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Method for preparing binderless BaTiO3 ceramic through microwave-assisted method

A binder-free, microwave-assisted technology, applied in the field of preparation of binder-free ceramics, can solve the problems of ceramic grain growth, easy formation of pores, complex operation, etc., achieve short reaction cycle, no temperature gradient, and easy operation simple effect

Active Publication Date: 2014-08-13
JIANGSU SHUSHI LIGHTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not only complicated to operate and poor in repeatability, but also the addition of the binder will easily form pores and unnecessary impurities during the sintering process, which will affect the grain growth of ceramics.

Method used

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  • Method for preparing binderless BaTiO3 ceramic through microwave-assisted method
  • Method for preparing binderless BaTiO3 ceramic through microwave-assisted method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) BaCl 2 ·H 2 O and TiCl 4 Dissolve completely in deionized water at 0.3mol / L and 0.6mol / L, press [NaOH] / [TiCl 4 ]=10 Add mineralizer NaOH, stir evenly, obtain co-precipitation precursor A;

[0022] 2) Pour the co-precipitation precursor A into the lining of the microwave hydrothermal reaction kettle, then put the lining into the hydrothermal kettle, set the reaction temperature to 180°C, and the reaction time to 30 minutes;

[0023] 3) After the furnace temperature was naturally cooled to room temperature, the reactant was taken out, washed several times with deionized water, and then dried at 80°C. The final nano-BaTiO 3 Powder;

[0024] 4) For the obtained BaTiO 3 The powder is first manually compacted, and the obtained BaTiO 3 The block is sieved and granulated through a 200-300-mesh sieve to obtain a powder with a particle size of 75-48 μm, and the obtained powder is molded at 100 MPa (Φ12mm×1.2mm);

[0025] 5) Sinter the formed green body in a microwave si...

Embodiment 2

[0027] 1) BaCl 2 ·H 2 O and TiCl 4 Dissolve completely in deionized water at 0.3mol / L and 0.5mol / L, press [NaOH] / [TiCl 4 ]=9 Add mineralizer NaOH, stir evenly, obtain co-precipitation precursor A;

[0028] 2) Pour the co-precipitation precursor A into the lining of the microwave hydrothermal reaction kettle, then put the lining into the hydrothermal kettle, set the reaction temperature to 200°C, and the reaction time to 30 minutes;

[0029] 3) After the furnace temperature was naturally cooled to room temperature, the reactants were taken out, washed several times with deionized water, and then dried at 70°C. The final nano-BaTiO 3 Powder;

[0030] 4) For the obtained BaTiO 3 The powder is first manually compacted, and the obtained BaTiO 3 The block is sieved and granulated through a 230-270 mesh sieve to obtain a powder with a particle size of 63-53 μm, and the obtained powder is molded at 90 MPa (Φ12mm×1.2mm);

[0031] 5) Sinter the formed green body in a microwave si...

Embodiment 3

[0033] 1) BaCl 2 ? h 2 O and TiCl 4 Dissolve completely in deionized water at 0.3mol / L and 0.6mol / L, press [NaOH] / [TiCl 4 ]=11 Add mineralizer NaOH, stir evenly, obtain co-precipitation precursor A;

[0034] 2) Pour the co-precipitation precursor A into the lining of the microwave hydrothermal reaction kettle, then put the lining into the hydrothermal kettle, set the reaction temperature to 200°C, and the reaction time to 40min;

[0035] 3) After the furnace temperature was naturally cooled to room temperature, the reactants were taken out, washed several times with deionized water, and then dried at 75°C. The final nano-BaTiO 3 Powder;

[0036] 4) For the obtained BaTiO 3 The powder is first manually compacted, and the obtained BaTiO 3 The block is sieved and granulated through a 200-230 mesh sieve to obtain a powder with a particle size of 75-63 μm, and the obtained powder is molded at 95 MPa (Φ12mm×1.2mm);

[0037] 5) Sinter the formed green body in a microwave sint...

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Abstract

The invention discloses a method for preparing a binderless BaTiO3 ceramic through a microwave-assisted method. The method comprises the following steps: dissolving BaCl2.H2O and TiCl4 into deionized water, adding mineralizer NaOH, and uniformly stirring to obtain a coprecipitation precursor A; pouring the coprecipitation precursor A into the lining of a microwave hydrothermal reaction kettle, then placing the lining into the microwave hydrothermal reaction kettle for reaction, taking a reactant out after furnace temperature is naturally cooled to room temperature, washing, and drying to obtain nanometer BaTiO3 powder; briquetting the obtained BaTiO3 powder, and then screening and granulating obtained BaTiO3 powder blocks through a mesh screen to obtain powder with the granularity of 75-48 micrometers; and forming the obtained powder, sintering a formed billet to obtain the BaTiO3 ceramic after furnace cooling. The method disclosed by the invention omits the step of bonding agent addition in a preparation process, has the advantages of low preparation cost, easiness for operation, short reaction period, low sintering temperature, good ceramic density and excellent dielectric property of a product and achieves the dielectric constant up to 3000 and the dielectric loss less than 0.1 at the room temperature of a sample.

Description

【Technical field】 [0001] The invention relates to a method for preparing binder-free ceramics, in particular to a microwave-assisted method for preparing binder-free BaTiO 3 ceramic method. 【Background technique】 [0002] Due to the characteristics of small size, large specific surface area, large surface energy, and increased interface disorder, nanomaterial particles have many better properties and new effects than traditional materials, such as quantum size effects, surface effects and Macroscopic quantum tunneling effect, etc. At present, nanomaterials are in the stage of vigorous development, and nanometer powders are usually used as raw materials. As an important electronic ceramic material, barium titanate (BaTiO 3 ) Nanopowders are widely used in the preparation of ceramic capacitors, heat-sensitive components, ferroelectric devices, etc. In the process of nanopowder molding, it is often hoped to avoid abnormal growth of grains, sample curling and other distortio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 蒲永平董子靖郭一松吴思辰
Owner JIANGSU SHUSHI LIGHTING CO LTD
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