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Glass ceramic with high dielectric constant and low dielectric loss and preparation method thereof

A high dielectric constant, glass ceramic technology, applied in the field of glass ceramics and its preparation, can solve the problems of limiting the effective dielectric constant of composite materials, large loss, reducing the reliability and life of capacitors, etc.

Active Publication Date: 2013-06-19
GRIMAT ENG INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glass ceramics generally have a large loss, which is mainly due to the alkali metal ions in the glass phase and the space charge in the composite material, which limits its application in the AC environment
In addition, glass ceramics, as a composite material, is composed of a high dielectric constant ceramic phase and a low dielectric constant glass phase. The content of the glass phase usually accounts for 30% to 50% of the volume fraction of the composite material, or even higher. This greatly limits the effective dielectric constant of the composite material, and it is generally difficult to obtain a high dielectric constant similar to that of sintered ferroelectric ceramics.
For capacitors with the same working voltage and capacity, the lower the dielectric constant of the capacitor medium, the thickness of the medium needs to be made thinner. Under the same working voltage, the higher the working field strength of the medium, the higher the dielectric constant in the medium. Losses increase dramatically with increasing electric field strength, reducing capacitor reliability and lifetime

Method used

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  • Glass ceramic with high dielectric constant and low dielectric loss and preparation method thereof
  • Glass ceramic with high dielectric constant and low dielectric loss and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Choose analytically pure PbO, SrCO 3 , Nb 2 o 5 、Na 2 CO 3 , SiO 2 and La 2 o 3 As raw materials, according to the molar ratio in Table 1, the ingredients are respectively prepared, using deionized water as the dispersion medium, zirconia balls as the grinding medium, mixing in a nylon tank for 4 hours by using an overturning mixer, and mixing the homogeneous slurry at 120 °C oven dry.

[0021] Then the homogeneously mixed raw materials were added into a platinum crucible, and kept at a high temperature of 1450° C. for 3 hours. Then pour the evenly melted molten glass into a metal mold preheated to 550°C in advance, and put it into an annealing furnace for stress relief annealing after forming. After 6 hours of heat preservation, turn off the annealing furnace and cool with the furnace to prepare 1 ~2 mm thick glass sheet.

[0022] The prepared glass sheet is subjected to controllable crystallization heat treatment, and the treatment process is as follows: firs...

Embodiment 2～6

[0024] Select analytically pure PbO, Sr(NO 3 ) 2 , Nb 2 o 5 , NaOH, SiO 2 and R as raw materials, according to the molar ratio in Table 1, respectively, according to the proportion of ingredients, using deionized water as the dispersion medium, zirconia balls as the grinding medium, in a nylon tank using a flipping mixer for 4 hours to mix the uniform slurry Dry in an oven at 120°C.

[0025] Then the homogeneously mixed raw materials were added into a platinum crucible, and kept at a high temperature of 1450° C. for 3 hours. Then pour the evenly melted molten glass between the two rollers of the rotating calender, press it into a glass sheet with a thickness of 1-2mm, and then immediately enter the annealing furnace for stress relief annealing. After 6 hours of heat preservation, turn off the annealing furnace. Cool in the furnace to produce glass flakes.

[0026] The prepared glass sheet is subjected to controllable crystallization heat treatment, and the treatment proc...

Embodiment 7～9

[0028] Select analytically pure PbO, Sr(NO 3 ) 2 , Nb 2 o 5 、NaNO 3 , SiO 2 and R as raw materials, according to the molar ratio in Table 1, respectively, according to the proportion of ingredients, using deionized water as the dispersion medium, zirconia balls as the grinding medium, in a nylon tank using a flipping mixer for 4 hours to mix the uniform slurry Dry in an oven at 120°C.

[0029] Then the homogeneously mixed raw materials were added into a platinum crucible, and kept at a high temperature of 1450° C. for 3 hours. Then pour the evenly melted molten glass into a metal mold preheated to 550°C in advance, and put it into an annealing furnace for stress relief annealing after forming. After 6 hours of heat preservation, turn off the annealing furnace and cool with the furnace to prepare 1 ~2 mm thick glass sheet.

[0030] The prepared glass sheet is subjected to controllable crystallization heat treatment, and the treatment process is as follows: firstly, the t...

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Abstract

The present invention provides glass ceramic with high dielectric constant and low dielectric loss and a preparation method thereof. The chemical composition of the glass ceramic is: xPbO-ySrO-zNb2O5-wNa2O-vSiO2-tR, wherein x, y, z, w, v, and t represents the molar ratio of each component, namely: 4<=x<=8, 8.4<=y<=15, 27<= z<= 36, 13.5<= w<=18, 28<= v<= 46, 0.5<= t<=5, and R is one selected from the group consisting of La2O3, Lu2O3, Pr6O11 and Sm2O3. The preparation method includes: burdening and mixing the raw materials corresponding to the components according to the molar proportion, keeping at a high temperature of 1300-1450 DEG C for 2-3 h to form a molten glass liquid, making the glass liquid into glass pieces, processing the glass pieces by a controllable crystallization heat treatment to get the glass ceramic of the present invention. The glass ceramic of the present invention has a high dielectric constant and low dielectric loss, and is suitable for using as alternating current high voltage capacitor dielectric.

Description

technical field [0001] The invention relates to a glass ceramic with high dielectric constant and low dielectric loss and a preparation method thereof. The glass ceramic is suitable for use as a medium of an AC high-voltage capacitor. Background technique [0002] AC high-voltage capacitors are one of the indispensable electronic components in high-voltage power transmission and AC high-voltage equipment. With the development of miniaturization and light weight of high-voltage equipment, more stringent requirements are put forward for high-voltage capacitors. In addition to requiring high withstand voltage strength, it is also required to have as small a dielectric loss as possible. [0003] As a new type of capacitor medium, glass ceramics has advantages that other sintered ceramics cannot match. It adopts a preparation process completely different from sintered ceramics, through high-temperature melting-rapid cooling, to prepare a completely dense glass matrix, and then ke...

Claims

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Application Information

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IPC IPC(8): C03C10/14
Inventor 杜军张庆猛罗君唐群韩东方周毅
Owner GRIMAT ENG INST CO LTD
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