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Mesotherm hermetic glass and hermetic method for solid oxide fuel cell

A sealing glass, medium temperature technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of not involving the thermal stability of sealing glass, not considering the thermal stability of sealing glass, etc.

Inactive Publication Date: 2008-03-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing sealing glass also has obvious shortcomings: that is, the thermal stability of the sealing glass at the service temperature is not considered
The reason is that two crystalline phases of barium feldspar are precipitated in the glass at 800°C: celsian and hexacelsian, and their thermal expansion coefficients are 2.0×10 -6 K -1 and 8.0×10 -6 K -1 , and as the heat treatment time prolongs, the metastable hexacelsian will eventually transform into a stable celsian, thus causing the thermal expansion coefficient of the glass to gradually decrease with time (Journal of the American Ceramic Society, 2004, 87, 254-260)
[0005] At present, patents on sealing glass for SOFC, such as CN1469497A, CN1234617A, CN1414646A, CN1465647A, CN02147179.7, US6475938, US6291092, US6541146, US5453331 mentioned above, do not involve the thermal stability of sealing glass

Method used

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  • Mesotherm hermetic glass and hermetic method for solid oxide fuel cell
  • Mesotherm hermetic glass and hermetic method for solid oxide fuel cell
  • Mesotherm hermetic glass and hermetic method for solid oxide fuel cell

Examples

Experimental program
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Effect test

preparation example Construction

[0022] Examples 1-11 Preparation of medium temperature sealing glass

[0023] According to the mole percentage of each component of each embodiment listed in Table 1, take a certain amount of analytically pure SiO 2 , B 2 o 3 、BaCO 3 , La 2 o 3 , Y 2 o 3 , ZrO 2 、TiO 2 and ZnO were fully mixed and ground by a planetary ball mill respectively, and then taken out and dried; the powders were respectively placed in a platinum alloy dry pot and placed in a box-type resistance furnace, and the temperature was raised to 1300°C to 1500°C in an air atmosphere, and the temperature was constant for 2 ~4 hours, then take it out at 1100°C and pour it into cold water for rapid cooling to form small pieces of medium-temperature sealing glass clinker; after crushing, pass through a 50-500 mesh standard sieve to make medium-temperature sealing glass powder for use.

[0024] Table 1. Medium temperature sealing glass composition table (mole percentage)

[0025] SiO 2

[0...

Embodiment 12

[0027] Embodiment 12 Long-term thermal stability test:

[0028] After the glass is made at 1300°C, the glass in the molten state is lowered to the heat treatment temperature (700°C and 800°C) with the furnace temperature, and kept at the heat treatment temperature for 100h, 300h and 500h respectively to study the thermal expansion coefficient of the glass. Changes in heat treatment time: Cut the glass into a rectangular parallelepiped with a length of 15 mm and a width of 4 mm, and use a high-temperature dilatometer (L75 / 1550, LINSEIS, Germany) to test the thermal expansion coefficient of the glass before and after heat treatment. Figure 2 is a comparison of the unit thermal expansion of a medium-temperature sealing glass prepared in Example 10 before and after heat treatment at 700°C for 500 hours and that of 8YSZ. It can be seen that after 500 hours of heat treatment, the medium-temperature sealing glass has no obvious expansion per unit length changes, and are close to the ...

Embodiment 13

[0029] Embodiment 13 Preparation of sealed body

[0030] Add 30.0 g of the medium-temperature sealing glass frit prepared in Examples 1-11 to a solution consisting of 8.0 g of methacrylamide, 0.8 g of nitrogen-nitrogen dimethylbisacrylamide, 0.8 g of gum arabic, and 15 g of distilled water to form a slurry material; put the slurry in a ball mill to fully grind it, add 0.1g of ammonium persulfate, then cast the slurry into a custom-made mold, put the mold in a 60°C oven to cure for 30min, and wait for the monomers in the slurry to polymerize Afterwards, the formed sealing glass blank is dried, and the dried blank is cut into a shape required for sealing as shown in FIG. 5 to obtain a sealing blank. See Table 2 for other examples.

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Abstract

This invention relates to a kind of middle temperature sealed glass and sealing method used in solid oxide fuel cell. The component and mole percent of glass are: SiO2 20-40%, B<2O3 5%-40%, BaO 10%-45%, La2O<3 0-11%, Y<2O3 0-10%, ZrO2 1-15%, TiO2 0-10%, ZnO 0-30%. The sealing process is: crush the produced glass and reserve; mix the produces glass powder and dispersing agent, monomer, crosslinking agent and distilled water to form size, after which ball-mill evenly dispersed in ball mill. Then, they are cast into the mould after adding initiator or catalyst. Next, they are put in the oven to solidify. The monomer polymerize to sealed glass base. It is cut into sealing base after drying; the produced sealing base is positioned between pending sealed parts. The sealing of pending sealed parts is achieved during the process of warming, heat preservation, warming again and heat preservation again.

Description

technical field [0001] The invention relates to a medium-temperature sealing glass and a sealing method for a solid oxide fuel cell (SOFC). Background technique [0002] Solid oxide fuel cells (SOFCs) have high energy conversion efficiency and are environmentally friendly (SO x , NO x ), low emissions, no noise pollution), wide fuel adaptability (including natural gas, gasoline, liquefied petroleum gas and other fuels can be directly used through internal reforming), and other outstanding advantages, it is recognized as a high-efficiency green energy. SOFC has two structures: plate type and tube type. Plate type SOFC has the advantages of high power density, simple preparation process, and low preparation cost. Medium temperature (600-800°C) plate type SOFC is currently a hot spot in SOFC research at home and abroad. One of the difficulties of plate-type SOFC is the need for sealing. Although the research on plate-type SOFC has successfully solved many technical challenges...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/08C03C3/062C03C8/10
CPCC03C3/064C03C3/066C03C3/068
Inventor 朱庆山彭练黄文来谢朝晖
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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