Glass ceramic for realizing high dielectric constant and high breakdown performance by regulating glass network structure and preparation method thereof

Abstract

The invention relates to a glass ceramic capable of regulating and controlling a glass network structure to realize high dielectric constant and high breakdown performance and a preparation method thereof. The glass ceramic material is prepared by compounding a crystal phase and a glass phase, wherein the crystal phase is prepared from raw materials through mixing, melting, cooling molding, annealing and crystallization heat treatment; the crystal phase is prepared from La2O3, Na2CO3, K2CO3 and Nb2O5 in a molar ratio of x: (35-x): 5: 40 (x is equal to 0, 1, 3, 5 and 10); the glass phase is SiO2; the molar ratio of the crystal phase to the glass phase is 4: 1. The potassium-sodium niobate-based dielectric glass ceramic material prepared by the invention is high in dielectric constant and high in breakdown strength. According to the invention, La2O3 is added, so that a glass matrix obtains a compact glass network structure, and then the dielectric constant is improved through a reasonable crystallization treatment system.

Description

technical field

[0001] The invention relates to the field of glass-ceramic materials and a preparation method thereof, in particular to a glass-ceramic capable of controlling a glass network structure to achieve high dielectric constant and high breakdown performance and a preparation method thereof. Background technique

[0002] Energy storage materials are widely used in the fields of aerospace, people's livelihood and national defense technology. High dielectric constant and high breakdown are the main parameters to achieve high energy storage, but the two are negatively correlated. Glass-ceramic materials precipitate crystal phases to increase the dielectric constant through controllable crystallization of the glass matrix, but the breakdown strength of the glass matrix will decrease, which makes it difficult to achieve high energy storage density.

[0003] If the crystallization increases the dielectric constant without reducing the breakdown strength, or slightly redu...

Examples

Embodiment 1

[0028] The crystallization treatment of the glass sample in this embodiment: heat preservation at the crystallization peak for 2 hours.

[0029] The preparation method of the glass-ceramic material of the present embodiment comprises the following steps:

[0030] 1) The molar ratio of this embodiment is x : 1- x : 7: 8 ( x =0) La 2 o 3 、Na 2 CO 3 、K 2 CO 3 and Nb 2 o 5 ; The glass phase is SiO 2 ; The molar ratio of crystal phase and glass phase is 4:1.

[0031] 2) When heating the quartz crucible with the furnace from room temperature to 1100°C, start adding the mixture, then continue heating to 1500°C, and keep the temperature at 1500°C for 60 minutes to melt the mixture evenly to obtain a mixed molten material; put the mixed molten material on the copper plate Forming, then quickly put into the furnace and anneal at 500°C for 11 hours to obtain the annealed glass matrix;

[0032] 3) Keep warm at the crystallization peak temperature for 2h, and then cool down to...

Embodiment 2

[0035] In this example x=1;

Embodiment 3

[0037] In this example x =3;

technical field

[0001] The invention relates to the field of glass-ceramic materials and a preparation method thereof, in particular to a glass-ceramic capable of controlling a glass network structure to achieve high dielectric constant and high breakdown performance and a preparation method thereof. Background technique

[0002] Energy storage materials are widely used in the fields of aerospace, people's livelihood and national defense technology. High dielectric constant and high breakdown are the main parameters to achieve high energy storage, but the two are negatively correlated. Glass-ceramic materials precipitate crystal phases to increase the dielectric constant through controllable crystallization of the glass matrix, but the breakdown strength of the glass matrix will decrease, which makes it difficult to achieve high energy storage density.

[0003] If the crystallization increases the dielectric constant without reducing the breakdown strength, or slightly redu...

Examples

Embodiment 1

[0028] The crystallization treatment of the glass sample in this embodiment: heat preservation at the crystallization peak for 2 hours.

[0029] The preparation method of the glass-ceramic material of the present embodiment comprises the following steps:

[0030] 1) The molar ratio of this embodiment is x : 1- x : 7: 8 ( x =0) La 2 o 3 、Na 2 CO 3 、K 2 CO 3 and Nb 2 o 5 ; The glass phase is SiO 2 ; The molar ratio of crystal phase and glass phase is 4:1.

[0031] 2) When heating the quartz crucible with the furnace from room temperature to 1100°C, start adding the mixture, then continue heating to 1500°C, and keep the temperature at 1500°C for 60 minutes to melt the mixture evenly to obtain a mixed molten material; put the mixed molten material on the copper plate Forming, then quickly put into the furnace and anneal at 500°C for 11 hours to obtain the annealed glass matrix;

[0032] 3) Keep warm at the crystallization peak temperature for 2h, and then cool down to...

Embodiment 2

[0035] In this example x=1;

Embodiment 3

[0037] In this example x =3;

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