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Medium and high temperature sealing method of plate type solid oxide fuel battery and its sealing material

A solid oxide, fuel cell technology, applied in solid electrolyte fuel cells, fuel cell components, chemical instruments and methods, etc., can solve the problems of concentration, deformation stress, complex sealing technology in the preparation process of sealant, etc. Simple process, good sealing performance, thermal matching performance and excellent chemical stability

Inactive Publication Date: 2008-11-26
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of sealant and its sealing technology are relatively complicated, especially the strict cleaning requirements of the sealing place restrict its application occasions
Because in order to further increase the power density of the current planar SOFC, the development trend is to thin the working layer (to reduce internal resistance), and the working layer of 30-50 μm is easily damaged during repeated cleaning with strong acid and strong alkali solutions.
At the same time, it is difficult to ensure that the paste sealant is applied evenly during the sealing process, and the lack of certain high-temperature dimensional stability will bring difficulties to the cooperation between the bipolar plate and the battery body
Moreover, the paste glue will shrink greatly when kept at high temperature for a long time, which will cause deformation and stress concentration, and eventually lead to sealing failure

Method used

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  • Medium and high temperature sealing method of plate type solid oxide fuel battery and its sealing material
  • Medium and high temperature sealing method of plate type solid oxide fuel battery and its sealing material
  • Medium and high temperature sealing method of plate type solid oxide fuel battery and its sealing material

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Embodiment Construction

[0024] specific implementation plan

[0025] Further illustrate substantive characteristics and remarkable progress of the present invention below in conjunction with specific example:

[0026] ①Preparation of sealing material

[0027] Take 15.0 grams of CaO, Al 2 o 3 5.6 g, SiO 2 60.6 grams, B 2 o 3 2.5g, ZnO5.8g, BaO3.7g, Na 2 O 3.3 g, K 2 O3.4 grams, mixed with 500 grams of zirconia balls, put into a 1000ml polytetrafluoroethylene ball mill jar, and mixed with a drum mill for 2 hours. Put the 100ml sintered quartz crucible into the electric furnace and raise the temperature to 1300°C. Put the powder into the crucible at 1300°C, then raise the temperature at 3°C / min to 1400°C for 2 hours, and stir once every 0.5 hours during the heat preservation period. After the melting is completed, cast the molten body on a hot iron plate at 150°C to 200°C to form a disc. After forming, put it into an electric furnace at 500°C for annealing for 10 hours, and then cool with the f...

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Abstract

A series of sealant materials suitable to 800-1000 deg.C are prepared by using microcrystalline glass in system of CaO-Al2O3-SiO2-B2O3. Range of softening temperature of the series of microcrystalline glass is 750-850 deg.C, and range of crystallizatino is 800-1000 deg.C. In warming up procedure, pristine glass softened at 750-850 deg.C is drenched and adhered with ZrO2 electrolyte and Ni-Cr material of bipolar plate. When temperature goes up continuously, integral recrystallization is occurred, and intensity of material is enhanced. Experiments prove that the material suits to sealing use at temperature 800-1000 deg.C: certain mechanical strength and size, wettability, coefficient of thermal expansion, chemical stability and good matching to materials of batteries. The invention possesses advantages of wide range of sealing temperature, easy manufacturing and sealing technique and high cost performance ratio.

Description

Technical field [0001] The invention relates to a medium-high temperature sealing method for a flat solid oxide fuel cell. Background technique [0002] Solid oxide fuel cell (SOFC) is highly efficient (not limited by Carnot cycle, thermoelectric efficiency can reach 70%-80%), environmentally friendly (no combustion process, almost no nitrogen and sulfur oxides), quiet ( No moving parts, low noise) and high reliability, it is called the green energy of the 21st century. Compared with other structures such as tubular, series-sealed and corrugated, the planar SOFC structure has the advantages of short current flow, uniform collection, and high battery power density. It has always been the main object of SOFC research and development. [0003] Due to the medium and high temperature, fuel gas (H 2 etc.) and oxidizing gases (O 2 etc.), if the parts of SOFC or the connection between different parts leak, and the two gases mix, the SOFC will not work, and in severe cases, it wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/10H01M2/08C09K3/10H01M8/0282H01M8/0286H01M8/12H01M50/191H01M50/198
CPCY02E60/12Y02E60/521Y02P70/50Y02E60/50
Inventor 郑锐温廷琏王大千吕之奕王绍荣聂怀文
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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