A Diffusion Bonding Method of Tungsten and Low-Activation Steel

A low-activation steel and diffusion bonding technology, which is applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of reducing the thermal fatigue resistance of the interface, increasing the thickness of the reaction layer, reducing the joint strength and plasticity, etc. , to achieve excellent thermal fatigue resistance, inhibition of initiation and expansion, and high connection strength

Active Publication Date: 2022-03-22
SOUTHWESTERN INST OF PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the tungsten / low activation steel joints with certain connection strength and plasticity have been obtained by using these four intermediate layers, but there are still shortcomings: the intermediate layer reacts with the base metal during the diffusion process to form a brittle reaction layer
The reaction layer is usually a hard and brittle phase, and the base material tungsten and low-activation steel also have high strength, so the thermal stress between the reaction layer and the base material is difficult to be released, and cracks are easy to initiate and propagate from here, which will reduce Joint connection strength and plasticity, especially will reduce the thermal fatigue resistance of the interface
In addition, during the post-weld heat treatment of the joints and the high-temperature operation of the fusion reactor, the thickness of the reaction layer will further increase, and the connection performance of the joints will further decrease

Method used

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  • A Diffusion Bonding Method of Tungsten and Low-Activation Steel
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  • A Diffusion Bonding Method of Tungsten and Low-Activation Steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 Preparation of tungsten / vanadium / iron / low activation steel joint

[0036] 1) Process pure tungsten, pure vanadium, pure iron and low activation steel into sizes of 30mm×30mm×3mm, 30mm×30mm×0.5mm, 30mm×30mm×0.3mm and 30mm×30mm×30mm respectively;

[0037] 2) Carry out vacuum softening annealing treatment on pure vanadium foil and pure iron foil. -3 Pa;

[0038] 3) Use SiC sandpaper to polish the surface of pure tungsten, low-activation steel, pure vanadium and pure iron to be welded brightly, and the surface roughness Ra≤3.2μm;

[0039] 4) pickling the surfaces to be welded of pure tungsten, low-activation steel, pure vanadium foil and pure iron foil with dilute hydrochloric acid with a volume fraction of 5%, to remove residual oxides on the surface;

[0040] 5) Put the pickled pure tungsten, low-activation steel, pure vanadium foil and pure iron foil into acetone and alcohol for ultrasonic cleaning, respectively, for 20 minutes;

[0041] 6) Put the cleane...

Embodiment 2

[0045] Embodiment 2 Preparation of tungsten / titanium / iron / low activation steel joint

[0046]1) Process pure tungsten, pure titanium, pure iron and low activation steel into sizes of 30mm×30mm×3mm, 30mm×30mm×0.1mm, 30mm×30mm×0.4mm and 30mm×30mm×30mm respectively;

[0047] 2) Carry out vacuum softening annealing treatment on pure titanium foil and pure iron foil. -3 Pa;

[0048] 3) Use SiC sandpaper to polish the surface of pure tungsten, low-activation steel, pure titanium and pure iron to be welded brightly, and the surface roughness Ra≤3.2μm;

[0049] 4) pickling the surface to be welded of pure tungsten, low-activation steel, pure titanium foil and pure iron foil with dilute hydrochloric acid with a volume fraction of 5%, to remove residual oxides on the surface;

[0050] 5) Put the pickled pure tungsten, low-activation steel, pure titanium foil and pure iron foil into acetone and alcohol in sequence for ultrasonic cleaning, respectively, for 20 minutes;

[0051] 6) Put ...

Embodiment 3

[0054] Embodiment 3 Preparation of tungsten / vanadium / iron / low activation steel joint

[0055] 1) Process pure tungsten, pure vanadium, pure iron and low activation steel into sizes of 30mm×30mm×3mm, 30mm×30mm×0.3mm, 30mm×30mm×0.5mm and 30mm×30mm×30mm respectively;

[0056] 2) Carry out vacuum softening annealing treatment on pure vanadium foil and pure iron foil. -3 Pa;

[0057] 3) Use SiC sandpaper to polish the surface of pure tungsten, low-activation steel, pure vanadium and pure iron to be welded brightly, and the surface roughness Ra≤3.2μm;

[0058] 4) pickling the surfaces to be welded of pure tungsten, low-activation steel, pure vanadium foil and pure iron foil with dilute hydrochloric acid with a volume fraction of 5%, to remove residual oxides on the surface;

[0059] 5) Put the pickled pure tungsten, low-activation steel, pure vanadium foil and pure iron foil into acetone and alcohol for ultrasonic cleaning, respectively, for 20 minutes;

[0060] 6) Put the cleane...

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Abstract

The invention belongs to the field of metal diffusion welding, and in particular relates to a diffusion connection method of tungsten and low-activation steel. The structure of vanadium (or titanium)/iron/low activation steel is combined, and vacuum hot pressing or hot isostatic pressing is used for diffusion bonding of the combination. The temperature of diffusion bonding is controlled at 700‑1000℃, and the time of diffusion bonding is controlled at 0.5‑4 Hour. The invention controls the brittle reaction layer between the soft intermediate layers, forming a hard/soft/hard/soft/hard interface structure, and the interface stress can be fully released through the plastic deformation or viscoplastic deformation of the soft intermediate layer. , which inhibits the initiation and propagation of cracks in the brittle tungsten and reactive layers, resulting in the as-prepared tungsten/low activation steel joints with high connection strength, good plasticity and excellent thermal fatigue resistance.

Description

technical field [0001] The invention belongs to the field of metal diffusion welding, and in particular relates to a diffusion bonding method of tungsten and low-activation steel. Background technique [0002] The plasma-facing component is one of the most critical components in a thermonuclear fusion reactor. It directly faces the high-temperature plasma of hundreds of millions of degrees, and needs to withstand extremely high thermal load and high-energy fusion neutron irradiation, so it must have good Excellent thermal fatigue resistance and neutron radiation resistance. Plasma-facing components typically consist of a plasma-facing material and a structural material (or heat sink material). Tungsten and its alloys have the advantages of high melting point, high thermal conductivity, low vapor pressure, and low sputter corrosion rate, and are considered to be the most likely plasma-facing materials to be fully used in future tokamak fusion reactors; low-activation ferrite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/00B23K20/24B23K20/227B23K20/16B23K103/18
CPCB23K20/001B23K20/24B23K20/227B23K20/16B23K2103/18
Inventor 谌继明黄攀王一鸣王平怀周毅陈艳宇韦郑兴李前杨波
Owner SOUTHWESTERN INST OF PHYSICS
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