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

A solid oxide and fuel cell technology, which is applied to fuel cell components, chemical instruments and methods, and other chemical processes, can solve problems such as poor stability of sealing materials, damage to battery components, and poor thermal performance matching. Good airtightness, extended battery life, and improved performance

Inactive Publication Date: 2005-08-31
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, mix it with a planetary ball mill for 4 hours, take it out and put it in a graphite crucible, melt it in a high temperature program furnace at 1500 °C for 5 hours, and quench it in ice water Take it out, dry it at a temperature of 40-60°C and grind it into powder with a ball mill, sieve it with a 200-mesh sieve, and obtain the glass powder to be used. Grind in a mortar for 10 minutes to make it evenly mixed, then weigh terpineol with 19 times the mass of ethyl cellulose, and mix the three substances to form a viscous paste to 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, mix it with a planetary ball mill for 4 hours, take it out and put it in a graphite crucible, melt it in a high temperature program furnace at 1500 °C for 5 hours, and quench it in ice water Take it out, dry it at a temperature of 40-60°C and grind it into powder with a ball mill, sieve it with a 200-mesh sieve, and obtain the glass powder to be used. Grind in a mortar for 10 minutes to make it evenly mixed, then weigh terpineol with 19 times the mass of ethyl cellulose, and mix the three substances to form a viscous paste to 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, mix it with a planetary ball mill for 4 hours, take it out and put it in a graphite crucible, melt it in a high temperature program furnace at 1500 ℃ for 5 hours, and quench it in ice water Take it out, dry it at a temperature of 40-60°C and grind it into powder with a ball mill, sieve it with a 200-mesh sieve, and obtain the glass powder to be used. Grind in a mortar for 10 minutes to make it evenly mixed, then weigh terpineol with 19 times the mass of ethyl cellulose, and mix the three substances to form a viscous paste to 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 for solid oxide fuel cells and a preparation method, and the sealing material belongs to inorganic non-metallic materials. (2) Background technology: [0002] 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 The electrochemical reaction of ) 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 properties of the sealing material should be matched with other components and have good thermal and chemical stability. [0003] The prior art similar to the present invention has BaO-Al 2 O 3 -SiO 2 System Sealing Materials and CaO-Al 2 O 3 -SiO 2 System sealing material, of which 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 Applications(China)
IPC IPC(8): C09K3/10H01M8/0282
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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