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Solid oxide fuel cell sealing material bettween 500-800 deg.C intermediate temperature and preparation method thereof

A solid oxide, fuel cell technology, used in solid electrolyte fuel cells, fuel cells, chemical instruments and methods, etc., can solve the problems of incomplete matching of expansion coefficients, cracking of glass sealing materials, mismatch of thermal expansion coefficients, etc. To achieve the effect of novel and reasonable preparation method and improved toughness

Inactive Publication Date: 2009-09-02
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, BaO-SiO is mainly used 2 -B 2 o 3 -Al 2 o 3 system, the main problem is that the chemical stability at high temperature is poor, it is easy to react with chromium in the connecting material, and the expansion coefficient of the connected parts cannot be completely matched, so that in the thermal cycle process due to the different expansion coefficients, resulting in Cracking of the glass sealing material due to stress
In order to solve the problem of mismatching thermal expansion coefficients, people use non-contact sealing, that is, the sealing effect is achieved by mica sheet bundles under a certain pressure, but when a certain pressure is applied, it is easy to cause the stress of the single cell to be weak. uniform and cracked

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019]Glass-ceramic material with a high softening point of 1000-1200°C is used to coat the zirconia-based material to form a material powder with a coated particle structure, and a glass-ceramic material powder with a low softening point of 700-1000°C as a binder Mix to make mixed powder, its weight ratio is 7~4:3~6, add ethanol and terpineol to the mixed powder body to make the content of powder body weight and be the paste slurry of 20~40%, then paste Coat the joints to be connected with the slurry to make a sealing strip, and then calcined together after drying. When calcining, first raise the temperature to 750-850°C, keep it warm for 2 hours, then raise the temperature to 1000-1100°C, and keep it warm for 6-8 hours. Hours, the sealing of the joint is completed. The steps of the specific preparation method are as follows:

[0020] (1) Mix and stir zirconium oxychloride and cerium nitrate or calcium nitrate according to the ion molar ratio of zirconium ions to cerium ions...

Embodiment 2

[0028] A glass-ceramic material with a high softening point of 1000-1200°C is used to coat the zirconia-based material to form a material with a coated particle structure, which is mixed with a glass-ceramic material with a low softening point of 700-1000°C as a binder to make powder body, its weight ratio is 7-4:3-6, adding ethanol to the powder body to make a slurry with a content of 1-10% of the powder weight, and then making the slurry into a sealing strip, which is connected with the The connecting parts are calcined together at a temperature of 900-1100° C. for 0.5-2 hours, and the sealing of the connecting parts is completed. The steps of the specific preparation method are as follows:

[0029] (1) zirconium oxychloride and or cerium nitrate, or calcium nitrate according to the ion molar ratio of zirconium ion and cerium ion, calcium ion respectively are 0.95~0.99: 0.01~0.05 mix, stir, add ammoniacal liquor, make the pH value of solution greater than 12. Form a hydroxi...

Embodiment 3

[0037] A glass-ceramic material with a high softening point of 1000-1200°C is used to coat the zirconia-based material to form a material with a coated particle structure, which is mixed with a glass-ceramic material with a low softening point of 700-1000°C as a binder to make powder body, its weight ratio is 7-4:3-6, adding ethanol to the powder body to make a slurry with a content of 1-10% of the powder weight, and then making the slurry into a sealing strip, which is connected with the The connecting parts are calcined together at a temperature of 900-1100° C. for 0.5-2 hours, and the sealing of the connecting parts is completed. The steps of the specific preparation method are as follows:

[0038] (1) Mix and stir zirconium oxychloride and cerium nitrate or calcium nitrate according to the ion molar ratio of zirconium ions to cerium ions and calcium ions respectively at 0.95~0.99:0.01~0.05, add ammonia water, and make the pH value of the solution greater than 12 , forming...

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Abstract

This is a sealing material for 500-800oC fuel cell and its process method. A glass-ceramic material of high soft point is used to wrap the zirconia and forming a powder material and mixed with binder material of glass-ceramic. A slurry of 20-40% powder content is made by adding ethanol and terpineol to the mixed material, and is coated to the jointing element to make a sealing strip. Dry and calcine the strip.

Description

technical field [0001] The invention relates to a glass-ceramic functional material and a preparation method, in particular to a 500-800°C medium-temperature solid oxide fuel cell sealing material and a preparation method. technical background [0002] Fuel cells have the advantages of high energy conversion efficiency, a wide range of fuel options, convenient operation, environmental friendliness, and durability. They are suitable for the construction of large, medium, and small power stations and even mobile power sources. They are universally recognized as green energy in the 21st century. In addition to the general advantages of fuel cells, intermediate temperature solid oxide fuel cells (SOFC) also have the following advantages: 1. No need to use noble metal catalysts, all-ceramic structure, greatly reducing the cost of preparation; 2. Wide range of fuel adaptability, fuel High conversion efficiency. The battery stack is composed of single cells, connecting materials a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/08H01M8/10C09K3/10C04B35/00H01M8/028H01M8/1253
CPCY02E60/522Y02E60/50Y02P70/50
Inventor 鲍巍涛
Owner HEFEI UNIV
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