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Lead-free sodium bismuth titanate-based X9R type ceramic capacitor material and preparation method thereof

A lead-free sodium bismuth titanate-based, ceramic capacitor technology is applied in the application field of electronic ceramics, which can solve problems such as unfavorable environmental protection and human health, and achieve the effects of good industrialization prospects, simple preparation methods, and easy control of reaction conditions.

Inactive Publication Date: 2021-07-02
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most X9R type MLCC ceramic dielectrics are lead-based relaxor ferroelectrics, which are not conducive to environmental protection and human health.

Method used

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  • Lead-free sodium bismuth titanate-based X9R type ceramic capacitor material and preparation method thereof
  • Lead-free sodium bismuth titanate-based X9R type ceramic capacitor material and preparation method thereof
  • Lead-free sodium bismuth titanate-based X9R type ceramic capacitor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) TiO 2 (99%)﹑Bi 2 o 3 (99%), Na 2 CO 3 (99%), BaCO 3 (99.95%), K 2 CO 3 (99%), Ta 2 o 5 (99.5%) raw materials according to chemical formula (1-x) (0.94Na 0.5 Bi 0.5 TiO 3 -0.06BaTiO 3 )-xKTaO 3 The metering ratio ingredients are put into the ball milling tank, zirconia balls and nylon tanks are selected, the mixing ball milling time is 12h, the rotating speed is 300r / min, and the ball milling medium is absolute ethanol.

[0029] (2) The obtained product was dried in an oven at 80°C for 12 hours, and then pre-sintered at 850°C at a rate of 5°C / min for 6 hours.

[0030] (3) Take out the pre-calcined powder and grind it, then use absolute ethanol as the ball milling medium for 12 hours to mix evenly, dry it at 80° C. for 12 hours, and then grind it into a powder.

[0031] (4) Press the uniformly mixed powder into a circular ceramic green body with a diameter of 14 mm and a thickness of 1 mm through a uniaxial tablet press.

[0032] (5) granulate with the ...

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Abstract

The invention discloses a lead-free sodium bismuth titanate-based X9R type ceramic capacitor material and a preparation method thereof, and belongs to the technical field of electronic ceramic application. The chemical formula of the X9R type ceramic capacitor material is 0.7(0.94Na0.5Bi0.5TiO3-0.06BaTiO3)-0.3KTaO3. The preparation method comprises the steps: taking TiO2, Bi2O3, Na2CO3, BaCO3, K2CO3 and Ta2O5 for batching, carrying out ball milling, refining the raw materials, carrying out pre-sintering, secondary ball milling and other processes, and finally preparing the X9R type ceramic capacitor dielectric material by utilizing a solid-phase reaction and carbonate decomposition process. The material can meet the requirement that ([delta]C / C25) of X9R is less than or equal to + / -15% within the temperature range of -55 DEG C to 200 DEG C, has the characteristics of wide working temperature and high stability, and meets wide-temperature field application of electronic component design; the preparation method is simple, easy in reaction condition control, high in repeatability, low in cost, suitable for large-scale production and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramic application, and in particular relates to a lead-free bismuth sodium titanate-based X9R type ceramic capacitor material and a preparation method thereof. Background technique [0002] With the rapid development of contemporary electronics and microelectronics technology, the design of electronic components tends to be miniaturized, high-frequency, integrated and applied in a wide temperature field, requiring ceramic capacitors to have wide temperature stability and low loss. The current multilayer ceramic capacitors (MLCCs) are mostly X7R and X8R types. According to the Class II dielectric standard of the Electronics Industry Association, the upper limit temperatures of these two types of capacitors are 125°C and 150°C respectively. When the operating temperature exceeds At its extreme temperature, it fails because it cannot provide temperature-stable dielectric properties. In the temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/638
CPCC04B35/475C04B35/622C04B35/638C04B2235/3201C04B2235/3215C04B2235/3232C04B2235/3251C04B2235/6562C04B2235/6567
Inventor 汪春昌曹文军李天宇
Owner ANHUI UNIVERSITY
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