Glass sealing material, as well as preparation and using methods thereof

A glass sealing and raw material technology, which is applied in the field of solid oxide fuel cells, can solve the problems of restricting the service life of sealing materials and SOFC, destroying the bonding force of sealing, and mismatching thermal expansion coefficients, so as to improve high-temperature chemical stability, reduce Sealing temperature, low cost effect

Inactive Publication Date: 2014-12-03
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the network ligand ions (such as group IIA) used to improve the viscosity of the sealing glass react easily with the Cr-containing alloy linker at the working temperature of the SOFC, forming such as BaCrO 4 , SrCrO 4 and CaCrO 4 etc. have extremely high coefficient of thermal expansion (18~20×10 -6 / K), which again causes the thermal expansion coefficient mismatch with other components of the sealing interface, destroys the bonding force of the seal, and seriously restricts the service life of the sealing material and SOFC, especially the stability in the thermal cycle process.

Method used

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  • Glass sealing material, as well as preparation and using methods thereof
  • Glass sealing material, as well as preparation and using methods thereof
  • Glass sealing material, as well as preparation and using methods thereof

Examples

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preparation example Construction

[0030] (1) Preparation of sealing glass: Mix the raw materials evenly; melt at 1300-1500°C and hold for 1-4 hours; quench the melted glass to obtain a glass frit; then, melt the glass block crushing, grinding or ball milling, and obtain glass powder after sieving;

[0031] (2) Preparation of glass embryo body: Mix glass powder with binder, dispersant and solvent to form a slurry, and disperse evenly by ball milling in a ball mill; tape casting, natural drying, and then cut into the embryo body of the desired shape, Made into glass sealing material.

[0032] The binder in step 2) includes one or more of epoxy resin, methyl cellulose, polyvinyl butyral, and polyvinyl alcohol. The dispersant in step 2) includes one or more of fish oil, polyacrylic acid, polyvinyl alcohol, and polyacrylamide. The solvent in step 2) is one or more of water, ethanol, isopropanol, n-butanol, toluene, xylene, and acetone.

[0033] The method of using the glass sealing material is to place the glass...

Embodiment 1

[0036] Embodiment 1: Preparation and sealing of materials

[0037] According to the ratio of each component in Table 1, weigh a certain amount of analytically pure raw materials (CaO, SrO, SiO 2 、Al 2 o 3 , B 2 o 3 , ZrO 2 or HfO 2 ), and mixed evenly with a planetary ball mill for 24 hours; then put the powder into a platinum crucible, place it in the air atmosphere of a box-type resistance furnace, heat it to 1300°C at 3°C / min, and keep it warm for 1 hour; 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 100-mesh sieve to obtain glass powder. Mix glass powder with polyvinyl alcohol, fish oil, ethanol and toluene (84%, 3%, 1%, 9%, 3% by weight) to form a slurry, and disperse evenly in a ball mill; tape casting, natural Dry, then cut into the embryo body of the desired shape; place the embryo body on the part to be sealed, heat up in an electric furnace at a rate of 2°C...

Embodiment 2

[0038] Embodiment 2: Preparation and sealing of materials

[0039] According to the ratio of each component in Table 1, weigh a certain amount of analytically pure raw materials (CaO, SrO, SiO 2 、Al 2 o 3 , B 2 o 3 , ZrO 2 or HfO 2 ), and mixed evenly with a planetary ball mill for 24 hours; then put the powder into a platinum crucible, place it in the air atmosphere of a box-type resistance furnace, heat it at 3°C / min to 1450°C, and keep it warm for 1 hour; 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 100-mesh sieve to obtain glass powder. Mix glass powder with methylcellulose, polyvinyl alcohol, n-butanol and acetone (82%, 2%, 2%, 8%, 6% by weight) to form a slurry, and disperse evenly in a ball mill; Stretching, drying naturally, and then cutting the embryo body into the desired shape; placing the embryo body on the part to be sealed, raising the temperature in a...

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Abstract

The invention discloses a glass sealing material, as well as preparation and using methods thereof. The material comprises the following raw materials by molar ratio: 0-15 parts of B2O3, 0-10 parts of Al2O3, 20-50 parts of SiO2, 10-25 parts CaO, 10-25 parts SrO, and 5-30 parts ZrO2 or HfO2. Due to the addition of the ZrO2 or the HfO2, a perovskite structure (ABO3) is formed, the diffusion of Cr ions to sealed glass in a Cr-containing stainless steel alloy connecting body is effectively reduced, and the high-temperature chemical stability of the sealed microcrystalline glass is significantly improved. The glass sealing material disclosed by the invention has the advantages of simple preparation raw materials, easiness in getting the raw materials, stable process, capability of getting an invert glass network structure taking the SiO2 as a main body, low cost, simple process and feasibility, and can achieve practical and industrial conditions.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, and in particular relates to a glass sealing material and a method for preparing and using the same. Background technique [0002] Solid oxide fuel cell (SOFC) adopts solid oxide (ceramic) electrolyte, operates at high temperature, has high power generation efficiency, low material cost, and is compatible with various fuels (such as methane, gas, methanol, alcohol, liquefied petroleum gas, etc. )Etc. However, the main problem facing the development of SOFC is how to effectively isolate and seal the fuel gas and oxidant gas at high temperatures. Due to the high operating temperature of the battery (700-750°C), the selection of suitable sealing materials and sealing technologies has become the key to restricting the development of planar SOFCs. In order to solve the problem of sealing failure between sealing materials and Cr-containing stainless steels, researchers at home and abroad have ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C8/24
Inventor 张腾陈嘉琳陈顺润唐电邹琦王欣邵艳群唐中帜
Owner FUZHOU UNIV
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