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A fast connection method of electron beam brazing of tungsten/copper

A fast connection and electron beam technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of CuCrZr alloy grain growth, copper alloy grain cannot be weakened, and mechanical properties decline, etc., to achieve simple process , good combination performance and thermal load performance, and the effect of restoring mechanical properties

Active Publication Date: 2017-02-22
SOUTHWESTERN INST OF PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vacuum brazing process is simple and can greatly reduce the cost. It is currently the most widely used W / CuCrZr connection technology. Vacuum brazing needs to heat the block as a whole, and needs to stay at high temperature for a long time, which will lead to CuCrZr alloy crystals. Grain growth and mechanical properties decrease, and the mechanical properties of CuCrZr alloy can be recovered by rapid cooling; but due to the long brazing time, the copper alloy grain growth cannot be weakened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Industrial pure tungsten is connected with CuCrZr alloy, and the sample size is 40×40×6mm 3 and 40×40×25mm 3 , the connection process is as follows:

[0023] (1) Pretreatment of pure tungsten and CuCrZr alloy surface to be welded to remove impurities, oil stains and oxide film on the surface. Use No. 320, No. 600, No. 800 and No. 1200 sandpaper to grind the surface of the specimen to be welded step by step, then degrease the surface to be welded with acetone, ultrasonically clean with anhydrous ethanol, and dehydrate and dry. Select CuMn alloy as the solder: Cu content 74wt.%, Mn content 25wt.%, Ni content 1%, thickness 150 μm; use 1200 mesh sandpaper to polish the surface of the solder, remove the oxide film, then ultrasonically clean with absolute ethanol, dehydrate and dry .

[0024] (2) Assemble the tungsten and copper alloy, the tungsten block is on the top, the solder is spread in the middle, and the copper alloy block is on the bottom; then it is fixed on the ...

Embodiment 2

[0027] The pure tungsten with 1mm oxygen-free pure copper on the surface is connected with CuCrZr alloy, and the sample size is 50×25×6mm 3 and 50×25×25mm 3 , the connection process is as follows:

[0028] (1) The surface is pretreated by casting 1mm oxygen-free pure copper pure tungsten and CuCrZr alloy on the surface to be welded to remove impurities, oil stains and oxide films on the surface. Use No. 320, No. 600, No. 800 and No. 1200 sandpaper to grind the surface of the test piece to be welded step by step, and then use acetone to degrease the surface to be welded, ultrasonically clean it with absolute ethanol, and dehydrate and dry. Among them, the pure copper surface of the tungsten base material is the surface to be welded. Select CuTi alloy as the brazing material with a Cu content of 47wt.%, a Ti content of 33wt.%, a Zr content of 11%, a Ni content of 8%, a Si content of 1%, and a thickness of 100 μm; use 1200 mesh sandpaper to polish the surface of the solder to r...

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Abstract

The invention belongs to a quick connection method for tungsten / copper in an electron beam braze welding manner. The quick connection method is achieved through the following steps that surface pretreatment is conducted on parent metal and brazing filler metal, and oil stain, impurities and oxidation films on the surfaces to be welded are removed; the brazing filler metal is placed between the parent metal, fixed through a fixture and placed in an electron beam device, parameters are set, and brazing is conducted; the temperature of the surface of tungsten is monitored through a thermal infrared imager and an infrared thermometer; the block temperature of Cu alloy is monitored through a thermocouple; when brazing is completed, the Cu alloy block is quickly cooled to the room temperature, and a brazing sample is taken out and placed into a vacuum annealing furnace to be subjected to annealing treatment. According to the quick connection method, materials to be brazed are scanned through a defocused electron beam, local heating is achieved, and quick cooling is conducted after brazing is completed; and in the whole process, the time when the copper alloy stays higher than 600 DEG C is less than or equal to 5 minutes, and therefore the problems that copper alloy grains grow and performance is lowered can be effectively solved.

Description

technical field [0001] The invention belongs to a tungsten-copper connection method, in particular to a method for quickly connecting tungsten and copper alloys by using a copper-based foil strip as a solder and using vacuum electron beam brazing technology. Background technique [0002] Plasma-facing components will directly face the high-temperature plasma in the fusion device, and the location includes the first wall of the fusion device and the divertor, so it involves high thermal load performance, sputter corrosion, impurity control, hydrogen isotope and helium retention and Recycling, neutron irradiation effects and other important issues. Conventional tokamak devices are mainly designed based on the concept of short-pulse plasma and slow heat removal between discharges, which allows simple design solutions without fast interconnection of plasma-facing materials and heat-sink materials. The long-pulse device requires active heat removal during the plasma discharge pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/005B23K1/20
Inventor 练友运刘翔封范程正奎王金谌继明
Owner SOUTHWESTERN INST OF PHYSICS
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