Glass-glass composite sealing material and its preparation method and application

A technology of composite sealing and sealing material, applied in the field of materials, can solve the problems of poor compatibility, serious chemical reaction, and narrow temperature range of sealing materials, and achieve the effects of avoiding poisoning, simple preparation method and avoiding poor compatibility.

Active Publication Date: 2019-01-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of poor compatibility between different components in the composite sealing material, narrow applicable temperature range of the sealing material, serious chemical reaction with adjacent parts, etc., in view of the deficiencies of the existing sealing technology, and provide a Glass-glass composite sealing material with low transition temperature, high softening temperature, stable chemical properties, and good chemical compatibility with other parts

Method used

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  • Glass-glass composite sealing material and its preparation method and application
  • Glass-glass composite sealing material and its preparation method and application
  • Glass-glass composite sealing material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Preparation of glass powder:

[0038] Preparation of low softening point glass: SiO by molar ratio 2 : Na 2 O: CaO: Al 2 o 3 : La 2 o 3 =50:25:20:3:2 Weigh SiO 2 、Na 2 CO 3 , CaCO 3 、Al 2 o 3 and La 2 o 3 . The raw materials were ball milled on a planetary ball mill for 24 hours, and the mixture was dried and placed in a platinum crucible, and then melted at high temperature in a crucible frit furnace. The temperature rise system adopted is: raise the temperature to 1100°C at a heating rate of 10°C / min and hold it for 1 hour to ensure the complete decomposition of carbonate in the raw material; then raise the temperature to 1300°C at a heating rate of 5°C / min and keep the temperature for 2 hours To ensure that the glass is completely melted; take out the crucible from the furnace and quickly pour it into cold water for quenching to obtain a glass frit. The glass frit was dried at 60° C., crushed, ground, and passed through a 400-mesh sieve to obtain a...

Embodiment 2

[0043] (1) Preparation of glass powder:

[0044] Preparation of low softening point glass: SiO by molar ratio 2 :B 2 o 3 :CaO:Al 2 o 3 : CeO 2 =28:20:45:5:2 Weigh SiO 2 、H 3 BO 3 , CaCO 3 、Al 2 o 3 and CeO 2 . The raw materials were ball milled on a planetary ball mill for 24 hours, and the mixture was dried and placed in a platinum crucible, and then melted at high temperature in a crucible frit furnace. The heating system adopted is: raise the temperature to 1100°C at a heating rate of 10°C / min and hold it for 1 hour to ensure the complete decomposition of carbonate and boric acid in the raw materials; then raise the temperature to 1250°C at a heating rate of 5°C / min, Keep the temperature constant for 2 hours to ensure that the glass is completely melted; take out the crucible from the furnace and quickly pour it into cold water for quenching to obtain a glass frit. The glass frit was dried at 60° C., crushed, ground, and passed through a 400-mesh sieve to obta...

Embodiment 3

[0049] (1) Preparation of glass powder:

[0050] Preparation of low softening point glass: SiO by molar ratio 2 :K 2 O: CaO: Al 2 o 3 : Sm 2 o 3 =43:25:20:10:2 Weigh SiO 2 、K 2 CO 3 , CaCO 3 、Al 2 o 3 and Sm 2 o 3 . The raw materials were ball milled on a planetary ball mill for 24 hours, and the mixture was dried and placed in a platinum crucible, and then melted at high temperature in a crucible frit furnace. The heating system adopted is: raise the temperature to 1100°C at a heating rate of 10°C / min and hold it for 1 hour to ensure the complete decomposition of the carbonate in the raw material; then raise the temperature to 1300°C at a heating rate of 5°C / min and keep the temperature for 2 hours To ensure that the glass is completely melted; take out the crucible from the furnace and quickly pour it into cold water for quenching to obtain a glass frit. The glass frit was dried at 60° C., crushed, ground, and passed through a 400-mesh sieve to obtain a glass ...

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Abstract

The invention belongs to the field of materials, and in particular relates to a glass-glass composite sealing material and its preparation method and application. The glass-glass composite sealing material is composed of 20-90wt.% low softening point glass and 10-80wt.% high softening point glass Low softening point glass has a lower transition temperature, and high softening point glass has a higher softening temperature. The combination of the two broadens the applicable temperature range of the sealing material and ensures that the sealing material has good performance in a wide temperature range. sealing effect. The sealing material adopts simple raw materials, convenient preparation and use process, low cost, and is suitable for sealing solid oxide fuel cell stacks.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a glass-glass composite sealing material and its preparation method and application, and is especially suitable for high-temperature sealing between solid oxide fuel cell (SOFC) ceramic parts and stainless steel connectors. Background technique [0002] Solid oxide fuel cell (SOFC) is a green, clean, safe and reliable energy conversion device, which converts the chemical energy stored in the fuel directly into electrical energy without going through the Carnot cycle, which greatly improves the utilization of fuel. In recent years, great progress has been made in key materials and system integration, but the high-temperature sealing problem of batteries has not been solved, which is also one of the main factors limiting the commercialization of SOFC. [0003] In the SOFC system, the main function of the sealing material is to provide a reliable seal, to ensure that oxygen and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C8/24H01M8/10H01M8/028
CPCY02E60/50
Inventor 程谟杰王秀玲区定容
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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