A kind of method for graphene sponge barrier layer to enhance anti-reduction performance of brazed joint

A graphene sponge and brazing joint technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as restoration failure, and achieve the effect of prolonging service life, simple and effective operation, and prolonging service life.

Active Publication Date: 2022-08-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that the brazed joint of the existing metal support body / ceramic cell is reduced and becomes invalid during high-temperature service, and provides a method for enhancing the anti-reduction performance of the brazed joint with a graphene sponge barrier layer

Method used

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  • A kind of method for graphene sponge barrier layer to enhance anti-reduction performance of brazed joint
  • A kind of method for graphene sponge barrier layer to enhance anti-reduction performance of brazed joint
  • A kind of method for graphene sponge barrier layer to enhance anti-reduction performance of brazed joint

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specific Embodiment approach 1

[0018] Embodiment 1: The method for enhancing the anti-reduction performance of the brazed joint by the graphene sponge barrier layer of the present embodiment is specifically implemented according to the following steps:

[0019] 1. Cut the graphene sponge into thin slices along the direction parallel to the cross section to obtain the graphene sponge barrier layer;

[0020] 2. Configure the noble metal-oxide solder with an oxide mole fraction of 0.1-20 mol.%, and then press the solder into a solder sheet;

[0021] 3. Grind the to-be-welded surfaces of the metals to be welded and the ceramics to be welded respectively, and then put the metals to be welded and the ceramics to be welded into anhydrous ethanol for ultrasonic cleaning to obtain the cleaned ceramics to be welded and the metals to be welded;

[0022] Fourth, stack the cleaned metal to be welded, the first brazing filler metal sheet, the graphene sponge barrier layer, the second brazing filler metal sheet and the cl...

specific Embodiment approach 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the thickness of the graphene sponge barrier layer described in Step 1 is 0.2-8 mm.

specific Embodiment approach 3

[0026] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the precious metal-oxide solder described in step 2 is Ag-CuO system solder, Ag-V 2 O 5 System solder, Ag-Nb 2 O 5 System solder, Ag-SiO 2 System solder, Ag-TeO 2 System solder, Pt-CuO system solder or Pt-Nb 2 O 5 System solder.

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Abstract

A method for enhancing the anti-reduction performance of a brazed joint by a graphene sponge barrier layer, the invention belongs to the field of metal and ceramic connection, and aims to solve the problem that the brazed joint of an existing metal support body / ceramic cell is reduced during high-temperature service. failure problem. Brazing method: 1. The graphene sponge is cut into thin slices; 2. Precious metal-oxide brazing filler metal is configured and pressed into sheets; 3. The metal to be welded and the ceramic to be welded are polished; 4. The parts to be welded are assembled; 2~8×10 ‑3 Pa, the brazing temperature is 960 ~ 1200 ℃ to carry out the brazing connection. In the present invention, a graphene sponge barrier layer is introduced in the brazing process. On the one hand, the introduction of graphene breaks the continuous grain boundary in the brazing joint and reduces the rate of intergranular diffusion of hydrogen; on the other hand, graphene absorbs hydrogen and binds and penetrates into The hydrogen in the joint, thereby inhibiting the reaction of hydrogen with oxides and oxygen in the joint, makes the anti-reduction performance of the joint significantly enhanced.

Description

technical field [0001] The invention belongs to the field of metal and ceramic connection, and particularly relates to a method for enhancing the anti-reduction performance of a brazed joint by a graphene sponge barrier layer. Background technique [0002] Solid fuel cell is a clean and efficient solid-state electrochemical energy conversion system, which has the advantages of low cost, low pollution, high energy conversion rate and low noise, and has been widely used in many fields. Solid fuel cells are usually in service at 600-800 °C, and metal supports need to be connected to ceramic cell sheets to separate oxidizing gas and fuel gas, which puts forward higher resistance to reduction and oxidation resistance of joints at high temperatures. Require. [0003] Air reactive brazing (RAB) is the most common method for connecting metal supports and ceramic cells. This method uses a noble metal-oxide system to braze metals and ceramics in air, and the obtained joints have good...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20B23K103/00
CPCB23K1/19B23K1/20B23K1/008B23K2103/50B23K2103/52
Inventor 司晓庆王晓阳曹健李淳亓钧雷冯吉才
Owner HARBIN INST OF TECH
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