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barium titanate-based X8R ceramic material and preparation method and ceramic capacitor thereof

A ceramic material, barium titanate technology, applied in capacitors, fixed capacitors, fixed capacitor dielectrics, etc., can solve the problems of large average grain size of ceramics, unable to adapt to the trend of miniaturization of electronic devices, etc., to achieve good capacitance temperature The effect of stability and uniform particle size

Active Publication Date: 2017-07-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the process steps of this method are simple, the average grain size of the ceramics prepared by sintering is relatively large, which cannot adapt to the trend of miniaturization of electronic devices.

Method used

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  • barium titanate-based X8R ceramic material and preparation method and ceramic capacitor thereof
  • barium titanate-based X8R ceramic material and preparation method and ceramic capacitor thereof
  • barium titanate-based X8R ceramic material and preparation method and ceramic capacitor thereof

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preparation example Construction

[0034] The invention provides a method for preparing a barium titanate-based X8R ceramic material, comprising the following steps: S1) making BaTiO 3 The powder is mixed with a solvent, and subjected to tumbling treatment to obtain a suspension; S2) adding holmium salt, magnesium salt and manganese salt to the suspension and tumbling to obtain a reaction solution; S3) adding ammonia water to the reaction solution The pH value is 9-11, and the precursor is obtained after aging; S4) The precursor is pre-sintered first, and after molding, it is sintered to obtain a barium titanate-based X8R ceramic material.

[0035] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0036] BaTiO 3 The powder is mixed with a solvent, and subjected to rolling treatment to obtain a suspension; the BaTiO 3 The powder is BaTiO well known to those skilled in the art 3 Powder can be used without any special limitation. BaTiO sy...

Embodiment 1

[0048] BaTiO synthesized by hydrothermal method 3 Powder is the raw material, of which Ba 2+ with Ti 4+ The molar ratio is 1.00, and the average particle size is 100nm; analytically pure Ho(NO 3 ) 3 , Mg(CH 3 COO) 2 and Mn(CH 3 COO) 2 For the raw material. First, the nanoscale BaTiO 3 The powder was added to a certain amount of isopropanol solvent and rolled for 5h, in which isopropanol and BaTiO 3 The mass ratio of the powder is 2:1, the diameter of the grinding ball is 3 mm and the mass is 6 times that of the powder, and a well-dispersed and stable suspension is prepared.

[0049] Then press 2.0mol%Ho(NO 3 ) 3 , 3.0mol% Mg(CH 3 COO) 2 , 0.5mol% Mn(CH 3 COO) 2 , Dissolve the doping raw material in a certain amount of deionized water, where Ho 3+ The concentration is 0.0857mol / L, Mg 2+ The concentration is 0.1286mol / L, Mn 2+ The concentration is 0.0214mol / L, and it is added to the suspension for rolling for 2 hours, and ammonia water is slowly added dropwise ...

Embodiment 2

[0077] BaTiO synthesized by hydrothermal method 3 Powder is the raw material, of which Ba 2+ with Ti 4+ The molar ratio is 1.00, and the average particle size is 100nm; analytically pure Ho(NO 3 ) 3 , Mg(CH 3 COO) 2 and Mn(CH 3 COO) 2 For the raw material. First, the nanoscale BaTiO 3 The powder was added to a certain amount of isopropanol solvent and rolled for 5h, in which isopropanol and BaTiO 3 The mass ratio of the powder is 2:1, the diameter of the grinding ball is 3 mm and the mass is 6 times that of the powder, and a well-dispersed and stable suspension is prepared.

[0078] Then press 1.5mol%Ho(NO 3 ) 3 , 4.0mol% Mg(CH 3 COO) 2 , 1.0mol% Mn(CH 3 COO) 2 , Dissolve the doping raw material in a certain amount of deionized water, where Ho 3+ The concentration is 0.0643mol / L, Mg 2+ The concentration is 0.1715mol / L, Mn 2+ The concentration is 0.0428mol / L, and it is added to the suspension for rolling for 2 hours, and ammonia water is slowly added dropwise ...

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Abstract

The invention provides a preparation method of a barium titanate-based X8R ceramic material. The preparation method comprises the following steps that S1, BaTiO3 powder and a solvent are mixed, and barreling processing is performed to obtain a suspension; S2, holmium salt, magnesium salt and manganese salt are added to the suspension for barreling to obtain a reaction solution; S3, ammonia water is added into the reaction solution till the pH value of the reaction solution is 9-11, and a precursor is obtained after aging; S4, the precursor is presintered and formed and then is sintered to obtain the barium titanate-based X8R ceramic material. Compared with the prior art, BaTiO3 is uniformly coated with the holmium oxide, magnesium oxide and manganese oxide by adopting a liquid-phase chemical coating method, so that the barium titanate-based X8R ceramic material is uniform and smaller in particle size and also has better capacitance temperature stability.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a barium titanate-based X8R ceramic material, a preparation method thereof, and a ceramic capacitor. Background technique [0002] With the development of the automotive electronics industry, multilayer ceramic capacitors (MLCC) have been widely used in the field of automotive electronics, such as anti-lock braking system (ABS), fuel injection control module (PGMFI), engine control unit (ECU )Wait. However, these electronic products work at a high temperature. For example, the normal operating temperature of ECU is as high as 130°C, and the temperature can reach 150°C when it is fully loaded. △C / C≤±15%) cannot work stably in such a harsh environment, so the MLCC used in the electronic control unit must have EIAX8R characteristics (-55℃~150℃, △C / C≤±15%). [0003] According to literature reports, one of the keys to obtain temperature-stable X8R capacitors is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622H01G4/12
CPCC04B35/468C04B35/622C04B2235/3206C04B2235/3224C04B2235/3262C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/661H01G4/1227
Inventor 鲁圣国黄咏安姚英邦陶涛梁波
Owner GUANGDONG UNIV OF TECH
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