Preparation method of (Ba, Sr)TiO3 nanometer/micrometer/nanometer laminated structure ceramics

A nano-layered and nano-technology, which is applied in the field of preparation of special structural ceramics, can solve the problems of low density of thick films and limit the performance of thick films, and achieve the effect of improving surface density

Inactive Publication Date: 2010-12-22
SHANGHAI UNIV
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Problems solved by technology

In this way, the density of the thick film is not h

Method used

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  • Preparation method of (Ba, Sr)TiO3 nanometer/micrometer/nanometer laminated structure ceramics
  • Preparation method of (Ba, Sr)TiO3 nanometer/micrometer/nanometer laminated structure ceramics
  • Preparation method of (Ba, Sr)TiO3 nanometer/micrometer/nanometer laminated structure ceramics

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Embodiment

[0022] The preparation process and steps in this embodiment are as follows:

[0023] 1. (Ba, Sr)TiO 3 Preparation of micron powder

[0024] Raw material is BaCO 3 (Analytical pure), TiO 2 (Analytical pure), SrCO 3 (Purity 97%); First, weigh the above-mentioned raw materials into a ball milling tank at a stoichiometric ratio of 1:1, add deionized water and ball milling media in an appropriate proportion for ball milling for 24 hours; wherein the amount of deionized water added is about It is 2 / 3 of the volume of the ball milling tank, and the quality of the ball milling medium should be about 0.8 to 1.5 times of the total amount of raw materials; the purpose of ball milling is to mix different raw materials fully and uniformly, and grind the coarser particles fine; The ball-milled slurry is dried at 110°C and then ground and sieved to obtain a fine powder, which is placed in a sintering furnace for calcination at 1100°C to obtain (Ba, Sr)TiO 3 Micron powder; the function of pre-burn...

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Abstract

The invention relates to a preparation method of (Ba, Sr)TiO3 nanometer/micrometer/nanometer laminated structure ceramics, belonging to the technical field of special structure ceramic preparation processes. The preparation method comprises the following steps of: to synthesizing BaSrTiO3 micrometer powder mainly with BaCO3, TiO2 and SrCO3 as raw materials; preparing BaTiO3 sol with Ba(OH)2.8H2O, glacial acetic acid, Ti(OC4H9)4, absolute ethyl alcohol and benzene as raw materials, and calcining the BaTiO3 sol at 700 DEG C to form BaTiO3 nanometer powder; and then carrying out dry pressing and moulding to form the nanometer/micrometer/nanometer laminated structure layer by layer according to the sequence of the BaTiO3 nanometer powder material, the (Ba, Sr)TiO3 micrometer powder material and the BaTiO3 nanometer powder material; carrying out isostatic pressing on the nanometer/micrometer/nanometer laminated structure to form a laminated structure ceramic bisque; and finally sintering the bisque at 1280-1320 DEG C to prepare the (Ba, Sr) TiO3 nanometer/micrometer/nanometer laminated structure ceramics.

Description

Technical field [0001] The invention relates to a (Ba, Sr)TiO 3 (BST) A method for preparing nano / micro / nano layered structure ceramics belongs to the technical field of special structure ceramics preparation technology. Background technique [0002] With the development of modern wireless communications, more and more researches are now focused on electronic tuning microwave devices, and ferroelectric materials have good applications in microwave tuning devices. The dielectric constant of ferroelectric materials changes with the applied electric field, which is beneficial to the preparation of tuning electronic devices. [0003] As barium strontium titanate (Ba, Sr)TiO 3 With high tuning and low dielectric loss at room temperature, it is a ferroelectric material that has been studied more. And in (Ba, Sr)TiO 3 Among all forms of materials, (Ba, Sr)TiO 3 Thick film has a lower manufacturing cost compared with thin film, and can obtain greater tuning under a smaller DC bias than ce...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 金灯仁王婷婷杨武李娟
Owner SHANGHAI UNIV
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