Anti-reduction X9R ceramic capacitor dielectric material and preparation method thereof

A technology of ceramic capacitors and dielectric materials, applied in the direction of fixed capacitor dielectrics and components of fixed capacitors, etc., can solve the problems of limited application, decrease of dielectric constant, influence on temperature stability of MLCC, etc., and achieve low cost and high dielectric constant. , the effect of broadening the temperature range

Inactive Publication Date: 2017-12-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the temperature is higher than the Curie temperature (about 120 ~ 130 ° C), the dielectric constant will drop sharply, which will seriously affect the temperature stability of MLCC and limit the application under high temperature conditions.

Method used

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  • Anti-reduction X9R ceramic capacitor dielectric material and preparation method thereof
  • Anti-reduction X9R ceramic capacitor dielectric material and preparation method thereof
  • Anti-reduction X9R ceramic capacitor dielectric material and preparation method thereof

Examples

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Embodiment 1、X9

[0046] Example 1, Preparation and performance testing of X9R type anti-reduction ceramic capacitor dielectric material

[0047] Chemically pure Bi 2 o 3 、Na 2 CO 3 and TiO 2 Weigh and mix according to the molar ratio of 1:1:4, use ethanol as the ball milling medium (according to 1g total raw material: 10ml ethanol), ball mill for 24 hours, dry in a blast drying oven at 70°C for 12 hours, and use a 100-mesh sieve Sieve into a crucible and pre-fire at 900°C for 3h to obtain Bi 0.5 Na 0.5 TiO 3 (Chinese name: sodium bismuth titanate) powder;

[0048] BaTiO with an average particle size of 50 nm 3 (Chinese name: barium titanate) and the obtained sodium bismuth titanate powder were weighed and mixed according to the molar ratio of 9:1, ball milled with deionized water for 24 hours, dried in a blast drying oven at 100°C for 12 hours, and Sieve through a 100-mesh sieve into a crucible, pre-calcine at 1050°C for 8 hours to obtain barium titanate-sodium bismuth titanate (0.90B...

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Abstract

The invention discloses an anti-reduction X9R ceramic capacitor dielectric material and a preparation method thereof. A complex has a molecular formula of 0.90BaTiO3-0.10Bi0.5A0.5TiO3, wherein A represents Na or K. The anti-reduction X9R type ceramic capacitor dielectric material comprises the complex and a secondary dopant. The secondary dopant comprises MnO2, a component A and a component B. The component A is Nb2O5 and/or Ta2O5. The component B is at least one of CeO2, CaZrO3 and MgO. A mass ratio of the secondary dopant to the complex is 0.5 to 2.0: 100. The preparation method comprises mixing the complex and the secondary dopant, carrying out ball milling, drying and sieving to obtain ceramic material powder, tabletting the ceramic material powder, and carrying out sintering in a reducing atmosphere furnace to obtain the anti-reduction X9R ceramic capacitor dielectric material. The dielectric material has good temperature stability, satisfies (delta C/C25) less than or equal to +/-15% at -55 to 200 DEG C and has a high dielectric constant and good reliability. The preparation method has simple processes, realizes a low cost and is harmless for the environment.

Description

technical field [0001] The invention relates to an anti-reduction X9R type ceramic capacitor dielectric material and a preparation method thereof, belonging to the technical field of ceramic materials for electronic components. Background technique [0002] Multilayer Ceramic Capacitors (MLCC for short) are widely used in electronics, communications, aerospace and other fields due to their high capacitance, small size, low cost, high reliability and excellent high-frequency characteristics. One of the widest range of passive electronic components. [0003] According to the EIA standard of the International Electronic Industries Association (EIA), X9R type capacitors are based on the capacitance value at 25°C. In the range of -55 to 200°C, the capacitance change rate (ΔC / C 25 )≤±15%. In the fields of automobiles, oil drilling, aerospace, and military industries, various electronic components involved need to withstand high operating temperatures. For example, the extremely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/64H01G4/12
CPCC04B35/468C04B35/64C04B2235/3201C04B2235/3232C04B2235/3298H01G4/1218H01G4/1227
Inventor 王晓慧沈正波李龙土
Owner TSINGHUA UNIV
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