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Barium strontium titanate-based dielectric ceramic material as well as preparation method and application thereof

A technology of barium strontium titanate and dielectric ceramics, which is applied in the field of electronic ceramic materials, can solve the problems of increased dielectric constant, decreased energy storage density, and decreased dielectric constant, achieving high dielectric constant, improved electrical resistance, good frequency stability

Active Publication Date: 2020-10-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If so, the increase of the Ba / Sr ratio is conducive to the increase of the dielectric constant, that is, the increase of the electric polarization strength, but it will lead to the decrease of the electric strength and the decrease of the energy storage density.
However, the increase of oxides such as Mg, Al, Zr, and Si is beneficial to the increase of dielectric strength, but the decrease of its dielectric constant will also decrease the energy storage density.

Method used

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  • Barium strontium titanate-based dielectric ceramic material as well as preparation method and application thereof
  • Barium strontium titanate-based dielectric ceramic material as well as preparation method and application thereof
  • Barium strontium titanate-based dielectric ceramic material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] According to 0.27BaTiO 3 +0.22SrTiO 3 +0.13TiO 2 +0.036Bi 2 o 3 +0.29MgO+0.012Al 2 o 3 +0.04CaO+0.002SiO 2 Formulation composition weighing BaTiO 3 , SrTiO 3 、TiO 2 、 Bi 2 o 3 , MgO, Al 2 o 3 , CaCO 3 and SiO 2 Raw materials, using water as the medium and agate balls as the grinding medium, after wet ball milling for 24 hours, discharging and drying, pre-calcining the obtained powder at 1050°C for 6 hours; performing wet ball milling again, and drying to obtain the particle size It is a mixed powder of 0.5-1.0 μm; to the obtained mixed powder, add 0.8wt% polyvinyl alcohol (PVA) whose weight is the total weight of the mixed powder to carry out spray granulation, and then press under the isostatic pressure of 200MPa to form different Size green body; sinter the obtained green body at 1270°C for 10h, and then naturally cool to room temperature to obtain a ceramic block; cut and finely grind the obtained ceramic block to obtain length 300mm×width 40mm×thickne...

Embodiment 2

[0054] According to 0.25BaTiO 3 +0.20SrTiO 3 +0.13TiO 2 +0.036Bi 2 o 3 +0.33MgO+0.012Al 2 o 3 +0.04CaO+0.002SiO 2 Formulation composition weighing BaTiO 3 , SrTiO 3 、TiO 2 、 Bi 2 o 3 , MgO, Al 2 o 3 , CaCO 3 and SiO 2 Raw materials, ceramics were prepared according to the same process as in Example 1, and the sintering temperature was 1270° C. for 4 hours. Figure 10 Be the dielectric thermogram of ceramic in the present embodiment, Figure 11 It is the collection of graphs of the dielectric constant temperature change rate of the ceramics prepared in the embodiment of the present invention, by Figure 10 , Figure 11 It can be seen that the room temperature dielectric constant of the ceramics prepared in the embodiment of the present invention is about 1020, the dielectric loss is ~0.0024@1kHz, and the dielectric constant gradually decreases with the increase of temperature from -50°C, and the change rate is +4.6 ~ -4.7 (@-0℃~40℃). The electric strength at ...

Embodiment 3

[0056] According to 0.28BaTiO 3 +0.23SrTiO 3 +0.15TiO 2 +0.04Bi 2 o 3 +0.245MgO+0.013Al 2 o 3 +0.04CaO+0.002SiO 2 Ceramics were prepared according to the same process as in Example 1, and the sintering temperature was 1270° C. for 4 hours. Figure 12 Be the dielectric thermogram of ceramic in the present embodiment, Figure 13 It is the collection of graphs of the dielectric constant temperature change rate of the ceramics prepared in the embodiment of the present invention, by Figure 12 , Figure 13 It can be seen that the room temperature dielectric constant of the ceramics prepared in the embodiment of the present invention is about 1228, the dielectric loss is ~0.0004@1kHz, and the dielectric constant gradually decreases with the increase of temperature from -50°C, and the change rate is +5.0~- 4.9(@-0℃~40℃). The electric strength at room temperature is ~38.4kV / mm, 48.7kV / mm (@1mm, 0.38mm).

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Abstract

The invention relates to a barium strontium titanate-based dielectric ceramic material as well as a preparation method and application thereof. The composition formula of the barium strontium titanate-based dielectric ceramic material comprises the following components: aBaTiO3+bSrTiO3+cTiO2+dBiO5+e MgO+fAl2O3+gCaO+hSiO2, wherein a, b, c, d, e, f, g and h are molar percentages of the components; 20 < = a < = 50 mol%; 15 < = b < = 30 mol%, 10 < = c < = 20 mol%, 0 < = d < = 10 mol%, 0 < = e < = 35 mol%, 0 < = f < = 6 mol%, 0 < = g < = 6 mol%, 0 < = h < = 1 mol%, and a + b + c + d + e + f + g + h= 100 mol%.

Description

technical field [0001] The invention relates to a strontium barium titanate-based dielectric ceramic material with high dielectric constant, high electric strength and stable high dielectric performance, a preparation method and application thereof, and belongs to the technical field of electronic ceramic materials. Background technique [0002] Capacitors are one of the main components widely used in electronic equipment, and have the capabilities of DC blocking, coupling, bypassing, filtering, tuning loops, energy conversion, and control circuits. Among the various types of capacitors, ceramic dielectric capacitors store energy due to the polarization response under the external electric field, and can realize the direct storage of electric energy in the form of electrostatic charge in the bipolar plates. This process does not involve the diffusion of substances, so it has extremely high The charging and discharging speed is high, so it has a high output power density. At...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/468C04B35/622C04B35/626C04B41/88
CPCC04B35/453C04B35/468C04B35/622C04B35/62605C04B41/88C04B41/5116C04B2235/3236C04B2235/3206C04B2235/3232C04B2235/3217C04B2235/3208C04B2235/3418C04B2235/3298C04B2235/6567C04B41/4539C04B41/0072C04B35/4682C04B35/63416C04B2235/442C04B2235/5436C04B2235/5445C04B2235/604C04B2235/661C04B35/465C04B35/47C04B2235/3215C04B2235/3213C04B2235/444C04B2235/443C04B2235/44C04B35/6342C04B35/6365C04B35/6262C04B2235/95C04B35/64C04B35/62695C04B35/62675
Inventor 陈莹董显林李鑫江峰王勇坚
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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