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Compressed sealing material for solid oxide fuel cell stack and preparation method of compressed sealing material

A solid oxide, fuel cell stack technology, used in fuel cells, fuel cell parts, sealing/supporting devices, etc. Low cost, stable and reliable quality, simple preparation effect

Inactive Publication Date: 2018-05-18
武汉华科福赛新能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glass in glass sealing materials is a thermodynamically metastable phase. Under long-term high temperature conditions, there is a tendency to transform to a more stable crystal phase, which may cause changes in volume, thermal expansion coefficient, and internal stress, thereby shortening the service life. Effective Sealing During Operation of Solid Oxide Fuel Cells

Method used

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  • Compressed sealing material for solid oxide fuel cell stack and preparation method of compressed sealing material
  • Compressed sealing material for solid oxide fuel cell stack and preparation method of compressed sealing material
  • Compressed sealing material for solid oxide fuel cell stack and preparation method of compressed sealing material

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example 1～4

[0036] Preparation of Example 1~4h-BN-based sealing material

[0037] According to the ratio of raw materials in Table 1, the required raw materials were weighed according to the total amount of 100g. Add 300g zirconia balls into the ball mill tank as the ball milling medium, mix ethanol and xylene solution as the solvent, use herring oil as the dispersant, add the powder and ball mill for 12 hours, then use polyvinyl butyral (PVB) as the bond Agent, polyalkylene glycol and butyl benzyl ester as plasticizer, cyclohexanone as defoamer, added to the mixed slurry for ball milling for 12 hours, then added a certain amount of solvent to continue ball milling for 24 hours; in the process of ball milling, ZrO 2 The ball is the ball milling medium, and the ratio of the ball milling beads to the added powder is about 3:1. After ball milling to become a homogeneous slurry, vacuum degassing is used to form a plain embryo with controllable thickness and smooth surface by using a precision...

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Abstract

The invention discloses a compressed sealing material for a solid oxide fuel cell stack and a preparation method of the compressed sealing material. An h-BN based sealing material is formed by combining 80-100wt% of h-BN ceramic micro powder and 0-20wt% of glass micro powder, wherein the thickness of the h-BN based sealing material is 0.25-0.3 millimeter, the grain size of the h-BN ceramic micro powder is 5-8 micrometers, the thermal expansion coefficient is 10.3*10<-6>K<-1>, the glass micro powder is selected from a SiO2-Na2O-K2O3 system, and the average grain size is 5 micrometers. The h-BNbased sealing material is used as a matrix, glass micro powder in different proportions is added, reliable sealing of the sealing material in the stack is achieved, the air leakage rate of the sealingmaterial can be effectively reduced, the high-temperature dynamic performance is improved, and a favorable sealing effect is further provided.

Description

technical field [0001] The invention belongs to the field of energy technology, and in particular relates to a compression sealing material for a solid oxide fuel cell stack and a preparation method thereof. Background technique [0002] The solid oxide fuel cell is a power generation device that directly converts the chemical energy in the fuel into electrical energy, and the combined heat and power can increase the conversion efficiency to 80%. From the perspective of research trends at home and abroad, medium and low temperature planar solid oxide fuel cells are the mainstream of current research, and their advantages are mainly high power density of single cells and low production costs. The solid oxide fuel cell stack is mainly composed of single cells and connectors in series. The working temperature is between 600°C and 850°C. The dual functions of sealing and insulation are realized between the single cells and the connectors by applying high-temperature sealing mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0282H01M8/2465
CPCH01M8/0282H01M8/2465Y02E60/50
Inventor 蒲健王晓春李箭池波颜冬杨佳军贾礼超
Owner 武汉华科福赛新能源有限责任公司
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