Solid target slice for spallation neutron source and preparing method of solid target slice

Abstract

The invention provides a solid target slice for a spallation neutron source and a preparing method of the solid target slice to enhance the connecting strength of tantalum and tungsten in the target slice and prolong the service life of the target slice. The preparing method of the solid target slice for the spallation neutron source comprises the steps that a tungsten block and a tantalum plate which are to be welded are washed; the tantalum plate is tightly attached to the six faces of the tungsten block so that a tantalum box containing the tungsten block can be formed; the tantalum box is sealed and welded; the tantalum box which is sealed and welded is placed into a hot isostatic pressing furnace to be pressured in a hot isostatic mode and then is taken out, and then the target slice is obtained. According to the preparing method of the solid target piece for the spallation neutron source, other transition metal is not introduced, the tantalum plate and the tungsten block are directly connected in a diffusion mode on a large area, metallurgical bonding can be achieved between the tantalum and the tungsten in the manufactured target slice, the bonding strength is high, a tantalum coating is compact, the erosion corrosion resisting performance of the target slice is enhanced, and the service life of the target slice is prolonged.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a solid target for a spallation neutron source and a preparation method thereof. Background technique [0002] The China Spallation Neutron Source uses metal tungsten as the target material. When high-energy protons bombard the tungsten block to generate neutrons, a large amount of heat will be generated. In order to operate efficiently and stably, the tungsten target needs to be cooled. However, under strong irradiation and water flow, the tungsten block will crack, which will affect the life of the tungsten target. In order to enhance the erosion corrosion resistance of the tungsten target, it is necessary to coat the six sides of the tungsten block with a layer of metal tantalum with strong corrosion resistance and high atomic number. [0003] Since both tantalum and tungsten are metals with high melting points, and the welding of tungsten block and tantalum plate invol...

AI Technical Summary

Problems solved by technology

[0003] Since tantalum and tungsten are metals with high melting points, and the welding between tungsten block and tantalum plate involves surface-to-surface welding, which increases the difficulty of welding, and conventional welding cannot meet the requirements.

[0004] The existing tungsten-tantalum welding method is to pass a transition metal, such as nickel alloy, between the tungsten block and the tantalum plate, and use brazing to weld, but this welding method requires the introduction of transition alloys

There is also a method of plasma spraying tantalum on the surface of tungsten block, but the obtained tantalum coating is not dense enough, and the connection strength between tantalum coating and tungsten is not high.

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