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Lead-free high-voltage medium-temperature sintered strontium bismuth titanium-based dielectric material and preparation method thereof

A dielectric material, strontium-bismuth-titanium technology, is applied in the field of lead-free high-pressure medium-temperature sintered strontium-bismuth-titanium-based dielectric materials and the preparation field, which can solve problems such as limited application range, achieve increased synthesis rate, increased contact area, and energy consumption reduction effect

Pending Publication Date: 2020-11-13
CHENGDU HONGMING & UESTC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The strontium-bismuth-titanium ceramics in the prior art can only be used at a frequency of 1MHz due to their performance limitations. When the dielectric constant is higher than 250, the temperature coefficient can only reach the KL group of -2200±500ppm / ℃ in the national standard. For making high-frequency and high-voltage ceramic capacitors, the application range is limited; in addition, if you want to achieve medium-temperature sintering and reduce energy consumption, you need to add cooling glass or add low-melting point oxides such as lithium and boron

Method used

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  • Lead-free high-voltage medium-temperature sintered strontium bismuth titanium-based dielectric material and preparation method thereof
  • Lead-free high-voltage medium-temperature sintered strontium bismuth titanium-based dielectric material and preparation method thereof
  • Lead-free high-voltage medium-temperature sintered strontium bismuth titanium-based dielectric material and preparation method thereof

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preparation example Construction

[0021] The present invention also provides a method for preparing the lead-free high-pressure medium-temperature sintered strontium-bismuth-titanium-based dielectric material, including:

[0022] (1) SrCO 3 、TiO 2 、Bi 2 o 3 、BaCO 3 and / or CaCO 3 and metal oxides in parts by weight to obtain a mixture, with zirconia balls as the grinding medium and water as the solvent; according to the material: ball: water weight ratio of 1:5-6:1.5-2.5 for grinding and mixing 5 -8h to obtain the first mixed slurry; dry the first mixed slurry at 140°C and pass through a 40-mesh sieve, pre-calcine at 1060-1140°C for 3-5h, obtain a synthetic agglomerate and then pulverize to obtain a powder; In this example, SrCO 3 The purity is greater than 97%, TiO 2 The purity is greater than 98%, Bi 2 o 3 for electronic grade.

[0023] (2) The powder is batched again, with zirconia balls as the grinding medium and water as the solvent; according to the material: ball: water weight ratio is 1:5-6:1....

Embodiment 1

[0026] This embodiment provides a method for preparing a lead-free high-pressure medium-temperature sintered strontium-bismuth-titanium-based dielectric material, including: (1) SrCO 3 、TiO 2 、Bi 2 o 3Mix with MgO according to the mass ratio of 47.3:32.35:6.31:14.1 to obtain a mixture, use zirconia balls as the grinding medium, and use water as the solvent; grind and mix according to the material: ball: water weight ratio of 1:5:1.5 8h to obtain the first mixed slurry; dry the first mixed slurry at 140°C and pass through a 40-mesh sieve, pre-fire at 1060°C for 5h, obtain a synthetic burnt block and then pulverize it to obtain a powder; (2) the powder The material is batched again, with zirconia balls as the grinding medium, and water as the solvent; according to the material: ball: water weight ratio of 1:5:1.5, grind and mix for 45 hours, and pass through a 320 mesh sieve to obtain the second mixed slurry; Dry the second mixed slurry at 140°C and pass through an 80-mesh si...

Embodiment 2

[0028] This embodiment provides a method for preparing a lead-free high-pressure medium-temperature sintered strontium-bismuth-titanium-based dielectric material, including: (1) SrCO 3 、TiO 2 、 Bi 2 o 3 and ZrO 2 According to the mass ratio of 42.42:33.6:13.41:10.57, the mixture is obtained by batching, using zirconia balls as the grinding medium, and water as the solvent; according to the material: ball: water weight ratio of 1:5:1.5, grind and mix for 8 hours, Obtain the first mixed slurry; dry the first mixed slurry at 140°C and pass through a 40-mesh sieve, pre-fire at 1060°C for 5 hours, obtain a synthetic agglomerate and then pulverize it to obtain a powder; (2) The powder is again Carry out batching, use zirconia balls as the grinding medium, use water as the solvent; grind and mix for 45 hours according to the weight ratio of material:ball:water of 1:5:1.5, and pass through a 320 mesh sieve to obtain the second mixed slurry; The second mixed slurry is dried at 140°...

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Abstract

The invention belongs to the technical field of high-voltage ceramic dielectric capacitor materials, and provides a lead-free high-voltage medium-temperature sintered strontium bismuth titanium-baseddielectric material and a preparation method thereof. The strontium bismuth titanium-based dielectric material is prepared from the following raw materials: SrCO3, TiO2, Bi2O3 and a metal oxide. The strontium bismuth titanium-based dielectric material can meet the requirements of a high-voltage ceramic capacitor and a negative temperature compensation type capacitor on the dielectric property of the material at the same time, and is wider in application range; and medium-temperature sintering can be realized only by adding a common sintering aid without synthesizing cooling glass in advance oradding low-melting-point oxides such as lithium and boron. The preparation method comprises the following steps: firstly, pre-synthesizing a sintered block by adopting a solid-phase synthesis method,then preparing materials for the second time, ball-milling, drying, preparing a sample, and sintering at a medium temperature in an air atmosphere. The preparation method is simple in production andpreparation process and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of high-voltage ceramic capacitor materials, and in particular relates to a lead-free high-voltage medium-temperature sintered strontium-bismuth-titanium-based dielectric material and a preparation method thereof. Background technique [0002] High-voltage ceramic capacitors are widely used in military fields such as aerospace, launch vehicle and nuclear industry, and also have great application space in civilian applications. High-voltage ceramic capacitors have the ability to block DC and separate various frequencies. They are widely used components in electronic equipment. They can match the production needs of various types of complete machine cores and improve the comprehensive supporting capabilities of electronic devices. [0003] At present, the system material of high-voltage ceramic capacitors is mainly strontium titanate porcelain, and most of the researches are on lead-containing materials. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/622
CPCC04B35/01C04B35/622C04B2235/3232C04B2235/3298C04B2235/3206C04B2235/3244C04B2235/3227
Inventor 蒋琦汪小玲张晓丹冉隆荣江俊俊
Owner CHENGDU HONGMING & UESTC NEW MATERIALS
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