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Process adopting hydrogenated metal for diffusion bonding of tungsten and steel of fusion reactor material

A metal diffusion and fusion reactor technology, applied in metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problem of high yield strength of titanium metal, achieve the effect of reducing yield strength, lowering welding temperature, and facilitating stress release

Active Publication Date: 2018-11-13
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0015] The present invention aims to solve the problems that commonly used pure metal transition layers such as nickel and copper cannot be used in fusion reactor components as low activation materials in the prior art; titanium, vanadium, etc. are easy to form brittle reaction products with steel, and the yield strength of titanium metal is relatively high.

Method used

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  • Process adopting hydrogenated metal for diffusion bonding of tungsten and steel of fusion reactor material
  • Process adopting hydrogenated metal for diffusion bonding of tungsten and steel of fusion reactor material
  • Process adopting hydrogenated metal for diffusion bonding of tungsten and steel of fusion reactor material

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Embodiment Construction

[0038] Taking the China Fusion Engineering Test Reactor (CFETR) water-cooled ceramic cladding (WCCB) first wall (FW), tungsten and low-activation steel vacuum thermocompression welding as an example for further explanation.

[0039] Such as figure 1 and figure 2 As shown, a manufacturing process suitable for the connection between tungsten and steel of the first wall part of the fusion reactor, the process steps are:

[0040] 1) Machining the tungsten sheet 1 required for vacuum thermocompression welding, the steel block 2 and the transition layer metal pure titanium sheet 3 to be hydrogenated, such as figure 1 shown. The surface roughness of the surface to be welded was finely ground to ≤ Ra 0.8 μm, and the sample was placed in an acetone solution at 35°C for 30 minutes to remove surface grease and dirt. After taking it out, it was vacuum-packed for use.

[0041] 2) Vacuum annealing treatment is carried out on the processed titanium sheet 3, and the vacuum degree is less ...

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Abstract

The invention discloses a process adopting hydrogenated metal for diffusion bonding of tungsten and steel of fusion reactor material. The process has the beneficial effects that pure titanium (vanadium) hydrogenated in advance and the alloy thereof are used as a transition layer material, so that the welding temperature can be lowered, and a reaction product generated between the transition layerand the steel can be reduced; the yield strength of the transition layer is reduced, and the slow-release stress is facilitated; the low activation requirement of a fusion reactor on the material is met, so that the phenomenon that the connection quality is weakened due to the fact that the intermediate layer material and the steel generate brittle reaction products is reduced; and the process isa tungsten / steel connection process capable of improving the high-temperature slow-release residual stress capability of the middle layer material.

Description

technical field [0001] The invention relates to a technique for joining fusion reactor materials tungsten and steel by using hydrogen-containing metal diffusion, belonging to the field of metal diffusion welding. Background technique [0002] The first wall components of the China Fusion Engineering Test Reactor (CFETR) and various foreign demonstration reactors (DEMO) are in a hydrogen isotope environment, and will withstand the 14MeV neutrons and other high-energy components generated by the reaction of deuterium (D) + tritium (T) Particles are irradiated, so the first wall components are mostly designed to connect plasma-facing materials (eg tungsten) and structural materials (eg low-activation ferritic / martensitic steels). However, tungsten and steel are two kinds of dissimilar metal materials with large differences in thermophysical properties. Not only the difference in linear expansion coefficient between the two is large, it will generate large thermal stress, and at...

Claims

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Application Information

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IPC IPC(8): B23K20/02B23K20/24B23K103/18
CPCB23K20/02B23K20/24
Inventor 王纪超罗广南刘松林黄建军王万景李强谢春意
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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