Middle-temperature sintering high temperature stabilization type ceramic capacitor dielectric material

A ceramic capacitor, high-temperature stable technology, applied in ceramics, inorganic insulators, etc., can solve the problems of inability to use low-Pd inner electrode slurry and high sintering temperature, and achieve simple and adjustable formula, low firing temperature and good uniformity Effect

Inactive Publication Date: 2007-09-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sintering temperature of this system is high, and the dielectric m...

Method used

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  • Middle-temperature sintering high temperature stabilization type ceramic capacitor dielectric material
  • Middle-temperature sintering high temperature stabilization type ceramic capacitor dielectric material
  • Middle-temperature sintering high temperature stabilization type ceramic capacitor dielectric material

Examples

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preparation example Construction

[0061] The invention provides the first additive, a preparation method (processing method 1) of glass-ceramic, comprising the following steps:

[0062] 1) According to the stoichiometric ratio, weigh calcium, boron, magnesium, phosphorus and zinc compounds respectively and dissolve them in concentrated nitric acid to obtain solution A. Compound; The "stoichiometric ratio" mentioned here refers to the ratio of calcium compound, boron compound, magnesium compound, phosphorus compound and zinc compound calculated according to the requirements of glass composition for Ca, B, Mg, P and Zn content. This point can be deduced completely based on the component requirements of the product.

[0063] 2) Measure tetraethyl orthosilicate, stabilizer, and absolute ethanol in proportion and mix them uniformly to form solution B;

[0064] 3) Heat and evaporate solution A at 65-95°C. When the volume ratio of solution A to solution B is: solution A / solution B=1.0-2.5, mix solution A and solutio...

Embodiment 1

[0082] Example 1: (Comparison of different composition A when the solid-phase dopant is XBS) Process method 3 was used to prepare the dielectric material of ultra-fine medium-temperature sintered temperature-stable multilayer ceramic capacitor. First according to 97.5wt% BaTiO 3 (average particle size 0.5μm), 0.8wt% Nb 2 o 5 , 0.9wt% ZnO, 0.2wt% CBS, 0.6wt% CeO 2Proportional weighing. Then add the solid phase dopant XBS with different composition A, accounting for 1.2wt% of the above mixture. After the obtained sample was dried, it was mixed with 5wt% PVA and granulated, and pressed under a pressure of 10 MPa to form a disc with a diameter of 10 mm and a thickness of 1 mm, and then placed in the air for sintering at a temperature of 1140° C. for 2.5 hours. The heating rate is 3°C / min, and the furnace is cooled. The dielectric properties of the obtained ceramic samples are shown in Table 1. Figures 1 and 2 show the ε-T curves and ΔC curves when the composition A of the soli...

Embodiment 2

[0084] Example 2: (Comparison of different Nb2O5 dosages when the solid-phase dopant composition A is fixed) Process method 3 was used to prepare the dielectric material of ultra-fine medium-temperature sintered temperature-stable multilayer ceramic capacitor. First according to 97.4wt% BaTiO 3 (average particle size is 0.4μm), 0.9wt% ZnO, 0.2wt% CBS, 0.5wt% Nd 2 o 3 , 1.0wt% ZBS (at this time, A in XBS is Zn, so ZBS is called for short here) proportioning and weighing. Then add different mass percentages of Nb 2 o 5 , accounting for 1.4wt%, 2.2wt%, 3.0wt% of the above-mentioned mixture respectively. After the obtained sample was dried, it was mixed with 5wt% PVA and granulated, and pressed under a pressure of 10 MPa to form a disc with a diameter of 10 mm and a thickness of 1 mm, and then placed in the air for sintering at a temperature of 1100° C. for 2.5 hours. The heating rate is 3°C / min, and the furnace is cooled. The dielectric properties of the obtained ceramic sam...

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Abstract

This invention relates to a mid-temperature calcined and high temperature stabilized ceramic medium material of capacitors composed of barium titanate main material, a first additive, a second additive and a third additive, in which, the first additive is a microcrystal glass, the second additive includes lead-free piezoelectric material bismuth titanate sodium or boron silicate and the third additive includes: a rare earth oxide, ZnO and Nb2O5, and said rare earth oxide includes Ce or Nd oxide. Advantage: batch production is realized to basic materials and dopants so as to simplify the production process.

Description

technical field [0001] The invention relates to electronic material technology, in particular to capacitor material technology. Background technique [0002] Multilayer Ceramic Capacitors (MLCC) for short. It stacks the electrode material and the ceramic body alternately and in parallel in multiple layers, and simultaneously fires them as a whole. According to the Electronic Industries Association (EIA) standard, the X7R type MLCC refers to the temperature range of -55 ~ 125 ℃, the capacity temperature change rate (TCC) <± 15%, and the dielectric loss (DF) ≤ 2.0 %. X7R MLCC has good temperature stability (-55~125℃, ΔC / C≤±15%), and has been widely used in coupling circuits of electronic equipment such as personal computers and mobile communications. However, in recent years, many electronic circuits that work at temperatures exceeding 125°C also require the use of MLCCs to achieve miniaturization. For example, vehicle-mounted electronic systems such as ABS (anti-death ...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/462C04B35/50C03C10/04C03C10/14H01B3/12
Inventor 周晓华唐彬袁颖张树人钟朝位
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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