Sealing material for medium/low-temperature solid oxide fuel battery and preparation method thereof

Abstract

The invention relates to a sealing material for a medium/low-temperature solid oxide fuel battery and a preparation method thereof. The sealing material comprises the following components in molar percentage: 28-38 percent of SiO2, 5-15 percent of B2O3, 30-40 percent of BaO, 0-10 percent of Al2O3, 0-5 percent of ZrO2, 0-16 percent of CaO, 0-15 percent of ZnO, 0-0.5 percent of NiO, 0-0.5 percent of Cr2O3 and 0-0.5 percent of Co2O3. The sealing material is applicable for the medium/low-temperature solid oxide fuel battery; and at the working temperature of the medium/low-temperature solid oxide fuel battery, the change of the thermal expansion coefficient of the sealing material is small in the long-term thermal treatment, and an electric pile is very stable in multiple thermal cycles and long-term running process.

Description

technical field [0001] The invention belongs to the field of fuel cells and relates to a sealing material for fuel cells, in particular to a glass-based sealing material suitable for medium and low temperature solid oxide fuel cells and a preparation method thereof. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy into electrical energy. It has the characteristics of high energy conversion efficiency and low pollution emissions, and meets the development needs of green energy in the 21st century. Among them, the solid oxide fuel cell (SOFC, Solid Oxide Fuel Cell) uses ceramic materials as the electrolyte, has an all-solid structure, higher energy conversion efficiency, does not use noble metal catalysts, and has wide fuel adaptability (it can directly use carbon through internal reforming) Hydrogen fuel, such as coal gas, natural gas, gasoline, petroleum liquefied gas and other fuel gases), environmentally friendly...

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Problems solved by technology

[0008] These studies have revealed some deficiencies in the existing glass-based sealing materials: such as the long-term thermal stability of the material at the service temperature, that is, the thermal stability of the glass-based sealing material at the service temperature is often not considered, especially When used for sealing of medium and low temperature SOFC

Many studies have mentioned that with the increase of the holding time, the sealing material will continue to crystallize, and the type, quantity, and particle size of the crystal phase will change, resulting in a significant change in the thermal expansion coefficient of the material. Poor matching of components, greatly reducing thermal cycle performance and causing seal failure

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