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A k for energy storage 2 o na 2 o‑nb 2 o 5 ‑sio 2 -b 2 o 3 System glass ceramic material and preparation method thereof

A glass-ceramic, k2o-na2o-nb2o5-sio2-b2o3 technology, applied in the field of glass-ceramic materials and their preparation, can solve the problems of high breakdown field strength, inability to prepare, etc., and achieves high breakdown field strength and easier uniformity Hybrid, cost-reducing effects

Active Publication Date: 2018-01-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For perovskite type (K,Na)NbO 3 In terms of materials, there are relatively hot research and development prospects in piezoelectricity and PTC. At present, it is still impossible to prepare a potassium sodium niobate glass ceramic with high breakdown field strength and high dielectric constant.

Method used

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  • A k for energy storage <sub>2</sub> o na <sub>2</sub> o‑nb <sub>2</sub> o <sub>5</sub> ‑sio <sub>2</sub> -b <sub>2</sub> o <sub>3</sub> System glass ceramic material and preparation method thereof
  • A k for energy storage <sub>2</sub> o na <sub>2</sub> o‑nb <sub>2</sub> o <sub>5</sub> ‑sio <sub>2</sub> -b <sub>2</sub> o <sub>3</sub> System glass ceramic material and preparation method thereof
  • A k for energy storage <sub>2</sub> o na <sub>2</sub> o‑nb <sub>2</sub> o <sub>5</sub> ‑sio <sub>2</sub> -b <sub>2</sub> o <sub>3</sub> System glass ceramic material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0029] The crystallization treatment of the glass sample in this embodiment: heat preservation at 708° C. for 1 hour and heat preservation at 905° C. for 4 hours.

[0030] The preparation method of the glass-ceramic material of the present embodiment comprises the following steps:

[0031]1) The sodium potassium niobate glass-ceramic material in this embodiment is made of a material ratio of 15:15:30:4:2:3, taking K 2 CO 3 , Na 2 CO 3 , Nb 2 o 5 , SiO 2 , H 3 BO 3 and BaF 2 mix.

[0032] 2) When heating the quartz crucible with the furnace from room temperature to 1100°C, start adding the mixture, then continue heating to 1350°C, and keep the temperature at 1350°C for 30 minutes to melt the mixture evenly to obtain a mixed molten material; put the mixed molten material on the copper plate After molding, put it into the furnace quickly and anneal at 600°C for 7 hours to obtain the annealed glass;

[0033] 3) After holding at 708°C for 1h, continue to hold at 905°C fo...

Embodiment 2

[0036] The crystallization treatment of the glass sample in this embodiment: heat preservation at 708° C. for 4 hours and heat preservation at 905° C. for 1 hour, and other conditions are the same as in Embodiment 1.

Embodiment 3

[0038] The crystallization treatment of the glass sample in this embodiment: heat preservation at 708° C. for 2 hours and heat preservation at 905° C. for 3 hours, and other conditions are the same as in Embodiment 1.

[0039] figure 2 For the X-ray diffraction analysis of the above three examples, the effects of different crystallization treatments on the degree of crystallization and crystallization purity are shown. It can be seen that under the crystallization treatment in Example 1, due to the long holding time at the low-temperature crystallization temperature and the short holding time at the high-temperature crystallization temperature, it is not conducive to the growth of crystal grains, and the glass phase still exists in large quantities, so that impurities There are many peaks. In Example 2, the prolonged holding time at high temperature is beneficial to the formation of the main crystal phase, but at the same time it is also beneficial to the growth of other sec...

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Abstract

The invention relates to a K2O-Na2O-Nb2O5-SiO2-B2O3 system glass ceramic material used for energy storage, and a preparation method thereof. The method comprises the following steps: mixing K2CO3, Na2CO3, Nb2O5, SiO2, H3BO3 and BaF2 according to a molar ratio of 15:15:30:4.2:(2-5), fusing, molding, annealing, and crystallizing to prepare the material. Alkali metal oxides in raw materials exist in the glass system as a network modifier to destroy the network structure of glass, so the formula of the glass is simplified, the cost is reduced, and the quantity of kinds of precipitated impure phases is fundamentally reduced; a fusion technology is adopted, so the raw materials highly and uniformly react, and the experiment operation is simple; annealing can effectively eliminate internal stress; and segment heat insulation is adopted in the crystallization treatment process, so a crystal phase completely grows, crystal precipitation is thorough, and obtaining of glass ceramic with fine internal crystal grins, high homogenization degree and high energy storage density is facilitated.

Description

technical field [0001] The invention relates to a glass ceramic material and a preparation method thereof, in particular to a K 2 O-Na 2 O-Nb 2 o 5 -SiO 2 -B 2 o 3 Systematic glass-ceramic materials and methods for their preparation. Background technique [0002] With the development of pulse power technology, people have put forward higher requirements for the energy storage density of energy storage components. Compared with other devices, capacitors have the advantages of large discharge power, high utilization efficiency, and large space for energy storage density increase. It has gradually become an energy storage element in pulse power equipment and is widely used. [0003] According to the calculation formula of energy storage density of linear dielectric It can be obtained that the energy storage density of the energy storage element is related to its own relative permittivity and breakdown field strength. Ferroelectrics have a high dielectric constant, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00C03C4/00
Inventor 蒲永平郑晗煜柳晓燕
Owner SHAANXI UNIV OF SCI & TECH
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