Environment-coordinating method for preparing titanate piezoelectric ceramic powder

A piezoelectric ceramic and titanate technology, which is applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of expensive and impractical chelating agents, lack of practical value, and difficulty in preparing sols, etc. problems, to achieve the effect of high density, high complexation efficiency and easy operation

Inactive Publication Date: 2013-01-30
CHINA WEST NORMAL UNIVERSITY
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Problems solved by technology

However, because water is a highly polar substance, most organic chelating agents are insoluble in water, or it is difficult to effectively complete the complexation of metal ions in a strong polar solvent, or the chelating agent is expensive and impractical; Although the found citrate method can effectively complex metal ions under aqueous conditions, the powder prepared by the process is rough and easy to agglomerate, and the effect is far from that of the alcohol-based sol-gel method. Therefore, even though it has research value, it does not have practical value
In addition, the titanium sources of titanate compounds are mainly titanium dioxide, titanyl sulfate, titanium chloride, tetrabutyl titanate, etc., although the price is in balance, they are either insoluble in water, or they are rapidly hydrolyzed when exposed to water to generate hydrogen Titanium oxide, and then hydrolyzed into titanium dioxide, it is difficult to prepare sol
Therefore, the key to breaking through the water-based sol-gel process is to find a special chelating agent, which needs to have both: hydrophilicity, pro-titanium source, can directional inhibit the hydrolysis of titanium source, and effectively complete the complexation of various metal ions , cheap and practical, environmentally friendly, easy to operate, and high-quality products, this is an insurmountable barrier for the choice of water-based chelating agents. Looking at many research results in the world, there has been no water-based sol- Gel technology gets any breakthrough progress

Method used

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  • Environment-coordinating method for preparing titanate piezoelectric ceramic powder
  • Environment-coordinating method for preparing titanate piezoelectric ceramic powder
  • Environment-coordinating method for preparing titanate piezoelectric ceramic powder

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Specific embodiment 1 of the present invention, water-based sol-gel method prepares Bi 0.5 (Na 0.7 K 0.2 Li 0.1 ) 0.5 TiO 3 (BNKLT for short) The steps of nano powder and piezoelectric ceramics are as follows:

[0054] (1) The sol concentration is C sol-gel-Ti 4+ =0.15~0.25mol / L, 20 grams of sample (based on the mass of the final product BNKLT);

[0055] (2) After accurate stoichiometry, take 10.98 grams of Bi 2 o 3 (purity 99.8%) was dissolved in 45ml of concentrated nitric acid and dissolved, until it was colorless, clear and transparent, then cooled, and then 1.75 grams of Na 2 CO 3 (purity 99.8%), 0.66 g K 2 CO 3 (purity 99.0%), 0.18 g Li 2 CO 3 (purity 97.0%) aqueous solution was added thereinto to obtain liquid A;

[0056] (3) According to the ratio of the amount of lactic acid to tetrabutyl titanate is 2.0~6.0, take 50ml lactic acid (purity 85~90%) and add 32.49 grams of tetrabutyl titanate (purity 98.5%, density ≈ 1.0) After fully stirring, add 5...

specific Embodiment 2

[0064] Specific embodiment 2 of the present invention, water-based sol-gel method prepares CeO 2 -[0.998Bi 0.5 (Na 0.7 K 0.2 Li 0.1 ) 0.5 TiO 3 -0.002BiFeO 3 ] (Abbreviation: C-BNKLT-BF) The steps of nano powder and piezoelectric ceramics are as follows:

[0065] (1) The sol concentration is C sol-gel-Ti 4+ =0.15~0.25mol / L, 20 grams of sample (based on the mass of the final product C-BNKLT-BF);

[0066] (2) After accurate stoichiometry, 0.20 g of CeO 2 (99.0% purity) and 10.88 grams of Bi 2 o 3 (purity 99.8%) were dissolved in 10ml and 45ml concentrated nitric acid respectively and heat-promoted, to CeO 2 A very small amount of hydrogen peroxide was added dropwise to the mixture, and fully boiled until it was colorless, clear and transparent, then cooled, then 0.08 grams of ferric nitrate nonahydrate (purity 98.5%), 1.73 grams of Na 2 CO 3 (purity 99.8%), 0.65 g K 2 CO 3 (purity 99.0%), 0.18 g Li 2 CO 3 (purity 97.0%) aqueous solution was added thereinto to o...

Embodiment 3

[0075] Specific embodiment 3 of the present invention, water-based sol-gel method prepares [0.94 Bi 0.5 (Na 0.7 K 0.2 Li 0.1 ) 0.5 TiO 3 -0.06BaTiO 3 ]-BiFeO 3 (abbreviated 0.94BNKLT-0.06BT-BF) the steps are as follows:

[0076] (1) The sol concentration is C sol-gel-Ti 4+ =0.15~0.25mol / L, 20 grams of sample (based on the mass of the final product 0.94BNKLT-0.06BT-BF);

[0077] (2) After accurate stoichiometry, to 1.11 g BaCO 3 (purity 99.8%) was added to 5ml of water, and then concentrated nitric acid was added dropwise to it until it was just clear, colorless and transparent, and 10.27 grams of Bi 2 o 3 (purity 99.8%) was dissolved in 45ml concentrated nitric acid and heat-promoted until it was colorless, clear and transparent, then cooled, mixed the above two liquids, and then mixed 0.08 grams of ferric nitrate nonahydrate (purity 98.5%), 1.60 grams of Na 2 CO 3 (purity 99.8%), 0.61 g K 2 CO 3 (purity 99.0%), 0.17 g Li 2 CO 3 (purity 97.0%) aqueous solution...

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Abstract

The invention discloses an environment-coordinating method for preparing titanate piezoelectric ceramic powder, and the method is characterized in that lactic acid is chelating agent, swelling agent and pore-forming agent, sol is prepared under the normal temperature by utilizing a sol-gel method, after the pH value is adjusted, the sol is vacuum concentrated or removed with solvent under constant pressure to obtain gel, the gel is processed through unique swelling process and spontaneous combustion way under the temperature of 180 DEG C to 200 DEG C to obtain a nano pyrophoric material, and the pyrophoric material is pre-burned to obtain nano powder under the temperature of 550DEG C to 600DEG C; and the powder is processed through procedures such as granulating, tabletting, plastic releasing and the like to obtain a green sheet, the green sheet is sintered for 1 to 2h under the condition of 950DEG C to 1025DEG C to obtain a ceramic sheet, and the ceramic sheet is polarized in normal-temperature silicon oil to obtain the titanate piezoelectric ceramic powder after standing. The method has important practical significance for traditional piezoelectric ceramic production process to realize high quality, low energy consumption, low cost and environmental friendliness; and meanwhile, an important innovation effect for the titanate compound application field seeking no conglobation and having ultra-large specific surface area can be achieved.

Description

technical field [0001] The invention relates to a technology for preparing titanate piezoelectric ceramic powder, in particular to a technology for preparing titanate compound non-agglomerated nanometer powder by a water-based sol-gel method. It belongs to the field of functional materials and the production of nano-powders with green and environment-friendly technology. Background technique [0002] From the discovery of titanate piezoelectric ceramic materials to the present, the traditional solid-phase synthesis method has been used in industrial production, but the process has insurmountable disadvantages: the composition is difficult to be uniform, the ball mill also introduces impurities and the equipment damage rate is high, and the rough Micron-sized particles, 850°C~900°C powder pre-sintering temperature, 1100°C~1300°C high-temperature ceramic sintering, and 2~5 hours of long-term heat preservation are required, which requires high rigidity indicators of the equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/624C04B35/462H01L41/187
Inventor 廖运文姜宁
Owner CHINA WEST NORMAL UNIVERSITY
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