NaNbO3-based Na2O-Nb2O5-SiO2 high-dielectric-constant energy-storage glass ceramic and preparation method

A na2o-nb2o5-sio2, high dielectric constant technology, applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve the problems of low breakdown strength and non-dense ceramic materials, and achieve high breakdown field strength , easy to crystallize, and many molding methods

Inactive Publication Date: 2019-04-16
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

NaNbO 3 Ceramics have a high dielectric constant, but because the ceramic material is not dense and contains more pores, it has a lower breakdown strength

Method used

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  • NaNbO3-based Na2O-Nb2O5-SiO2 high-dielectric-constant energy-storage glass ceramic and preparation method
  • NaNbO3-based Na2O-Nb2O5-SiO2 high-dielectric-constant energy-storage glass ceramic and preparation method
  • NaNbO3-based Na2O-Nb2O5-SiO2 high-dielectric-constant energy-storage glass ceramic and preparation method

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Embodiment 1

[0027] Embodiment 1 (comparative example):

[0028] The crystallization treatment of the glass sample in this embodiment: heat preservation at 750° C. for 4 hours.

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

[0030] 1) The sodium niobate glass-ceramic material in this embodiment is made of a molar mass ratio of 49.95:49.95:0.1, taking Na 2 CO 3 , Nb 2 o 5 and SiO 2 mix.

[0031] 2) When heating the quartz crucible with the furnace from room temperature to 1100°C, start to add the mixture, then continue heating to 1450°C, and keep the temperature at 1450°C for 50-60 minutes to melt the mixture evenly to obtain a mixed molten material; put the mixed molten material in Shaped on a copper plate, then quickly placed in a furnace and annealed at 500°C for 11 hours to obtain an annealed glass matrix;

[0032] 3) Insulate at 750°C for 4 hours and then cool to room temperature with the furnace to obtain ...

Embodiment 2

[0035] In the glass sample in this embodiment, the crystallization temperature of step 3) is 950 o C, other conditions are the same as embodiment 1.

[0036] figure 1 It is the DSC spectrum of sodium niobate glass matrix, it can be seen that 750 o C and 950 o The temperature around C is two crystallization peaks. In the DSC test, the crystallization peak represents the exothermic process of the material due to the phase change during the temperature change process. therefore figure 1 Medium 950 o The peak around C precipitates at least one phase, and is compatible with NaNbO 3 related.

[0037] figure 2In order to analyze the X-ray diffraction of the above two examples, the effects of different experimental processes on the degree of crystallization and the phase of matter are shown. It can be seen that at 950 o The product obtained under the crystallization temperature of C is higher than that of 750 o The product obtained at the crystallization temperature of C h...

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Abstract

The invention relates to a NaNbO3-based Na2O-Nb2O5-SiO2 high-dielectric-constant energy-storage glass ceramic and a preparation method of the glass ceramic. The glass ceramic material is prepared through the steps that a glass phase and a crystal phase are subjected to mixing, fusion, cooling formation, annealing and heat treatment for crystallization, wherein the glass phase accounts for, by mole, 0.1%, and the balance is the crystal phase; the crystal phase is formed by heating and fusing Na2CO3 and Nb2O5 in a mole ratio of 1:1. The NaNbO3-based energy-storage glass ceramic mateiral is low in dielectric loss; due to the addition of the NaCO3, the composition of the crystal phase of the potassium-sodium niobate system can be adjusted, moreover, a certain of promoting effect on the crystallization process is achieved, the NaNbO3 phase high in storage energy density is easily formed, and finally, the high-storage-energy-density glass ceramic material is obtained.

Description

technical field [0001] The invention relates to the field of glass ceramic materials and a preparation method thereof, in particular to a NaNbO-containing 3 Phase Na 2 O-Nb 2 o 5 -SiO 2 A systematic high dielectric constant energy storage glass-ceramic material and a preparation method thereof. Background technique [0002] In recent years, the development of pulse technology and higher application requirements have put forward more stringent requirements on the electrical breakdown resistance and energy storage performance of materials. Antiferroelectrics can obtain high dielectric constant due to their antiferroelectric-ferroelectric phase transition under high voltage. Glass materials have high breakdown strength due to their dense structure. Glass ceramics mainly heat-treat the glass matrix to generate a crystal phase inside the glass matrix, thereby obtaining a capacitor with a coordinated and matched glass phase with a high breakdown field strength and a crystal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/00C03B19/02
CPCC03B19/02C03C10/00
Inventor 蒲永平彭鑫师裕张磊
Owner SHAANXI UNIV OF SCI & TECH
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