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A KNN-based energy storage glass-ceramic material with ultra-low dielectric loss and its preparation method

A technology of ultra-low dielectric and glass-ceramics, which is applied in the field of glass-ceramic materials, can solve problems such as unpreparable and high breakdown field strength, and achieve fine internal grains, eliminate internal stress, and complete crystal growth Effect

Active Publication Date: 2019-10-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 KNN-based energy storage glass-ceramic material with ultra-low dielectric loss and its preparation method
  • A KNN-based energy storage glass-ceramic material with ultra-low dielectric loss and its preparation method
  • A KNN-based energy storage glass-ceramic material with ultra-low dielectric loss and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the glass-ceramic material of the present embodiment comprises the following steps:

[0036] 1) The KNN-based glass-ceramic material in this embodiment is 0.25:0.25:0.6:0.1:0.6:0.2 by the amount of substance, and K 2 CO 3 , Na 2 CO 3 , Nb 2 o 5 , BaCO 3 , SiO 2 , H 3 BO 3 and 0.2 mol% CeO 2 mix. At this time, in the crystal phase, K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 and BaCO 3 The molar ratio is (3-x): (3-x): 6: 2x, x = 0.5; SiO in the glass phase 2 and H 3 BO 3 The molar ratio is 3:1, and the glass phase accounts for 40% of the total crystal phase and glass phase.

[0037] 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 ann...

Embodiment 2

[0041] 1) The KNN-based glass-ceramic material in this embodiment is 0.2:0.2:0.6:0.2:0.6:0.2 by the amount of substance, get K 2 CO 3 , Na 2 CO 3 , Nb 2 o 5 , BaCO 3 , SiO 2 , H 3 BO 3 and 0.2 mol% CeO 2 mix. At this time, in the crystal phase, K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 and BaCO 3 The molar ratio is (3-x): (3-x): 6: 2x, x = 1; SiO in the glass phase 2 and H 3 BO 3 The molar ratio is 3:1, and the glass phase accounts for 40% of the total crystal phase and glass phase.

[0042] 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 650°C for 7 hours to obtain the annealed glass;

[0043] 3) After holding at 850°C for 5h, cool down to room tempera...

Embodiment 3

[0046] 1) The KNN-based glass-ceramic material in this embodiment is 0.15:0.15:0.6:0.3:0.6:0.2 by the amount of substance, and K 2 CO 3 , Na 2 CO 3 , Nb 2 o 5 , BaCO 3 , SiO 2 , H 3 BO 3 and 0.2 mol% CeO 2 mix. At this time, in the crystal phase, K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 and BaCO 3 The molar ratio is (3-x): (3-x): 6: 2x, x = 1.5; SiO in the glass phase 2 and H 3 BO 3 The molar ratio is 3:1, and the glass phase accounts for 40% of the total crystal phase and glass phase.

[0047] 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;

[0048] 3) After holding at 850°C for 5h, cool down to room tem...

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Abstract

The invention relates to a KNN-based (sodium potassium niobate-based) energy storage microcrystalline glass material with ultralow dielectric loss and a preparation method. The microcrystalline glass material is prepared from a glass phase and a crystal phase through mixing, fusing, cooling and molding, annealing, carrying out crystallization heat treatment, wherein according to mol percent, the glass phase accounts for 20 percent to 50 percent and the balance is the crystal phase; the crystal phase is composed of K2CO3, Na2CO3, Nb2O5 and BaCO3 at a mol ratio of (3-x) to (3-x) to 6 to 2x and x is more than 0 and less than or equal to 2.5. The KNN-based energy storage microcrystalline glass material prepared by the preparation method has extremely low dielectric loss; BaO is introduced, has the effect of adjusting the composition of the crystal phase of a sodium potassium niobate system and also has a certain promotion effect on a devitrification process and devitrification is accelerated by rare-earth metal ions; the BaO can also generate a pinning effect, and adverse impacts, caused by interface polarization, on breakdown and worsening are weakened; finally, the microcrystalline glass material with a high dielectric constant is obtained.

Description

【Technical field】 [0001] The invention relates to the field of glass-ceramic materials, in particular to a KNN-based energy-storage glass-ceramic material with ultra-low dielectric loss and a preparation method thereof. 【Background technique】 [0002] Pulse power supply is the core technology of pulse power system. Capacitor is an important energy storage component of pulse power system, and high specific energy capacitor is one of the key factors restricting the success of high-power pulse technology. Therefore, high specific energy capacitor dielectric materials have become a research hotspot in developed countries such as the United States [1]. (Smith, N.J., B. Rangarajan, M.T. Lanagan, C.G. Pantano. Alkali-free glass as a high energy density dielectric material [J]. Materials Lerrers, 2009, (63): 1245-1248.) [0003] Although foil structure capacitors or metallized film capacitors currently used in high-power pulse power supply systems have been mass-produced, the energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02C03C6/04C03C4/16
Inventor 蒲永平郑晗煜
Owner SHAANXI UNIV OF SCI & TECH
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