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Low-temperature sintering high-dielectric-property Y5V type ceramic capacitor dielectric material and preparation method thereof

A technology of ceramic capacitors and dielectric materials, which is applied in the field of chemical new functional materials, can solve the problems of component segregation and low dielectric constant of BT-based ceramics, and achieve the effects of low dielectric loss, excellent dielectric properties and cost reduction

Inactive Publication Date: 2018-09-21
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the preparation process of the precipitation method, multiple washings are required, which easily leads to component segregation, and the prepared BT-based ceramics have a low dielectric constant

Method used

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  • Low-temperature sintering high-dielectric-property Y5V type ceramic capacitor dielectric material and preparation method thereof
  • Low-temperature sintering high-dielectric-property Y5V type ceramic capacitor dielectric material and preparation method thereof
  • Low-temperature sintering high-dielectric-property Y5V type ceramic capacitor dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the composition formula:

[0029] Ba(Zr x Ti 1-x )O 3 +A(ZnO+CeO 2 +CuO+MnO 2 +Sm 2 o 3 +Nb 2 o 5 )+yLi 2 o

[0030] y=0.34wt%~1.36wt%,

[0031] Among them, 0.1≤x≤0.3, MnO 2 0.2%, CeO 2 0.15%, Nb 2 o 5 1.2%, ZnO 1.1%, Sm 2 o 3 0.14%, CuO 0.8%.

[0032] The barium zirconate titanate-based powder was synthesized by the sol-gel method, the calcining temperature of the powder was 900°C, (y was 0.34wt%, 0.68%, 1.02%, and 1.36% samples were recorded as #1, # 2. #3 and #4) The specific steps for preparing powder and its ceramic dielectric material are as follows:

[0033] a) Weigh 150g Ti(OBu) according to the stoichiometric ratio 4 , slowly add 15ml of glacial acetic acid and 8ml of absolute ethanol and mix and stir at room temperature to obtain a yellow transparent solution, then add 13.20g of Ba(CH 3COO) 2 , 0.3g Zr(NO 3 ) 4 ·5H 2 O, 0.24 (NO 3 ) 3 ·6H 2 O,0.25gZn(CH 3 COO) 2 2H 2 O,0.08g Cu(CH 3 COO) 2 ·H 2 O and 0.24gMn(CH 3 ...

Embodiment 2

[0038] According to the composition formula:

[0039] Ba(Zr x Ti 1-x )O 3 +yLi 2 o

[0040] Wherein y=0.34wt%~1.36wt%, 0.1≤x≤0.3. Choose x=0.1, y=1.02wt%. The barium zirconate titanate-based powder was synthesized by the sol-gel method. The pre-sintering temperature of the powder was 900°C, and the ceramic sintering temperatures were 1050°C, 1110°C and 1150°C respectively (denoted as #3-1, #3- 2 and #3-3), the specific steps are as follows: Weigh 10.0g main crystal phase powder, 3.0wt% Li 2 CO 3 After adding water, ball mill for 6-12 hours to obtain ceramic powder slurry, and dry the powder slurry at 100° C. to obtain barium zirconate titanate-based powder. The barium zirconate titanate-based powder obtained after ball milling was granulated, and pressed into 8mm discs under a pressure of 6 MPa, and the discs were sintered at different temperatures and held for 2 hours to make ceramics. The ceramic discs were coated with silver paste on both sides and then kept at 600...

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Abstract

The invention discloses a low-temperature sintering high-dielectric-property Y5V type ceramic capacitor dielectric material and a preparation method thereof. Barium zirconate titanate which is prepared by a sol-gel method serves as a main component and is sintered to obtain ceramic with maximum dielectric constant being 15950, heat temperature change rate being -82% to 22%, indoor temperature dielectric loss smaller than 0.5%, and ceramic grain size being 0.8 micrometer to 7.6 micrometers. With sintering aids added, the Y5V type dielectric material having excellent dielectric performance and microscopic structure, high electric constant and low dielectric loss is obtained. The low-temperature sintering high-dielectric-property Y5V type ceramic capacitor dielectric material has the advantages of being environmental friendly and cheap, is suitable to be used for manufacturing high-capacity, small-sized high-performance multi-layer ceramic capacitors, and has wide industrialized application prospect.

Description

technical field [0001] The invention belongs to the technical field of new chemical functional materials, and in particular relates to a low-temperature sintered high-dielectric performance Y5V ceramic capacitor dielectric material and a preparation method thereof. Background technique [0002] In recent years, the miniaturization of mobile electronic devices has led to the gradual development of multilayer ceramic capacitors (MLCCs) in the direction of low cost, miniaturization, and high capacity. It is well known that barium titanate-based ceramics are ferroelectric materials, and Y5V-type BT-based ceramics are widely used in MLCCs due to their high dielectric constant and low dielectric loss. According to the Electronic Industries Association (EIA) standard, Y5V specification capacitance: -82%≤ε-ε25℃ / ε25℃≤22%, the temperature range is -30~85℃). At present, traditional solid-phase method and wet chemical method are mostly used to prepare pure BT powder, and then prepare h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/622
CPCC04B35/49C04B35/622C04B2235/3203C04B2235/3215C04B2235/3224C04B2235/3229C04B2235/3251C04B2235/3267C04B2235/3281C04B2235/3284C04B2235/786
Inventor 崔斌王彦军张小婷靳权
Owner NORTHWEST UNIV
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