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A sealing glass-ceramic modified by co-doping of ce and la

A technology of glass-ceramics and co-doping, which is applied in the field of solid oxide fuel cells, can solve the problems of destroying the insulation of sealed glass-ceramics, and achieve the effects of low cost, simple preparation of raw materials, and stable process

Inactive Publication Date: 2017-08-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recent work of our research group found that adding a small amount of CeO 2 The sealing glass will precipitate CeO in the SOFC operating environment 2 even Ce 2 o 3 and other conductive phases, significantly destroying the insulation of the sealed glass-ceramic

Method used

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  • A sealing glass-ceramic modified by co-doping of ce and la
  • A sealing glass-ceramic modified by co-doping of ce and la
  • A sealing glass-ceramic modified by co-doping of ce and la

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: 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 , CeO 2 and La 2 o 3 ), use a planetary ball mill for 24 hours to mix evenly; then put the powder into a platinum crucible, place it in the air atmosphere of a box-type resistance furnace, heat it to 1400°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 (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...

Embodiment 2

[0034] Embodiment 2: 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 , La 2 o 3 ), use a planetary ball mill for 24 hours to mix evenly; then put the powder into a platinum crucible, place it in the air atmosphere of a box-type resistance furnace, heat it to 1400°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 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 electric...

Embodiment 3

[0036] Embodiment 3: 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 , CeO 2 and La 2 o 3 ), use a planetary ball mill for 24 hours to mix evenly; then put the powder into a platinum crucible, place it in the air atmosphere of a box-type resistance furnace, heat it to 1400°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 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...

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Abstract

The invention discloses a sealing glass-ceramic modified by co-doping of Ce and La. The raw material composition is B2O3 0-10%, Al2O3 0-10%, SiO2 30-40%, MO (MgO, One or more of CaO, SrO, BaO) 20~40% and RO (CeO2 and La2O3) 15~40%. The present invention obtains sealing glass with high concentration of Ce and La (>15 mole%) through the design of reverse glass. By exerting the coordinated effect of Ce and La, the network structure of the glass can be significantly enhanced, and its insulation and high-temperature chemical stability can be effectively improved. The preparation material of the invention is simple, easy to obtain, stable in process, low in cost, simple and feasible in process, and meets the conditions of practicality and industrialization.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, in particular to a Ce and La co-doped modified sealing glass-ceramic. 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. The main advantage of the solid oxide fuel cell is the high energy conversion rate, but the insufficient insulation of the sealing material is prone to leakage, which will not only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C8/24C03C10/00
Inventor 张腾刘鸿琳张琪赵丹丹颜佳佳杜欣航魏颖李巍婷张心愿唐电
Owner FUZHOU UNIV
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