Brazing method of graphite material

A graphite material and brazing technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of limited connection strength improvement, achieve the effects of improving crack phenomenon, improving linear expansion coefficient, and reducing surface tension

Active Publication Date: 2021-02-02
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in view of the problem of residual stress caused by the brazing filler metal composition and the thermal expansion coefficient mismatch between the brazing filler metal composition and the b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0020] 1: Preparation of alloy paste: First, mix BNi75CrSiB alloy powder with a particle size of 200 μm and rare earth Y powder with alcohol, and then place it in a ball mill for ball milling. The ball milling speed is 400r / min, and the time is 16h. 0.5% of the powder mass of the alloy, and then add an organic binder to make it into a paste.

[0021] Two: Treatment of parts to be connected: first cut the graphite material into 30mm×8mm×5mm and 10mm×7mm×5mm, then sand them in turn, degrease them in the prepared solution, clean and dry them with ultrasonic acetone, and then Coat the configured alloy paste with a thickness of 500 μm on the graphite surface to form a sandwich structure filled with brazing solder between two graphite materials. Place the parts to be welded in a vacuum molybdenum furnace and heat them to 1140°C at 7°C / min , keep warm for 30min, that is, the welding parameter is to keep warm for 30min at 1140°C. After the heat preservation is over, slowly cool down ...

experiment example 2

[0024] 1: Preparation of alloy paste: First, mix BNi75CrSiB alloy powder with a particle size of 150 μm and rare earth Y powder with alcohol, and then place it in a ball mill for ball milling. The ball milling speed is 400r / min, and the time is 16h. The mass fraction of rare earth Y is BNi75CrSiB 0.25% of the powder mass of the alloy, and then add an organic binder to make it into a paste.

[0025] Two: Treatment of parts to be connected: first cut the graphite material into 30mm×8mm×5mm and 10mm×7mm×5mm, then sand them in turn, degrease them in the prepared solution, clean and dry them with ultrasonic acetone, and then Coat the configured alloy paste with a thickness of 500 μm on the graphite surface to form a sandwich structure filled with brazing solder between two graphite materials. Place the parts to be welded in a vacuum molybdenum furnace and heat them to 1140°C at 7°C / min , keep warm for 30min, that is, the welding parameter is to keep warm for 30min at 1140°C. After...

experiment example 3

[0028] 1: Preparation of alloy paste: First, add alcohol and mix BNi75CrSiB alloy powder and rare earth Y powder with a particle size of 200 μm, and then place them in a ball mill for ball milling. The ball milling speed is 400r / min, and the time is 16h. The mass fraction of rare earth Y is BNi75CrSiB 0.5% of the powder mass of the alloy, and then add an organic binder to make it into a paste.

[0029] Two: Treatment of parts to be connected: first cut graphite material and 316L stainless steel into 10mm×7mm×5mm and 30mm×8mm×5mm, then sand them in turn, remove impurities and oil in the prepared solution, and use ultrasonic acetone After cleaning and drying, the prepared alloy paste is coated with 1000 μm on the surface of the graphite to form a sandwich structure filled with the alloy paste between graphite and stainless steel, and the workpiece to be welded is placed in a vacuum molybdenum furnace at 5°C / min Heat to 1120°C and keep it warm for 40 minutes, that is, the welding...

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Abstract

The invention discloses a method for vacuum brazing connection of a graphite material by using brazing filler metal with added rare earth, belongs to the field of welding of materials, and particularly relates to a connecting method for a graphite material or between a metal material and the graphite material. Firstly, BNi75CrSiB nickel-based brazing filler metal and rare earth Y powder are evenlymixed through a ball-milling method, paste brazing filler metal is prepared through an organic adhesive, related base metal is coated with the paste brazing filler metal to form a base metal/brazingfiller metal/base metal sandwich structure, then the base metal/brazing filler metal/base metal sandwich structure is placed in a vacuum molybdenum sheet furnace, and brazing is conducted. By means ofthe method, the problems that the two-phase thermal expansion coefficient difference is too large, the wettability of brazing filler metal is poor, and the joint performance is poor due to large deformation at the local position of a joint are effectively solved, and related welding of the graphite material is economically and effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of graphite material welding, and relates to a connection method for graphite material itself and other metal materials, which uses rare earth-added solder to connect welded parts. Background technique [0002] Graphite material has excellent corrosion resistance, ablation resistance, high thermal conductivity, and good chemical stability. It has important engineering significance in the fields of aerospace, aviation, military, chemical and nuclear energy, and has extensive practice in high temperature fields. application. When graphite is used in engineering applications, it needs to be processed into complex large parts, and it must encounter welding problems, including welding itself and welding with other materials. However, due to the high melting point of graphite materials, it is impossible to directly connect them by fusion welding. Therefore, using the brazing method is suitable for welding graphi...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20
CPCB23K1/008B23K1/20B23K1/206
Inventor 吴靓朱嵘胡忠淇肖逸锋张乾坤钱锦文李淳
Owner XIANGTAN UNIV
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