Preparation method of shell/core nano ceramic dielectric powder material

A technology of nano-ceramics and powder materials, which is applied in the field of preparation of shell/core nano-ceramic dielectric powder materials, can solve the problems of low energy saving and environmental protection, difficult sintering performance of composite systems, etc., achieve excellent dielectric properties, and solve thick film problems. Integrated technical difficulties, high reliability effect

Inactive Publication Date: 2014-04-16
INST OF CHEM CHINESE ACAD OF SCI
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Problems solved by technology

However, these methods are difficult to take into account without losing the sintering performance of the composite system while improving the integrity of the cladding, and are not energy-saving and environmentally friendly.

Method used

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  • Preparation method of shell/core nano ceramic dielectric powder material

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Embodiment 1

[0023] In this embodiment, rhombohedral barium titanate with a particle size of 40 nm is the main crystal phase component, and the shell / core nano-ceramic dielectric powder material is prepared by the following composition and preparation process.

[0024] Double hydrolysis method: prepare 1L aluminum sulfate solution and 1L sodium metaaluminate solution with distilled water, the concentrations are 0.012mol / L and 0.072mol / L respectively. Add 0.51 g of barium titanate nanopowder into the sodium metaaluminate solution, and then ultrasonically disperse for 20 min. Under continuous mechanical stirring, the aluminum sulfate solution was slowly added to the sodium metaaluminate suspension at a rate of 10ml / min, and it could be observed that the dark black sodium metaaluminate suspension gradually changed to light black. After the reaction was completed, the precipitate was centrifuged at 3000 rpm, washed twice with secondary water, dehydrated with ethanol, and dried in air at 80° C....

Embodiment 2

[0027] In this embodiment, lead tungstate with a particle size of 100 nm is used as the main crystal phase component, and the shell / core nano-ceramic dielectric powder material is prepared by the following composition and preparation process.

[0028] Co-precipitation by double hydrolysis: prepare 1L of aluminum sulfate solution and 1L of sodium metaaluminate solution with distilled water, the concentrations are 0.012mol / L and 0.072mol / L respectively. Add 1.48g of lead tungstate nanopowder to the sodium metaaluminate solution, and then ultrasonically disperse for 15min. Under continuous mechanical stirring, the aluminum sulfate solution was slowly added to the sodium metaaluminate suspension at a rate of 10ml / min, and it could be observed that the dark black sodium metaaluminate suspension gradually changed to light black. After the reaction is completed, the precipitate is centrifuged at 3000rpm, washed twice with secondary water, dehydrated with ethanol, and dried in air at ...

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Abstract

The invention relates to a preparation method of a shell / core nano ceramic dielectric powder material. The preparation method comprises the following steps of dispersing nano ceramic powder with a high dielectric constant into a sodium metaaluminate solution; then slowly dropping an aluminum sulfate solution; preparing precursor powder of aluminium hydroxide coated nano ceramic powder through dual hydrolytic precipitation, centrifugal separation, washing and drying; and preparing the nano ceramic dielectric powder material with the shell / core structure that alpha-Al2O3 (the thickness is 10-20nm) is uniformly coated on nano ceramic powder by carrying out high temperature sintering for two times successively. Compared with the traditional liquid phase preparation process, an energy consumption section in the process is saved, so that the time is shortened; and the prepared shell / core nano ceramic dielectric powder material is suitable for manufacturing multi-layered ceramic capacitors or chip type high-capacity ceramic capacitors with high-capacity or ultrathin dielectric layers (the thickness of the dielectric layers is smaller than 3mum).

Description

technical field [0001] The present invention relates to a preparation method of a shell / core nano-ceramic dielectric powder material, in particular to a method for preparing ceramic dielectrics by coating high dielectric coefficient crystals with inorganic powders in all-solid-state multilayer supercapacitors (AS-MLCCs for short). Method for powder materials. Background technique [0002] At present, ultra-thin multilayer ceramic supercapacitors (MLCCs for short) are mostly prepared in the form of alternate parallel lamination of ceramic embryo films and electrodes. With the application and development of MLCCs, it has become the main development direction of a new generation of MLCCs to improve the dielectric coefficient of ceramic materials, improve the insulation performance, and manufacture a thinner (thicker than 3 μm) ceramic dielectric layer in the process. In order to achieve good enough insulation performance, make the dielectric material more resistant to high vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/495C04B35/628
Inventor 刘必前杨海军何敏汪前东任晓灵
Owner INST OF CHEM CHINESE ACAD OF SCI
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