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A sealing glass-ceramic modified by co-doping with ce and hf

A glass-ceramic and co-doping 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, making it difficult to meet the high insulation of sealing materials, and reducing the insulation of sealing materials. Achieve the effects of inhibiting high temperature interface reaction, low cost, and improving high temperature insulation

Inactive Publication Date: 2017-07-04
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 alkali metals and alkaline earth metals) used to improve the viscosity of the sealing glass react easily with the Cr-containing alloy linker at the operating 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), resulting in a thermal expansion coefficient mismatch with other components of the sealing interface, destroying the bonding force of the seal, and seriously restricting the service life of the sealing material and SOFC, especially the stability in the thermal cycle process.
At the same time, the migration speed of network ligand ions (such as alkali metals and alkaline earth metals) is accelerated under high temperature conditions, resulting in a significant decrease in the insulation of sealing materials, making it difficult to meet the high insulation requirements of sealing materials

Method used

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  • A sealing glass-ceramic modified by co-doping with ce and hf
  • A sealing glass-ceramic modified by co-doping with ce and hf
  • A sealing glass-ceramic modified by co-doping with ce and hf

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Preparation and sealing of materials

[0032] 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 HfO 2 ), 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 at 3°C / min to 1350°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 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 at a rate of 2°C / min in an electric furna...

Embodiment 2

[0033] Embodiment 2: Preparation and sealing of materials

[0034] 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 2and HfO 2 ), 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 1380°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 required shape; place the embryo body at the part to be sealed, heat up in the electric furnace a...

Embodiment 3

[0035] Embodiment 3: Preparation and sealing of materials

[0036] 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 HfO 2 ), 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 an ...

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Abstract

The invention discloses a Ce and Hf co-doped modified sealing glass-ceramic. The Ce and Hf co-doped modified sealing glass-ceramic comprises the following raw materials in mole percentage by weight: 0-10% of B2O3, 0-10% of Al2O3, 25-40% of SiO2, 30-50% of MO ( one or more of MgO, CaO, SrO and BaO), and 5-30% of RO2 (CeO2 and HfO2). Through the co-doping of the CeO2 and HfO2, the generation of high-impedance-phase Ce0.5Hf0.5O2 is promoted, and the high temperature insulativity and the high temperature chemical stability of the sealing glass-ceramic are obviously improved. The preparation raw materials of the Ce and Hf co-doped modified sealing glass-ceramic are simple and easy to obtain, the process is stable, simple and feasible, the cost is low, and practical and industrial conditions can be met.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cells, in particular to a Ce and Hf 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. Among them, the interface reaction between the sealing glass and the alloy connector under high temperature conditions is one of the main bottlenecks restricting the commercializat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00C03C8/24
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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