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A medium-high temperature SOFC sealing glass-ceramic and sealing material, preparation method and use method

A technology of glass-ceramics and sealing materials, applied in sealing/supporting devices, fuel cell components, etc., can solve problems affecting the airtightness of sealing materials, attenuation of cathode catalytic performance, and reducing the thermal stability of glass, etc. Achieve the effects of low cost, improved thermal stability, and stable crystal phase

Active Publication Date: 2022-05-24
GLASS TECH RES INST OF SHAHE CITY OF HEBEI PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, our research group found that borosilicate glass sealing materials in the SOFC operating environment, due to the volatilization of boron-containing substances (J. Am. Ceram. Soc., 2008, Volume 91, Issue 8, P2564 - 2569) seriously Reduce the thermal stability of the glass itself, and at the same time, the volatilization of boron-containing substances will also lead to the generation of a large number of holes in the sealing glass, affecting the airtightness of the sealing material; in addition, recent related studies have also found that borosilicate glass During the operation of SOFC, the boron-containing substances of the sealing material volatilize violently and then deposit on the cathode and react with it, resulting in a serious attenuation of the catalytic performance of the cathode (J. Electrochem. Soc. 2013, Volume 160, Issue 3, PF301 -F308. )

Method used

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  • A medium-high temperature SOFC sealing glass-ceramic and sealing material, preparation method and use method
  • A medium-high temperature SOFC sealing glass-ceramic and sealing material, preparation method and use method
  • A medium-high temperature SOFC sealing glass-ceramic and sealing material, preparation method and use method

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preparation example Construction

[0034] A preparation method for preparing a sealing material by using medium and high temperature SOFC sealing glass-ceramics comprises the following steps:

[0035] 1) Mix the glass-ceramic raw materials evenly, melt at 1250-1480 ℃, and keep the holding time for 1-4 hours; quench the melted glass liquid to obtain glass frit, and then pulverize, grind or ball mill the glass frit, After sieving, glass powder is obtained;

[0036] 2) Mix glass powder with binder, dispersant and solvent to form slurry, ball mill in a ball mill for uniform dispersion, tape-cast molding, dry naturally, and then cut into a desired shape of the embryo to make glass sealing material.

[0037] Table 1 Composition of the sealing glass-ceramics in the examples (molar ratio)

[0038]

Embodiment 1

[0040]According to the ratio of each component in Table 1, take a certain amount of analytically pure raw materials, and mix them uniformly with a planetary ball mill for 1 hour; Heating to 1450°C / min for 1.5 hours; then, taking out the crucible, pouring the melt into deionized water for water quenching, drying to obtain fragments of glass melt; grinding and passing through a 200-mesh sieve to obtain glass powder. The glass powder is mixed with epoxy resin, terpineol and polyvinyl alcohol (weight ratios are 80%, 3%, 2%, 15% in turn) into a slurry, which is uniformly dispersed by ball milling in a ball mill; Then cut the embryo into the desired shape; place the embryo on the part to be sealed, heat up at a rate of 8°C / min in an electric furnace, keep at 900°C for 30 minutes, and then naturally cool down to 850°C for 2 hours of crystallization. The sealing is completed. figure 1 It is shown that the glass transition point of the sealing glass of this example is 730.7°C, and the...

Embodiment 2

[0042] According to the ratio of each component in Table 1, take a certain amount of analytically pure raw materials, and mix them uniformly with a planetary ball mill for 1.5 hours; Heating to 1400°C at 4°C / min and holding for 2 hours; then, take out the crucible, pour the melt into deionized water for rapid cooling, and dry to obtain fragments of glass melt; grind and pass through a 200-mesh sieve to obtain glass powder. Mix glass powder with methyl cellulose, polyvinyl alcohol, n-butanol and ethanol (the weight ratio is 81%, 3%, 3%, 8%, 5% in turn) into a slurry, and ball mill in a ball mill to uniformly disperse; Shape, dry naturally, and then cut into the desired shape of the embryo; place the embryo on the part to be sealed, heat up at a rate of 10°C / min in an electric furnace, keep at 850°C for 40 minutes, and then naturally cool down to 800°C After 3 hours of crystallization, the sealing is completed. This example is a preferred composition. figure 1 It is shown that...

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Abstract

The invention discloses a sealing glass-ceramic with high thermal stability under medium-high temperature SOFC working environment, a sealing material, a preparation method and a use method. The raw materials are composed of SiO2, Al2O3, MO and additives. The glass system of the present invention does not contain B, which completely solves the volatilization of B-containing substances in the sealing glass in the working environment, greatly improves the thermal stability of the sealing glass itself and its chemical compatibility with the cathode, and the thermal expansion coefficient after sealing >10.5×10‑6 / °C, stable crystal phase, simple raw materials for preparation, low cost, easy availability, stable process, and reached the conditions for practical and industrialization.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, and in particular relates to a sealing glass-ceramic and a sealing material with high thermal stability in a medium-high temperature SOFC working environment, a preparation method and a use method. Background technique [0002] Solid oxide fuel cells (SOFC) use solid oxide (ceramic) electrolytes and operate at high temperatures, with high power generation efficiency, low material cost, and strong fuel adaptability (such as methane, gas, methanol, alcohol, petroleum liquefied gas, etc.) Etc. However, the main problem facing the development of SOFC is how to effectively isolate and seal the fuel gas and oxidizing gas at high temperature and the interaction between the sealing material and the cathode. Due to the high operating temperature of the battery (700-850 °C), the selection of suitable sealing materials has become the key to restricting the development of flat-panel SOFCs. [0003] Si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/06C03C8/24H01M8/0282
CPCC03C10/0036C03C8/24H01M8/0282
Inventor 王兵兵袁坚信彩丽马利特
Owner GLASS TECH RES INST OF SHAHE CITY OF HEBEI PROVINCE
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