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Giant-dielectric ceramic capacitor medium and preparation method thereof

A technology of ceramic capacitors and giant dielectrics, which is applied in the direction of fixed capacitor dielectrics, capacitors, fixed capacitors, etc., can solve the problems of damaging the high dielectric constant characteristics of CCTO ceramics and low dielectric constant, and achieve good performance stability and high dielectric constant. The effect of high and low temperature coefficient

Inactive Publication Date: 2016-09-28
JIANGSU UNIV
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Problems solved by technology

Specifically, these attempts either did not achieve the purpose of reducing the dielectric loss to a sufficient extent, or obviously damaged the original high dielectric constant characteristics of CCTO ceramics, resulting in a very low dielectric constant after modification, or destroyed the original low dielectric constant of CCTO ceramics. The advantage that the dielectric constant of the frequency band basically does not change with the frequency

Method used

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  • Giant-dielectric ceramic capacitor medium and preparation method thereof
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  • Giant-dielectric ceramic capacitor medium and preparation method thereof

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Embodiment Construction

[0017] The present invention is described further in conjunction with embodiment now, and table 1 provides the formula of altogether 4 samples of the embodiment of the present invention.

[0018] The main raw material of the formula of the embodiment of the present invention totally 4 samples adopts ceramic capacitor grade pure, at first adopts conventional chemical raw material to synthesize Ca respectively with solid-phase method during preparation 0.925 Y 0.05 Cu 3 Ti 4 o 12 , (Ba 0.6 Sr 0.4 )TiO 3 、 Bi 2 WO 3 , Ba(Yb 1 / 2 Nb 1 / 2 )O 3 , and then according to the formula ingredients, the prepared material is mixed with dehydrated alcohol using a planetary ball mill ball mill, material: ball: dehydrated alcohol=1:3: (0.6~1.3) (mass ratio), after ball milling for 4~8 hours, Dry powder to obtain dry powder, add polyvinyl alcohol solution with a concentration of 10wt.% accounting for 8-10% of the dry powder to granulate, pass through a 40-mesh sieve after mixing, and t...

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Abstract

The invention relates to the technical field of inorganic nonmetallic materials, and especially relates to a ceramic capacitor medium with giant dielectric and small capacitance temperature change rate. The formula of the medium comprises 91-98wt% of Ca0.925Y0.05Cu3Ti4O12, 0.1-7.0wt% of (Ba0.65Sr0.35)TiO3, 0.01-1wt% of Bi2WO3, 0.1-4wt% of Ba(Yb1 / 2Nb1 / 2)O3, and 0.01-1.8wt% of Co2O3. The leadless and cadmium-free ceramic capacitor medium with giant dielectric and small capacitance temperature change rate is prepared from common chemical raw materials of capacitor ceramic, and the sintering temperature of the capacitor ceramic is also greatly reduced.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a ceramic capacitor medium with a large dielectric and a small capacitance temperature change rate. It uses common chemical raw materials for capacitor ceramics to prepare lead-free, cadmium-free giant dielectrics, ceramic capacitor dielectrics with a small capacitance temperature change rate, and can also reduce the sintering temperature of capacitor ceramics. This medium is suitable for preparing monolithic ceramic capacitors and single-layer capacitors. Chip ceramic capacitors can greatly reduce the cost of ceramic capacitors. The dielectric constant of the dielectric is extremely high, which makes it easy to miniaturize ceramic capacitors. At the same time, it can increase the withstand voltage to expand the application range of ceramic capacitors. polluted environment. Background technique [0002] The high dielectric constant offers the possibility...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/45H01G4/12
CPCC04B35/45C04B35/465C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/3225C04B2235/3232C04B2235/3251C04B2235/3258C04B2235/3275C04B2235/3298H01G4/1227
Inventor 黄新友黄豪左源高春华
Owner JIANGSU UNIV
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