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Diffusion bonding method of ternary layered ceramic titanium-silicon-carbon and solid solution thereof and ferritic stainless steel based on Ni foil intermediate layer

A ternary layered, diffusion-connected technology, used in solid electrolyte fuel cells, electrical components, fuel cell components, etc., can solve the problem of long-term stability of the coating that needs to be investigated, and achieve high practical value and anti-oxidation performance. Excellent, low junction temperature effect

Active Publication Date: 2021-01-12
OCEAN UNIV OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Aiming at the problem of Cr volatilization, there are currently two main solutions at home and abroad. One is to develop a new type of low-Cr alloy to form a double-layer structure oxide film on the surface of the alloy after oxidation , the outer layer is a non-Cr2O3 layer, the inner layer is a continuous Cr2O3 layer, the outer The dense non-Cr2O3 layer can block the volatilization of Cr compounds to a certain extent, but the volatilization problem still exists, and the long-term performance of the connector still needs further improvement
Another solution is to prepare a protective coating on the surface of the alloy, but the long-term stability of the coating needs to be investigated

Method used

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  • Diffusion bonding method of ternary layered ceramic titanium-silicon-carbon and solid solution thereof and ferritic stainless steel based on Ni foil intermediate layer
  • Diffusion bonding method of ternary layered ceramic titanium-silicon-carbon and solid solution thereof and ferritic stainless steel based on Ni foil intermediate layer

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Experimental program
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Effect test

Embodiment 1

[0028] Will (Ti,Nb) 3 SiC 2Wire cutting for ceramics and Crofer22APU stainless steel, respectively cut into 10*10*2mm 3 The size of the size, then (Ti, Nb) 3 SiC 2 The surface to be connected of ceramics and Crofer22APU stainless steel is polished step by step with 400#, 600#, 800#, 1000#, 1200#, 1500#, 2000# metallographic sandpaper, and then polished with diamond abrasive paste with a particle size of 1 μm. 30μm Ni foil, the Ni foil is ultrasonically cleaned and dried for later use. Put the above-mentioned surface-treated materials into the pre-treatment machine, and put them on the horizontal platform according to (Ti, Nb) 3 SiC 2 The order of ceramic / Ni foil / Crofer22APU stainless steel is arranged, and then the welding torch is used on (Ti,Nb) 3 SiC 2 Platinum wires were welded on the 2mm side edges of ceramic and Crofer22APU stainless steel metal blocks. Fix the welded sample in the vacuum chamber of the thermal simulation testing machine, when the vacuum degree r...

Embodiment 2

[0030] Ti 3 SiC 2 Ceramic and Ebrite stainless steel are cut into 10*10*2mm respectively 3 size, and then Ti 3 SiC 2 The surface to be connected of ceramics and Ebrite stainless steel is polished step by step with 400#, 600#, 800#, 1000#, 1200#, 1500#, 2000# metallographic sandpaper, and then polished with diamond abrasive paste with a particle size of 1 μm; the thickness is selected to be 50μm Ni foil, the Ni foil was ultrasonically cleaned and dried, and set aside. Put the above-mentioned surface-treated materials into the pre-treatment machine, and place them on the horizontal platform according to Ti 3 SiC 2 Sequential arrangement of ceramic / Ni foil / Ebrite stainless steel, and then welding torch on Ti 3 SiC 2 Platinum wires were welded to the 2 mm side edges of ceramic and Ebrite stainless steel metal blocks. Fix the welded sample in the vacuum chamber of the thermal simulation testing machine, when the vacuum degree reaches 5×10 -3 Start heating at Pa, keep const...

Embodiment 3

[0032] Ti 3 SiC 2 Ceramic and SUS430 stainless steel are cut into 10*10*2mm respectively 3 size, and then Ti 3 SiC 2 The surface to be connected of ceramics and SUS430 stainless steel is polished step by step with 400#, 600#, 800#, 1000#, 1200#, 1500#, 2000# metallographic sandpaper, and then polished with diamond abrasive paste with a particle size of 1 μm; the thickness is selected to be 10μm Ni foil, the Ni foil was ultrasonically cleaned and dried, and set aside. Put the above-mentioned surface-treated materials into the pre-treatment machine, and place them on the horizontal platform according to Ti 3 SiC 2 The order of ceramic / Ni foil / SUS430 stainless steel is arranged, and then the Ti 3 SiC 2 Platinum wire is welded on the 2mm side of the ceramic and SUS430 stainless steel metal block. Fix the welded sample in the vacuum chamber of the thermal simulation testing machine, when the vacuum degree reaches 5×10 -3 Start heating at Pa, keep constant pressure for 30mi...

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Abstract

The invention relates to a diffusion bonding method of ternary layered ceramic titanium-silicon-carbon and solid solution thereof and ferritic stainless steel based on a Ni foil intermediate layer. The method comprises the following steps: gradually polishing the to-be-bonded surfaces of ternary layered ceramic and ferritic stainless steel by using metallographic abrasive paper, and polishing by using diamond abrasive paste; cleaning the Ni foil to remove impurities such as oil stains on the surface; arranging according to the sequence of ternary layered ceramic / Ni foil / ferritic stainless steel, welding a temperature measuring platinum wire on the side surface of the sample, and carrying out diffusion bonding on the welded sample; and after the connection experiment is completed, performing cooling and pressure relief to obtain the diffusion connection joint. The joint obtained by adopting the method provided by the invention is good in interface bonding, low in connection temperatureand good in use performance and mechanical property, a continuous reaction layer is generated on the interface, welding defects such as cracks and air holes are avoided, the problem of Cr volatilization of an alloy connector can be solved, and the preparation and processing cost of a ceramic connector is reduced; and the application range of the ternary layered ceramic Ti3SiC2 and the solid solution material thereof is expanded.

Description

technical field [0001] The invention belongs to the technical field of ceramic connections and solid oxide fuel cell connections, and in particular relates to a diffusion connection method of ternary layered ceramic titanium silicon carbon and its solid solution based on a Ni foil intermediate layer and ferritic stainless steel. Background technique [0002] Solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) is a third-generation fuel cell, which is an all-solid-state device that directly converts chemical energy stored in fuel and oxidant into electrical energy in an efficient and environmentally friendly manner at medium and high temperatures. Chemical power plant. The connecting body is one of the key components of the plate-type solid oxide fuel cell SOFC stack. Its function is to electrically connect the battery cells, separate and distribute the fuel gas of the anode and the oxidant gas of the cathode. [0003] Titanium silicide (Ti 3 SiC 2 ) is a new type of terna...

Claims

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Application Information

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IPC IPC(8): C04B37/02H01M8/02H01M8/12
CPCC04B37/023H01M8/02H01M8/12H01M2008/1293C04B2237/123C04B2237/36C04B2237/406C04B2237/52Y02P70/50
Inventor 时婧程强徐斌孙明月郑莉莉李希超张洪信戴作强张铁柱
Owner OCEAN UNIV OF CHINA
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