High-breakdown ferroelectric ceramic and preparation method thereof

A ferroelectric ceramic, high breakdown technology, applied in the field of Na1-2xMgxNbO3 ferroelectric ceramic material and its preparation, can solve the problems of low breakdown field strength, hindering in-depth research on physical properties, and non-dense ceramics, etc. The effect of penetration field strength, low material cost and simple preparation process

Active Publication Date: 2020-04-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the high temperature environment during the sintering process, the volatilization of the alkali metal Na element leads to a large number of oxygen vacancies and sodium vacancies, and NaNbO 3 Ceramics are not dense, and the breakdown field strength is low, which hinders the in-depth study of its intrinsic physical properties

Method used

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  • High-breakdown ferroelectric ceramic and preparation method thereof
  • High-breakdown ferroelectric ceramic and preparation method thereof
  • High-breakdown ferroelectric ceramic and preparation method thereof

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preparation example Construction

[0026] A high breakdown ferroelectric Na 1-2x Mg x NbO 3 A method for preparing a ceramic material, comprising the steps of:

[0027] Step 1: Preparation of pure phase NaNbO 3 spare. Weigh Na according to the molar ratio of 1:1 2 CO 3 and Nb 2 o 5 Mix to form mixture A; Na 2 CO 3 , Nb 2 o 5 The purity is above 99.0%.

[0028] Step 2: Take mixture A, zirconium balls and deionized water, mix them according to the mass ratio of 1:5:(0.8~1), 1:5:(1~1.2), and use planetary ball mill for 18~24h, Then dry at 85~100°C for 20~24h and briquette, then place it in a box furnace at 820~840°C for 3~4 hours to form NaNbO 3 Powder, spare;

[0029] Step 3: According to the chemical formula Na 1-2x Mg x NbO 3 , x =0~0.2, take NaNbO 3 Mix the powder and MgO powder evenly to form a full batch, and mix the full batch with zirconia balls and deionized water according to the mass ratio 1:(4.8~5.2):(0.8~1.2), then ball mill for 18~24h, bake Dry to obtain dried material;

[0030] ...

Embodiment 1

[0035] The preparation method of the high breakdown sodium niobate ferroelectric ceramics of the present invention, its formula is Na 1-2x Mg x NbO 3 ,in x =0.00.

[0036] Step 1: Preparation of pure phase NaNbO 3 Backup according to the molar ratio of 1:1 to take Na 2 CO 3 and Nb 2 o 5 Mix to form mixture A; Na 2 CO 3 , Nb 2 o 5 The purity is above 99.0%.

[0037] Step 2: Take the mixture A, zirconium balls and deionized water, mix them according to the mass ratio of 1:5:1, use a planetary ball mill for 24 hours, and then dry them at 80°C for 24 hours and briquette them. In a box furnace at 820°C for 4 hours to form NaNbO 3 Powder, spare;

[0038] Step 3: Take NaNbO 3 The powder is mixed with zirconia balls and deionized water according to the mass ratio of 1:5:1, then ball milled for 24 hours and dried to obtain the dried material;

[0039] Step 4: Grinding the dried material through a 120-mesh sieve to form a sieved material;

[0040] Step 5: The sieved mater...

Embodiment 2

[0043] The preparation method of the high breakdown sodium niobate ferroelectric ceramics of the present invention, its formula is Na 1-2x Mg x NbO 3 ,in x =0.01.

[0044] Step 1: Preparation of pure phase NaNbO 3 Backup according to the molar ratio of 1:1 to take Na 2 CO 3 and Nb 2 o 5 Mix to form mixture A; Na 2 CO 3 , Nb 2 o 5 The purity is above 99.0%.

[0045] Step 2: Take the mixture A, zirconium balls and deionized water, mix them according to the mass ratio of 1:5:1, use a planetary ball mill for 24 hours, and then dry them at 80°C for 24 hours and briquette them. In a box furnace at 820°C for 4 hours to form NaNbO 3 Powder, spare;

[0046] Step 3: According to the chemical formula Na 1-2x Mg x NbO 3 , x =0.01, take MgO powder and NaNbO 3 The powder is mixed evenly to form a full batch, and the full batch is mixed with zirconia balls and deionized water according to the mass ratio of 1:5:1, and then ball milled for 24 hours and dried to obtain a drie...

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Abstract

The intention discloses a high- breakdown ferroelectric ceramic. The stoichiometric formula of the ferroelectric ceramic is Na1-2xMgxNbO3. The invention also discloses a preparation method of the ceramic material, and the method comprises the following steps: adding MgO into NaNbO3, and carrying out ball milling, drying, briquetting, screening, isostatic cool pressing and sintering to obtain a Na1-2xMgxNbO3 ceramic sample. The high-breakdown Na1-2xMgxNbO3 ceramic material provided by the invention is simple in preparation process, low in material cost, green and environment-friendly, and a high-breakdown ferroelectric ceramic matrix is provided.

Description

technical field [0001] The invention relates to the field of high breakdown dielectric ceramic capacitors, in particular to a Na 1-2x Mg x NbO 3 Ferroelectric ceramic material and method for its preparation. Background technique [0002] With the miniaturization, light weight and integration of power electronic equipment, improving the energy density and power density of energy storage devices has become a challenge for researchers and a matter of social and economic benefits. The dielectric materials used in energy storage capacitors can be divided into linear dielectrics, paraelectrics, ferroelectrics, relaxor ferroelectrics, and antiferroelectrics. The unique antiparallel polarization structure of antiferroelectrics is considered to be the best candidate material for pulse energy storage materials. However, most antiferroelectric materials contain lead as well as noble metal elements such as PbZrO 3 and AgNbO 3 Base etc. Due to cost and environmental considerations...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64C04B41/88
CPCC04B35/495C04B35/622C04B35/64C04B41/5116C04B41/88C04B2235/3201C04B2235/3206C04B2235/3251
Inventor 蒲永平陈敏张倩雯李润杜欣怡
Owner SHAANXI UNIV OF SCI & TECH
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