Composite brazing filler metal system for self-adaptive sealing of intermediate temperature solid oxide fuel cells and brazing method thereof

A solid oxide, fuel cell technology, used in welding media, welding equipment, welding/cutting media/materials, etc., can solve problems such as thermal expansion coefficient mismatch, high SOFC connection temperature, insufficient reliability, etc. Deformation ability, avoid the effect of sudden increase in plastic deformation ability

Active Publication Date: 2017-07-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of insufficient reliability caused by the high connection temperature of the existing brazed joint sealed SOFC and the mismatch of thermal expansion coefficients between components, and to provide a composite material for self-adaptive sealing of medium temperature solid oxide fuel cells Brazing material system and its brazing method

Method used

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  • Composite brazing filler metal system for self-adaptive sealing of intermediate temperature solid oxide fuel cells and brazing method thereof
  • Composite brazing filler metal system for self-adaptive sealing of intermediate temperature solid oxide fuel cells and brazing method thereof
  • Composite brazing filler metal system for self-adaptive sealing of intermediate temperature solid oxide fuel cells and brazing method thereof

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specific Embodiment approach 1

[0020] Specific Embodiment 1: The composite solder system used for self-adaptive sealing of medium-temperature solid oxide fuel cells in this embodiment is composed of a prefabricated layer and an intermediate layer, and the prefabricated layer is a Cu thin layer vapor-deposited on the sealing position of the battery sheet and the connecting body , the middle layer is based on Ag-CuO solder mixed with Ag powder and CuO powder, and glass phase A with a glass softening temperature of 650-700°C and glass with a glass softening temperature of 750-800°C are added to the matrix. Phase B, wherein the content of CuO in the Ag-CuO solder is 1-15 mol%.

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment is different from Embodiment 1 in that the thickness of the thin copper layer is 1-2 μm.

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the addition amount of glass phase A accounts for 1~20wt% of the Ag-CuO solder, and the glass phase A is 5%~15% by mass percentage Li 2 O, 25% to 35% SiO 2 , 15% to 25% of BeO, 20% to 30% of B 2 o 3 And 10% to 15% of MgO composition.

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Abstract

The invention discloses a composite brazing filler material system for self-adaptive sealing of a medium-temperature solid oxide fuel battery and a brazing method the composite brazing filler material system, belongs to the field of solid oxide fuel batteries and aims to solve the problems that the existing brazing-connected and brazing-sealed SOFC is relatively high in connection temperature and the reliability is not enough because of mismatching of thermal expansion coefficients of components. The composite brazing filler material system is composed of a prefabricated layer and a middle layer, wherein the middle layer takes an Ag-CuO brazing filler material as a base body; the base body contains two types of glass phases which are different in glass softening temperature. The brazing method comprises the following steps: (1) performing vapor deposition to obtain a Cu film; (2) preparing a mixed glass phase; (3) adding the mixed glass phase into the Ag-CuO brazing filler material to prepare brazing filler material mixed powder; (4) preparing an adhesive; (5) mixing the brazing filler material mixed powder with the adhesive; (6) coating composite brazing filler material paste; (7) performing high-temperature brazing. According to the composite brazing filler material system and the brazing method disclosed by the invention, two types of glass phases are added to improve the plastic deformation capability of the composite brazing filler material system, so the reliability of sealed batch production of the SOFC.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, and in particular relates to a composite solder and a brazing method for realizing reliable self-adaptive sealing of medium-temperature solid oxide fuel cells. Background technique [0002] Solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) is a new type of energy technology, which realizes the reaction between fuel and oxide through the conduction of ions in the electrolyte, and directly converts chemical energy into electrical energy, replacing traditional The fuel combustion process does not need to go through the energy conversion process of fuel chemical energy→thermal energy→mechanical energy→electric energy. It is a clean and efficient all-solid-state chemical device. However, high operating temperature leads to long start-up time and difficult sealing of SOFC. At the same time, high temperature accelerates the reaction between battery components and affects battery life. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/363B23K35/40B23K1/008
CPCB23K1/008B23K35/362B23K35/40B23K2101/36
Inventor 曹健司晓庆王义峰亓钧雷张丽霞冯吉才
Owner HARBIN INST OF TECH
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