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Vacuum brazing connection technology for tungsten copper composite block

A composite block and brazing technology, applied in the direction of welding medium, welding equipment, welding/welding/cutting items, etc., to achieve the effect of improving bonding performance, good wettability, and good bonding performance

Active Publication Date: 2014-03-26
SOUTHWESTERN INST OF PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a direct connection process between tungsten and copper for the existing connection technology of tungsten-copper composite blocks used in high heat load components, so that the brazing filler metal can be connected with tungsten and copper under vacuum conditions. Complex physical and chemical reactions between copper to realize the connection between tungsten and copper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Vacuum brazing of tungsten and chrome-zirconium copper alloy butt joints, tungsten is industrially produced pure tungsten, size 20mm×20mm, thickness 5mm; chrome-zirconium copper alloy size is 20mm×20mm, thickness 10mm. The brazing process steps are:

[0035] (1) Pretreatment of the welding surface of pure tungsten and chromium-zirconium-copper alloy to remove impurities, oil stains and oxide films on the surface: put pure tungsten and chromium-zirconium-copper alloy into acetone solution for ultrasonic cleaning for 10 minutes, and dry with hot air; use 320 No., No. 600, No. 800 and No. 1200 sandpaper to polish and polish the welding surface. The ratio is 65% nitric acid: 40% hydrofluoric acid = 4:1 solution to clean the tungsten surface for 3 minutes; 20% dilute nitric acid solution to clean the copper alloy surface for 5 minutes minute. Then deionized water, alcohol ultrasonic cleaning; finally dehydration and drying.

[0036] (2) Cleaning of thin strip copper-based ...

Embodiment 2

[0041] Vacuum brazing of tungsten and chrome-zirconium copper alloy butt joints, tungsten W-TiC, size 30mm×30mm, thickness 8mm; chrome-zirconium copper alloy size 30mm×30mm, thickness 20mm. The brazing process steps are:

[0042] (1) Welding surface pretreatment of pure tungsten and chromium-zirconium-copper alloy: put W-TiC and chromium-zirconium-copper alloy into acetone solution for ultrasonic cleaning for 10 minutes, and dry with hot air; use No. 320, No. 600, No. 800 and No. 1200 Grinding and polishing the welding surface with sandpaper; then ultrasonic cleaning with deionized water and alcohol, and finally dehydration and drying.

[0043] (2) Cleaning of thin strip copper-based solder: ultrasonically clean a thin strip of copper-based solder with a thickness of 150 μm of Cu 71%-Mn 26%-Ti 3% (the chemical composition is the mass fraction) in acetone for 10 minutes; Surface oxide layer; then alcohol ultrasonic cleaning, drying for later use.

[0044] (3) Place the pretre...

Embodiment 3

[0048] Vacuum brazing of butt joints between tungsten and chrome-zirconium copper alloy, tungsten is W-1%La 2 o 3 (mass fraction) alloy, size 40mm×40mm, thickness 10mm; chrome-zirconium copper alloy size 40mm×40mm, thickness 30mm. The brazing process steps are:

[0049] (1) Welding surface pretreatment of pure tungsten and chromium-zirconium copper alloy: W-1%La 2 o 3 Alloys and chromium-zirconium-copper alloys were ultrasonically cleaned in acetone solution for 10 minutes, and dried with hot air; the welding surface was polished with No. 320, No. 600, No. 800 and No. 1200 sandpaper; the ratio was 65% nitric acid: 40% hydrofluoric acid = Clean the surface of tungsten with 4:1 solution for 5 minutes; clean the surface of copper alloy with 20% dilute nitric acid solution for 10 minutes; then clean with ultrasonic deionized water and alcohol, and finally dehydrate and dry.

[0050] (2) Thin strip copper-based solder cleaning: Ultrasonic the thin strip solder acetone with a th...

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Abstract

The invention belongs to the technical field of heterogeneous material welding, and particularly relates to a method for vacuum brazing connection of tungsten and copper. The method is applied to connection of a tungsten copper composite block of a high-heating-load component of a fusion device. The method comprises the following steps that (1) brazing connection materials and brazing filter metal are determined; (2) a welding surface is preprocessed, a tungsten block and a chromium-zirconium-copper alloy block are cleaned, impurities, oil contamination and an oxidation film of the welding surface are removed, and dewatering and drying are conducted; (3) the ribbon copper-based brazing filter metal is cleaned; (4) assembly is conducted, connection is conducted in a butt-joint mode, the copper-based brazing filter metal is placed between the preprocessed surface to be welded of the tungsten and the preprocessed surface to be welded of copper alloy, assembly is conducted through a clamp and the pressure of 0.01MPa-0.1MPa is perpendicularly exerted; (5) welding is conducted, the assembled tungsten block-ribbon copper-based brazing filter metal-chromium copper alloy welding piece is placed in a vacuum brazing device for welding. According to the technical scheme, the obtained pure tungsten and the chromium-zirconium-copper alloy are welded in a butt joint mode, welding-seam forming is good, deformation of the welding piece is avoided, and shortages of microscopic cracks, air holes and impurities and the like are avoided.

Description

technical field [0001] The invention belongs to the technical field of welding of heterogeneous materials, and is applied to the connection of tungsten-copper composite blocks of high thermal load parts of fusion devices, in particular to a vacuum brazing connection method of tungsten and copper. Background technique [0002] Tungsten is widely considered to be the most promising nuclear fusion device due to its advantages such as high melting point, excellent thermal conductivity, low sputtering yield and high self-sputtering threshold, low vapor pressure and low tritium retention performance. body material. The tungsten-copper composite block formed by connecting tungsten and heat sink material copper is the basic unit of the plasma-facing component. The biggest problem in the connection between tungsten and heat sink material copper is that there is a large difference in thermal expansion coefficient and elastic modulus between tungsten and copper, which in turn produces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/19B23K1/008B23K1/20B23K35/30
CPCB23K1/008B23K1/19B23K1/20B23K1/206B23K35/302B23K2103/18
Inventor 刘翔练友运
Owner SOUTHWESTERN INST OF PHYSICS
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