratio of raw materials, use the electronic balance scale Na 2 CO 3 (purity 99.8%), K 2 CO 3 (purity 99.0%), Li 2 CO 3 (purity 98.0%), Nb 2 o 5 (purity 99.5%) was mixed ball milled, after drying, pre-calcined at 800° C. for 5 hours, followed by planetary ball milling for 6 hours and high-energy ball milling for 4 hours, and drying to obtain dry fine powder. According to ...

Embodiment 2

[0050] The values ​​of x, y, m, n, sintering temperature, and holding time are shown in Table 1, and the preparation steps and other parameters are the same as in Example 1.

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Abstract

The invention relates to a high-dielectric-constant multi-layer ceramic capacitor medium material and a preparation method thereof. The chemical formula of the medium material is (1-n)Ba1-yCayTi1-xZrxO3-n(Na0.52K0.48)1-mLimNbO3, wherein x is larger than or equal to 0 and smaller than or equal to 0.05, y is larger than or equal to 0 and smaller than or equal to 0.05, m is larger than or equal to 0 and smaller than or equal to 0.06, and n is larger than or equal to 0.04 and smaller than or equal to 0.2. The medium material capable of being used for a multi-layer ceramic capacitor has good temperature stability, high dielectric constant, low dielectric loss and high technical reliability.

Description

technical field [0001] The invention relates to the technical field of information functional ceramic materials, in particular to a high dielectric constant dielectric material applicable to multilayer ceramic capacitors and a preparation method thereof. Background technique [0002] Multilayer ceramic capacitors (MLCC) are mainly used in circuits such as oscillation, coupling, and filtering of various electronic products, and are developing towards miniaturization, large capacity, high voltage, high frequency, and wider temperature environments. There are more and more applications in military electronic equipment such as aerospace and civilian electronic equipment such as mobile communications. In recent years, the demand for MLCC has shown a rapid upward trend along with electronic products, and the requirements for MLCC characteristics have also become diversified and complicated. [0003] The temperature stability of capacitance value is one of the important indicators...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/49C04B35/622
Inventor 李永祥苗纪远刘志甫
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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