Microwave sintered lead-free high energy density ST/NBT (nitroblue tetrazolium) ceramic material and preparation method thereof

A technology of high energy storage density and ceramic material, applied in the parts of fixed capacitors, fixed capacitor dielectrics, etc., can solve the problems of low energy storage density and unsuitable for practical applications, and achieve high energy storage density and improved polarization strength. , the effect of increasing polarization

Inactive Publication Date: 2017-09-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research on ST and NBT mostly uses NBT as the matrix, and its energy...

Method used

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  • Microwave sintered lead-free high energy density ST/NBT (nitroblue tetrazolium) ceramic material and preparation method thereof
  • Microwave sintered lead-free high energy density ST/NBT (nitroblue tetrazolium) ceramic material and preparation method thereof
  • Microwave sintered lead-free high energy density ST/NBT (nitroblue tetrazolium) ceramic material and preparation method thereof

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preparation example Construction

[0031] A kind of preparation method of the lead-free high energy storage density ST-NBT ceramic material of microwave sintering, comprises the following steps:

[0032] Step 1: Prepare pure-phase ST and pure-phase NBT for future use. Weigh SrCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 , Na 2 CO 3 and TiO 2 Mix to form Mixture B. SrCO 3 , Bi 2 o 3 , Na 2 CO 3 and TiO 2 The purity is above 99.0%.

[0033] Step 2: Mix mixtures A and B with zirconium balls and deionized water respectively, according to the mass ratio of 1:2:(0.8~1), 1:2:(1.5~2), and then use a planetary ball mill for ball milling 20-24 hours, then dried at 85°C for 14-16 hours, after briquetting, placed in a box-type furnace for 2.5-3 hours at 1150-1180°C and 4-5 hours at 840-850°C to form ST Powder and NBT powder, spare;

[0034] Step 3: According to the stoichiometric formula (1-x) ST-xNBT (x = 0.15, 0.18, 0.20, 0.25)...

Embodiment 1

[0040] The microwave sintered lead-free high energy storage density ST-NBT ceramic material of the present invention has a formula of (1-x)ST-xNBT, wherein x=0.15, and x is the mole percentage.

[0041] Step 1: Prepare pure-phase ST and pure-phase NBT for future use. Weigh SrCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 , Na 2 CO 3 and TiO 2 Mix to form Mixture B. SrCO 3 , Bi 2 o 3 , Na 2 CO 3 and TiO 2 The purity is above 99.0%.

[0042] Step 2: Mix mixtures A and B with zirconium balls and deionized water respectively, according to the mass ratio of 1:2:0.8 and 1:2:1.5, and then use a planetary ball mill for 24 hours, then dry at 85°C 14h, after briquetting, put it in a box-type furnace for 2.5 hours at 1160°C and 4 hours at 845°C to form ST powder and NBT powder respectively for later use;

[0043] Step 3: According to the stoichiometric formula 0.85ST-0.15NBT, take ST powder and NB...

Embodiment 2

[0048] The microwave sintered lead-free ST-NBT ceramic material with high energy storage density of the present invention has a formula of (1-x)ST-xNBT, wherein x=0.20, and x is the mole percentage.

[0049] Step 1: Prepare pure-phase ST and pure-phase NBT for future use. Weigh SrCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 , Na 2 CO 3 and TiO 2 Mix to form Mixture B. SrCO 3 , Bi 2 o 3 , Na 2 CO 3 and TiO 2 The purity is above 99.0%.

[0050] Step 2: Mix mixtures A and B with zirconium balls and deionized water respectively according to the mass ratio of 1:2:1 and 1:2:2, then use a planetary ball mill for 22 hours, and then dry at 85°C 15h, after briquetting, put it in a box-type furnace for 3 hours at 1170°C and 5 hours at 840°C to form ST powder and NBT powder respectively for later use;

[0051] Step 3: According to the stoichiometric formula 0.8ST-0.2NBT, take ST powder and NBT po...

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Abstract

The invention discloses a microwave sintered lead-free high energy density ST/NBT (nitroblue tetrazolium) ceramic material and a preparation method thereof. The preparation method comprises the following steps: firstly, respectively weighing the following materials at a molar ratio: Na2CO3, Bi2O3, SrCO3 and TiO2, so as to obtain a mixture, ball-milling, drying and briquetting the mixture to form a full ingredient and sequentially granulating and sieving the full ingredient, so as to form a granulated resin; next, pressing the granulated resin into a sample and sintering the prepared sample, so as to obtain a sintered sample; finally, polishing and washing the sintered sample, uniformly coating silver electrode slurry on the front surface and the back surface of the sintered sample after being polished and washed and sintering the sample coated with the silver electrode, so as to obtain ST/NBT system ceramics. The ST/NBT lead-free relaxor ferroelectrics ceramic material obtained according to the method has high dielectric constant and obvious relaxation behavior and is suitable for wider temperature range; in addition, the preparation process is simple, the cost of the material is low, and the material is environmentally friendly. Therefore, the material becomes an important candidate material excellent both in technology and economic, which can be used as a high-end industrial application material instead of a lead-based ceramic material.

Description

technical field [0001] The invention relates to the field of ceramic dielectric materials, in particular to a microwave sintered lead-free high energy storage density ST-NBT ceramic material and a preparation method thereof. Background technique [0002] Energy storage dielectric capacitors have strong anti-cycle aging performance and good working stability in high temperature and high pressure environments, which meet the requirements of new energy collection and are indispensable in new energy power generation systems. However, due to the low specific capacity, the dielectric capacitor is relatively large in practical applications. To expand its application field and realize the miniaturization and weight reduction of application equipment, it is necessary to develop high energy storage density dielectric materials. According to the E-P curve of the dielectric material, its energy storage density can be expressed by the following formula: [0003] [0004] Among them, ...

Claims

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Application Information

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IPC IPC(8): C04B35/47C04B35/622C04B35/64C04B41/88H01G4/12
CPCC04B35/47C04B35/622C04B35/64C04B41/009C04B41/5116C04B41/88C04B2235/3201C04B2235/3234C04B2235/3298C04B2235/667H01G4/1209C04B41/4535
Inventor 蒲永平崔晨薇
Owner SHAANXI UNIV OF SCI & TECH
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