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Nanocrystalline barium titanate ceramic and preparation method thereof

A technology of crystalline barium titanate and ceramics, which is applied in the field of nanocrystalline barium titanate ceramics and its preparation, can solve the problems of poor performance and wide particle size distribution, and achieve the effects of uniform distribution, uniform components and high purity

Inactive Publication Date: 2020-08-14
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a nanocrystalline barium titanate ceramic and its preparation method, aiming to solve the technical problems such as wide particle size distribution and poor performance in the preparation of barium titanate ceramics by the existing solid phase synthesis method

Method used

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  • Nanocrystalline barium titanate ceramic and preparation method thereof
  • Nanocrystalline barium titanate ceramic and preparation method thereof
  • Nanocrystalline barium titanate ceramic and preparation method thereof

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preparation example Construction

[0059] The embodiment of the present invention provides a preparation method of nanocrystalline barium titanate ceramics, comprising the following steps:

[0060] S1, mixing barium carbonate and titanium dioxide by ball milling to obtain slurry A;

[0061] S2. Slurry A is sanded to obtain slurry B;

[0062] S3. The slurry B is dried, sieved, and calcined to obtain nanocrystalline barium titanate ceramics.

[0063] In order to obtain nanocrystalline barium titanate ceramics with no agglomeration, uniform components and high purity, the present invention increases its sintering activity by first mixing barium carbonate and titanium dioxide with ball milling, and then increases the sintering activity on the basis of the traditional solid-phase synthesis method. The sanding step of the raw material powder is to obtain powder particles with uniform size and good mixing degree, and then calcined to obtain nanocrystalline barium titanate nano-ceramics with small particle size, unifo...

Embodiment 1

[0086] A preparation method of nanocrystalline barium titanate ceramics, comprising the steps of:

[0087] (1) KS BaCO 3 (BET is 12m 2 / g) and TA60 TiO 2 (D 50 60nm, BET 83.8m 2 / g, the manufacturer is Aladdin) puts into the nylon ball mill jar after weighing according to the ratio of Ba / Ti of 1, adds the zirconium beads that diameter is 5mm as the ball mill material, wherein, material: ball: water=1:2.5: 2.5; add 1% triethanolamine, which is the sum of the mass of barium carbonate and titanium dioxide, as a dispersant, and perform ball milling for 4 hours, and set the rotation speed at 280rpm to obtain slurry A;

[0088] (2) Slurry A is poured into a horizontal sand mill for sand milling, using zirconium beads with a diameter of 0.1mm as the ball milling material, adding 2% triethanolamine of the sum of barium carbonate and titanium dioxide mass as a dispersant for sand milling 2h, the speed of the sand mill is set to 2800rpm, the pump speed is set to 100L / h, and the slu...

Embodiment 2

[0091] This embodiment is basically the same as Embodiment 1, except that the sintering temperature is 1000°C.

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Abstract

The invention belongs to the technical field of capacitor dielectric materials, and particularly relates to nanocrystalline barium titanate ceramic and a preparation method thereof. The preparation method of the nanocrystalline barium titanate ceramic comprises the following steps of: mixing barium carbonate and titanium dioxide, and carrying out ball milling, sanding, drying, sieving and calcining to obtain the barium titanate ceramic. The preparation method of the nanocrystalline barium titanate ceramic comprises the following steps of: mixing and ball-milling barium carbonate and titanium dioxide to increase the sintering activity of barium carbonate and titanium dioxide; carrying out solid-phase synthesis by using a sanding method to obtain barium titanate nano-powder with relatively small particle size and high tetragonality; the barium titanate nano-powder is subjected to calcination treatment, and the obtained nanocrystalline barium titanate ceramic has a small grain size and ahigh dielectric constant and can meet the requirement that a capacitor contains 5-6 ceramic grains in each single dielectric medium when being used as a ceramic capacitor material.

Description

technical field [0001] The invention belongs to the technical field of capacitor dielectric materials, and in particular relates to a nanocrystalline barium titanate ceramic and a preparation method thereof. Background technique [0002] Ferroelectric materials have a wide range of applications in electronic and electro-optic devices, such as high dielectric constant multilayer ceramic capacitors (MLCCs), thermistors, dielectrics, underwater sensors, pyroelectric sensors, medical diagnostic sensors, electro-optic light valves, etc. Perovskite-structured materials are the most important and therefore the most studied ferroelectric materials. Perovskites are usually expressed as ABO 3 , in perovskite materials, barium titanate (BaTiO 3 ) is the most widely studied and widely used ferroelectric material. Barium titanate has been widely studied because of its excellent dielectric, ferroelectric, piezoelectric properties and relatively low loss and good insulation. [0003] W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468
CPCC04B35/4682C04B2235/3232C04B2235/442C04B2235/6562C04B2235/6567C04B2235/785C04B2235/96
Inventor 张蕾于洪宇王宏兆庄后荣曾俊
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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