High temperature suitable sealing material in use for fuel cell of solid oxide and preparing method

A solid oxide, fuel cell technology, applied in fuel cell parts, chemical instruments and methods, and other chemical processes, etc., can solve problems such as poor stability of sealing materials, damage to battery components, poor thermal performance matching, etc. Good air tightness, prolong battery life, improve performance effect

Inactive Publication Date: 2006-11-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art close to the present invention has BaO-Al 2 o 3 -SiO 2 System sealing material and CaO-Al 2 o 3 -SiO 2 System sealing material, where BaO-Al 2 o 3 -SiO 2 The main components of the system sealing material include BaO, Al 2 o 3 , SiO 2 , the sealing material has good thermal performance matching, good oxidation-reduction resistance, and is easy to combine with ceramic material components, but this sealing material has poor stability. When the sealing temperature is slightly higher, the sealing material will appear loose. There is a serious air leak
CaO-Al 2 o 3 -SiO 2 The main components of the system sealing material include CaO, Al 2 o 3 , SiO 2 , the sealing material has the characteristics of good air tightness, high oxidation-reduction resistance, and easy combination with ceramic material components, but the thermal properties of this material and other battery components are poorly matched, and the battery components will be damaged during the heating and cooling process. damage to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take BaCO 3 : 49.8g, CaO: 2.52g, Al 2 o 3 : 9.0g, SiO 2 : 16.13g, La 2 o 3 : 12.15g, B 2 o 3 : 11.5g, after mixing evenly, put it into a 50ml agate ball mill jar, grind it with a planetary ball mill for 4 hours, take it out, put it in a graphite crucible, melt it at 1500°C in a high-temperature programmed furnace for 5 hours, and quench it in ice water Take it out, dry it at 40-60°C, grind it into powder with a ball mill, and sieve it with a 200-mesh sieve to obtain the glass powder to be used. Weigh the glass powder and ethyl cellulose according to the mass ratio of 100:1, and put it in the agate Grind in a mortar for 10 minutes to make it evenly mixed, then weigh terpineol with 19 times the mass of ethyl cellulose, mix the three substances evenly to form a viscous paste, and obtain a sealing material. The linear thermal expansion coefficient of this material is 12.13×10 -6 / K.

Embodiment 2

[0016] Take BaCO 3 : 50.99g, CaO: 2.37g, Al 2 o 3 : 8.3g, SiO 2 : 18g, La 2 o 3 : 10.6g, B 2 o 3 : 11.3g, after mixing evenly, put it into a 50ml agate ball mill jar, grind it with a planetary ball mill for 4 hours, take it out, put it into a graphite crucible, melt it in a high-temperature programmed furnace at 1500°C for 5 hours, and quench it in ice water Take it out, dry it at 40-60°C, grind it into powder with a ball mill, and sieve it with a 200-mesh sieve to obtain the glass powder to be used. Weigh the glass powder and ethyl cellulose according to the mass ratio of 100:1, and put it in the agate Grind in a mortar for 10 minutes to make it evenly mixed, then weigh terpineol with 19 times the mass of ethyl cellulose, mix the three substances evenly to form a viscous paste, and obtain a sealing material. The linear thermal expansion coefficient of this material is 11.35×10 -6 / K.

Embodiment 3

[0018] Take BaCO 3 : 51.5g, CaO: 2.0g, Al 2 o 3 : 10.4g, SiO 2 : 15.17g, La 2 o 3 : 11.07g, B 2 o 3 : 11.36g, after mixing evenly, put it into a 50ml agate ball mill jar, grind it with a planetary ball mill for 4 hours, take it out, put it into a graphite crucible, melt it in a high-temperature programmed furnace at 1500°C for 5 hours, and quench it in ice water Take it out, dry it at 40-60°C, grind it into powder with a ball mill, and sieve it with a 200-mesh sieve to obtain the glass powder to be used. Weigh the glass powder and ethyl cellulose according to the mass ratio of 100:1, and put it in the agate Grind in a mortar for 10 minutes to make it evenly mixed, then weigh terpineol with 19 times the mass of ethyl cellulose, mix the three substances evenly to form a viscous paste, and obtain a sealing material. The linear thermal expansion coefficient of this material is 10.34×10 -6 / K.

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Abstract

A refractory sealant for solid oxide type fuel battery is proportionally prepared from BaO, CaO, Al2O3, SiO2, La2O3 and B2O3 through mixing, high-temp fusing, breaking, classifying, and compounding. Its advantages are high mechanical strength, air tightness electric insulation and stability.

Description

(1) Technical field: [0001] The invention provides a sealing material and a preparation method of a solid oxide fuel cell. The sealing material belongs to inorganic non-metallic materials. (two) background technology: [0002] A solid oxide fuel cell (SOFC for short) is an energy conversion device that uses fuel gas (such as H 2 , CO, etc.) and oxidants (such as O 2 ) electrochemical reaction converts chemical energy into electrical energy. The working temperature of SOFC is generally 800-1000°C, and there are strong oxidizing and reducing gases. Structural and functional failures, even explosions. Therefore, the thermal expansion performance of the sealing material should be compatible with other components, and it should have good thermal and chemical stability. [0003] The prior art close to the present invention has BaO-Al 2 o 3 -SiO 2 System sealing material and CaO-Al 2 o 3 -SiO 2 System sealing material, where BaO-Al 2 o 3 -SiO 2 The main components of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/10H01M8/02H01M8/0282
CPCY02E60/50
Inventor 孙克宁孔江榕朴金花刘兰毅周德瑞
Owner HARBIN INST OF TECH
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