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Synthesis method for preparing perovskite series ceramic nano-powder body with texture lamellar structure

A nano-powder and synthesis method technology, which is applied in the field of ultra-fine powder preparation, can solve the problems of complex process, unfavorable process control and batch production, and achieve the effects of simplifying the process, realizing mass production, and narrowing the size distribution range

Inactive Publication Date: 2011-06-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The perovskite-based textured ceramics with preferred orientation prepared by template grain growth technology have improved piezoelectric properties, but the process is relatively complicated, which is not conducive to process control and mass production.
At present, the work in this area is still in its infancy. How to simplify the process is a problem that needs to be solved by grain orientation technology.

Method used

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  • Synthesis method for preparing perovskite series ceramic nano-powder body with texture lamellar structure
  • Synthesis method for preparing perovskite series ceramic nano-powder body with texture lamellar structure
  • Synthesis method for preparing perovskite series ceramic nano-powder body with texture lamellar structure

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preparation example Construction

[0022] The invention provides a method for preparing perovskite-based ceramic nano powders with a textured layered structure, which has simple process, low cost, convenient operation and easy control of the preparation process. The method is to disperse the intermediate raw material and hydroxide synthesized by the solid phase reaction method into an organic solvent as a slurry bottom liquid under normal pressure, add metal alkoxide, and then dry the obtained slurry liquid , In the above process steps, adjustments and deletions can be made according to different types of perovskites or different intermediates, and ceramic powders with a layered structure but with ordinary perovskite compositions can be directly prepared.

[0023] The synthesized ceramic powder is formed by in-situ growth on the layered intermediate raw material powder, so it has a layered structure and a perovskite composition.

[0024] The synthesized powder with a layered structure can directly prepare a per...

Embodiment 1

[0027] 23.97 g TiO 2 and 93.12 g Bi 2 o 3 Mixing, ball milling, and pre-calcination at 780°C, the reaction produces the intermediate raw material Bi 4 Ti 3 o 12 Powder, 5.8 g Bi 4 Ti 3 o 12The powder is dispersed into absolute ethanol as the base liquid A. Add 0.8 g of NaOH into liquid A, grind it to fully dissolve to obtain liquid B. Dissolve 8.5 g of tetrabutyl titanate into 50 ml of absolute ethanol as liquid C. Slowly add liquid C to liquid B. During the whole process, the mixing reaction temperature must be kept within the temperature range from room temperature to 100 ° C, and at the same time, it must be ground vigorously to make it fully react, so as to facilitate the control of powder properties. After the reaction was finished, filter with suction. Dry the solid part at 60-70°C to obtain Na 0.5 Bi 0.5 TiO 3 Powder. The XRD results show that the obtained powder is a fine powder with a layered perovskite structure. From the SEM photos, the finished prod...

Embodiment 2

[0029] The hydroxide in embodiment 1 is changed to 1.12 gram KOH, other conditions are constant, obtained the K with layered perovskite structure 0.5 Bi 0.5 TiO 3 Powder.

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Abstract

The present invention belongs to the technological field of the preparation of ultra-fine powder and relates to a direct synthetic method that is used for preparing perovskite ceramic nano powder with texture layer structure. In the method, under the conditions of atmospheric pressure, the raw material of the intermediate that is synthesized in the method of solid phase reaction and hydroxide aredispersed in an organic solvent to be used as basic solution of pulpous state; metal ionic alkoxide is added; then the prepared solution of the pulpous state is dried to prepare the nano ceramic powder. The synthetic method requires no high-temperature sintering and can be used for preparing the ceramic powder with layered structure, grains of 30 to 45nm, high sintering activity, and uniform and controllable ingredients. Under the conditions of dry-pressure formation and no-pressure sintering, the ceramic powder can be used for preparing the perovskite texture ceramics, which has preferred orientation of grains. Thus the ceramic powder greatly improves the ferroelectric, piezoelectric and dielectric properties of the perovskite ceramics.

Description

technical field [0001] The invention belongs to the technical field of superfine powder preparation. In particular, it relates to a method for preparing perovskite-based ceramic nano-powders with a textured layered structure, which is synthesized by a direct synthesis method. Background technique [0002] With its unique electromechanical coupling effect, piezoelectric ceramics are widely used in various fields of human production and life such as electronic technology, communication, medicine, and military affairs. The piezoelectric ceramics currently used are mainly PZT-based piezoelectric ceramic systems, which have a series of excellent properties, but because they contain a large amount of harmful substance lead, this type of ceramics will be emitted during preparation, use and disposal. Toxic substances, which are obviously contrary to the requirements of human development and environmental protection. Therefore, the development of high-performance lead-free piezoele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/626C04B35/465
Inventor 齐建全杜鹏孙黎马振伟李龙土
Owner TSINGHUA UNIV
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