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Ferroelectric glass-ceramic dielectric material and preparation method thereof

A technology of dielectric material and glass-ceramic, which is applied in the direction of fixed capacitor dielectric and components of fixed capacitor, etc., to achieve the effect of high breakdown field strength and high dielectric constant

Inactive Publication Date: 2009-09-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dielectric material prepared by this method has both high dielectric constant and high breakdown field strength, thus solving the deficiencies and defects in the current preparation of glass-ceramic dielectric materials

Method used

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  • Ferroelectric glass-ceramic dielectric material and preparation method thereof
  • Ferroelectric glass-ceramic dielectric material and preparation method thereof
  • Ferroelectric glass-ceramic dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A ferroelectric glass-ceramic dielectric and its preparation method, the composition of which is Ba / Ti=0.97.

[0027] BaCO with a purity greater than 99% 3 、TiO 2 , SiO 2 , and Al 2 o 3 As the starting material, according to BaO:TiO 2 : SiO 2 :Al 2 o 3 =a: b: c: d (wherein a=0.33, b=0.34, c=0.22, d=0.11, a+b+c+d=1) molar ratio batching, the total consumption of all raw materials is 100 grams, Ba / Ti = 0.97. Then these raw materials are added into a planetary ball mill with ball milling media (zirconia balls and absolute ethanol, wherein absolute ethanol is the ball milling media) to grind for 4-6 hours, and after drying, they are melted at 1400-1650°C for 2-6 hours;

[0028] The high-temperature melt obtained in step 1 is subjected to a double-roll cold rolling process to prepare a continuously adjustable glass sheet with a thickness between 0.5 and 1 mm;

[0029] The glass flakes prepared in step 2 are subjected to controlled crystallization. The crystallizat...

Embodiment 2

[0032] A ferroelectric glass-ceramic dielectric and a preparation method thereof, the composition of which is Ba / Ti=1.09.

[0033] BaCO with a purity greater than 99% 3 、TiO 2 , SiO 2 , and Al 2 o 3As the starting material, according to BaO:TiO 2 : SiO 2 :Al 2 o 3 =a: b: c: d (wherein a=0.35, b=0.32, c=0.22, d=0.11, a+b+c+d=1) molar ratio batching, the total consumption of all raw materials is 100 grams, Ba / Ti=1.09. Then these raw materials are added into a planetary ball mill with ball milling media (zirconia balls and absolute ethanol, wherein absolute ethanol is the ball milling media) to grind for 4-6 hours, and after drying, they are melted at 1400-1650°C for 2-6 hours;

[0034] The high-temperature melt obtained in step 1 is subjected to a double-roll cold rolling process to prepare a continuously adjustable glass sheet with a thickness between 0.5 and 1 mm;

[0035] The glass flakes prepared in step 2 are subjected to controlled crystallization. The crystalli...

Embodiment 3

[0038] A ferroelectric glass-ceramic dielectric and its preparation method, the composition of which is Ba / Ti=1.48.

[0039] BaCO with a purity greater than 99% 3 、TiO 2 , SiO 2 , and Al 2 o 3 As the starting material, according to BaO:TiO 2 : SiO 2 :Al 2 o 3 =a: b: c: d (wherein a=0.40, b=0.27, c=0.22, d=0.11, a+b+c+d=1) molar ratio batching, the total consumption of all raw materials is 100 grams, Ba / Ti=1.48. Then these raw materials are added into a ball mill (zirconia balls and absolute ethanol, wherein absolute ethanol is the ball milling medium) in a star-shaped ball mill to grind for 4-6 hours, and after drying, they are melted at 1400-1650°C for 2-6 hours;

[0040] The high-temperature melt obtained in step 1 is cold-rolled to prepare glass flakes with a thickness between 0.5 and 1 mm that can be continuously adjusted;

[0041] The glass flakes prepared in step 2 are subjected to controlled crystallization. The crystallization process is divided into two ste...

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Abstract

The invention relates to a ferroelectric glass-ceramic dielectric material and a preparation method thereof, belonging to the field of functional ceramics material. The preparation method comprises: BaCO3, TiO2, SiO2 and Al2O3 are taken as starting materials which are mixed together according to the proportion of aBaCO3-b TiO2-c SiO2-d Al2O3, and then dried after being grinded and mixed by ball milling; then the mixture is kept at the high temperature of 1400-1650 DEG C for 2-6h to be melt; after quick cooling, high density homogeneous glass can be obtained, controlled crystallization is carried out at certain temperature, and the ferroelectric glass-ceramic dielectric can be obtained. The dielectric constant of the ferroelectric glass-ceramic dielectric prepared by the method is adjustable within the range of 100-400, and the DC breakdown field strength reaches up to 54kV / mm. The invention can be used for the fabrication of a pulse capacitor and a DC ultra high voltage capacitor.

Description

technical field [0001] The invention relates to a ferroelectric glass-ceramic dielectric material and a preparation method thereof, belonging to the field of functional ceramic materials. Background technique [0002] Glass-ceramics, also known as glass-ceramics, is a kind of polycrystalline solid material containing a large number of microcrystalline phases and glass phases, which is obtained by controlling the crystallization of a specific composition of basic glass during the heating process. Although the structure, properties and preparation methods of glass-ceramics are different from those of glass and ceramics, glass-ceramics not only has the basic properties of glass, but also has the polycrystalline characteristics of ceramics. It combines the advantages of glass and ceramics and has become a unique new material. Functional glass-ceramic mainly obtains special ferroelectric and piezoelectric functions through the design of composition and structure, and its excelle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02C03B32/02C03C17/06H01G4/08
Inventor 陈继春张勇邓长生戴遐明
Owner TSINGHUA UNIV
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