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Method for reducing dielectric loss of niobate-based glass ceramic high voltage capacitor device

A technology of high-voltage capacitors and glass ceramics, which is applied in the field of reducing the dielectric loss of niobate-based glass ceramic high-voltage capacitor devices, can solve the problems of unsatisfactory performance requirements, large dielectric loss, and temperature rise, so as to ensure uniform nucleation and Effects of growth, reduction of dielectric loss, and improvement of stability

Active Publication Date: 2016-07-27
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dielectric loss of glass ceramics is generally greater than that of conventional sintered ceramics, which cannot meet the performance requirements of high-precision equipment such as transformers.
[0003] The dielectric loss of the existing niobate-based glass-ceramic high-voltage capacitor device is 0.013, and the loss is too high to continuously generate heat in a long-term working environment. If the heat generated is greater than the heat dissipated by the epoxy packaging material, the high-voltage capacitor will temperature rises continuously until thermal damage
Therefore, the loss of niobate-based glass-ceramic high-voltage capacitors seriously restricts its application in high-precision equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Choose PbO, SrCO with a purity greater than 99.5% 3 , Nb 2 o 5 、Na 2 CO 3 , SiO 2 and Al 2 o 3 As raw material, according to 5PbO-9SrCO 3 -30Nb 2 o 5 -15Na 2 CO 3 -24SiO2 2 -0.024Al 2 o 3 (molar ratio) was batched, and then mixed for 4 hours using a tumble mixer. Then the homogeneously mixed raw materials were put into a platinum crucible and melted at a high temperature of 1370°C for 2 hours. Then quickly pour the evenly melted molten glass into a metal mold preheated to 550°C in advance. After forming, put it into an annealing furnace for stress relief annealing. After 6 hours of heat preservation, turn off the annealing furnace and cool with the furnace to prepare a uniform glass. Transparent glass sheet.

[0025]The prepared glass sheet is subjected to controllable crystallization heat treatment, and the treatment process is as follows: firstly, the temperature is kept at 600°C for 3 hours to promote the uniform nucleation of the main ceramic phase, ...

Embodiment 2

[0028] Choose PbO, SrCO with a purity greater than 99.5% 3 , Nb 2 o 5 、Na 2 CO 3 , SiO 2 and Al 2 o 3 As raw material, according to 6PbO-10SrCO 3 -32Nb 2 o 5 -16Na 2 CO 3 -30SiO 2 -1.2Al 2 o 3 (molar ratio) was batched, and then mixed for 4 hours using a tumble mixer. Then the homogeneously mixed raw materials were put into a platinum crucible and melted at a high temperature of 1370°C for 2 hours. Then quickly pour the evenly melted molten glass into a metal mold preheated to 550°C in advance. After forming, put it into an annealing furnace for stress relief annealing. After 6 hours of heat preservation, turn off the annealing furnace and cool with the furnace to prepare a uniform glass. Transparent glass sheet.

[0029] The prepared glass sheet is subjected to controllable crystallization heat treatment, and the treatment process is as follows: firstly, the temperature is kept at 600°C for 3 hours to promote the uniform nucleation of the main ceramic phase, a...

Embodiment 3

[0032] Choose PbO, SrCO with a purity greater than 99.5% 3 , Nb 2 o 5 、Na 2 CO 3 , SiO 2 and Al 2 o 3 As raw material, according to 5PbO-10SrCO 3 -33Nb 2 o 5 -18Na 2 CO 3 -35SiO 2 -0.21Al 2 o 3 (molar ratio) was batched, and then mixed for 4 hours using a tumble mixer. Then the homogeneously mixed raw materials were put into a platinum crucible and melted at a high temperature of 1370°C for 2 hours. Then quickly pour the evenly melted molten glass into a metal mold preheated to 550°C in advance. After forming, put it into an annealing furnace for stress relief annealing. After 6 hours of heat preservation, turn off the annealing furnace and cool with the furnace to prepare a uniform glass. Transparent glass sheet.

[0033] The prepared glass sheet is subjected to controllable crystallization heat treatment, and the treatment process is as follows: firstly, the temperature is kept at 600°C for 3 hours to promote the uniform nucleation of the main ceramic phase, ...

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Abstract

The invention discloses a method for reducing dielectric loss of a niobate-based glass ceramic high voltage capacitor device. Aluminium oxide is added into raw materials of glass ceramics, and mol ratio between added aluminium oxide and silica is 0.1-5%. The niobate-based glass ceramic comprises the following components: xPbO-ySrO-zNb2O5-wNa2O-vSiO2, wherein x, y, z, w and v express mole numbers of components, and x is more than or equal to 5 and less than or equal to 7, y is more than or equal to 9 and less than or equal to 11, z is more than or equal to 30 and less than or equal to 33, w is more than or equal to 15 and less than or equal to 18, and v is more than or equal to 25 and less than or equal to 35. Aluminium oxide is added for improving performance of glass phase, so that in the condition that original preparation processes are not changed, insulation resistance of glass phase is increased, conductance loss of glass phase is reduced, and dielectric loss of the niobate-based glass ceramic high voltage capacitor is reduced macroscopically.

Description

technical field [0001] The invention relates to a method for reducing the dielectric loss of a niobate-based glass ceramic high-voltage capacitor device. Background technique [0002] High-voltage capacitors used in power systems are generally used in equipment such as metering, energy storage, and voltage division, such as transformers, circuit breakers, lightning arresters, and high-voltage metering boxes. For equipment with high measurement accuracy requirements such as voltage transformers, the core component is the voltage sensor, which puts forward higher requirements for the capacitor voltage dividing element in the sensor: not only high AC withstand voltage, low capacitance change rate with temperature, and partial discharge The amount is low, and the dielectric loss of the capacitor is also required to be low. At present, niobate-based glass-ceramics prepared by controlled crystallization technology have high dielectric constant, and at the same time, due to the st...

Claims

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Application Information

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IPC IPC(8): C03C10/02
Inventor 周昊唐群张庆猛
Owner GRIMAT ENG INST CO LTD
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