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Preparation method of Ba6Zr2Nb8O30 ceramic with porous structure

A technology of ba6zr2nb8o30 and porous structure is applied in the field of preparation of Ba6Zr2Nb8O30 ceramics with porous structure, and achieves the effects of low cost of raw materials, simple equipment and preparation process

Inactive Publication Date: 2013-12-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the currently reported Ba 6 Zr 2 Nb 8 o 30 The withstand voltage characteristic of ceramic is only 1.5kV / mm

Method used

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  • Preparation method of Ba6Zr2Nb8O30 ceramic with porous structure
  • Preparation method of Ba6Zr2Nb8O30 ceramic with porous structure
  • Preparation method of Ba6Zr2Nb8O30 ceramic with porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The first step: first according to the chemical formula Ba6Zr 2 Nb 8 o 30 , weighing the dried BaCO 3 , ZrO 2 , Nb 2 o 5 powder, add alcohol to the mixture of the three powders, and then perform ball milling (320 rpm, 24 hours) to mix the three powders evenly. of which BaCO 3 , ZrO 2 , Nb 2 o 5 The purity of the powder is greater than or equal to 99.0%.

[0033] The second step: After drying the powder mixture obtained in the first step, grind it with a mortar to make it uniform, and pre-fire it in the air at 750°C for 3 hours, and then grind it with a mortar to make it uniform.

[0034]The third step: the powder is subjected to secondary ball milling treatment (320 rpm, 24 hours), so that the three powders are further mixed and dried.

[0035] Step 4: Use a pressure of 20MPa to press the uniformly mixed powder mixture into thin sheets. The flakes have a diameter of about 10.0 mm and a thickness of about 3 mm. Ferroelectric materials generally have a circul...

Embodiment 2

[0039] Repeat Example 1 with the following differences: make the flakes sintered at 1250°C for about 5 hours to obtain the corresponding Ba 6 Zr 2 Nb 8 o 30 ceramics.

Embodiment 3

[0041] Repeat Example 1 with the following differences: make the flakes sintered at 1250°C for about 10 hours to obtain the corresponding Ba 6 Zr 2 Nb 8 o 30 ceramics.

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Abstract

The invention discloses a preparation method of Ba6Zr2Nb8O30 ceramic with a porous structure. The preparation method comprises the following steps of: utilizing BaCO3, ZrO2 and Nb2O5 powder; ball milling, pre-burning and ball milling mixture of the powder to obtain treated powder; and tabletting and then sintering the treated powder, wherein the sintering temperature is 1,250 DEG C and the sintering time is 5 hours. The Ba6Zr2Nb8O30 ceramic with the porous structure is obtained by using the preparation method provided by the invention; required equipment and preparation process are simple; the raw material cost is low; the Ba6Zr2Nb8O30 ceramic of the porous structure can be obtained without any pore forming agent under the conditions of certain sintering temperature and sintering time; the corresponding porous ceramic voltage endurance characteristic can reach 15 kV / mm; and the ceramic basically has no strain at external voltage.

Description

technical field [0001] The invention relates to a method for preparing ceramics. Background technique [0002] Tungsten bronze structure relaxor ferroelectric materials have some unique dielectric, ferroelectric, pyroelectric, and photoelectric properties, so they have important applications in the fields of optoelectronics, infrared detection, drives, transducers, resonators, etc., which makes Tungsten bronze structure ferroelectric materials have become one of the mainstreams in the research of relaxor ferroelectric materials. At present, researchers are working on improving and enhancing the traditional Sr x Ba 1-x Nb 2 o 6 properties, such as improving the ferroelectric, dielectric, photoelectric properties and property stability by doping various elements, and studying the property-structure relationship of ceramics. On the other hand, we are also looking for new ceramics with excellent properties. Tungsten bronze structure relaxor ferroelectric material. Has been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/495C04B35/622
Inventor 张善涛张冲顾正彬
Owner NANJING UNIV