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ZnO-containing sealing microcrystalline glass, and preparation and using methods thereof

A technology of glass-ceramics and glass sealing, which is applied in the field of solid oxide fuel cells, can solve the problems of affecting the airtightness of sealing materials, the attenuation of cathode catalytic performance, and reducing the thermal stability of glass, achieving low cost and improving thermal expansion coefficient Matching degree, the effect of reducing volatility

Active Publication Date: 2014-03-19
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 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 in 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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  • ZnO-containing sealing microcrystalline glass, and preparation and using methods thereof
  • ZnO-containing sealing microcrystalline glass, and preparation and using methods thereof
  • ZnO-containing sealing microcrystalline glass, and preparation and using methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Preparation and sealing of materials

[0031] 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 , ZnO), 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 1350°C at 3°C / min, and keep it warm for 1 hour; then, take it out Crucible, the melt is poured into deionized water for rapid cooling, and dried to obtain fragments of the glass melt; ground and passed through a 100-mesh sieve to obtain glass powder. Mix glass powder with polyvinyl alcohol, fish oil, ethanol and toluene (80%, 2%, 1%, 10%, 7% 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

[0032] Embodiment 2: Preparation and sealing of materials

[0033] 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 , ZnO), 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 1340°C at 3°C / min, and keep it warm for 1 hour; then, take it out Crucible, the melt is poured into deionized water for rapid cooling, and dried to obtain fragments of the glass melt; ground and passed 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 an...

Embodiment 3

[0034] Embodiment 3: Preparation and sealing of materials

[0035] 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 , ZnO), 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 1325°C at 3°C / min, and keep it for 1 hour; then, take it out Crucible, the melt is poured into deionized water for rapid cooling, and dried to obtain fragments of the glass melt; ground and passed through a 100-mesh sieve to obtain glass powder. Mix glass powder with epoxy resin, polyacrylamide, isopropanol and toluene (84%, 1.5%, 0.5%, 9%, 5% by weight) to form a slurry, and disperse evenly in a ball mill; casting Shape, dry naturally, and then cut into the desired shape of the embryo body; place the embryo body on the part to be sealed, heat up at a rate of 2°C / min in an ele...

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Abstract

The invention discloses ZnO-containing sealing microcrystalline glass, and preparation and using methods thereof. The ZnO-containing sealing microcrystalline glass comprises the following raw materials: B2O3, Al2O3, SiO2, MO (one or more of MgO, CaO, SrO and BaO) and ZnO with the molar ratio of (0-10): (0-5): (25-60): (20-50): (5-30). As the ZnO is added, the formation of CaB2O4 crystals in the glass can be promoted, the volatilization of a B-containing substance in the sealing glass in a working environment can be significantly reduced, and the thermal stability of the sealing glass and the chemical compatibility of the sealing glass with a cathode are further improved; and simultaneously, by adding the ZnO, the formation of Ca2ZnSi2O7 crystals in the glass can also be promoted so as to be conductive to improving the thermal expansion coefficient matching degree of the sealing glass with other SOFC (solid oxide fuel cell) components. The ZnO-containing sealing microcrystalline glass disclosed by the invention has the advantages of simple preparation raw materials, easiness in obtainment of the raw materials and stable process, an invert glass grid structure taking SiO2 as a main body is obtained, the cost is low, the process is simple and feasible, and practical and industrial conditions are further achieved.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, and in particular relates to a ZnO-containing sealing glass-ceramic with high-temperature thermal stability and a preparation and use method thereof. 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 strong fuel adaptability (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 temperature and the interaction between the sealing material and the cathode. Due to the high operating temperature of the battery (700-750°C), the selection of suitable sealing materials has become the key to restricting the development of planar SOFCs. The study found that by regulating the B 2 o 3 / SiO 2 ratio to obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/00C03C8/24
Inventor 张腾陈顺润张琪陈嘉琳唐电
Owner FUZHOU UNIV
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