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A method to join ceramics to metals in air using solid silver

A ceramic and metal technology, used in metal processing equipment, welding equipment, welding media, etc., can solve the problems of poor high temperature anti-reduction and anti-oxidation performance, and achieve high-temperature anti-oxidation and anti-reduction performance. Reduce oxidation and welding temperature low effect

Active Publication Date: 2022-03-25
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 of poor high-temperature reduction and oxidation resistance of existing metal / ceramic brazing joints, and provides a method for connecting ceramics and metals in air using solid silver

Method used

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  • A method to join ceramics to metals in air using solid silver
  • A method to join ceramics to metals in air using solid silver
  • A method to join ceramics to metals in air using solid silver

Examples

Experimental program
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specific Embodiment approach 1

[0023] Specific Embodiment 1: In this embodiment, the method of using solid silver to connect ceramics and metals in the air is implemented according to the following steps:

[0024] 1. Press the silver powder into silver flakes;

[0025] 2. Polish the surface to be welded of the metal to be welded with sandpaper, and polish the ceramic to be welded with a diamond grinding disc, and then put it into anhydrous ethanol for ultrasonic cleaning to obtain the cleaned ceramics to be welded and the metal to be welded;

[0026] 3. Stack the cleaned metal to be welded, the silver sheet and the cleaned ceramics to be welded in sequence, and apply brazing pressure to obtain the assembled piece to be welded;

[0027] 4. Place the assembled parts to be welded in a muffle furnace, perform brazing connection at a brazing temperature of 860-960°C and a holding time of 20-60 minutes, cool down to room temperature, and complete the bonding of ceramics and metals connect.

[0028] In this embo...

specific Embodiment approach 2

[0029] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, a tablet press is used to press the silver powder.

specific Embodiment approach 3

[0030] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the particle size of the silver powder in step 1 is 1-20 μm.

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Abstract

The invention relates to a method for connecting ceramics and metals in air by using solid silver. The invention belongs to the field of metal-ceramic connections, and aims to solve the problem of poor high-temperature reduction and oxidation resistance of existing metal / ceramic brazing joints. The brazing connection method of the present invention: 1. Silver powder is pressed into silver sheets; 2. Polishing and cleaning the ceramics to be welded and the metals to be welded; Put it down, and apply brazing pressure; 4. Place the assembled parts to be welded in the muffle furnace, and perform brazing connection at a brazing temperature of 860-960 ° C and a holding time of 20-60 minutes, and cool down To room temperature, complete the brazing connection of ceramics and metals. The invention uses pure silver to connect metals and ceramics, there is no dispersed oxide in the joint, and the oxide layer on the metal side is relatively thin, which enhances the high-temperature anti-oxidation and anti-reduction performance of the joint, and the welding temperature is relatively low.

Description

technical field [0001] The invention relates to the field of connecting metals and ceramics, in particular to a method for connecting ceramics and metals in air by using solid silver. Background technique [0002] Solid fuel cell is a clean and efficient electrochemical energy conversion system, which has been widely used in various fields. Usually, a higher voltage is obtained by connecting multiple batteries in series to form a battery stack. The series connection of batteries requires that the stainless steel connector be closely connected with the ceramic electrolyte to separate the oxidizing gas (air or O 2 ) and fuel gas (H 2 、CH x , CO, etc.). However, solid fuel cells usually serve at 600-1000°C, so higher requirements are placed on the high-temperature reduction and high-temperature oxidation resistance of the joints. [0003] Air reaction brazing is the most common method of connecting metal supports and ceramic cells. This method is carried out in the air, usi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20B23K35/30
CPCB23K1/008B23K1/20B23K1/206B23K35/3006B23K2103/52
Inventor 司晓庆王晓阳曹健李淳亓钧雷冯吉才
Owner HARBIN INST OF TECH