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Method for connecting graphite and stainless steel through high-temperature brazing of composite gradient intermediate layer

An intermediate layer and stainless steel technology, which is applied in the field of composite gradient intermediate layer high-temperature brazing connection between graphite and stainless steel, graphite and stainless steel, can solve the problems of thermal expansion coefficient mismatch and wettability, and achieve control of residual stress and deformation , good mechanical properties, the effect of avoiding the formation of cracks

Active Publication Date: 2021-04-09
XIANGTAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the huge thermal expansion coefficient mismatch and wettability problems when graphite and stainless steel are welded, and provides a composite gradient intermediate layer high-temperature brazing connection between graphite and stainless steel stainless steel method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Use 30 μm thick amorphous TiZrNiCu foil, 100 μm thick Ti foil, 300 μm thick Ni foil, 30 μm thick amorphous BNi-2 foil as composite gradient interlayer for brazing connection isostatic Pressed graphite and 304 stainless steel:

[0021] (1) Pretreatment: Put stainless steel and graphite Ti sheets, amorphous TiZrNiCu foils, amorphous BNi-2 foils, and Ni foils into alcohol solution after grinding with 400#, 600#, and 800# sandpaper respectively Ultrasonic cleaning was performed for 40 minutes, then cleaned with deionized water, and dried for later use.

[0022] (2) Assembly: Put amorphous TiZrNiCu foil, Ti sheet, amorphous BNi-2 foil, Ni foil, and amorphous BNi-2 foil between the graphite and the stainless steel surface to be welded in sequence to form Sandwich structure - graphite / amorphous TiZrNiCu foil / Ti sheet / amorphous BNi-2 foil / Ni foil / amorphous BNi-2 foil / stainless steel, fix the welded structure and then place it in a vacuum furnace.

[0023] (3) Brazing: The va...

Embodiment 2

[0027] Use 100 μm thick amorphous TiZrNiCu foil, 500 μm thick Ti foil, 100 μm thick Ni foil, 100 μm thick amorphous BNi-2 foil as composite gradient interlayer for brazing connection isostatic Pressed graphite and 304 stainless steel:

[0028] (1) Pretreatment: Put stainless steel and graphite Ti sheets, amorphous TiZrNiCu foils, amorphous BNi-2 foils, and Ni foils into alcohol solution after grinding with 600#, 800#, and 1000# sandpaper respectively Ultrasonic cleaning was performed for 20 minutes, then cleaned with deionized water, and dried for later use.

[0029] (2) Assembly: Put amorphous TiZrNiCu foil, Ti sheet, amorphous BNi-2 foil, Ni foil, and amorphous BNi-2 foil between the graphite and the stainless steel surface to be welded in sequence to form Sandwich structure - graphite / amorphous TiZrNiCu foil / Ti sheet / amorphous BNi-2 foil / Ni foil / amorphous BNi-2 foil / stainless steel, fix the welded structure and then place it in a vacuum furnace.

[0030] (3) Brazing: The...

Embodiment 3

[0034] Use 50 μm thick amorphous TiZrNiCu foil, 300 μm thick Ti foil, 200 μm thick Ni foil, 50 μm thick amorphous BNi-2 foil as composite gradient interlayer for brazing connection isostatic Pressed graphite and 316L stainless steel:

[0035] (1) Pretreatment: Put stainless steel and graphite Ti sheets, amorphous TiZrNiCu foils, amorphous BNi-2 foils, and Ni foils into alcohol solution after grinding with 600#, 800#, and 1500# sandpaper respectively Ultrasonic cleaning was performed for 30 minutes, then cleaned with deionized water, and dried for later use.

[0036] (2) Assembly: Put amorphous TiZrNiCu foil, Ti sheet, amorphous BNi-2 foil, Ni foil, and amorphous BNi-2 foil between the graphite and the stainless steel surface to be welded in sequence to form Sandwich structure - graphite / amorphous TiZrNiCu foil / Ti sheet / amorphous BNi-2 foil / Ni foil / amorphous BNi-2 foil / stainless steel, fix the welded structure and then place it in a vacuum furnace.

[0037] (3) Brazing: The ...

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Abstract

The invention relates to a high-temperature brazing connection method for graphite and stainless steel. The high-temperature brazing connection method for the graphite and the stainless steel comprises the steps of selecting amorphous TiZrNiCu foil brazing filler metal, a Ti foil, an amorphous BNi-2 brazing filler metal foil and an Ni foil as brazing materials; after cleaning the graphite, the stainless steel, the amorphous TiZrNiCu foil, the Ti foil, the amorphous BNi-2 foil and the Ni foil, forming a graphite / amorphous TiZrNiCu foil / Ti foil / amorphous BNi-2 foil / Ni foil / amorphous BNi-2 foil / stainless steel sandwich structure; and placing the structure in a vacuum furnace, increasing the temperature to 980 to 1080 DEG C at the speed of 5 to 8 DEG C / min, conducting heat preservation for 60 to 120 min, conducting brazing connection, and then conducting sectional heat preservation and slow cooling to the room temperature. The problems of serious mismatching and wettability of the thermal expansion coefficients of the graphite and the stainless steel are effectively solved, the thermal stress of a joint is greatly reduced, cracks are prevented from being generated in the joint area, and good connection of the graphite and the stainless steel is achieved.

Description

technical field [0001] The invention relates to the connection of graphite and stainless steel, specifically a method for connecting graphite and stainless steel by high-temperature brazing of a composite gradient intermediate layer, which belongs to the field of material connection. Background technique [0002] Graphite is a new type of high-strength material with good chemical stability at room temperature, high melting point, excellent corrosion resistance, compressive strength, high thermal conductivity, and low relative density. It is widely used in defense industry, Aerospace, energy and transportation industries. Stainless steel, especially austenitic stainless steel, has good mechanical properties and process properties, good corrosion resistance and high strength, and is a metal material widely used in petroleum, chemical, fertilizer and other industrial sectors. The connectors of graphite and stainless steel are expected to have the advantages of both, and have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20B23K3/08
CPCB23K1/008B23K1/20B23K1/206B23K3/08
Inventor 吴靓胡忠淇肖逸锋李淳钱锦文张汭陈燕
Owner XIANGTAN UNIV
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