A temperature-stable heterogeneous multilayer dielectric ceramic capacitor and its preparation method
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A ceramic capacitor, temperature-stable technology, applied in the direction of laminated capacitors, fixed capacitor dielectrics, fixed capacitor components, etc., can solve the problems of ceramic body delamination, warping, and mismatching sintering characteristics of heterogeneous components, etc., to achieve overcoming mismatch effects
Inactive Publication Date: 2016-01-06
HUBEI UNIV
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[0006] For the co-firing of heterogeneous laminated ceramics, the biggest difficulty at present is the mismatch of sintering characteristics of heterogeneous components, which leads to the problem of delamination and warping of the ceramic body after co-firing
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Embodiment 1
[0042] 1. According to the general formula Ba x Sr 1-x TiO 3 The ratio of the main materials of each layer of A, B, and C, as well as the doping raw materials and burning aids, are weighed in molar ratio, and TiO 2 The molar weight is 0.20mol for calculation and weighing;
[0043] Layer A is Ba 0.9 Sr 0.1 TiO 3 +0.15% La 2 o 3 +0.3%SiO2 2 ,
[0044] Layer B is Ba 0.77 Sr 0.33 TiO 3 +0.15%La 2 o 3 +0.15%Fe 2 o 3 +0.4% SiO 2 ,
[0045] C layer is Ba 0.55 Sr 0.45 TiO 3 +0.15%Fe 2 o 3 +0.8% SiO2 2 ,
[0046] The raw material powder is: BaCO 3 (purity 99.0%), SrCO 3 (purity 99.0%), TiO 2 (purity 98.0%), Fe 2 o 3 , (purity 99.9%) La 2 o 3 (purity 99.99%), SiO 2 (purity 99.0%) powder;
[0047] 2. Weigh the total weight of the powder according to the main materials of each layer of A, B, and C, add deionized water of the same quality, use zirconium balls with diameters of 15mm, 10mm, and 5mm, and a quantity ratio of 1:1:5 to carry out the following ste...
Embodiment 2
[0057] 1. According to the general formula Ba x Sr 1-x TiO 3 And the ratio of the main materials of each layer of A, B, and C, as well as the doping raw materials and burning aids, weighed in molar ratio, and take TiO 2 The molar weight is 0.20mol for calculation and weighing;
[0058] Layer A is Ba 0.92 Sr 0.08 TiO 3 +0.5% Ta 2 o 3 +0.1%Y 2 o 3 +1.2% SiO2 2 ,
[0059] Layer B is Ba 0.73 Sr 0.37 TiO 3 +0.15%Nb 2 o 5 +0.1% Fe 3 o 4 +0.8% SiO2 2 ,
[0060] C layer is Ba 0.55 Sr 0.45 TiO 3 +1.0% Fe 2 o 3 +1.5% SiO2 2 ,
[0061] The raw material powder is: BaCO 3 (purity 99.0%), SrCO 3 (purity 99.0%), TiO 2 (purity 98.0%), Fe 2 o 3 , (purity 99.9%) La 2 o 3 (purity 99.99%), SiO 2 (purity 99.0%) powder;
[0062] 2. Weigh the total weight of the powder according to the main materials of each layer of A, B, and C, add deionized water of the same quality, use zirconium balls with diameters of 15mm, 10mm, and 5mm, and a quantity ratio of 1:1:5 to carr...
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Abstract
The invention provides temperature stable type heterogeneous laminated dielectric medium ceramic capacitors and a production method thereof. The production method comprises enabling barium strontium titanate to be main materials and the general formula to be as follows; adding modified dopant and combustion-supporting materials and dividing into three different main mediums, namely A, B and C, according to different proportions; performing lamination according to combination modes such as AC, ABC, ACA, CAC and ACBCA and laminating in an accumulating or mixing mode under the condition that the thickness of every layer is controlled to be small enough; and pressing, sintering and shearing electrodes to achieve the production of series and parallel heterogeneous laminated dielectric medium ceramic capacitors. Although the temperature stable type heterogeneous laminated dielectric medium ceramic capacitors are formed by the barium strontium titanate, lamination of multilayer with different proportions and different thicknesses is utilized and every layer is corresponding to different dielectric constants, dielectric losses and Curie temperatures, so that the requirements of a capacitor X7R can be met due to adjustment of different thicknesses or layers. At the same time, the electrodes are directly and externally arranged with no inner electrode, so that mismatching of sintering characteristics of an electrode layer and a dielectric layer is effectively overcome and the problems such as ceramic body layering and warping after co-firing caused by the mismatching are solved.
Description
technical field [0001] The multilayer dielectric ceramic capacitor with strontium barium titanate as the main component involved in the present invention, especially a temperature-stable heterogeneous multilayer dielectric ceramic capacitor and its preparation method, the invention meets the requirements of X7R temperature stability, and its stacked The dielectric constant of a layered dielectric ceramic capacitor can be tuned by the thickness ratio of the heterogeneous layers. Background technique [0002] In recent years, with the prominent pollution of lead-containing ceramics, green and environmentally friendly ceramics such as strontium barium titanate series ceramics have attracted much attention because of their high dielectric constant and low dielectric loss, and with the development of electronic technology in recent years, The wide temperature range and high stability requirements of multilayer ceramic capacitors are also developing and changing, so the X7R (based...
Claims
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