Preparation method of uniform spherical submicron-grade barium titanate powder

A barium titanate powder, sub-micron technology, applied in fixed capacitor parts, electrical components, fixed capacitor dielectric, etc., can solve the problems of increased production costs, coarse product particles, large equipment investment, etc., to achieve energy consumption Low cost, simple process flow and convenient operation

Inactive Publication Date: 2018-07-27
JIANGNAN UNIV
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  • Application Information

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Problems solved by technology

The traditional method in the solid-phase method is a high-temperature solid-phase method. For example, in the Chinese patent CN 105836794A, the slurry is sintered at 700-1000° C. for 0.5-1.5 hours to prepare barium titanate powder. The high-temperature energy consumption is high, and the product particles are coarse. Disadvantages such as uneven morphology and wide particle size distribution
Liquid phase method can be divide

Method used

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  • Preparation method of uniform spherical submicron-grade barium titanate powder
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  • Preparation method of uniform spherical submicron-grade barium titanate powder

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[0030] Example 1

[0031] Measure lye ammonium hydroxide solution (25-28%) and titanium solution titanium tetrachloride solution respectively, slowly drop 20mL titanium tetrachloride solution into 200mL deionized water under stirring state, and leave it to age for 30min , take 60mL of ammonium hydroxide solution and slowly titrate and neutralize until a large amount of precipitates are precipitated, and then wash, filter and dry to obtain α-titanic acid.

[0032] Using the α-titanic acid obtained above as a raw material, weigh barium hydroxide and α-titanic acid respectively according to the barium-titanium molar ratio of 1.05:1, mix the two together and pour them into a ball mill jar, place them on the jar mill at a speed of 600r / min After grinding for 7 hours, the material was taken out and put into an alumina crucible, then dried in an oven at 120°C for 4 hours and then cooled to room temperature to obtain a barium titanate sample powder.

[0033] see figure 1 , analyzed ...

Example Embodiment

[0034] Example 2

[0035] Measure lye ammonium hydroxide solution (25-28%) and titanium solution titanium tetrachloride solution respectively, slowly drop 20mL titanium tetrachloride solution into 200mL deionized water under stirring state, and leave it to age for 30min , take 60mL of ammonium hydroxide solution and slowly titrate and neutralize until a large amount of precipitates are precipitated, and then wash, filter and dry to obtain α-titanic acid.

[0036] Using the α-titanic acid obtained above as a raw material, weigh barium hydroxide and α-titanic acid respectively according to the barium-titanium molar ratio of 1:1.1, mix them together and pour them into a ball mill jar, place them on the jar mill at a speed of 800r / min After grinding for 5 hours, the material was taken out and put into an alumina crucible, then dried in an oven at 180°C for 2 hours and then cooled to room temperature to obtain a barium titanate sample powder.

[0037] see Figure 4 , analyzed by ...

Example Embodiment

[0038] Example 3

[0039] Measure lye ammonium hydroxide solution (25-28%) and titanium solution titanium tetrachloride solution respectively, slowly drop 20mL titanium tetrachloride solution into 200mL deionized water under stirring state, and leave it to age for 30min , take 60mL of ammonium hydroxide solution and slowly titrate and neutralize until a large amount of precipitates are precipitated, and then wash, filter and dry to obtain α-titanic acid.

[0040] Use the α-titanic acid obtained above as a raw material, weigh barium hydroxide and α-titanic acid respectively according to the barium-titanium molar ratio of 0.92:1, mix the two together and pour them into a ball mill jar, place them on the jar mill at a speed of 1000r / min After grinding for 3 hours, the material was taken out and put into an alumina crucible, then dried in an oven at 80°C for 6 hours and then cooled to room temperature to obtain a barium titanate sample powder.

[0041] see Image 6 , analyzed by...

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Abstract

The invention belongs to the field of preparation of electronic component ceramic materials and in particular relates to a preparation method of uniform spherical submicron-grade barium titanate powder, aiming at solving the problems of a current preparation technology that the energy consumption is high and waste liquid is generated, the barium titanate powder has large grains, is not uniform andis highly agglomerated and the like. A preparation technology provided by the invention is characterized in that a low-temperature solid-phase method is adopted and hydrated titanium dioxide and barium hydroxide are used as raw materials; after the raw materials are subjected to pot milling treatment, a mixed material is dried to obtain the barium titanate powder with the particle size of about 80nm. The barium titanate powder prepared by the preparation method is of a spherical shape with a uniform size and has low agglomeration and high crystallization degree; the low-temperature solid-phase method is simple to operate, the raw materials have a wide source, the energy consumption is low, no waste liquid is discharged and the like; the preparation method has good prospect and value in the aspects of industrial production and application.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic materials for electronic components, in particular to a preparation method of uniform spherical submicron barium titanate powder. Background technique [0002] Barium titanate is a ceramic powder material for electronic components with excellent electrical properties such as high dielectric constant, ferroelectricity and low dielectric loss. It is widely used in the manufacture of electronic components such as multilayer ceramic capacitors and positive temperature coefficient thermistors. . With the continuous development of electronic components in the direction of small size, large capacity, and micronization, higher requirements are put forward for the particle size, uniformity, crystallinity, purity, and dispersibility of barium titanate ceramic powder. . [0003] The preparation methods of barium titanate can be roughly divided into solid-phase method and liquid-phase method. The trad...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/626H01G4/12
CPCC04B35/4682C04B35/626C04B2235/5445C04B2235/5454H01G4/1209
Inventor 商少明丁厚远顾丹秦高敏刘浩赵贝贝
Owner JIANGNAN UNIV
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